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HT27C040 CMOS 512K8-Bit OTP EPROM
Features
* Operating voltage: +5.0V * Programming voltage - VPP=12.5V0.2V - VCC=6.0V0.2V * High-reliability CMOS technology * Latch-up immunity to 100mA from -1.0V to * 512K8-bits organization * Fast read access time: 70ns * Fast programming algorithm * Programming time 75ms typ. * Two line controls (OE and CE) * Standard product identification code * Commercial temperature range (0C to +70C) * 32-pin DIP/SOP/PLCC package
VCC+1.0V
* CMOS and TTL compatible I/O * Low power consumption - Active: 30mA max. - Standby: 1mA typ.
General Description
The HT27C040 chip family is a low-power, 4096K (4,194,304) bits, +5V electrically one-time programmable (OTP) read-only memories (EPROM). Organized into 512K words with 8 bits per word, it features a fast single address location programming, typically at 75ms per byte. Any byte can be accessed in less than 70ns with respect to Spec. This eliminates the need for WAIT states in high-performance microprocessor systems. The HT27C040 has separate Output Enable (OE) and Chip Enable (CE) controls which eliminate bus contention issues.
Block Diagram
Row A d d re s s C o lu m n A d d re s s
X -D e c o d e r
C e ll A r r a y VCC
Y -D e c o d e r
Y - G a tin g
VSS VPP
CE OE
CE & OE & TEST C o n tr o l L o g ic
SA CKT & O u tp u t B u ffe r
DQ 0~DQ 7
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HT27C040
Pin Assignment
VPP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 A16 A15 A12 A7 A6 A5 A4 A3 A2 A1 A0 DQ0 DQ1 DQ2 VSS 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 VCC A18 A17 A14 A13 A8 A9 A11 OE A10 CE DQ7 DQ6 DQ5 DQ4 DQ3
A7 A6 A5 A4 A3 A2 A1 A0 DQ0 9 10 11 12 13 14 15 16 17 18 19 20 8 7 6 5 A17 A18 VCC 30 31 32 VPP A16 A15 A12 4 VSS DQ2 DQ1 3 2 1
29 28 27
A14 A13 A8 A9 A11 OE A10 CE DQ7
H T27C 040 3 2 P L C C -A
26 25 24 23 22 21
DQ5 DQ4 DQ3
DQ6
H T27C 040 3 2 D IP -A /S O P -A
Pin Description
Pin Name VPP A0~A18 DQ0~DQ7 VSS CE OE VCC I/O/P P I I/O 3/4 I I 3/4 Program voltage supply Address inputs Data inputs/outputs Negative power supply, ground Chip enable Output enable Positive power supply Description
Absolute Maximum Rating
Operation Temperature Commercial ..........................................................................................................0C to +70C Storage Temperature.............................................................................................................................-65C to 125 C Applied VCC Voltage with Respect to VSS................................................................................................ -0.6V to 7.0V Applied Voltage on Input Pin with Respect to VSS..................................................................................... -0.6V to 7.0V Applied Voltage on Output Pin with Respect to VSS ......................................................................... -0.6V to VCC+0.5V Applied Voltage on A9 Pin with Respect to VSS ...................................................................................... -0.6V to 13.5V Applied VPP Voltage with Respect to VSS...............................................................................................-0.6V to 13.5V Applied READ Voltage (Functionality is guaranteed between these limits) ..............................................+4.5V to +5.5V Note: These are stress ratings only. Stresses exceeding the range specified under Absolute Maximum Ratings may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.
