cym1861 Cypress Semiconductor Corporation., cym1861 Datasheet

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cym1861

Manufacturer Part Number
cym1861
Description
2,048k Static Module
Manufacturer
Cypress Semiconductor Corporation.
Datasheet
Features
Functional Description
The CYM1861 is a high-performance 64-megabit static RAM
module organized as 2,048K words by 32 bits. This module is
constructed from sixteen 1,024K x 4 SRAMs in SOJ packages
mounted on an epoxy laminate substrate. Four chip selects are
Selection Guide
Cypress Semiconductor Corporation
Maximum Access Time (ns)
Maximum Operating Current (mA)
Maximum Standby Current (mA)
Shaded area contains advance information.
• High-density 64-megabit SRAM module
• 32-bit Standard Footprint supports densities from 16K
• High-speed SRAMs
• 72 pins
• Available in SIMM format
x 32 through 2M x 32
CS
WE
A
OE
— Access time of 35 ns
Logic Block Diagram
A
0
– A
1
20
–CS
19
4
PAL
Buffer
20
1M x 4
1M x 4
SRAM
1M x 4
SRAM
SRAM
1M x 4
SRAM
4
4
4
4
4
4
4
4
3901 North First Street
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
PRELIMINARY
8
16
0
12
20
4
24
28
–I/O
–I/O
–I/O
I/O
I/O
I/O
I/O
I/O
11
3
7
19
15
27
23
31
2,048K x 32 Static RAM Module
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 CYM1861 is designed for use with standard 72-pin SIMM
sockets. The pinout is downward compatible with the 64-pin
JEDEC
CYM1836, and CYM1841). Thus, a single motherboard de-
sign can be used to accommodate memory depth ranging from
16K words (CYM1821) to 2,048K words (CYM1861). The
CYM1861 is offered in vertical SIMM configuration and is avail-
able with tin-lead edge contacts.
Presence detect pins (PD
memory density in applications where modules with alternate
word depths can be interchanged.
PD
PD
PD
PD
1M x 4
1M x 4
SRAM
1M x 4
SRAM
SRAM
1M x 4
SRAM
0
1
2
3
- OPEN
- GND
- GND
- OPEN
1861–1
SIMM
San Jose
4
4
4
4
4
4
4
4
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
module
1861-25
8
16
0
12
4
20
24
28
–I/O
–I/O
–I/O
1200
480
25
I/O
I/O
I/O
I/O
I/O
3
7
11
0
19
15
27
23
–PD
31
Pin Configuration
family
CA 95134
3
) are used to identify module
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
GND
GND
CS
CS
PD
PD
I/O
I/O
I/O
I/O
V
I/O
I/O
I/O
I/O
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
(CYM1821,
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
CYM1861
1861-35
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
1
3
5
7
9
960
480
408-943-2600
35
May 4, 1998
CYM1831,
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
A
CC
0
1
2
15
17
3
4
5
6
18
20
1861–2
2
1
8
9
10
11
12
13
14
15
24
25
26
27
28
29
30
31
2
4

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cym1861 Summary of contents

Page 1

... Static RAM Module 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 CYM1861 is designed for use with standard 72-pin SIMM sockets. The pinout is downward compatible with the 64-pin JEDEC SIMM CYM1836, and CYM1841) ...

Page 2

... < 0.2V IN Test Conditions MHz 5. 481 5V 3.0V R2 GND 255 5 pF INCLUDING JIG AND 1861–3 SCOPE (b) 1.73V 2 CYM1861 Ambient Temperature + Min. Max. 2.4 0.4 2 0.3 CC –0.5 0.8 –2 +2 –20 +20 2582 960 160 Max. Unit 10 20 power-up, otherwise I will exceed values given ...

Page 3

... PRELIMINARY 3 CYM1861 ...

Page 4

... OHA is less than t for any given device. These parameters are guaranteed and not 100% tested. HZCS LZCS . IL 4 CYM1861 1861-25 1861-35 Max. Min. Max ...

Page 5

... Note: 9. Address valid prior to or coincident with CS transition LOW. PRELIMINARY DOE LZOE DATA VALID 50 SCS PWE t SD DATA VALID t HZWE 5 CYM1861 t HZOE t HZCS HIGH IMPEDANCE t PD 50% 1861– LZWE HIGH IMPEDANCE 1861–7 ICC ISB ...

Page 6

... 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 SCS PWE t SD DATA VALID t HZWE Mode Package Type 72-Pin Plastic SIMM Module 72-Pin Plastic SIMM Module CYM1861 HIGH IMPEDANCE 1861–8 Operating Range Commercial Commercial ...

Page 7

... Package Diagram PRELIMINARY 72-Pin SIMM Module PM48 7 CYM1861 ...

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