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K9F2808Q0B-DCB0,DIB0 K9F2808U0B-VCB0,VIB0
K9F2808U0B-YCB0,YIB0 K9F2808U0B-DCB0,DIB0
FLASH MEMORY
Document Title
16M x 8 Bit NAND Flash Memory
Revision History
Revision No. History
0.0 0.1 0.2 Initial issue. K9F2808U0B(3.3V device)'s qualification is finished K9F2808Q0B (1.8V device) - Changed typical read operation current (Icc1) from 8mA to 5mA - Changed typical program operation current (Icc2) from 8mA to 5mA - Changed typical erase operation current (Icc3) from 8mA to 5mA - Changed typical program time(tPROG) from 200us to 300us - Changed ALE to RE Delay (ID read, tAR1) from 100ns to 20ns - Changed CLE hold time(tCLH) from 10ns to 15ns - Changed CE hold time(tCH) from 10ns to 15ns - Changed ALE hold time(tALH) from 10ns to 15ns - Changed Data hold time(tDH) from 10ns to 15ns - Changed CE Access time(tCEA) from 45ns to 60ns - Changed Read cycle time(tRC) from 50ns to 70ns - Changed Write Cycle time(tWC) from 50ns to 70ns - Changed RE Access time(tREA) from 35ns to 40ns - Changed RE High Hold time(tREH) from 15ns to 20ns - Changed WE High Hold time(tWH) from 15ns to 20ns 1. Device Code is changed - TBGA package information : 'B' --> 'D' ex) K9F2808Q0B-BCB0 ,BIB0 --> K9F2808Q0B-DCB0,DIB0 K9F2808U0B-BCB0 ,BIB0 --> K9F2808Q0B-DCB0,DIB0 2. VIH ,VIL of K9F2808Q0B(1.8 device) is changed (before revision) Input High Voltage Input Low Voltage, All inputs VIH I/O pins Except I/O pins VccQ-0.4 VCC-0.4 0 (after revision) I/O pins Input High Voltage VIH Except I/O pins Input Low Voltage, All inputs V IL VCC-0.4 -0.3 VccQ-0.4 VccQ +0.3 VCC +0.3 0.4 VccQ VCC 0.4
Draft Date
May 28'th 2001 Jun. 30th 2001
Remark
Advance
Jul. 30th 2001
K9F2808Q0B : Preliminary
0.3
Aug. 23th 2001
V IL
Note : For more detailed features and specifications including FAQ, please refer to Samsung's Flash web site. http://www.intl.samsungsemi.com/Memory/Flash/datasheets.html The attached datasheets are prepared and approved by SAMSUNG Electronics. SAMSUNG Electronics CO., LTD. reserve the right to change the specifications. SAMSUNG Electronics will evaluate and reply to your requests and questions about device. If you have any questions, please contact the SAMSUNG branch office near you.
1
K9F2808Q0B-DCB0,DIB0 K9F2808U0B-VCB0,VIB0
K9F2808U0B-YCB0,YIB0 K9F2808U0B-DCB0,DIB0
FLASH MEMORY
Revision History
Revision No. History
0.4 1. IOL(R/B) of 1.8V device is changed. -min. Value: 7mA -->3mA -typ. Value: 8mA -->4mA 2. AC parameter is changed. tRP(min.) : 30ns --> 25ns
Draft Date
Nov 5th 2001
Remark
Preliminary
0.5
1. Parameters are changed in 1.8V part(K9F2808Q0B) . - tCH is changed from 15ns to 20ns - tCLH is changed from 15ns to 20ns - tALH is changed from 15ns to 20ns - tDH is changed from 15ns to 20ns
Feb 15th 2002
0.6
1. Parameters are changed in 1.8V part(K9F2808Q0B) . - tRP is changed from 25ns to 35ns - tWB is changed from 100ns to 150ns - tREA is changed from 40ns to 45ns
May 3rd 2002
Note : For more detailed features and specifications including FAQ, please refer to Samsung's Flash web site. http://www.intl.samsungsemi.com/Memory/Flash/datasheets.html The attached datasheets are prepared and approved by SAMSUNG Electronics. SAMSUNG Electronics CO., LTD. reserve the right to change the specifications. SAMSUNG Electronics will evaluate and reply to your requests and questions about device. If you have any questions, please contact the SAMSUNG branch office near you.
2
K9F2808Q0B-DCB0,DIB0 K9F2808U0B-VCB0,VIB0
K9F2808U0B-YCB0,YIB0 K9F2808U0B-DCB0,DIB0
FLASH MEMORY
16M x 8 Bit Bit NAND Flash Memory
PRODUCT LIST
Part Number K9F2808Q0B-D K9F2808U0B-Y K9F2808U0B-D K9F2808U0B-V 2.7 ~ 3.6V Vcc Range 1.7 ~ 1.9V X8 Organization PKG Type TBGA TSOP1 TBGA WSOP1
FEATURES
* Voltage Supply - K9F2808Q0B : 1.7~1.9V - K9F2808U0B : 2.7 ~ 3.6 V * Organization - Memory Cell Array : (16M + 512K)bit x 8bit - Data Register : (512 + 16)bit x8bit * Automatic Program and Erase - Page Program : (512 + 16)Byte - Block Erase : (16K + 512)Byte * 528-Byte Page Read Operation - Random Access : 10s(Max.) - Serial Page Access - K9F2808Q0B : 70ns - K9F2808U0B : 50ns * Fast Write Cycle Time - Program Time - K9F2808Q0B : 300 s(Typ.) - K9F2808U0B : 200s(Typ.) - Block Erase Time : 2ms(Typ.) * Command/Address/Data Multiplexed I/O Port * Hardware Data Protection - Program/Erase Lockout During Power Transitions * Reliable CMOS Floating-Gate Technology - Endurance : 100K Program/Erase Cycles - Data Retention : 10 Years * Command Register Operation * Package - K9F2808U0B-YCB0/YIB0 : 48 - Pin TSOP I (12 x 20 / 0.5 mm pitch) - K9F2808X0B-DCB 0/ DIB0 63- Ball TBGA ( 9 x 11 /0.8mm pitch , Width 1.0 mm) - K9F2808U0B-VCB0/VIB0 48 - Pin WSOP I (12X17X0.7mm) * K9F2808U0B-V(WSOPI ) is the same device as K9F2808U0B-Y(TSOP1) except package type.
