CY7C197-45VC Cypress Semiconductor Corporation., CY7C197-45VC Datasheet

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CY7C197-45VC

Manufacturer Part Number
CY7C197-45VC
Description
256Kx1 Static RAM
Manufacturer
Cypress Semiconductor Corporation.
Datasheet

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Features
Functional Description
The CY7C197 is a high-performance CMOS static RAM orga-
nized as 256K words by 1 bit. Easy memory expansion is pro-
Selection Guide
Cypress Semiconductor Corporation
Maximum Access Time (ns)
Maximum Operating Current (mA)
Maximum Standby Current (mA)
• High speed
• CMOS for optimum speed/power
• Low active power
• Low standby power
• TTL-compatible inputs and outputs
• Automatic power-down when deselected
Logic Block Diagram
— 12 ns
— 880 mW
— 220 mW
A
A
A
A
A
A
A
A
A
A
13
14
15
16
17
0
1
2
3
4
A
5
A
6
A
7
INPUT BUFFER
DECODER
COLUMN
A
1024 x 256
8
ARRAY
A
9
A
10
A
11
A
12
POWER
DOWN
7C197-12
150
12
30
3901 North First Street
7C197-15
DI
DO
C197-1
CE
WE
140
15
30
vided by an active LOW Chip Enable (CE) and three-state driv-
ers. The CY7C197 has an automatic power-down feature,
reducing the power consumption by 75% 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
the address pins (A
Reading the device is accomplished by taking chip enable
(CE) LOW while Write Enable (WE) remains HIGH. Under
these conditions the contents of the memory location specified
on the address pins will appear on the data output (D
The output pin stays in a high-impedance state when Chip
Enable (CE) is HIGH or Write Enable (WE) is LOW.
The CY7C197 utilizes a die coat to insure alpha immunity.
Pin Configurations
D
GND
OUT
WE
7C197-20
A
A
A
A
A
A
A
A
A
0
1
2
3
4
5
6
7
8
135
20
30
1
2
3
4
5
6
7
8
9
10
11
12
DIP/SOJ
Top View
IN
San Jose
7C197
) is written into the memory location specified on
13
24
23
22
21
20
19
18
17
16
15
14
0
7C197-25
C197-2
through A
A
V
A
A
A
A
A
A
A
A
D
CE
12
CC
17
16
15
14
13
11
10
9
IN
256Kx1 Static RAM
25
95
30
CA 95134
17
D
OUT
).
NC
NC
A
A
A
A
A
A
3
4
5
6
7
8
7C197-35
4
5
6
7
8
9
10
11
12
35
95
30
1314151617
Top View
3 2 1
7C197
LCC
28
CY7C197
October 4, 1999
27
26
25
24
23
22
21
20
19
18
408-943-2600
7C197-45
A
C197-3
NC
A
A
A
A
A
A
NC
12
16
15
14
13
11
10
OUT
45
30
) pin.

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CY7C197-45VC Summary of contents

Page 1

... The output pin stays in a high-impedance state when Chip Enable (CE) is HIGH or Write Enable (WE) is LOW. The CY7C197 utilizes a die coat to insure alpha immunity. Pin Configurations DI DIP/SOJ ...

Page 2

... MAX RC Max > > < MAX Max > V 0.3V > < 0. power-up, otherwise CY7C197 [1] 0. 0.5V CC Ambient Temperature + 10% 7C197-12 7C197-15 Min. Max. Min. Max. 2.4 2.4 0.4 0.4 2 0.3V +0.3V 0.5 0.8 0.5 0.8 ...

Page 3

... CE > V 0.3V > < 0. Test Conditions MHz 5.0V CC [5] R1 329 5V 3. GND 255 (255 MIL) JIG AND SCOPE C197-4 (b) 1.90V 3 CY7C197 7C197-20 7C197-25, 35, 45 Min. Max. Min. Max. Unit 2.4 2.4 V 0.4 0.4 V 2 0.3V + 0.3V 0.5 0.8 0.5 0 ...

Page 4

... less than t and t is less than t HZCE LZCE HZWE LZWE 4 CY7C197 7C197-35 7C197-45 Unit ...

Page 5

... Device is continuously selected OHA t RC ACE DATA VALID 50% [ SCE PWE t SD DATA VALID t HZWE DATA UNDEFINED 5 CY7C197 DATA VALID C197-6 t HZCE HIGH IMPEDANCE t PD ICC 50% ISB C197 LZWE HIGH IMPEDANCE C197-8 ...

Page 6

... Switching Waveforms (continued) [9, 12] Write Cycle No. 2 (CE Controlled) ADDRESS DATA IN DATA OUT Note: 12 goes HIGH simultaneously with WE HIGH, the output remains in a high-impedance state SCE PWE DATA VALID HIGH IMPEDANCE 6 CY7C197 C197-9 ...

Page 7

... AMBIENT TEMPERATURE(°C) TYPICAL ACCESS TIME CHANGE vs. OUTPUT LOADING 30.0 25.0 20.0 15.0 V =4.5V 10 =25°C A 5.0 0.0 5.0 0 200 400 600 800 CAPACITANCE (pF) 7 CY7C197 OUTPUT SOURCE CURRENT vs. OUTPUT VOLTAGE 120 100 80 V =5. =25° 0.0 1.0 2.0 3.0 OUTPUT VOLTAGE(V) OUTPUT SINK CURRENT vs. OUTPUT VOLTAGE 140 ...

Page 8

... CY7C197-12PC CY7C197-12VC 15 CY7C197-15PC CY7C197-15VC 20 CY7C197-20PC CY7C197-20VC 25 CY7C197-25PC CY7C197-25VC 35 CY7C197-35PC CY7C197-35VC 45 CY7C197-45PC CY7C197-45VC Document #: 38 00078 M Input/Output Deselect/Power-Down Read Write Package Name Package Type P13 24-Lead (300-Mil) Molded DIP V13 24-Lead Molded SOJ P13 24-Lead (300-Mil) Molded DIP V13 24-Lead Molded SOJ P13 ...

Page 9

Package Diagrams 24-Lead (300-Mil) Molded DIP P13/P13A 24-Lead (300-Mil) Molded SOJ V13 51-85013-A 51-85030-A ...

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