33
CY7C1041AV33/
GVT73256A16
PRELIMINARY
256K x 16 Static RAM
Functional Description
Features
• Fast access times: 10, 12 ns
The CY7C1049AV33\GVT73512A8 is organized as a 262,144
x 16 SRAM using a four-transistor memory cell with a high-per-
formance, silicon gate, low-power CMOS process. Cypress
SRAMs are fabricated using double-layer polysilicon, dou-
ble-layer metal technology.
• Fast OE access times: 5, 6, and 7 ns
• Single +3.3V ±0.3V 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
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 sys-
tem flexibility and eliminating bus contention problems, this de-
vice offers Chip Enable (CE), separate Byte Enable controls
(BLE and BHE) and Output Enable (OE) with this organization.
• High-performance, low power consumption, CMOS
double-poly, double-metal process
• Packaged in 44-pin, 400-mil SOJ and 44-pin, 400-mil
TSOP
The device offers a low-power standby mode when chip is not
selected. This allows system designers to meet low standby
power requirements.
Functional Block Diagram
Pin Configuration
VCC
VSS
SOJ/TSOP II
Top View
BLE#
44
43
42
41
40
39
38
1
2
3
4
5
6
A
A
A
A
0
17
16
15
A
1
DQ1
DQ8
DQ9
DQ16
A
A0
2
A
OE
3
BHE
BLE
DQ
DQ
DQ
A
4
CE
DQ
DQ
DQ
7
1
16
MEMORY ARRAY
512 ROWS X 256 X 16
COLUMNS
37
36
35
34
33
8
2
3
15
14
13
9
10
11
12
13
DQ
DQ
4
V
V
SS
CC
V
V
SS
CC
32
31
30
29
28
27
DQ
DQ
DQ
DQ
DQ
12
11
5
6
7
8
DQ
14
15
16
DQ
DQ
NC
10
9
WE 17
18
A
14
A
5
19
26
25
A
A
A
A
6
13
12
11
A
20
21
22
A16
7
POWER
DOWN
CE#
BHE#
WE#
COLUMN DECODER
A
24
23
8
9
A
A
10
OE#
Selection Guide
CY7C1049AV33-10/ CY7C1049AV33-12/
GVT73512A8-10
GVT73512A8-12
Maximum Access Time (ns)
10
240
10
12
210
10
Maximum Operating Current (mA)
Maximum CMOS Standby Current (mA)
Com’l/Ind’l
Com’l
L
•
3.0
3.0
Cypress Semiconductor Corporation
•
3901 North First Street
San Jose
•
CA 95134
•
408-943-2600
June 15, 2000