CYM1851 CYPRESS [Cypress Semiconductor], CYM1851 Datasheet

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CYM1851

Manufacturer Part Number
CYM1851
Description
1,024K x 32 Static RAM Module
Manufacturer
CYPRESS [Cypress Semiconductor]
Datasheet
Features
Functional Description
The CYM1851 is a high-performance 32-megabit static RAM
module organized as 1,024K words by 32 bits. This module is
constructed from eight 1,024K x 4 SRAMs in SOJ packages
Cypress Semiconductor Corporation
Document #: 38-05274 Rev. **
• High-density 32-megabit SRAM module
• 32-bit Standard Footprint supports densities from 16K
• High-speed SRAMs
• Low active power
• 72 pins
• Available in ZIP, SIMM, or angled SIMM format
x 32 through 1M x 32
— Access time of 12 ns
— 8.36W (max.) at 12 ns
Logic Block Diagram
A
0
–A
CS
CS
CS
CS
WE
OE
19
1
2
3
4
20
1M x 4
1M x 4
1M x 4
1M x 4
SRAM
SRAM
SRAM
SRAM
4
4
4
4
I/O
I/O
I/O
I/O
0
8
16
24
– I/O
– I/O
– I/O
– I/O
3901 North First Street
3
11
19
27
PD
PD
PD
PD
1M x 4
1M x 4
1M x 4
1M x 4
SRAM
SRAM
SRAM
SRAM
1,024K x 32 Static RAM Module
0
1
2
3
mounted on an epoxy laminate substrate. Four chip selects are
used to independently enable the four bytes. Reading or writ-
ing can be executed on individual bytes or any combination of
multiple bytes through proper use of selects.
The CYM1851 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). The
CYM1851 is offered in vertical and angled SIMM configura-
tions and both are available with either tin-lead or 10 mi-
cro-inches of gold flash on the edge contacts.
Presence detect pins (PD
memory density in applications where modules with alternate
word depths can be interchanged.
- GND
- OPEN
- GND
- OPEN
4
4
4
4
I/O
I/O
I/O
I/O
San Jose
4
12
20
28
– I/O
– I/O
– I/O
– I/O
Pin Configuration
7
15
23
31
0
–PD
CA 95134
GND
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
GND
3
CS
CS
PD
PD
I/O
I/O
I/O
I/O
V
I/O
I/O
I/O
I/O
) are used to identify module
WE
A
A
A
A
A
A
A
NC
NC
CC
A
A
A
14
16
16
17
18
19
10
11
12
13
20
21
22
23
19
3
0
0
1
2
3
7
8
9
4
5
6
7
1
3
Revised March 15, 2002
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
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
CYM1851
1
3
5
7
9
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
2
1
8
9
10
11
12
13
14
15
24
25
26
27
28
29
30
31
2
4

Related parts for CYM1851

CYM1851 Summary of contents

Page 1

... Reading or writ- ing can be executed on individual bytes or any combination of multiple bytes through proper use of selects. The CYM1851 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

... CC CS > V – 0.2V, CC -12, -15 V > V – 0.2V < 0.2V IN Test Conditions ) MHz, 0– 5.0V CC power-up, otherwise I CC CYM1851 1851-25 1851- 1200 1200 960 480 480 480 Ambient Temperature + 10% Min. Max. Unit 2.4 0.4 2 ...

Page 3

... Min. Max. Min. Max CYM1851 90% 10% < Unit Page ...

Page 4

... DATA VALID CYM1851 Max. Unit Page ...

Page 5

... Address valid prior to or coincident with CS transition LOW. Document #: 38-05274 Rev ACS t DOE t LZOE 50% [ SCS PWE DATA VALID t HZWE t HZOE t HZCS IMPEDANCE DATA VALID LZWE HIGH IMPEDANCE CYM1851 HIGH ICC ISB Page ...

Page 6

... If CS goes HIGH simultaneously with WE HIGH, the output remains in a high-impedance state. Truth Table Inputs/Output High Data Out Data High Z Document #: 38-05274 Rev. ** [6,10 DATA VALID t HZWE Mode Deselect/Power-Down Read Write Deselect t SCS t HA PWE HIGH IMPEDANCE CYM1851 Page ...

Page 7

... CYM1851PZ-12C 15 CYM1851PM-15C CYM1851P8-15C CYM1851PN-15C CYM1851P6-15C CYM1851PZ-15C 20 CYM1851PM-20C CYM1851P8-20C CYM1851PN-20C CYM1851P6-20C CYM1851PZ-20C 25 CYM1851PM-25C CYM1851P8-25C CYM1851PN-25C CYM1851P6-25C CYM1851PZ-25C 35 CYM1851PM-35C CYM1851P8-35C CYM1851PN-35C CYM1851P6-35C CYM1851PZ-35C Package Diagrams Document #: 38-05274 Rev. ** Type Package Type PM04 72-Pin Plastic SIMM Module PM04 72-Pin Plastic SIMM Module (gold contacts) ...

Page 8

... 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. 72-Pin Plastic ZIP Module PZ09 CYM1851 Page ...

Page 9

... Document Title: CYM1851 1,024K x 32 Static RAM Module Document Number: 38-05274 Issue REV. ECN NO. Date ** 114175 3/19/02 Document #: 38-05274 Rev. ** Orig. of Change DSG Change from Spec number: 38-M-00052 to 38-05274 CYM1851 Description of Change Page ...

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