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N25S818HA
256Kb Low Power Serial SRAMs
32K x 8 bit Organization Overview
The ON Semiconductor serial SRAM family includes several integrated memory devices including this 256Kb serially accessed Static Random Access Memory, internally organized as 32K words by 8 bits. The devices are designed and fabricated using ON Semiconductor's advanced CMOS technology to provide both high-speed performance and low power. The devices operate with a single chip select (CS) input and use a simple Serial Peripheral Interface (SPI) serial bus. A single data in and data out line is used along with a clock to access data within the devices. The N25S818HA devices include a HOLD pin that allows communication to the device to be paused. While paused, input transitions will be ignored. The devices can operate over a wide temperature range of -40oC to +85oC and can be available in several standard package offerings.
Features
* Power Supply Range 1.7 to 1.95V * Very low standby current Typical Isb as low as 200nA * Very low operating current As low as 3mA * Simple memory control Single chip select (CS) Serial input (SI) and serial output (SO) * Flexible operating modes Word read and write Page mode (32 word page) Burst mode (full array) * Organization 32K x 8 bit * Self timed write cycles * Built-in write protection (CS high) * HOLD pin for pausing communication * High reliability Unlimited write cycles * RoHS Compliant Packages Green SOIC and TSSOP
Device Options
Part Number N25S818HAS2 N25S818HAT2 Density Power Supply (V) 1.8 Speed (MHz) 16 Package SOIC TSSOP Typical Standby Current 200nA Read/Write Operating Current 3 mA @ 1Mhz
256Kb
(c)2008 SCILLC. All rights reserved. July 2008 - Rev. 9
Publication Order Number: N25S818HA/D
N25S0818HA
Package Configurations Pin Names
Pin Name CS SCK SI SO HOLD NC VCC VSS Pin Function Chip Select Input Serial Clock Input Serial Data Input Serial Data Output Hold Input No Connect Power Ground CS SO NC VSS
1 8
VCC HOLD SCK SI
SOIC
2 3 4
7 6 5
CS SO NC VSS
1
8
VCC HOLD SCK SI
TSSOP
2 3 4
7 6 5
Functional Block Diagram
SCK HOLD
Clock Circuitry
CS
Decode Logic SRAM Array Data In Receiver
SI
SO
Data Out Buffer
Rev. 9 | Page 2 of 15 | www.onsemi.com
N25S0818HA
Absolute Maximum Ratings1
Item Voltage on any pin relative to VSS Voltage on VCC Supply Relative to VSS Power Dissipation Storage Temperature Operating Temperature Soldering Temperature and Time Symbol VIN,OUT VCC PD TSTG TA TSOLDER Rating -0.3 to VCC+0.3 -0.3 to 4.5 500 -40 to 125 -40 to +85 260oC, 10sec Unit V V mW
oC o o
C C
1. Stresses greater than those listed above may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operating section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
Operating Characteristics (Over Specified Temperature Range)
Item Supply Voltage Input High Voltage Input Low Voltage Output High Voltage Output Low Voltage Input Leakage Current Output Leakage Current Read/Write Operating Current Standby Current Symbol VCC VIH VIL VOH VOL ILI ILO ICC1 ICC2 ICC3 ISB IOH = -0.4mA IOL = 1mA CS = VCC, VIN = 0 to VCC CS = VCC, VOUT = 0 to VCC F = 1MHz, IOUT = 0 F = 10MHz, IOUT = 0 F = fCLK MAX, IOUT = 0 CS = VCC, VIN = VSS or VCC 200 Test Conditions 1.8V Device Min. 1.7 0.7 x VCC -0.3 VCC-0.5 0.2 0.5 0.5 3 6 10 500 Typ1 Max 1.95 VCC+0.3 0.8 Unit V V V V V A A mA mA mA nA
