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M68AF031AL55NS1T Datasheet(PDF) 4 Page - STMicroelectronics

Part # M68AF031AL55NS1T
Description  256 Kbit (32K x 8) 5.0V Asynchronous SRAM
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M68AF031AL55NS1T Datasheet(HTML) 4 Page - STMicroelectronics

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M68AF031A
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SUMMARY DESCRIPTION
The M68AF031A is a 256 Kbit (262,144 bit) CMOS
SRAM, organized as 32,768 bytes. The device
features fully static operation requiring no external
clocks or timing strobes, with equal address ac-
cess and cycle times. It requires a single 4.5 to
5.5V supply. This device has an automatic power-
down feature, reducing the power consumption by
over 99% when deselected.
The M68AF031A is available in SO28 (28-lead
Small Outline), PDIP28 (28-pin Plastic Dual-In-
Line) and TSOP28 (28-lead Thin Small Outline,
Standard and Reverse Pinout) packages.
In addition to the standard version, the TSOP28
Standard package is also available in Lead-free
version (standard and Tape & Reel packing), in
compliance with JEDEC Std J-STD-020B, the ST
ECOPACK 7191395 Specification, and the RoHS
(Restriction of Hazardous Substances) directive. It
is also compliant with Lead-free soldering pro-
cesses.
Figure 2. Logic Diagram
Table 1. Signal Names
AI05920C
16
A0-A14
W
DQ0-DQ7
VCC
M68AF031A
G
8
E
VSS
A0-A14
Address Inputs
DQ0-DQ7
Data Input/Output
E
Chip Enable
G
Output Enable
W
Write Enable
VCC
Supply Voltage
VSS
Ground
NC
Not Connected Internally


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