GENERAL DESCRIPTION
The K9F2808X0B is a 16M(16,777,216)x8bit NAND Flash Memory with a spare 512K(524,288)x8bit. The device is offered in 1.8V or 3.3V Vcc. Its NAND cell provides the most cost-effective solution for the solid state mass storage market. A program operation programs the 528-byte page in typical 200s and an erase operation can be performed in typical 2ms on a 16K-byte block. Data in a page can be read out at 70ns/50ns(K9F2808Q0B:70ns, K9F2808U0B:50ns) cycle time per byte. The I/O pins serve as the ports for address and data input/output as well as command input. The on-chip write control automates all program and erase functions including pulse repetition, where required, and internal verification and margining of data. Even write-intensive systems can take advantage of the K9F2808X0B' extended reliability of 100K program/erase cycles by providing ECC(Error Correcting Code) with s real time mapping-out algorithm. The K9F2808X0B is suitable for use in data memory of mobile communication system to reduce not only mount area but also power consumption.
3
K9F2808Q0B-DCB0,DIB0 K9F2808U0B-VCB0,VIB0
K9F2808U0B-YCB0,YIB0 K9F2808U0B-DCB0,DIB0
FLASH MEMORY
PIN CONFIGURATION (TSOP1)
K9F2808U0B-YCB0/YIB0
N.C N.C N.C N.C N.C GND R/B RE CE N.C N.C Vcc Vss N.C N.C CLE ALE WE WP N.C N.C N.C N.C N.C 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 N.C N.C N.C N.C I/O7 I/O6 I/O5 I/O4 N.C N.C N.C Vcc Vss N.C N.C N.C I/O3 I/O2 I/O1 I/O0 N.C N.C N.C N.C
PACKAGE DIMENSIONS
48-PIN LEAD PLASTIC THIN SMALL OUT-LINE PACKAGE TYPE(I) 48 - TSOP1 - 1220F
Unit :mm/Inch
MAX #48 ( 0 .25 ) 0.010 12 .40 MAX 0.488 #24 #25 1.000.05 0.039 0.002 0 .25 0.010 TYP
+0 .07 5
0 .00 8- 0.0 0 1
+0 .0 03
+0 .07
0.20 -0 .0 3
#1
0.50 0.0 197
12.00 0.472
0.1 25 0 .03 5
0~8 AE
0.45~0.75 0.018~0.030
( 0.50 ) 0.020
4
+0 .00 3 0.005-0 .0 01
18.400.10 0.7240.004
1.20 0.047 MAX
0.004 0.05 MIN 0.002
0.10
20.000.20 0.7870.008
K9F2808Q0B-DCB0,DIB0 K9F2808U0B-VCB0,VIB0
K9F2808U0B-YCB0,YIB0 K9F2808U0B-DCB0,DIB0
FLASH MEMORY
PIN CONFIGURATION (TBGA)
K9F2808X0B-DCB0/DIB0
D U DNU N DU N
/WP NC NC NC NC NC NC Vss ALE /RE N C N C N C I/O0 I/O1 I/O2 NC /CE /WE NC NC NC NC NC R/B NC NC NC NC Vcc I/O7 Vss
DNU DNU DNU DNU
CLE NC NC NC NC NC NC NC NC NC NC
VccQ I/O5 I/O6
I/O3 I/O4
D U DNU N D U DNU N
DNU DNU DNU DNU
PACKAGE DIMENSIONS
63-Ball TBGA (measured in millimeters) Top View
(Top View)
Bottom View
9.00 0.10 0.80 x9= 7.20 0.80 x5= 4.00 A
9.000.10
(Datum A)
6
5
0.80 4
3
2
1
B
#A1
A B 0.80 x7= 5.60
(Datum B)
0.80 C D E 2.80 F G H 0.80 x11= 8.80 0.900.10 11.000.10
63-0.45 0.05
0.20 M A B
2.00 0.320.05
Side View
9.00 0.10
0.08MAX 0.450.05
5
11.000.10
K9F2808Q0B-DCB0,DIB0 K9F2808U0B-VCB0,VIB0
K9F2808U0B-YCB0,YIB0 K9F2808U0B-DCB0,DIB0
FLASH MEMORY
PIN CONFIGURATION (WSOP1)
K9F2808U0B-VCB0/VIB0
N.C N.C DNU N.C N.C N.C R/B RE CE DNU N.C Vcc Vss N.C DNU CLE ALE WE WP N.C N.C DNU N.C N.C 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 N.C N.C DNU N.C I/O7 I/O6 I/O5 I/O4 N.C DNU N.C Vcc Vss N.C DNU N.C I/O3 I/O2 I/O1 I/O0 N.C DNU N.C N.C
PACKAGE DIMENSIONS
48-PIN LEAD PLASTIC VERY VERY THIN SMALL OUT-LINE PACKAGE TYPE (I) 48 - WSOP1 - 1217F
Unit :mm
0.70 MAX 15.400.10 0.580.04
#1
+0.0 7 -0 .03
#48
+0 .0 7 - 0.0 3
0.16
1 2.0 00.10
0.5 0TY P (0.500.0 6)
0 .20
#24
#25
(0.1Min)
0.10 +0.0 755 -0 .03
~8 0
0.45~0.75 17.00 0.20
6
K9F2808Q0B-DCB0,DIB0 K9F2808U0B-VCB0,VIB0
K9F2808U0B-YCB0,YIB0 K9F2808U0B-DCB0,DIB0
FLASH MEMORY
PIN DESCRIPTION
Pin Name I/O0 ~ I/O7 Pin Function DATA INPUTS/OUTPUTS The I/O pins are used to input command, address and data, and to output data during read operations. The I/O pins float to high-z when the chip is deselected or when the outputs are disabled. COMMAND LATCH ENABLE The CLE input controls the activating path for commands sent to the command register. When active high, commands are latched into the command register through the I/O ports on the rising edge of the WE signal. ADDRESS LATCH ENABLE The ALE input controls the activating path for address to the internal address registers. Addresses are latched on the rising edge of WE with ALE high. CHIP ENABLE The CE input is the device selection control. When the device is in the Busy state, CE high is ignored, and the device does not return to standby mode in program or erase opertion. Regarding CE control during read operation, refer to 'Page read' section of Device operation. READ ENABLE The RE input is the serial data-out control, and when active drives the data onto the I/O bus. Data is valid tREA after the falling edge of RE which also increments the internal column address counter by one. WRITE ENABLE The W E input controls writes to the I/O port. Commands, address and data are latched on the rising edge of the WE pulse. WRITE PROTECT The WP pin provides inadvertent write/erase protection during power transitions. The internal high voltage generator is reset when the WP pin is active low. READY/BUSY OUTPUT The R/B output indicates the status of the device operation. When low, it indicates that a program, erase or random read operation is in process and returns to high state upon completion. It is an open drain output and does not float to high-z condition when the chip is deselected or when outputs are disabled. OUTPUT BUFFER POWER VCCQ is the power supply for Output Buffer. VccQ is internally connected to Vcc, thus should be biased to Vcc. POWER VCC is the power supply for device. GROUND NO CONNECTION Lead is not internally connected. GND INPUT FOR ENABLING SPARE AREA To do sequential read mode including spare area , connect this input pin to Vss or set to static low state or to do sequential read mode excluding spare area , connect this input pin to Vcc or set to static high state. DO NOT USE Leave it disconnected.
