CY7C187-25PC Datasheet Download

Part No.:
CY7C187-25PC
Download:
Download Datasheet
Description:
[64K x 1 Static RAM]
File Size:
145 K
Page:
9 Pages
Logo:
Manufacturer:
CYPRESS [ CYPRESS SEMICONDUCTOR ]
PCB Prototype
 CY7C187-25PC Datasheet Page:2CY7C187-25PC Datasheet Page:3CY7C187-25PC Datasheet Page:4CY7C187-25PC Datasheet Page:5CY7C187-25PC Datasheet Page:6CY7C187-25PC Datasheet Page:7CY7C187-25PC Datasheet Page:8CY7C187-25PC Datasheet Page:9 
87
CY7C187
64K x 1 Static RAM
Features
• High speed
— 15 ns
• CMOS for optimum speed/power
• Low active power
— 495 mW
• Low standby power
— 220 mW
• TTL compatible inputs and outputs
• Automatic power-down when deselected
vided by an active LOW Chip Enable (CE) and three-state driv-
ers. The CY7C187 has an automatic power-down feature,
reducing the power consumption by 56% when deselected.
Writing to the device is accomplished when the Chip Enable
(CE) and Write Enable (WE) inputs are both LOW. Data on the
input pin (D
IN
) is written into the memory location specified on
the address pins (A
0
through A
15
).
Reading the device is accomplished by taking the Chip Enable
(CE) LOW, while Write Enable (WE) remains HIGH. Under
these conditions, the contents of the memory location speci-
fied on the address pin will appear on the data output (D
OUT
)
pin.
The output pin stays in high-impedance state when Chip En-
able (CE) is HIGH or Write Enable (WE) is LOW.
The CY7C187 utilizes a die coat to insure alpha immunity.
Functional Description
The CY7C187 is a high-performance CMOS static RAM orga-
nized as 65,536 words x 1 bit. Easy memory expansion is pro-
Logic Block Diagram
Pin Configurations
DI
INPUT BUFFER
A
0
A
1
A
2
A
3
A
4
A
5
NC
A
6
A
7
D
OUT
WE
GND
SOJ
Top View
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
V
CC
A
15
A
14
A
13
A
12
NC
A
11
A
10
A
9
A
8
D
IN
CE
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
D
OUT
WE
GND
DIP
Top View
1
2
3
4
5
6
7
8
9
10
11
22
21
20
19
18
17
16
15
14
13
12
V
CC
A
15
A
14
A
13
A
12
A
11
A
10
A
9
A
8
D
IN
CE
A
12
A
13
A
14
A
15
A
0
A
1
A
2
A
3
ROW DECODER
256 x 256
ARRAY
SENSE AMPS
DO
C187–3
C187–2
CE
COLUMN DECODER
POWER
DOWN
WE
A
4
A
5
A
6
A
7
A
8
A
9
A
10
A
11
C187–1
Selection Guide
[1]
7C187-15
Maximum Access Time (ns)
Maximum Operating Current (mA)
Maximum Standby Current (mA)
Note:
1. For military specifications, see the CY7C187A datasheet.
7C187-20
20
80
40/20
7C187-25
25
70
20/20
7C187-35
35
70
20/20
15
90
40/20
Cypress Semiconductor Corporation
Document #: 38-05044 Rev. **
3901 North First Street
San Jose
CA 95134 • 408-943-2600
Revised August 24, 2001