1. Typical values are measured at Vcc=Vcc Typ., TA=25C and are not 100% tested.
Capacitance1
Item Input Capacitance I/O Capacitance Symbol CIN CI/O Test Condition VIN = 0V, f = 1 MHz, TA = 25oC VIN = 0V, f = 1 MHz, TA = 25oC Min Max 7 7 Unit pF pF
1. These parameters are verified in device characterization and are not 100% tested
Rev. 9 | Page 3 of 15 | www.onsemi.com
N25S0818HA
Timing Test Conditions
Item Input Pulse Level Input Rise and Fall Time Input and Output Timing Reference Levels Output Load Operating Temperature 0.1VCC to 0.9 VCC 5ns 0.5 VCC CL = 100pF -40 to +85 oC
Timing
Item Clock Frequency Clock Rise Time Clock Fall Time Clock High Time Clock Low Time Clock Delay Time CS Setup Time CS Hold Time CS Disable Time SCK to CS Data Setup Time Data Hold Time Output Valid From Clock Low Output Hold Time Output Disable Time HOLD Setup Time HOLD Hold Time HOLD Low to Output High-Z HOLD High to Output Valid Symbol fCLK tR tF tHI tLO tCLD tCSS tCSH tCSD tSCS tSU tHD tV tHO tDIS tHS tHH tHZ tHV 10 10 10 50 0 20 32 32 32 32 50 32 5 10 10 32 Min. Max. 16 2 2 Units MHz us us ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns
Rev. 9 | Page 4 of 15 | www.onsemi.com
N25S0818HA
Serial Input Timing
tCSD CS tR SCK tSU SI MSB in tCSS tHD LSB in tF tCSH tSCS tCLD
SO
High-Z
Serial Output Timing
CS tLO SCK tV SO tDIS MSB out Don't Care LSB out tHI tCSH
SI
Hold Timing
CS tHS SCK tHH SO n+2 n+1 tHZ SI n+2 n+1 n Don't Care n n High-Z tHS tHH
tHV
n tSU n-1
n-1
HOLD
Rev. 9 | Page 5 of 15 | www.onsemi.com
N25S0818HA
Control Signal Descriptions
Signal CS Name Chip Select I/O I Description A low level selects the device and a high level puts the device in standby mode. If CS is brought high during a program cycle, the cycle will complete and then the device will enter standby mode. When CS is high, SO is in high-Z. CS must be driven low after power-up prior to any sequence being started. Synchronizes all activities between the memory and controller. All incoming addresses, data and instructions are latched on the rising edge of SCK. Data out is updated on SO after the falling edge of SCK. Receives instructions, addresses and data on the rising edge of SCK. Data is transferred out after the falling edge of SCK. A high level is required for normal operation. Once the device is selected and a serial sequence is started, this input may be taken low to pause serial communication without resetting the serial sequence. The pin must be brought low while SCK is low for immediate use. If SCK is not low, the Hold function will not be invoked until the next SCK high to low transition. The device must remain selected during this sequence. SO is high-Z during the Hold time and SI and SCK are inputs are ignored. To resume operations, HOLD must be pulled high while the SCK pin is low. Lowering the HOLD input at any time will take to SO output to High-Z.
SCK SI SO
Serial Clock Serial Data In Serial Data Out
I I O
HOLD
Hold
I
Functional Operation Basic Operation
The 256Kb serial SRAM is designed to interface directly with a standard Serial Peripheral Interface (SPI) common on many standard micro-controllers. It may also interface with other non-SPI ports by programming discrete I/O lines to operate the device. The serial SRAM contains an 8-bit instruction register and is accessed via the SI pin. The CS pin must be low and the HOLD pin must be high for the entire operation. Data is sampled on the first rising edge of SCK after CS goes low. If the clock line is shared, the user can assert the HOLD input and place the device into a Hold mode. After releasing the HOLD pin, the operation will resume from the point where it was held. The following table contains the possible instructions and formats. All instructions, addresses and data are transferred MSB first and LSB last.
Instruction Set
Instruction READ WRITE RDSR WRSR Instruction Format 0000 0011 0000 0010 0000 0101 0000 0001 Description Read data from memory starting at selected address Write data to memory starting at selected address Read status register Write status register
Rev. 9 | Page 6 of 15 | www.onsemi.com
N25S0818HA
READ Operations
The serial SRAM READ is selected by enabling CS low. First, the 8-bit READ instruction is transmitted to the device followed by the 16-bit address with the MSB being a don't care. After the READ instruction and addresses are sent, the data stored at that address in memory is shifted out on the SO pin after the output valid time from the clock edge. If operating in page mode, after the initial word of data is shifted out, the data stored at the next memory location on the page can be read sequentially by continuing to provide clock pulses. The internal address pointer is automatically incremented to the next higher address on the page after each word of data is read out. This can be continued for the entire page length of 32 words long. At the end of the page, the addresses pointer will be wrapped to the 0 word address within the page and the operation can be continuously looped over the 32 words of the same page. If operating in burst mode, after the initial word of data is shifted out, the data stored at the next memory location can be read sequentially by continuing to provide clock pulses. The internal address pointer is automatically incremented to the next higher address after each word of data is read out. This can be continued for the entire array and when the highest address is reached (7FFFh), the address counter wraps to the address 0000h. This allows the burst read cycle to be continued indefinitely. All READ operations are terminated by pulling CS high.
