cym1946 Cypress Semiconductor Corporation., cym1946 Datasheet

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cym1946

Manufacturer Part Number
cym1946
Description
512k Static Module
Manufacturer
Cypress Semiconductor Corporation.
Datasheet
Features
Functional Description
The CYM1946 is a high-performance 16-megabit static RAM
module organized as 512K words by 32 bits. This module is
Cypress Semiconductor Corporation
• High-density 16-megabit SRAM module
• 32-bit Standard Footprint supports densities from 16K
• High-speed SRAMs
• Low active power
• Compatible with CYM1821, CYM1831, CYM1836,
x 32 through 1M x 32
CYM1841, and CYM1851 JDEC Modules
— Access time of 35 ns
— 7.3W (max.) at 35ns
Logic Block Diagram
A
A
CS
A
CS
CS
A
CS
0
A
A
0
A
A
A
A
A
A
0
0
18
– A
17
18
18
– A
17
17
18
17
– A
1
2
3
– A
4
OE
WE
16
16
16
16
1–4
De-
coder
1–4
De-
coder
1–4
De-
coder
1–4
De-
coder
17
17
17
17
128Kx8
128Kx8
128Kx8
SRAM
SRAM
SRAM
128Kx8
SRAM
128Kx8
128Kx8
128Kx8
SRAM
SRAM
SRAM
128Kx8
SRAM
3901 North First Street
128Kx8
128Kx8
128Kx8
128Kx8
SRAM
SRAM
SRAM
SRAM
PD
PD
PD
PD
0
1
2
3
- OPEN
- OPEN
- GND
- OPEN
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
memory density in applications where modules with alternate
word depths can be interchanged.
128Kx8
512K x 32 Static RAM Module
128Kx8
SRAM
128Kx8
128Kx8
SRAM
SRAM
SRAM
8
8
8
8
I/O
I/O
I/O
I/O
San Jose
24
0
16
8
- I/O
- I/O
- I/O
- I/O
Pin Configuration
31
1946–1
7
15
23
0
–PD
CA 95134
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
GND
GND
CS
CS
3
PD
PD
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
V
NC
WE
A
A
A
A
A
A
NC
NC
) are used to identify module
CC
A
A
A
14
16
16
17
18
19
10
11
12
13
20
21
22
23
3
0
0
1
2
3
7
8
9
4
5
6
7
1
3
ZIP/SIMM
Top View
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
December 2, 1997
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
CYM1946
1
3
5
7
9
fax id: 2045
408-943-2600
NC
PD
GND
PD
I/O
I/O
I/O
I/O
A
A
A
I/O
I/O
I/O
I/O
GND
A
CS
CS
A
OE
I/O
I/O
I/O
I/O
A
A
A
V
A
I/O
I/O
I/O
I/O
A
NC
0
1
2
15
17
3
4
5
CC
6
18
1946–2
2
1
8
9
10
11
12
13
14
15
24
25
26
27
28
29
30
31
2
4

Related parts for cym1946

cym1946 Summary of contents

Page 1

... 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) ...

Page 2

... Min. Duty Cycle = 100% Max 35, 45 > V 0.2V > V 0.2V < 0.2V IN Test Conditions ) MHz, 0– 5.0V CC 17– CYM1946 1946-45 1946- 1100 1100 585 585 Ambient Temperature + Min. Max. 2.4 0.4 2 0.3 CC –0.3 0.8 –32 +32 –20 +20 1100 ...

Page 3

... These parameters are guaranteed and not 100% tested. HZCS LZCS 3 CYM1946 ALL INPUT PULSES 90% 10% < 1946-45 1946-55 Min. Max. Min. Max ...

Page 4

... OHA ACS t DOE t LZOE 50 SCS PWE t SD DATA VALID t HZWE , and OE CYM1946 DATA VALID t HZOE t HZCS HIGH IMPEDANCE DATA VALID LZWE HIGH IMPEDANCE 1851–5 ICC ISB 1851–6 1851–7 ...

Page 5

... PM47 55 CYM1946PM-55C PM47 Document #: 38-M-00084 SCS PWE t SD DATA VALID t HZWE Mode Package Type 72-Pin Plastic SIMM Module 72-Pin Plastic SIMM Module 72-Pin Plastic SIMM Module 5 CYM1946 HIGH IMPEDANCE 1840–8 Operating Range Commercial Commercial Commercial ...

Page 6

... The inclusion of Cypress Semiconductor products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress Semiconductor against all charges. PRELIMINARY 72-Pin Plastic SIMM Module PM47 CYM1946 ...

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