CLE
ALE
CE
RE
WE
WP
R/B
VccQ
Vcc Vss N.C
GND
DNU
NOTE : Connect all VCC and VSS pins of each device to common power supply outputs.
7
K9F2808Q0B-DCB0,DIB0 K9F2808U0B-VCB0,VIB0
K9F2808U0B-YCB0,YIB0 K9F2808U0B-DCB0,DIB0
FLASH MEMORY
Figure 1. FUNCTIONAL BLOCK DIAGRAM
VCC VSS A9 - A 23 X-Buffers Latches & Decoders Y-Buffers Latches & Decoders
128M + 4M Bit NAND Flash ARRAY
A0 - A7
(512 + 16)Byte x 32768 Page Register & S/A
A8
Command Command Register
Y-Gating
I/O Buffers & Latches CE RE WE Control Logic & High Voltage Generator
Vcc/V CCQ VSS I/0 0 I/0 7
Global Buffers
Output Driver
CLE ALE WP
Figure 2. ARRAY ORGANIZATION
1 Block =32 Pages = (16K + 512) Byte
32K Pages (=1,024 Blocks)
1st half Page Register (=256 Bytes)
2nd half Page Register (=256 Bytes)
1 Page = 528 Byte 1 Block = 528 Bytes x 32 Pages = (16K + 512) Byte 1 Device = 528Byte x 32Pages x 1024 Blocks = 132 Mbits 8 bit
512B Byte
16 Byte
Page Register
512 Byte 16 Byte
I/O 0 ~ I/O 7
I/O 0 1st Cycle 2nd Cycle 3rd Cycle A0 A9 A17
I/O 1 A1 A10 A18
I/O 2 A2 A11 A19
I/O 3 A3 A12 A20
I/O 4 A4 A13 A21
I/O 5 A5 A14 A22
I/O 6 A6 A15 A23
I/O 7 A7 A16 *L Column Address Row Address (Page Address)
NOTE : Column Address : Starting Address of the Register. 00h Command(Read) : Defines the starting address of the 1st half of the register. 01h Command(Read) : Defines the starting address of the 2nd half of the register. * A 8 is set to "Low" or "High" by the 00h or 01h Command. * L must be set to "Low". * The device ignores any additional input of address cycles than reguired.
8
K9F2808Q0B-DCB0,DIB0 K9F2808U0B-VCB0,VIB0
K9F2808U0B-YCB0,YIB0 K9F2808U0B-DCB0,DIB0
FLASH MEMORY
PRODUCT INTRODUCTION
The K9F2808X0B is a 132Mbit(138,412,032 bit) memory organized as 32,768 rows(pages) by 528 columns. Spare 16 columns are located in 512 to 527 column address. A 528-byte data register is connected to memory cell arrays accommodating data transfer between the I/O buffers and memory during page read and page program operations. The memory array is made up of 16 cells that are serially connected like NAND structure. Each of the 16 cells resides in a different page. A block consists of the 32 pages formed by one NAND structures, totaling 8448 NAND structures of 16 cells. The array organization is shown in Figure 2. Program and read operations are executed on a page basis, while erase operation is executed on a block basis. The memory array consists of 1024 blocks, and a block is separately erasable by 16K-byte unit. It indicates that the bit by bit erase operation is prohibited on the K9F2808X0B. The K9F2808X0B has addresses multiplexed with 8 I/O s. This scheme dramatically reduces pin counts and allows systems upgrades to future densities by maintaining consistency in system board design. Command, address and data are all written through I/O s by bringing WE to low while CE is low. Data is latched on the rising edge of WE. Command Latch Enable(CLE) and Address Latch Enable(ALE) are used to multiplex command and address respectively, via the I/O pins. All commands require one bus cycle except Page Program command and Block Erase command which require two cycles: one cycle for setup and another for execution. The 16M byte physical space requires 24 addresses, thereby requiring three cycles for byte-level addressing: column address, low row address and high row address, in that order. Page Read and Page Program need the same three address cycles following required command input. In Block Erase operation, however, only two row address cycles are used. Device operations are selected by writing specific commands into command register. Table 1 defines the specific commands of the K9F2808X0B.
Table 1. COMMAND SETS
Function Read 1 Read 2 Read ID Reset Page Program Block Erase Read Status 1st. Cycle 00h/01h (1) 50h 90h FFh 80h 60h 70h 2nd. Cycle 10h D0h O O Acceptable Command during Busy
NOTE : 1. The 00h command defines starting address of the 1st half of registers. The 01h command defines starting address of the 2nd half of registers. After data access on 2nd half of register by the 01h command, start pointer is automatically moved to 1st half register(00h) on the next cycle. Caution : Any undefined command inputs are prohibited except for above command set of Table 1.
9
K9F2808Q0B-DCB0,DIB0 K9F2808U0B-VCB0,VIB0
K9F2808U0B-YCB0,YIB0 K9F2808U0B-DCB0,DIB0
FLASH MEMORY
Rating K9F2808Q0B(1.8V) K9F2808U0B(3.3V) -0.6 to + 4.6 -0.6 to + 4.6 -0.6 to + 4.6 -10 to + 125 -40 to + 125 V V V C C
ABSOLUTE MAXIMUM RATINGS
Parameter Symbol VIN/OUT Voltage on any pin relative to V SS VCC VCCQ Temperature Under Bias Storage Temperature K9F2808X0B-YCB0,DCB0 K9F2808X0B-YIB0,DIB 0 TSTG TBIAS -0.6 to + 2.45 -0.2 to + 2.45 -0.2 to + 2.45 Unit
-65 to + 150
NOTE: 1. Minimum DC voltage is -0.6V on input/output pins and -0.2V on Vcc and VccQ pins. During transitions, this level may undershoot to -2.0V for periods <20ns. Maximum DC voltage on input/output pins is V CCQ +0.3V which, during transitions, may overshoot to V C +2.0V for periods <20ns. C 2. Permanent device damage may occur if ABSOLUTE MAXIMUM RATINGS are exceeded. Functional operation should be restricted to the conditions as detailed in the operational sections of this data sheet. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
RECOMMENDED OPERATING CONDITIONS
(Voltage reference to GND, K9F2808X0B-YCB0,DCB 0:TA=0 to 70C, K9F2808X0B-YIB0,DIB0:TA=-40 to 85C)
Parameter Supply Voltage Supply Voltage Supply Voltage Symbol Min V CC VCCQ VSS 1.7 1.7 0 K9F2808Q0B(1.8V) Typ. 1.8 1.8 0 Max 1.9 1.9 0 Min 2.7 2.7 0 K9F2808U0B(3.3V) Typ. 3.3 3.3 0 Max 3.6 3.6 0 V V V Unit
DC AND OPERATING CHARACTERISTICS(Recommended operating conditions otherwise noted.)