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HT27C040
D.C. Characteristics
Symbol Read operation VOH VOL VIH VIL ILI ILO ICC ISB1 ISB2 IPP Output High Level Output Low Level Input High Level Input Low Level Input Leakage Current Output Leakage Current VCC Active Current Standby Current (CMOS) Standby Current (TTL) VPP Read/Standby Current 5V 5V 5V 5V 5V 5V 5V 5V 5V 5V IOH=-0.4mA IOL=2.1mA 3/4 3/4 VIN=0 to 5.5V VOUT=0 to 5.5V CE=VIL, f=5MHz IOUT=0mA CE=VCC0.3V CE=VIH CE=OE=VIL VPP=VCC 2.4 3/4 2 -0.3 -5 -10 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 1 3/4 3/4 3/4 0.45 VCC+0.5 0.8 5 10 30 10 1 100 V V V V mA mA mA mA mA mA Parameter Test Conditions VCC Conditions Min. Typ. Max. Unit
Programming operation VOH VOL VIH VIL ILI VH ICC IPP Output High Level Output Low Level Input High Level Input Low Level Input Load Current A9 Product ID Voltage VCC Supply Current VPP Supply Current 6V 6V 6V 6V 6V 6V 6V 6V CE=VIL IOH=-0.4mA IOL=2.1mA 3/4 3/4 VIN=VIL, VIH 3/4 3/4 2.4 3/4 0.7VCC -0.5 3/4 11.5 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 0.45 VCC+0.5 0.8 5.0 12.5 40 10 V V V V mA V mA mA
Capacitance CIN COUT CVPP Input Capacitance Output Capacitance VPP Capacitance 5V 5V 5V VIN=0V VOUT=0V VPP=0V 3/4 3/4 3/4 8 8 18 12 12 25 pF pF pF
A.C. Characteristics
Symbol Read operation tACC tCE tOE tDF tOH Address to Output Delay Chip Enable to Output Delay Output Enable to Output Delay CE or OE High to Output Float, Whichever Occurred First Output Hold from Address, CE or OE, Whichever Occurred First 5V 5V 5V 5V 5V CE=OE=VIL OE=VIL CE=VIL 3/4 3/4 3/4 3/4 3/4 3/4 0 3/4 3/4 3/4 3/4 3/4 Parameter Test Conditions VCC Conditions Min. Typ.
Ta=+25C5C Max. Unit
70 70 30 25 3/4
ns ns ns ns ns
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HT27C040
Symbol Programming operation tAS tOES tDS tAH tDH tDFP tVPS tPW tVCS tCES tOE tPRT Address Setup Time OE Setup Time Data Setup Time Address Hold Time Data Hold Time Output Enable to Output Float Delay VPP Setup Time CE Program Pulse Width VCC Setup Time CE Setup Time Data Valid from OE VPP Pulse Rise Time During Programming 6V 6V 6V 6V 6V 6V 6V 6V 6V 6V 6V 6V 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 2 2 2 0 2 0 2 50 2 2 3/4 2 3/4 3/4 3/4 3/4 3/4 3/4 3/4 75 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 130 3/4 105 3/4 3/4 150 3/4 ms ms ms ms ms ns ms ms ms ms ns ms Parameter Test Conditions VCC Conditions Min. Typ. Max. Unit
Test waveforms and measurements
2 .4 V AC D r iv in g L e v e ls 0 .4 5 V 2 .0 V 0 .8 V AC
Output test load
1 .3 V (1 N 9 1 4 ) 3 .3 k W
M e a s u re m e n t Level
tR, tF< 20ns (10% to 90%)
C
L
O u tp u t P in
Note: CL=100pF including jig capacitance
Functional Description
Programming of the HT27C040 When the HT27C040 is delivered, the chip has all 4096K bits in the ONE, or HIGH state. ZEROs are loaded into the HT27C040 through programming. The programming mode is entered when 12.50.2V is applied to the VPP pin, OE is at VIH, and CE is VIL. For programming, the data to be programmed is applied with 8 bits in parallel to the data pins. The programming flowchart in Figure 3 shows the fast interactive programming algorithm. The interactive algorithm reduces programming time by using 50ms to 105ms programming pulses and giving each address only as many pulses as is necessary in order to reliably program the data. After each pulse is applied to a given address, the data in that address is verified. If the data is not verified, additional pulses are given until it is verified or until the maximum number of pulses is reached while sequencing through each address of the HT27C040. This process is repeated while sequencing through each address of the HT27C040. This part of the programming algorithm is done at VCC=6.0V to assure that each EPROM bit is programmed to a sufficiently high threshold voltage. This ensures that all bits have sufficient margin. After the final address is completed, the entire EPROM memory is read at VCC=VPP=5.250.25V to verify the entire memory. Program inhibit mode Programming of multiple HT27C040 in parallel with different data is also easily accomplished by using the Program Inhibit Mode. Except for CE, all like inputs of the parallel HT27C040 may be common. A TTL low-level program pulse applied to an HT27C040 CE input with VPP=12.52V, and OE HIGH will program that HT27C040. A high-level CE input inhibits the HT27C040 from being programmed.
