AS7C164-20 View Datasheet(PDF) - Alliance Semiconductor
Part Name
Description
Manufacturer
AS7C164-20 Datasheet PDF : 8 Pages
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The AS7C164 is a high performance CMOS 65,536-bit Static Random Access Memory (SRAM) device organized as 8,192 words × 8 bits. It
is designed for memory applications where fast data access, low power, and simple interfacing are desired.
Equal address access and cycle times (tAA, tRC, tWC) of 12/15/20 ns with output enable access times (tOE) of 3/4/5 ns are ideal for high
performance applications. Active high and low chip enables ( CE1, CE2) permit easy memory expansion with multiple-bank memory
systems.
When CE1 is High or CE2 is Low the device enters standby mode. The standard AS7C164 is guaranteed not to exceed 11.0 mW power
consumption in standby mode, and typically requires only 250 µW; it offers 2.0V data retention with maximum power of 120 µW.
A write cycle is accomplished by asserting write enable (WE) and both chip enables (CE1, CE2). Data on the input pins I/O0-I/O7 is written
on the rising edge of WE (write cycle 1) or the active-to-inactive edge of CE1 or CE2 (write cycle 2). To avoid bus contention, external
devices should drive I/O pins only after outputs have been disabled with output enable (OE) or write enable (WE).
A read cycle is accomplished by asserting output enable (OE) and both chip enables (CE1, CE2), with write enable (WE) High. The chip
drives I/O pins with the data word referenced by the input address. When either chip enable or output enable is inactive, or wri te enable is
active, output drivers stay in high-impedance mode.
All chip inputs and outputs are TTL-compatible, and operation is from a single 5V supply. The AS7C164 is packaged in all high vo lume
industry standard packages.
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Parameter
Device
Symbol Min
Max
Unit
Voltage on VCC relative to GND
AS7C164
Vt1
–0.50
+7.0
V
Voltage on any pin relative to GND
Vt2
–0.50
VCC + 0.50
V
Power dissipation
Storage temperature (plastic)
Ambient temperature with VCC applied
PD
–
Tstg
–65
Tbias
–55
1.0
W
+150
oC
+125
oC
DC current into outputs (low)
Iout
–
20
mA
NOTE: Stresses greater than those listed under Absolute Maximum Ratings 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 outside those indicated in the operational sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect reliability.
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CE1
CE2
WE
OE
H
X
X
X
X
L
X
X
L
H
H
H
L
H
H
L
L
H
L
X
Key: X = Don’t Care, L = Low, H = High
Data
High Z
High Z
High Z
Dout
Din
Mode
Standby (ISB, ISB1)
Standby (ISB, ISB1)
Output disable (ICC)
Read (ICC)
Write (ICC)
57
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