K9F2808Q0B(1.8V) Parameter Symbol Test Conditions CE=VIL, IOUT=0mA K9F2808Q0B: tRC=70ns K9F2808U0B: tRC=50ns CE=VIH, WP =0V/VCC CE=VCC-0.2, WP =0V/V CC VIN=0 to Vcc(max) VOUT=0 to Vcc(max) I/O pins Input High Voltage VIH Except I/O pins Input Low Voltage, All inputs Output High Voltage Level Output Low Voltage Level VIL VOH K9F2808Q0B :IOH=-100 A K9F2808U0B :IOH=-400A K9F2808Q0B :IOL=100uA K9F2808U0B :IOL=2.1mA K9F2808Q0B :VOL=0.1V K9F2808U0B :VOL=0.4V VCC-0.4 -0.3 VCCQ-0.1 Min VccQ-0.4 Typ 5 5 5 10 Max 15 15 15 1 50 10 10 VccQ+0 .3 VCC +0.3 0.4 K9F2808U0B(3.3V) Min 2.0 2.0 -0.3 2.4 Typ 10 10 10 10 Max 20 20 20 1 50 10 10 VCCQ+0.3 VCC+0.3 0.8 V A mA Unit
Operat- Sequential Read ing Current Program Erase Stand-by Current(TTL) Stand-by Current(CMOS) Input Leakage Current Output Leakage Current
ICC1 ICC2 ICC3 ISB1 ISB2 ILI ILO
VOL IOL (R/B)
3
4
0.1 -
8
10
0.4 mA
Output Low Current(R/B)
10
K9F2808Q0B-DCB0,DIB0 K9F2808U0B-VCB0,VIB0
K9F2808U0B-YCB0,YIB0 K9F2808U0B-DCB0,DIB0
FLASH MEMORY
Typ. Max 1024 Unit Blocks
VALID BLOCK
Parameter Valid Block Number Symbol NVB Min 1004
NOTE: 1. The K9F2808X0B may include invalid blocks when first shipped. Additional invalid blocks may develop while being used. The number of valid blocks is presented with both cases of invalid blocks considered. Invalid blocks are defined as blocks that contain one or more bad bits. Do not erase or program factory-marked bad blocks. Refer to the attached technical notes for a appropriate management of invalid blocks. 2. The 1st block, which is placed on 00h block address, is fully guaranteed to be a valid block, does not require Error Correcti on.
AC TEST CONDITION
(K9F2808X0B-YCB0, DCB0 :TA=0 to 70C, K9F2808X0B-YIB0,DIB0:TA=-40 to 85C K9F2808Q0B : Vcc=1.7V~1.9V , K9F2808U0B : Vcc=2.7V~3.6V unless otherwise noted) Parameter Input Pulse Levels Input Rise and Fall Times Input and Output Timing Levels K9F2808Q0B:Output Load (VccQ:1.8V +/-10%) K9F2808U0B:Output Load (VccQ:3.0V +/-10%) K9F2808U0B:Output Load (VccQ:3.3V +/-10%) K9F2808Q0B 0V to VccQ 5ns VccQ/2 1 TTL GATE and CL=30pF K9F2808U0B 0.4V to 2.4V 5ns 1.5V 1 TTL GATE and CL=50pF 1 TTL GATE and CL=100pF
CAPACITANCE(TA=25C, VCC=1.8V/3.3V, f=1.0MHz)
Item Input/Output Capacitance Input Capacitance Symbol CI/O CIN Test Condition VIL=0V VIN=0V Min Max 10 10 Unit pF pF
NOTE : Capacitance is periodically sampled and not 100% tested.
MODE SELECTION
CLE H L H L L L L X X X X X ALE L H L H L L L X X X X
(1)
CE L L L L L L L X X X X H
WE
RE H H H H H
WP X X H H H X Data Input Data Output Write Mode Read Mode
Mode Command Input Address Input(3clock) Command Input Address Input(3clock)
H H X X X X X H H X X X X
X X H H L 0V/V
CC(2)
During Read(Busy) on K9F2808U0B_Y or K9F2808U0B_V During Read(Busy) on the devices except K9F2808U0B_Y and K9F2808U0B_V During Program(Busy) During Erase(Busy) Write Protect Stand-by
X
NOTE : 1. X can be VIL or VIH. 2. WP should be biased to CMOS high or CMOS low for standby.
Program/Erase Characteristics
Parameter Program Time Number of Partial Program Cycles in the Same Page Block Erase Time Main Array Spare Array tBERS Symbol tPROG Nop Min Typ K9F2808Q0B:3 00 K9F2808U0B:200 2 Max 500 2 3 3 Unit s cycles cycles ms
11
K9F2808Q0B-DCB0,DIB0 K9F2808U0B-VCB0,VIB0
K9F2808U0B-YCB0,YIB0 K9F2808U0B-DCB0,DIB0
FLASH MEMORY
K9F2808U0B Min 0 10 0 10 25 0 10 20 10 50 15 Max Unit ns ns ns ns ns ns ns ns ns ns ns
AC Timing Characteristics for Command / Address / Data Input
K9F2808Q0B Parameter CLE Set-up Time CLE Hold Time CE Setup Time CE Hold Time WE Pulse Width ALE Setup Time ALE Hold Time Data Setup Time Data Hold Time Write Cycle Time WE High Hold Time Symbol tCLS tCLH tCS tCH tWP tALS tALH tDS tDH tWC tWH Min 0 20 0 20 25 (1) 0 20 20 20 70 20 Max -
NOTE : 1. If tCS is set less than 10ns, tWP must be minimum 35ns, otherwise, tWP may be minimum 25ns.