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HT27C040
Program verify mode Verification should be performed on the programmed bits to determine whether they were correctly programmed. The verification should be performed with OE at VIL, and CE at VIH, and VPP at its programming voltage. Auto product identification The Auto Product Identification mode allows the reading out of a binary code from an EPROM that will identify its manufacturer and the type. This mode is intended for programming to automatically match the device to be programmed with its corresponding programming algorithm. This mode is functional in the 25C5C ambient temperature range that is required when programming the HT27C040. To activate this mode, the programming equipment must force 12.00.5V on the address line A9 of the HT27C040. Two identifier bytes may then be sequenced from the device outputs by toggling address line A0 from VIL to VIH, when A1=VIH. All other address lines must be held at VIH during Auto Product Identification mode. Byte 0 (A0=VIL) represents the manufacturer code, and byte 1 (A0=VIH), the device code. For HT27C040, these two identifier bytes are given in the Operation mode truth table. When A1=VIL, the HT27C040 will read out the binary code of 7F, continuation code, to signify the unavailability of manufacturer ID codes. Read mode The has two control functions, both of which must be logically satisfied in order to obtain data at outputs. Chip Enable (CE) is the power control and should be used for device selection. Output Enable (OE) is the output control and should be used to gate data to the output pins, independent of device selection. Assuming that addresses are stable, address access time (tACC) is equal to the delay from CE to output (tCE). Data is available at the outputs (tOE) after the falling edge of OE, assuming the CE has been LOW and addresses have been stable for at least tACC-tOE. Standby mode The HT27C040 has CMOS standby mode which reduces the maximum VCC current to 10mA. It is placed in CMOS standby when CE is at V CC 0.3V. The HT27C040 also has a TTL-standby mode which reduces the maximum VCC current to 1.0mA. It is placed in TTL-standby when CE is at VIH. When in standby mode, the outputs are in a high-impedance state, independent of the OE input. Two-line output control function To accommodate multiple memory connections, a two-line control function is provided to allow for:
* Low memory power dissipation * Assurance that output bus contention will not occur
It is recommended that CE be decoded and used as the primary device-selection function, while OE be made a common connection to the READ line from the system control bus. This assures that all deselected memory devices are in their low-power standby mode and that the output pins are only active when data is desired from a particular memory device. System considerations During the switch between active and standby conditions, transient current peaks are produced on the rising and falling edges of Chip Enable. The magnitude of these transient current peaks is dependent on the output capacitance loading of the device. At a minimum, a 0.1mF ceramic capacitor (high frequency, low inherent inductance) should be used on each device between VCC and VPP to minimize transient effects. In addition, to overcome the voltage drop caused by the inductive effects of the printed circuit board traces on EPROM arrays, a 4.7mF bulk electrolytic capacitor should be used between VCC and VPP for each eight devices. The location of the capacitor should be close to where the power supply is connected to the array.