Word READ Sequence
CS
SCK
0
1
2
3
4
5
6
7
8
9
10
11
21
22
23
24
25
26
27
28
29
30
31
Instruction SI 0 0 0 0 0 0 1 1 15 14
16-bit address 13 12 2 1 0 Data Out
SO
High-Z
7
6
5
4
3
2
1
0
Rev. 9 | Page 7 of 15 | www.onsemi.com
N25S0818HA
Page and Burst READ Sequence
CS
SCK
0
1
2
3
4
5
6
7
8
9
10
11
21
22
23
24
25
26
27
28
29
30
31
Instruction SI 0 0 0 0 0 0 1 1 15 14
16-bit address 13 12 2 1 0 Don't Care
ADDR 1 Data Out from ADDR 1 SO High-Z 7 6 5 4 3 2 1 0
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
Don't Care Data Out from ADDR 2 7 6 5 4 3 2 1 0 7 Data Out from ADDR 3 6 5 4 3 2 1 0 ... 7 Data Out from ADDR n 6 5 4 3 2 1 0
Page READ Sequence
SI 16-bit address Page address (X) Word address (Y) SO Page X Word Y Page X Page X Page X Word 31 Page X Word 0 Page X Word 1 Data Words: sequential, at the end of the page the address wraps back to the beginning of the page
Word Y+1 Word Y+2
Burst READ Sequence
SI 16-bit address Page address (X) Word address (Y) SO Page X Word Y Page X Word Y+1 Data Words: sequential, at the end of the page the address wraps to the beginning of the page and continues incrementing up to the starting word address. At that time, the address increments to the next page and the burst continues.
...
Page X Word 31 Page X Word 0 Page X Word 1
...
Page X Page X+1 Page X+1 Word Y+1 Word Y-1 Word Y
Rev. 9 | Page 8 of 15 | www.onsemi.com
N25S0818HA
WRITE Operations
The serial SRAM WRITE is selected by enabling CS low. First, the 8-bit WRITE instruction is transmitted to the device followed by the 16-bit address with the MSB being a don't care. After the WRITE instruction and addresses are sent, the data to be stored in memory is shifted in on the SI pin. If operating in page mode, after the initial word of data is shifted in, additional data words can be written as long as the address requested is sequential on the same page. Simply write the data on SI pin and continue to provide clock pulses. The internal address pointer is automatically incremented to the next higher address on the page after each word of data is written in. This can be continued for the entire page length of 32 words long. At the end of the page, the addresses pointer will be wrapped to the 0 word address within the page and the operation can be continuously looped over the 32 words of the same page. The new data will replace data already stored in the memory locations. If operating in burst mode, after the initial word of data is shifted in, additional data words can be written to the next sequential memory locations by continuing to provide clock pulses. The internal address pointer is automatically incremented to the next higher address after each word of data is read out. This can be continued for the entire array and when the highest address is reached (7FFFh), the address counter wraps to the address 0000h. This allows the burst write cycle to be continued indefinitely. Again, the new data will replace data already stored in the memory locations. All WRITE operations are terminated by pulling CS high.
Word WRITE Sequence
CS
SCK
0
1
2
3
4
5
6
7
8
9
10
11
21
22
23
24
25
26
27
28
29
30
31
Instruction SI 0 0 0 0 0 0 1 0 15 14
16-bit address 13 12 ... 2 1 0 7 6
Data In 5 4 3 2 1 0
SO
High-Z
Rev. 9 | Page 9 of 15 | www.onsemi.com
N25S0818HA
Page and Burst WRITE Sequence
CS
SCK
0
1
2
3
4
5
6
7
8
9
10
11
21
22
23
24
25
26
27
28
29
30
31
Instruction SI 0 0 0 0 0 0 1 0 15 14
16-bit address 13 12 2 1 0 7 6 5 4 3 2 1 0
ADDR 1 SO High-Z
Data In to ADDR 1
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47 Data In to ADDR n
Data In to ADDR 2 7 6 5 4 3 2 1 0 7
Data In to ADDR 3 6 5 4 3 2 1 0 ... 7
6
5
4
3
2
1
0
High-Z
Page WRITE Sequence
Data Words: sequential, at the end of the page the address wraps back to the beginning of the page SI 16-bit address Page address (X) Word address (Y) SO Page X Word Y Page X Page X Page X Word 31 Page X Word 0 Page X Word 1
Word Y+1 Word Y+2 High-Z
Burst WRITE Sequence
SI 16-bit address Page address (X) Word address (Y) Page X Word Y Page X Word Y+1
...
Page X Word 31 Page X Word 0 Page X Word 1
...