AC Characteristics for Operation
K9F2808Q0B Parameter Data Transfer from Cell to Register ALE to RE Delay( ID read ) ALE to RE Delay(Read cycle) CLE to RE Delay Ready to RE Low RE Pulse Width WE High to Busy Read Cycle Time CE Access Time RE Access Time RE High to Output Hi-Z CE High to Output Hi-Z RE High Hold Time Output Hi-Z to RE Low WE High to RE Low Device Resetting Time(Read/Program/Erase) Last RE High to Busy (at sequential read) K9F2808U0B-Y only CE High to Ready(in case of interception by CE at read) CE High Hold Time(at the last serial read) (2) Symbol tR tAR1 tAR2 tCLR tRR tRP tWB tRC tCEA tREA tRHZ tCHZ tREH tIR tWHR tRST tRB tCRY Min 20 50 50 20 35 70 15 20 0 60 100 Max 10 150 60 45 30 20 5/10/500(1) 100 50 +tr(R/B) (3) K9F2808U0B Min 20 50 50 20 25 50 15 15 0 60 100 Max 10 100 45 35 30 20 5/10/500 (1) 100 50 +tr(R/B) (3) Unit s ns ns ns ns ns ns ns ns ns ns ns ns ns ns s ns ns ns
tCEH
NOTE : 1. If reset command(FFh) is written at Ready state, the device goes into Busy for maximum 5us. 2. To break the sequential read cycle, CE must be held high for longer time than tCEH. 3. The time to Ready depends on the value of the pull-up resistor tied R/B pin.
12
K9F2808Q0B-DCB0,DIB0 K9F2808U0B-VCB0,VIB0
K9F2808U0B-YCB0,YIB0 K9F2808U0B-DCB0,DIB0
FLASH MEMORY
NAND Flash Technical Notes
Invalid Block(s)
Invalid blocks are defined as blocks that contain one or more invalid bits whose reliability is not guaranteed by Samsung. The information regarding invalid block(s) is so called as the invalid block information. Devices ,regardless of having invalid block(s), have the same quality level because all valid blocks have same AC and DC characteristics. An invalid block(s) does not affect the performance of valid block(s) because it's bit line and common source line is isolated by a select transistor. The system design must be able to mask out invalid block(s) via address mapping. The 1st block, which is placed on 00h block address, is fully guaranteed to be a valid block, does not require Error Correction.
Identifying Invalid Block(s)
All device locations are erased(FFh) except locations where the invalid block(s) information is written prior to shipping. The invalid block(s) status is defined by the 6th byte in the spare area. Samsung makes sure that either 1st or 2nd page of every invalid block has non-FFh data at the column address of 517. Since invalid block information is also erasable in most cases, it is impossible to recover the information once it was erased. Therefore, system must be able to recognize the invalid block(s) based on the original invalid block information and create invalid block table via the following suggested flow chart(Figure 3). Any intentional erasure of the original invalid block information is prohibited.
Start
Set Block Address = 0
Increment Block Address
Create (or update) Invalid Block(s) Table
No
*
Check "FFh" ? Yes
Check "FFh" at the column address 517 of the 1st and 2nd page in the block
No
Last Block ?
Yes
End
Figure 3. Flow chart to create invalid block table.
13
K9F2808Q0B-DCB0,DIB0 K9F2808U0B-VCB0,VIB0
K9F2808U0B-YCB0,YIB0 K9F2808U0B-DCB0,DIB0
FLASH MEMORY
NAND Flash Technical Notes (Continued)
Error in write or read operation
Within its life time, the additional invalid blocks may develop with NAND Flash memory. Refer to the qualification report for actual data. The following possible failure modes should be considered to implement a highly reliable system. In the case of status read failure after erase or program, block replacement should be done. Because program status fail during a page program does not affect the data of the other pages in the same block, block replacement can be executed with a page-sized buffer by finding an erased empty block and reprogramming the current target data and copying the rest of the replaced block. To improve the efficiency of memory space, we recommend using ECC without any block replacement in read or verification failure due to single bit error case. Th e said additional block failure rate does not include those reclaimed blocks. Failure Mode Erase Failure Write Program Failure Single Bit Failure Detection and Countermeasure sequence Status Read after Erase --> Block Replacement Status Read after Program --> Block Replacement Read back ( Verify after Program) --> Block Replacement or ECC Correction Verify ECC -> ECC Correction
Read
ECC
: Error Correcting Code --> Hamming Code etc. Example) 1bit correction & 2bit detection
Program Flow Chart
If ECC is used, this verification operation is not needed. Start Write 00h
Write 80h
Write Address
Write Address
Write Data
Wait for tR Time
Write 10h
Verify Data
No
*
Program Error
Read Status Register
Yes Program Completed
I/O 6 = 1 ? or R/B = 1 ? Yes No I/O 0 = 0 ?
No
*
*
Program Error
: If program operation results in an error, map out the block including the page in error and copy the target data to another block.
Yes
14
K9F2808Q0B-DCB0,DIB0 K9F2808U0B-VCB0,VIB0
K9F2808U0B-YCB0,YIB0 K9F2808U0B-DCB0,DIB0
FLASH MEMORY
NAND Flash Technical Notes (Continued)
Erase Flow Chart
Start Write 60h Write Block Address Write D0h Read Status Register
Read Flow Chart
Start Write 00h Write Address Read Data ECC Generation
I/O 6 = 1 ? or R/B = 1 ? Yes No I/O 0 = 0 ? Yes Erase Completed
No
Reclaim the Error
No
Verify ECC Yes Page Read Completed
*
Erase Error
*
: If erase operation results in an error, map out the failing block and replace it with another block.
Block Replacement
1st (n-1)th nth (page)
{ {
Block A 2 an error occurs. Buffer memory of the controller. Block B 1
1st (n-1)th nth (page)
* Step1 When an error happens in the nth page of the Block 'A' during erase or program operation. * Step2 Copy the nth page data of the Block 'A' in the buffer memory to the nth page of another free block. (Block 'B') * Step3 Then, copy the data in the 1st ~ (n-1)th page to the same location of the Block 'B'. * Step4 Do not further erase Block 'A' by creating an 'invalid Block' table or other appropriate scheme.

15
K9F2808Q0B-DCB0,DIB0 K9F2808U0B-VCB0,VIB0
K9F2808U0B-YCB0,YIB0 K9F2808U0B-DCB0,DIB0
FLASH MEMORY
Pointer Operation of K9F2808X0B
Samsung NAND Flash has three address pointer commands as a substitute for the two most significant column addresses. '00h' command sets the pointer to 'A' area(0~255byte), '01h' command sets the pointer to 'B' area(256~511byte), and '50h' command sets the pointer to 'C' area(512~527byte). With these commands, starting column address can be set to somewhere of a whole page(0~527byte). '00h' or '50h' is sustained until another address pointer command is entered. But, '01h' command is effective only for one time operation. After any operation of Read, Program, Erase, Reset, Power_Up following '01h' command, the address pointer returns to 'A' area by itself. To program data starting from 'A' or 'C' area, '00h' or '50h' command must be entered before '80h' command is written. A complete read operation prior to '80h' command is not necessary. To program data starting from 'B' area, '01h' command must be entered right before '80h' command is written.
