CY7C128A_07 Datasheet, PDF (1/10 Pages) Cypress Semiconductor – 2K x 8 Static RAM

CY7C128A
2K x 8 Static RAM
Features
• Automatic power-down when deselected
• CMOS for optimum speed/power
• High speed
— 15 ns
• Low active power
— 660 mW (commercial)
— 688 mW (military—20 ns)
• Low standby power
— 110 mW (20 ns)
• TTL-compatible inputs and outputs
• Capable of withstanding greater than 2001V electro-
static discharge
• V_IH of 2.2V
Functional Description
The CY7C128A is a high-performance CMOS static RAM or-
ganized as 2048 words by 8 bits. Easy memory expansion is
provided by an active LOW Chip Enable (CE), and active LOW
Output Enable (OE) and three-state drivers. The CY7C128A
has an automatic power-down feature, reducing the power
consumption by 83% when deselected.
Writing to the device is accomplished when the Chip Enable
(CE) and Write Enable (WE) inputs are both LOW.
Data on the eight I/O pins (I/O₀ through I/O₇) is written into the
memory location specified on the address pins (A₀ through
A₁₀).
Reading the device is accomplished by taking Chip Enable
(CE) and Output Enable (OE) 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 eight I/O pins.
The I/O pins remain in high-impedance state when Chip En-
able (CE) or Output Enable (OE) is HIGH or Write Enable (WE)
is LOW.
The CY7C128A utilizes a die coat to insure alpha immunity.
Logic Block Diagram
Pin Configurations
DIP/SOJ/SOIC
Top View
A₁₀
A₉
A₈
A₇
A₆
A₅
A₄
CE
WE
OE
INPUT BUFFER
128 x 16 x 8
ARRAY
COLUMN
DECODER
POWER
DOWN
I/O₀
I/O₁
I/O₂
I/O₃
I/O₄
I/O₅
I/O₆
I/O₇
A₇ 1
24 VCC
A₆ 2
A₅ 3
A_{4 4}
23 A8
22 A9
21 WE
A_{3 5}
20 OE
A₂
A₁
6
19
7 ^7C128A18
A₁₀
CE
A₀ 8
I/O₀ 9
I/O₁ 10
I/O₂ 11
GND 12
17 I/O7
16 ^I/O6
15 ^I/O5
14 ^I/O4
13 I/O3
LCC
Top View
C128A–2
3 2 1 24 23
A₄ 4
A₃ 5
A₂ 6
22 A₉
21 WE
20 OE
A₁ 7 7C128A 19 A₁₀
A₀ 8
18 _CE
I/O₀ 9
17 _I/O7
I/O₁ 10
16 _I/O6
11 12 13 14 15
A₃ A₂ A₁ A₀
C128A–1
C128A–3
Selection Guide
Maximum Access Time (ns)
Maximum Operating
Current (mA)
Commercial
Military
Maximum Standby
Current (mA)
Commercial
Military
7C128A-15
15
120
-
40
-
7C128A-20
20
120
125
20
20
7C128A-25
25
120
125
20
20
7C128A-35
35
120
125
20
20
7C128A-45
45
120
125
20
20
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
Document #: 38-05028 Rev. **
Revised August 24, 2001