ASYNCHRONOUS
SRAM 256K x 16 SRAM
+5V SUPPLY
REVOLUTIONARY PINOUT
GVT72256A16
REVOLUTIONARY PINOUT 256K X 16
GALVANTECH, INC.
Galvantech, Inc. reserves the right to change
products or specifications without notice.
Rev. 7/99
Galvantech, Inc. 3080 Oakmead Village Drive, Santa Clara, CA 95051
Tel (408) 566-0688 Fax (408) 566-0699Web Site http://www.galvantech.com
FEATURES
•Fast access times: 10, 12, and 15ns
•Fast OE# access times: 5, 6, and 7ns
•Single +5V +10% power supply
•Fully static -- no clock or timing strobes necessary
•All inputs and outputs are TTL-compatible
•Three state outputs
•Center power and ground pins for greater noise immunity
•Easy memory expansion with CE# and OE# options
•Automatic CE# power down
•High-performance, low-power consumption, CMOS
double-poly, double-metal process
•Packaged in 44-pin, 400-mil SOJ and 44-pin, 400-mil
TSOP
OPTIONSMARKING
•Timing
10ns access -10
12ns access -12
15ns access -15
•Packages
44-pin SOJ (400 mil) J
44-pin TSOP (400 mil) TS
•Power consumption
Standard None
Low L
•Temperature
Commercial None (0°C to 70°C)
Industrial I (-40°C to 85°C)
GENERAL DESCRIPTION
The GVT72256A16 is organized as a 262,144 x 16
SRAM using a four-transistor memory cell with a high
performance, silicon gate, low-power CMOS process.
Galvantech SRAMs are fabricated using double-layer
polysilicon, double-layer metal technology.
This device offers center power and ground pins for
improved performance and noise immunity. Static design
eliminates the need for external clocks or timing strobes. For
increased system flexibility and eliminating bus contention
problems, this device offers chip enable (CE#), separate byte
enable controls (BLE# and BHE#) and output enable (OE#)
with this organization.
The device offers a low power standby mode when chip
is not selected. This allows system designers to meet low
standby power requirements.
1
2
3
4
5
6
7
8
9
10
32
31
30
29
28
27
26
25
24
23
19
20
21
11
12
13
14
15
16
22
18
17
A16
A15
DQ12
DQ11
NC
A14
A13
A12
A11
OE#
BHE#
DQ16
DQ15
VSS
VCC
A2
A3
DQ3
DQ4
WE#
A5
A6
A7
A8
A4
CE#
DQ1
DQ2
VCC
VSS
A17
A1
PIN ASSIGNMENT
44-Pin SOJ
44-Pin TSOP
33
34
35
36
A0
A9 A10
BLE#
41
42
43
44
37
38
39
40
DQ7
DQ8
DQ5
DQ6 DQ10
DQ9
DQ14
DQ13