"A" area (00h plane)
"B" area (01h plane) 256 Byte
"C" area (50h plane) 16 Byte
Table 2. Destination of the pointer Command 00h 01h 50h Pointer position 0 ~ 255 byte 256 ~ 511 byte 512 ~ 527 byte Area 1st half array(A) 2nd half array(B) spare array(C)
256 Byte
"A"
"B"
"C" Internal Page Register
Pointer select commnad (00h, 01h, 50h)
Pointer
Figure 4. Block Diagram of Pointer Operation
(1) Command input sequence for programming 'A' area
The address pointer is set to 'A' area(0~255), and sustained Address / Data input 00h 80h 10h 00h 80h Address / Data input 10h
'A','B','C' area can be programmed. It depends on how many data are inputted.
'00h' command can be omitted.
(2) Command input sequence for programming 'B' area
The address pointer is set to 'B' area(256~512), and will be reset to 'A' area after every program operation is executed. Address / Data input 01h 80h 10h 01h 80h Address / Data input 10h
'B', 'C' area can be programmed. It depends on how many data are inputted.
'01h' command must be rewritten before every program operation
(3) Command input sequence for programming 'C' area
The address pointer is set to 'C' area(512~527), and sustained Address / Data input 50h 80h 10h 50h 80h Address / Data input 10h
Only 'C' area can be programmed.
'50h' command can be omitted.
16
K9F2808Q0B-DCB0,DIB0 K9F2808U0B-VCB0,VIB0
K9F2808U0B-YCB0,YIB0 K9F2808U0B-DCB0,DIB0
FLASH MEMORY
System Interface Using CE don't-care.
For an easier system interface, CE may be inactive during data-loading or sequential data-reading as shown below. The internal 528byte page registers are utilized as seperate buffers for this operation and the system design gets more flexible. In addition, for voice or audio applications which use slow cycle time on the order of u-seconds, de-activating CE during the data-loading and reading would provide significant saving in power consumption.
Figure 5. Program Operation with CE don't-care. CLE
CE don't-care
CE
WE ALE
I/O0~7
80h
Start Add.(3Cycle)
Data Input
Data Input
10h
tCS CE
tCH CE
tCEA
tREA tWP WE I/O0~7 out RE
Figure 6. Read Operation with CE don't-care.
On K9F2808U0B_Y or K9F2808U0B_V CE must be held low during tR
CLE CE
CE don't-care
RE ALE R/B tR
WE
I/O0~7
00h
Start Add.(3Cycle)
Data Output(sequential)
17
K9F2808Q0B-DCB0,DIB0 K9F2808U0B-VCB0,VIB0
K9F2808U0B-YCB0,YIB0 K9F2808U0B-DCB0,DIB0
FLASH MEMORY
* Command Latch Cycle
CLE tCLS tCS CE tCLH tCH
tWP WE
tALS ALE tDS I/O0~7
tALH
tDH
Command
* Address Latch Cycle
tCLS CLE
tCS CE
tWC
tWC
tWP WE tALS ALE tDS I/O0~7 tDH tWH tALH tALS
tWP tWH tALH tALS
tWP
tALH
tDS
tDH
tDS
tDH
A0~A7
A9~A16
A17~A23
18
K9F2808Q0B-DCB0,DIB0 K9F2808U0B-VCB0,VIB0
K9F2808U0B-YCB0,YIB0 K9F2808U0B-DCB0,DIB0
FLASH MEMORY
* Input Data Latch Cycle
tCLH CLE
tCH CE
tALS ALE
tWC
tWP WE tDS I/O0~7 tWH tDH
tWP
tDH
tWP tDH
tDS
tDS
DIN 0
DIN 1
DIN 511
* Serial Access Cycle after Read(CLE=L, WE=H, ALE=L)
CE
tRC tREH tCHZ tOH
RE
tRP
tRHZ
tREA
tREA
tREA
tRHZ tOH Dout
I/O0~7 tRR R/B
Dout
Dout
NOTES : Transition is measured 200mV from steady state voltage with load. This parameter is sampled and not 100% tested.
19
K9F2808Q0B-DCB0,DIB0 K9F2808U0B-VCB0,VIB0
K9F2808U0B-YCB0,YIB0 K9F2808U0B-DCB0,DIB0
FLASH MEMORY
* Status Read Cycle
tCLR CLE tCLS tCS CE tCH tWP WE tWHR RE tDS I/O0~7 70h tDH tIR tREA tRHZ tOH Status Output tCEA tCHZ tOH tCLH
READ1 OPERATION(READ ONE PAGE)
CLE
On K9F2808U0B_Y or K9F2808U0B_V CE must be held low during tR
1)
tCEH tCHZ tOH
CE tWC WE tWB tAR2 ALE tR RE tRR I/O0~7
00h or 01h A0 ~ A7 A9 ~ A16 A17 ~ A24 Dout N Dout N+1 Dout N+2 Dout N+3
tCRY
tRC
tRHZ tOH
Dout 527
Column Address
Page(Row) Address Busy
tRB
R/B
1)
NOTE : 1) is only valid on K9F2808U0B_Y or K9F2808U0B_V
20
K9F2808Q0B-DCB0,DIB0 K9F2808U0B-VCB0,VIB0
K9F2808U0B-YCB0,YIB0 K9F2808U0B-DCB0,DIB0
FLASH MEMORY
READ2 OPERATION(READ ONE PAGE)
CLE
On K9F2808U0B_Y or K9F2808U0B_V CE must be held low during tR
CE
WE tWB ALE
tR tAR2 tRR
RE
I/O0~7
50h
A 0 ~ A7
A 9 ~ A16
A17 ~ A23
Dout 511+M
Dout 511+M+1
Dout 527
R/B M Address
A0~A3 : Valid Address A4~A7 : Dont care
Selected Row
512
16 Start address M
PAGE PROGRAM OPERATION
CLE
CE tWC WE tWB ALE tPROG tWC tWC
RE
Din N Din N+1
I/O0~7
80h
A0 ~ A7 A 9 ~ A16 A17 ~ A23 Page(Row) Address
Din 527
10h Program Command
70h Read Status Command
I/O0
Sequential Data Column Input Command Address
1 up to 528 Byte Data Serial Input
R/B
I/O0=0 Successful Program I/O0=1 Error in Program
21
K9F2808Q0B-DCB0,DIB0 K9F2808U0B-VCB0,VIB0
K9F2808U0B-YCB0,YIB0 K9F2808U0B-DCB0,DIB0
FLASH MEMORY
BLOCK ERASE OPERATION(ERASE ONE BLOCK)
CLE
CE tWC WE tWB ALE tBERS
RE
I/O0~7
60h
A9 ~ A 16
A17 ~ A23
DOh
70h
I/O 0
Page(Row) Address
R/B
Auto Block Erase Setup Command Erase Command
Busy
Read Status Command
I/O 0=0 Successful Erase I/O 0=1 Error in Erase
MANUFACTURE & DEVICE ID READ OPERATION
tCLR CLE
CE
WE
ALE tAR1 RE tREA I/O 0 ~ 7
90h Read ID Command 00h Address. 1cycle ECh Maker Code Device Code* Device Code
Device K9F2808Q0B K9F2808U0B
Device Code* 33h 73h
22
K9F2808Q0B-DCB0,DIB0 K9F2808U0B-VCB0,VIB0
K9F2808U0B-YCB0,YIB0 K9F2808U0B-DCB0,DIB0
FLASH MEMORY
DEVICE OPERATION
PAGE READ