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HT27C040
Operation mode truth table All the operation modes are shown in the table following. Mode Read Output Disable Standby (TTL) Standby (CMOS) Program Program Verify Product Inhibit Manufacturer Code (3) Device Type Code (3) Note: (1) VH = 12.0V 0.5V (2) X=Either VIH or VIL (3) For Manufacturer Code and Device Code, A1=VIH, When A1=VIL, both codes will read 7F CE VIL VIL VIH VCC 0.3V VIL X VIH VIL VIL OE VIL VIH X X VIH VIL X VIL VIL A0 X X X X X X X VIL VIH A1 X X X X X X X VIH VIH A9 X X X X X X X VH (1) VH (1) VPP VCC VCC VCC VCC VPP VPP VPP VCC VCC Output Dout High Z High Z High Z DIN DOUT High Z 1C 04
Product Identification Code
Code Manufacturer Device Type Continuation 1 0 0 1 1 1 1 1 1 1 7F Pins A0 0 1 0 A1 1 1 0 DQ7 0 0 0 DQ6 0 0 1 DQ5 0 0 1 DQ4 1 0 1 DQ3 1 0 1 DQ2 1 1 1 DQ1 0 0 1 DQ0 0 0 1 Hex Data 1C 04 7F
A d d re s s CE tC
E
A d d r e s s V a lid
tD
.
OE tA O u tp u t H IG H Z
CC
tO
E
tO
H
O u tp u t V a lid
Figure 1. A.C. waveforms for read operation
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HT27C040
P ro g ra m A d d re s s V V V V 6 .0 V 5 .0 V 1 2 .5 V 5 .0 V tP CE V V
IH IL RT IH IL
Read ( V e r ify )
A d d r e s s S ta b le tA
S
tO
E
tA
H
D a ta
IH IL
D a ta In tD
S
D a ta O u t V a lid tD
H
VCC
tD tV tV
CS PS
.P
VPP
tP
W
tO
ES
OE
V V
IH IL
Figure 2. Programming waveforms
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HT27C040
START
A d d r e s s = . ir s t L o c a tio n
V
V
CC PP
= 6 .0 V = 1 2 .5 V
X=0
In te r a c tiv e S e c tio n
P ro g ra m
o n e 7 5 m s P u ls e
In c re m e n t X
X=20? No . a il V e r ify B y te ? P ass In c re m e n t A d d re s s No Last A d d re s s Yes V V e r ify S e c tio n
CC
Yes
. a il
=V
PP
= 5 .2 5 V
V e r ify a ll B y te s ? P ass D e v ic e P a s s e d
. a il
D e v ic e . a ile d
N o te : E ith e r 1 0 5 m s o r 5 0 m s p u ls e .
Figure 3. Fast programming flowchart
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HT27C040
Holtek Semiconductor Inc. (Headquarters) No.3, Creation Rd. II, Science-based Industrial Park, Hsinchu, Taiwan Tel: 886-3-563-1999 Fax: 886-3-563-1189 Holtek Semiconductor Inc. (Sales Office) 11F, No.576, Sec.7 Chung Hsiao E. Rd., Taipei, Taiwan Tel: 886-2-2782-9635 Fax: 886-2-2782-9636 Fax: 886-2-2782-7128 (International sales hotline) Holtek Semiconductor (Hong Kong) Ltd. RM.711, Tower 2, Cheung Sha Wan Plaza, 833 Cheung Sha Wan Rd., Kowloon, Hong Kong Tel: 852-2-745-8288 Fax: 852-2-742-8657 Holtek Semiconductor (Shanghai) Inc. 7th Floor, Building 2, No.889, Yi Shan Rd., Shanghai, China Tel: 021-6485-5560 Fax: 021-6485-0313 Holmate Technology Corp. 48531 Warm Springs Boulevard, Suite 413, Fremont, CA 94539 Tel: 510-252-9880 Fax: 510-252-9885 Copyright O 2001 by HOLTEK SEMICONDUCTOR INC. The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek assumes no responsibility arising from the use of the specifications described. The applications mentioned herein are used solely for the purpose of illustration and Holtek makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. Holtek reserves the right to alter its products without prior notification. For the most up-to-date information, please visit our web site at http://www.holtek.com.tw.
Rev. 1.00
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April 30, 2001

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