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參數(shù)資料
| 型號： | CYM1946 |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | 512K x 32 Static RAM Module(512K x 32 靜態(tài)RAM模塊) |
| 中文描述： | 512k × 32的靜態(tài)RAM模塊（512k × 32的靜態(tài)內(nèi)存模塊） |
| 文件頁數(shù)： | 1/6頁 |
| 文件大?。?/td> | 158K |
| 代理商： | CYM1946 |
512K x 32 Static RAM Module
fax id: 2045
CYM1946
Cypress Semiconductor Corporation
3901 North First Street
San Jose
CA 95134
December 2, 1997
408-943-2600
Features
High-density 16-megabit SRAM module
32-bit Standard Footprint supports densities from 16K
x 32 through 1M x 32
High-speed SRAMs
—Access time of 35 ns
Low active power
—7.3W (max.) at 35ns
Compatible with CYM1821, CYM1831, CYM1836,
CYM1841, and CYM1851 JDEC Modules
Functional Description
The CYM1946 is a high-performance 16-megabit static RAM
module organized as 512K words by 32 bits. This module is
constructed from 16 128K x 8 SRAMs in SOJ packages
mounted on an epoxy laminate substrate. Four chip selects
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.
The CYM1946 is designed for use with standard 72-pin SIMM
sockets. The pinout is downward compatible with the 64-pin
JEDEC ZIP/SIMM module family (CYM1821, CYM1831,
CYM1836, and CYM1841). Thus, a single motherboard de-
sign can be used to accommodate memory depth ranging from
16K words (CYM1821) to 1,024K words (CYM1851).
Presence detect pins (PD
0
–PD
3
) are used to identify module
memory density in applications where modules with alternate
word depths can be interchanged.
Logic Block Diagram
Pin Configuration
A
0
–A
16
1946–2
OE
WE
I/O
0
- I/O
7
CS
1
A
17
A
18
17
8
PD
0
- OPEN
PD
1
- OPEN
PD
2
- GND
PD
3
- OPEN
128Kx8
SRAM
ZIP/SIMM
Top View
NC
PD
3
PD
0
I/O
0
I/O
1
I/O
2
I/O
3
V
CC
7
A
8
A
9
I/O
4
I/O
5
A
4
A
5
PD
GND
PD
1
I/O
8
I/O
9
I/O
10
I/O
11
A
0
A
1
A
2
I/O
12
I/O
13
I/O
6
I/O
7
WE
A
14
CS
1
GND
A
15
CS
2
NC
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
62
64
66
68
70
72
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49
51
53
55
57
59
61
63
65
67
69
71
CS
3
A
GND
I/O
16
I/O
17
I/O
18
I/O
19
A
10
A
11
A
12
A
13
I/O
20
I/O
21
I/O
22
I/O
23
GND
NC
I/O
14
I/O
15
CS
4
A
17
OE
I/O
24
I/O
25
I/O
26
I/O
27
A
3
V
CC
A
6
I/O
28
I/O
29
I/O
30
I/O
31
A
18
NC
NC
128Kx8
SRAM
128Kx8
SRAM
128Kx8
SRAM
A
0
–A
16
I/O
8
- I/O
15
CS
2
17
8
128Kx8
SRAM
128Kx8
SRAM
128Kx8
SRAM
128Kx8
SRAM
A
0
–A
16
I/O
16
- I/O
23
CS
3
A
17
17
8
128Kx8
SRAM
128Kx8
SRAM
128Kx8
SRAM
128Kx8
SRAM
A
0
–A
16
I/O
24
- I/O
31
CS
4
A
17
17
8
128Kx8
SRAM
128Kx8
SRAM
128Kx8
SRAM
128Kx8
SRAM
1–4
De-
coder
1–4
De-
coder
1–4
De-
coder
1–4
De-
coder
A
18
A
18
A
18
A
17
1946–1
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