Upon initial device power up, the device status is initially Read1 command(00h) latched. This operation is also initiated by writing 00h to the command register along with three address cycles. Once the command is latched, it does not need to be written for the following page read operation. Two types of operation are available : random read, serial page read. The random read mode is enabled when the page address is changed. The 528 bytes of data within the selected page are transferred to the data registers in less than 10 s(tR). The system controller can detect the completion of this data transfer(tR) by analyzing the output of R/B pin. Once the data in a page is loaded into the registers, they may be read out by sequential RE pulse of 70ns/50n(K9F2808Q0B:70ns, K9F2808U0B:50ns) period cycle. High to low transitions of the RE clock take out the data from the selected column address up to the last column address. Read1 and Read2 commands determine pointer which selects either main area or spare area. The spare area(512 to 527 bytes) may be selectively accessed by writing the Read2 command. Addresses A to A3 set the starting address of spare area while 0 addresses A to A7 are ignored. To move the pointer back to the main area, Read1 command(00h/01h) is needed. Figures 7 4 through 8 show typical sequence and timing for each read operation. Figure 7,8 details the sequence. Sequential Row Read is available only on K9F2808U0B_Y or K9F2808U0B_V : After the data of last column address is clocked out, the next page is automatically selected for sequential row read. Waiting 10 s again allows reading the selected page. The sequential row read operation is terminated by bringing CE high. Unless the operation is aborted, the page address is automatically incremented for sequential row read as in Read1 operation and spare sixteen bytes of each page may be sequentially read. The Sequential Read 1 and 2 operation is allowed only within a block and after the last page of a block is readout, the sequential read operation must be terminated by bringing CE high. When the page address moves onto the next block, read command and address must be given. Figures 7-1, 8-1 show typical sequence and timings for sequential row read operation.
Figure 7. Read1 Operation CLE CE WE ALE R/B RE I/O0~7
00h Start Add.(3Cycle) A 0 ~ A7 & A9 ~ A23 (00h Command) (01h Command)* Data Output(Sequential)
On K9F2808U0B_Y or K9F2808U0B_V CE must be held low during tR
tR
1st half array
2st half array
1st half array
2st half array
Data Field
Spare Field
Data Field
Spare Field
* After data access on 2nd half array by 01h command, the start pointer is automatically moved to 1st half array (00h) at next cycle.
23
K9F2808Q0B-DCB0,DIB0 K9F2808U0B-VCB0,VIB0
Figure 8. Read2 Operation CLE CE WE ALE
K9F2808U0B-YCB0,YIB0 K9F2808U0B-DCB0,DIB0
FLASH MEMORY
On K9F2808U0B_Y or K9F2808U0B_V CE must be held low during tR
R/B RE I/O0~7
50h Start Add.(3Cycle) A0 ~ A 3 & A9 ~ A23
tR
Data Output(Sequential) Spare Field
( A4 ~ A7 : Dont Care)
1st half array
2nd half array
Data Field
Spare Field
Figure 7-1. Sequential Row Read1 Operation (only for K9F2808U0B-Y and K9F2808U0B-V, valid within a block) tR tR
R/B I/O0 ~
tR
7
00h 01h
Start Add.(3Cycle) A0 ~ A 7 & A9 ~ A24
Data Output 1st
Data Output 2nd (528 Byte)
Data Output Nth (528 Byte) (GND input=H, 00h Command)
1st half array 2nd half array
(GND input=L, 00h Command)
1st half array 2nd half array
(GND input =L, 01h Command)
1st half array 2nd half array
Block
1st 2nd Nth
1st 2nd Nth
1st 2nd Nth
Data Field
Spare Field
Data Field
Spare Field
Data Field
Spare Field
24
K9F2808Q0B-DCB0,DIB0 K9F2808U0B-VCB0,VIB0
K9F2808U0B-YCB0,YIB0 K9F2808U0B-DCB0,DIB0
FLASH MEMORY
Figure 8-1. Sequential Row Read2 Operation (GND Input=Fixed Low) (only for K9F2808U0B-Y and K9F2808U0B-V, valid within a block) tR tR
R/B I/O0~7
Start Add.(3Cycle)
tR
50h
Data Output 1st
Data Output 2nd (16Byte)
Data Output Nth (16Byte)
A0 ~ A 3 & A9 ~ A 2 4 (A 4 ~ A7 : Don t Care)
1st Block Nth
Data Field
Spare Field
PAGE PROGRAM
The device is programmed basically on a page basis, but it allows multiple partial page program of one byte or consecutive bytes up to 528, in a single page program cycle. The number of consecutive partial page program operation within the same page without intervening erase operation should not exceed 2 for main array and 3 for spare array. The addressing may be done in any random order in a block. Page program cycle consists of a serial data loading(up to 528 bytes of data) into the page register, and prog ram of loaded data into the appropriate cell. Serial data loading can start in 2nd half array by moving pointer. About the pointer operation, please refer to the attached technical notes. Serial data loading is executed by entering the Serial Data Input command(80h) and three cycle address input and then serial data loading. The bytes except those to be programmed need not to be loaded. The Page Program confirm command(10h) initiates the programming process. Writing 10h alone without previously entering 80h will not initi ate program process. The internal write controller automatically executes the algorithms and timings necessary for program and verif ication, thereby freeing the CPU for other tasks. Once the program process starts, the Read Status Register command may be entered, with RE and CE low, to read the status register. The CPU can detect the completion of a program cycle by monitoring the R/B output, or the Status bit(I/O 6) of the Status Register. Only the Read Status command and Reset command are valid while programming is in progress. When the Page Program is completed, the Write Status Bit(I/O 0) may be checked(Figure 9). The internal write verification detects only errors for "1"s that are not successfully programmed to "0"s. The command register remains in Read Status command mode until another valid command is written to the command register. Figure 9 details the sequence.
