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Part: S29255A
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Datasheet: Download S29255A datasheet File size : 354 kB
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Contents
Features .. 1 Pin Assignment ...... 1 Block Diagram........ 1 Instruction Set ........ 2 Absolute Maximum Ratings ..... 2 Recommended Operating Conditions..... 2 Rewriting Times ..... 2 Pin Capacitance..... 3 DC Electrical Characteristics ... 3 AC Electrical Characteristics.... 4 Operation ......... 5 Three-wire Interface ·DI-DO Direct Connecting .... 8 Dimensions ...... 8 Ordering Information ....... 9 Characteristics ..... 10
CMOS 2K/4K-bit SERIAL E2PROM
S-29255A/29355A
2
The S-29255A (2K-bit) and S-29355A (4K-bit) are E PROMs characterized by a wide operating voltage range and low power consumption. The organization is 128-word×16-bit and 256-word×16bit, respectively. They are easily interfaced with a serial port because the instruction is composed of eight-bit units. Also, through the RESET pin, erroneous writing at power on/off can be avoided.
Features
· S-29255A : S-29355A : 2K-bit, instruction code conforming to M6M80021 4K-bit, instruction code conforming to M6M80041 · · · · · · Easy interface with serial port Memory protection by RESET pin Rewritings: 105 times/word Data retention: 10 years Operating temperature: -40 °C to+85 °C Package: 8-pin DIP/SOP, bare chip
· Low power consumption Operating: 2.0 mA max. Standby: 1.0 µA max. · Wide operating voltage range Write: 2.7 to 6.5 V Read: 1.8 to 6.5 V
Pin Assignment
8-pin DIP Top view CS SK DI DO VCC RDY/BUSY RESET GND RDY/BUSY VCC CS SK 8-pin SOP Top view RESET GND DO DI CS SK DI DO VCC GND RDY/BUSY RESET Chip select Serial clock Serial data input Serial data output Power supply voltage Ground Ready output/Busy output Reset input L : Stable Status H : Reset write circuit (Memory protection)
Figure 1
Block Diagram
RESET Write protection Memory array Address decoder
DI CS Clock generator
Data register
Output buffer
DO
Mode decode logic RDY/BUSY Figure 2
VCC GND
SK
Seiko Instruments Inc.
1
CMOS 2K/4K-bit SERIAL E2PROM S-29255A/29355A
Instruction Set
Table 1 Instruction Op code Address S-29255A READ (Read data) PROGRAM (Program) WRAL (Write all )* ERAL (Erase all )* EWEN (Program enable) EWDS (Program disable) Status output Busy flag Write permission ECC flag 10101000 10100100 10100001 10100010 10100011 10100000 10101001 A0 to A6 0 A0 to A6 0 A0 to A6 0 xxxxxxxx xxxxxxxx xxxxxxxx 00xxxxxx 10xxxxxx 01xxxxxx S-29355A A0 to A7 A0 to A7 A0 to A7 xxxxxxxx xxxxxxxx xxxxxxxx 00xxxxxx 10xxxxxx 01xxxxxx D0 to D15 D0 to D15 D0 to D15 0 : BUSY 1 : READY 0 : Permission 1 : Inhibit "0" is always output** Data
x : Doesn't matter * : ERAL and WRAL are options. Normally these can not be used. ** : S-29255A/29355A doesn't have redundant memory.
Absolute Maximum Ratings
Table 2 Parameter Power supply voltage Input voltage Output voltage Storage temperature under bias Storage temperature Symbol VCC VIN VOUT T bias T stg Ratings -0.3 to +7.0 -0.3 to VCC+0.3 -0.3 to VCC -50 to+95 -65 to+150 Unit V V V °C °C
Recommended Operating Conditions
Parameter Power supply voltage High level input voltage Symbol VCC VIH Read Write VCC=2.7 to 6.5V
Table 3
Conditions
Min. 1.8 2.7 0.8×VCC 0.7×VCC 0.8×VCC 0.0 0.0 0.0 -40
Typ.
Max. 6.5 6.5 VCC VCC VCC 0.2×VCC 0.3×VCC 0.2×VCC +85
Unit V V V V V V V V °C
Low level input voltage
VIL
CS, SK DI, RESET VCC=1.8 to 2.7V VCC=2.7 CS, SK to 6.5V DI, RESET VCC=1.8 to 2.7V
Operating temperature
T opr
Rewriting Times
Table 4 Parameter Rewriting times Symbol NW Min. 10
5
(Ta=-40°C to 85°C) Typ. Max. Unit times/word
2
Seiko Instruments Inc.
Others parts begin by s2
S2-1 S2-2 S2-3 S2-4 S2-5 S2-6 S2-7
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