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參數(shù)資料
| 型號： | CYM1838 |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | 128K x 32 Static RAM Module(128K x 32 靜態(tài)RAM模塊) |
| 中文描述： | 128K的× 32靜態(tài)RAM模塊（128K的× 32靜態(tài)內(nèi)存模塊） |
| 文件頁數(shù)： | 1/6頁 |
| 文件大?。?/td> | 244K |
| 代理商： | CYM1838 |
PRELIMINARY
128K x 32 Static RAM Module
fax id: 2015
CYM1838
Cypress Semiconductor Corporation
3901 North First Street
San Jose
CA 95134
July 1992 – Revised May 16, 1997
408-943-2600
1CYM1838
Features
High-density 4-megabit SRAM module
High-speed CMOS SRAMs
—Access time of 20 ns
66-pin, 1.1-inch-square PGA package
Low active power
—4.0W (max.)
Hermetic SMD technology
TTL-compatible inputs and outputs
Commercial and military temperature ranges
Functional Description
The CYM1838 is a very high performance 4-megabit static
RAM module organized as 128K words by 32 bits. The module
is constructed using four 128K x 8 static RAMs mounted onto
a multilayer ceramic substrate. Four chip selects (CS
1
, CS
2
,
CS
3
, CS
4
) are used to independently enable the four bytes.
Reading or writing can be executed on individual bytes or any
combination of multiple bytes through proper use of selects.
Writing to each byte is accomplished when the appropriate
chip selects (CS) and write enable (WE) inputs are both
LOW.Data on the input/output pins (I/O
X
) is written into the
memory location specified on the address pins (A
0
through
A
16
).
Reading the device is accomplished by taking chip selects
LOW while write enable remains HIGH. Under these condi-
tions, the contents of the memory location specified on the
address pins will appear on the data input/output pins.
The data input/output pins remain in a high-impedance state
when write enable is LOW or the appropriate chip selects are
HIGH.
Logic Block Diagram
Pin Configuration
1838–1
1838–2
17
128K x 8
SRAM
8
SRAM
8
SRAM
8
SRAM
8
A
0
A
16
OE
WE
1
CS
1
WE
2
CS
2
WE
3
CS
3
WE
4
CS
4
I/O
0
7
I/O
8
15
I/O
16
23
I/O
24
31
I/O
8
I/O
9
I/O
10
A
13
A
14
A
15
A
16
GND
I/O
0
I/O
1
I/O
2
WE
2
CS
2
GND
I/O
11
A
10
A
11
A
12
V
CC
CS
1
GND
I/O
3
I/O
15
I/O
14
I/O
13
I/O
12
OE
GND
WE
1
I/O
7
I/O
6
I/O
5
I/O
4
I/O
24
I/O
25
I/O
26
A
6
A
7
GND
A
8
A
9
I/O
16
I/O
17
I/O
18
V
CC
CS
4
WE
4
I/O
27
A
3
A
4
A
5
WE
3
CS
3
GND
I/O
19
I/O
31
I/O
30
I/O
29
I/O
28
A
0
A
1
A
2
I/O
23
I/O
22
I/O
21
I/O
20
1
12
23
34
45
56
11
22
33
44
55
66
128K x 8
128K x 8
128K x 8
PGA
Top View
Selection Guide
1838-20
20
720
720
240
240
1838-25
25
720
720
240
240
1838-35
35
Maximum Access Time (ns)
Maximum Operating Current (mA)
Commercial
Military
Commercial
Military
720
Maximum Standby Current (mA)
240
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