Figure 9. Program & Read Status Operation R/B I/O0~7 tPROG
80h
Address & Data Input A0 ~ A7 & A 9 ~ A23 528 Byte Data
10h
70h
I/O0
Pass
Fail
25
K9F2808Q0B-DCB0,DIB0 K9F2808U0B-VCB0,VIB0
BLOCK ERASE
K9F2808U0B-YCB0,YIB0 K9F2808U0B-DCB0,DIB0
FLASH MEMORY
The Erase operation is done on a block(16K Bytes) basis. Block Erase is executed by entering Erase Setup command(60h) and 2 cycle block addresses and Erase Confirm command(D0h). Only address A14 to A23 is valid while A9 to A13 is ignored. This twostep sequence of setup followed by execution command ensures that memory contents are not accidentally erased due to external noise condition. At the rising edge of WE after erase confirm command input, internal write controller handles erase and erase-verification. When the erase operation is completed, the Write Status Bit(I/O 0) may be checked. Figure 10 details the sequence.
Figure 10. Block Erase Operation tBERS
R/B I/O0~7
60h
Address Input(2Cycle) Block Add. : A 9 ~ A23
D0h
70h
I/O0
Pass
Fail
READ STATUS
The device contains a Status Register which may be read to find out whether program or erase operation is completed, and whether the program or erase operation is completed successfully. After writing 70h command to command register, a read cycle takes out the content of the Status Register to the I/O pins on the falling edge of CE or RE. This two line control allows the system to poll the progress of each device in multiple memory connections even when R/B pins are common-wired. RE or CE does not need to be toggled for updated status. Refer to table 3 for specific Status Register definitions. The command register remains in Status Read mode until further commands are issued to it. Therefore, if the status register is read during a random read cycle, a read command(00 h or 50h) should be given before sequential page read cycle.
Table3. Read Status Register Definition
I/O # I/O 0 I/O 1 I/O 2 I/O 3 I/O 4 I/O 5 I/O 6 I/O 7 Device Operation Write Protect Reserved for Future Use Status Program / Erase Definition "0" : Successful Program / Erase "1" : Error in Program / Erase "0" "0" "0" "0" "0" "0" : Busy "0" : Protected "1" : Ready "1" : Not Protected
26
K9F2808Q0B-DCB0,DIB0 K9F2808U0B-VCB0,VIB0
READ ID
K9F2808U0B-YCB0,YIB0 K9F2808U0B-DCB0,DIB0
FLASH MEMORY
The device contains a product identification mode, initiated by writing 90h to the command register, followed by an address input of 00h. Two read cycles sequentially output the manufacture code(ECh), and the device code (73h) respectively. The command register remains in Read ID mode until further commands are issued to it. Figure 11 shows the operation sequence.
Figure 11. Read ID Operation tCLR tCEA CE WE tAR1 ALE tWHR RE I/O0~7 tREA
90h 00h Address. 1cycle ECh Maker code Device Code* Device code
CLE
Device K9F2808Q0B K9F2808U0B
Device Code* 33h 73h
RESET
The device offers a reset feature, executed by writing FFh to the command register. When the device is in Busy state during random read, program or erase mode, the reset operation will abort these operations. The contents of memory cells being altered are no longer valid, as the data will be partially programmed or erased. The command register is cleared to wait for the next command, and the Status Register is cleared to value C0h when W P is high. Refer to table 4 for device status after reset operation. If the device is already in reset state, new reset command will not be accepted by the command register. The R/B pin transitions to low for tRST after the Reset command is written. Reset command is not necessary for normal operation. Refer to Figure 12 below.
Figure 12. RESET Operation R/B I/O0~7 tRST
FFh
Table4. Device Status
After Power-up Operation Mode Read 1 After Reset Waiting for next command
27
K9F2808Q0B-DCB0,DIB0 K9F2808U0B-VCB0,VIB0
READY/BUSY
K9F2808U0B-YCB0,YIB0 K9F2808U0B-DCB0,DIB0
FLASH MEMORY
The device has a R/ B output that provides a hardware method of indicating the completion of a page program, erase and random read completion. The R/B pin is normally high but transitions to low after program or erase command is written to the command register or random read is started after address loading. It returns to high when the internal controller has finished the operatio n. The pin is an open-drain driver thereby allowing two or more R/B outputs to be Or-tied. Because pull-up resistor value is related to tr(R/ B) and current drain during busy(ibusy) , an appropriate value can be obtained with the following reference chart(Fig 13). Its value c an be determined by the following guidance.
Rp VCC
ibusy 1.8V device - VOL : 0.1V, VOH : VCCq-0.1V 3.3V device - VOL : 0.4V, VOH : 2.4V Ready Vcc
R/B open drain output
VOH
CL
VOL Busy tf GND Device tr
Fig 13 Rp vs tr ,tf & Rp vs ibusy
@ Vcc = 1.8V, Ta = 25C , CL = 30pF @ Vcc = 3.3V, Ta = 25C , C = 100pF L
400
2.4 tr,tf [s] Ibusy [A]
tr ,tf [s]
1.2
200n
1.7
2m tr
0.85 60 0.57 0.43 1.7 90 120
200n tr
100 3.6
200
0.8 0.6
2m
100n
30 1.7
1m
100n
1m
tf
1.7
1.7
tf
3.6
3.6
3.6
1K
2K
3K Rp(ohm)
4K
1K
2K
3K Rp(ohm)
4K
Rp value guidance
VCC(Max.) - VOL(Max.) IOL + IL VCC(Max.) - V OL(Max.) IOL + IL = = 1.85V 3mA + IL 3.2V 8mA + IL
Rp(min, 1.8V part) =
Rp(min, 3.3V part) =
where IL is the sum of the input currents of all devices tied to the R/B pin. Rp(max) is determined by maximum permissible limit of tr
28
Ib usy [A]
300n
Ibusy
3m
300n
Ibusy
300
3m
K9F2808Q0B-DCB0,DIB0 K9F2808U0B-VCB0,VIB0
K9F2808U0B-YCB0,YIB0 K9F2808U0B-DCB0,DIB0
FLASH MEMORY
Data Protection & Powerup sequence
The device is designed to offer protection from any involuntary program/erase during power-transitions. An internal voltage detector disables all functions whenever Vcc is below about 1.1V/2V(K9F2808Q0B:1.1V, K9F2808U0B:2V). WP pin provides hardware protection and is recommended to be kept at VIL during power-up and power-down and recovery time of minimum 1s is required before internal circuit gets ready for any command sequences as shown in Figure 14. The two step command sequence for program/ erase provides additional software protection.
Figure 14. AC Waveforms for Power Transition K9F2808Q0B : ~ 1.5V K9F2808U0B : ~ 2.5V VCC High
K9F2808Q0B : ~ 1.5V K9F2808U0B : ~ 2.5V
WP
WE
29
10s

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