Page X Page X+1 Page X+1 Word Y+1 Word Y-1 Word Y
Data Words: sequential, at the end of the page the address wraps to the beginning of the page and continues incrementing up to the starting word address. At that time, the address increments to the next page and the burst continues. SO High-Z
Rev. 9 | Page 10 of 15 | www.onsemi.com
N25S0818HA
WRITE Status Register Instruction (WRSR)
This instruction provides the ability to write the status register and select among several operating modes. Several of the register bits must be set to a low `0' if any of the other bits are written. The timing sequence to write to the status register is shown below, followed by the organization of the status register.
WRITE Status Register Sequence
CS
SCK 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Instruction SI 0 0 0 0 0 0 0 1 7 6 Status Register Data In 5 4 3 2 1 0
SO
High-Z
Status Register
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Mode 0 0 = Word Mode (Default) 1 0 = Page Mode 0 1 = Burst Mode 1 1 = Reserved
Reserved Must = 0
Reserved Must = 0
Hold Function 0 = Hold (Default) 1 = No Hold
Rev. 9 | Page 11 of 15 | www.onsemi.com
N25S0818HA
READ Status Register Instruction (RDSR)
This instruction provides the ability to read the Status register. The register may be read at any time by performing the following timing sequence.
READ Status Register Instruction (RDSR)
CS
SCK 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Instruction SI 0 0 0 0 0 1 0 1 Status Register Data Out SO High-Z 7 6 5 4 3 2 1 0
Power-Up State
The serial SRAM enters a know state at power-up time. The device is in low-power standby state with CS = 1. A low level on CS is required to enter a active state.
Rev. 9 | Page 12 of 15 | www.onsemi.com
N25S0818HA
8-Lead Plastic Small Outline, 150mil SOIC
E E1
p D
B A2 h 45o A1 A
L
c
Parameter Pin Pitch Overall height Molded Package Thickness Standoff Overall Width Molded Package Width Overall Length Chamfer Distance Foot Length Foot Angle Lead Thickness Lead Width Mold Draft Angle Top Mold Draft Angle Bottom
Sym p A A2 A1 E E1 D h L
Min 1.35 1.32 0.10 5.79 3.71 4.80 0.25 0.48 0 0.20 0.33 0 0
Nom 1.27 1.55 1.42 0.18 6.02 3.91 4.90 0.38 0.62 4 0.23 0.42 12 12
Max 1.75 1.55 0.25 6.20 3.99 5.00 0.51 0.76 8 0.25 0.51 15 15
c B

Note: 1. All dimensions in Millimeters 2. Package dimensions exclude mold flash and protusions.
Rev. 9 | Page 13 of 15 | www.onsemi.com
N25S0818HA
8-Lead Plastic Thin Shrink Small Outline, 4.4 mm TSSOP
E E1 p D B
A2
A1
A
L
c
Parameter Pin Pitch Overall height Molded Package Thickness Standoff Overall Width Molded Package Width Overall Length Foot Length Foot Angle Lead Thickness Lead Width Mold Draft Angle Top Mold Draft Angle Bottom
Sym p A A2 A1 E E1 D L
Min
Nom 0.65
Max 1.10
0.85 0.05 6.25 4.30 2.90 0.50 0 0.09 0.19 0 0
0.90 0.10 6.38 4.40 3.00 0.60 4 0.15 0.25 5 5
0.95 0.15 6.50 4.50 3.10 0.70 8 0.20 0.30 10 10
c B

Note: 1. All dimensions in Millimeters 2. Package dimensions exclude mold flash and protusions.
Rev. 9 | Page 14 of 15 | www.onsemi.com
N25S0818HA
Ordering Information
Part Number N25S818HAS21I N25S818HAT21I N25S818HAS21IT N25S818HAT21IT Power Supply 1.8V 1.8V 1.8V 1.8V Package 8-Pin SOIC (RoHS Compliant) 8-Pin TSSOP (RoHS Compliant) 8-Pin SOIC (RoHS Compliant) 8-Pin TSSOP (RoHS Compliant) Shipping Method Tray Tray Tape & Reel Tape & Reel
Revision History
Revision # A B C D E F G H 9 Date October 2005 January 2006 January 2006 January 2006 September 2006 May 2007 October 2007 January 2008 July 2008 Initial advance release Separated density, removed write protection and added page and burst modes Changed packages to green type Changed TSSOP pinout to match SOIC Split x8 and x16 devices Converted to AMI Semiconductor Updated DC parameters Maximum frequency changed to 16MHz for 1.8V device Removed ADVANCE from datasheet Changed AMIS address Converted to ON Semiconductor and new part numbers Change Description
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor PO Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: orderlit@onsemi.com N. American Technical Support: 800-282-9855 Toll Free USA/Canada Europe, Middle East & Africa Technical Support: Phone 421-33-790-2910 Japan Customer Focus Center: Phone 81-3-5773-3850 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative
Rev. 9 | Page 15 of 15 | www.onsemi.com

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