cym1846p8-35c Cypress Semiconductor Corporation., cym1846p8-35c Datasheet

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cym1846p8-35c

Manufacturer Part Number
cym1846p8-35c
Description
512k X 32 Static Ram Module
Manufacturer
Cypress Semiconductor Corporation.
Datasheet
Features
Functional Description
The CYM1846 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 from 16Kx32 through
• High-speed SRAMs
• Low active power
• Compatible with CYM1821, CYM1831, CYM1836,
• Available in 72-pin ZIP or SIMM/Angled SIMM
1Mx32
CYM1841, and CYM1851 JEDEC modules
— Access time of 12 ns
— 4.4W (max.) at 12 ns
Logic Block Diagram
A
0
– A
CS
CS
CS
CS
WE
OE
18
2
3
4
1
19
3901 North First Street
512Kx8
512Kx8
512Kx8
512Kx8
SRAM
SRAM
SRAM
SRAM
8
8
8
8
PD
PD
PD
PD
I/O
I/O
I/O
I/O
0
1
2
3
0
8
16
24
constructed from four 512K 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 the chip selects.
The CYM1846 is designed for use with standard 72-pin SIMM
socket and ZIP footprint. The pinout is compatible with the
64-pin
CYM1831, CYM1836, and CYM1841) and the 72-pin
CYM1851. Thus, a single motherboard design can be used to
accommodate memory depth ranging from 16K words
(CYM1821) to 1024K words (CYM1851). The standard SIMM
can be used in Angled SIMM sockets and is available with
either tin-lead or 10 micro-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.
– OPEN
– OPEN
– GND
– OPEN
– I/O
– I/O
– I/O
– I/O
512K x 32 Static RAM Module
7
15
23
31
JEDEC
San Jose
Pin Configuration
December 1994 - Revised October 10, 1997
ZIP/SIMM
0
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
– PD
WE
A
A
A
A
A
A
NC
NC
NC
CC
A
A
A
14
16
16
17
18
19
10
11
12
13
20
21
22
23
CA 95134
3
0
0
1
2
3
7
8
9
4
5
6
7
1
3
module
3
ZIP/SIMM
) are used to identify module
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
1
3
5
7
9
family
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
CYM1846
CC
0
1
2
15
17
3
4
5
6
18
fax id: 2018
2
1
8
9
10
11
12
13
14
15
24
25
26
27
28
29
30
31
2
4
408-943-2600
(CYM1821,
1846–1

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cym1846p8-35c Summary of contents

Page 1

... Compatible with CYM1821, CYM1831, CYM1836, CYM1841, and CYM1851 JEDEC modules • Available in 72-pin ZIP or SIMM/Angled SIMM Functional Description The CYM1846 is a high-performance 16-megabit static RAM module organized as 512K words by 32 bits. This module is Logic Block Diagram A – ...

Page 2

Selection Guide Maximum Access Time (ns) Maximum Operating Current (mA) Maximum Standby Current (mA) Shaded area contains preliminary information. Maximum Ratings (Above which the useful life may be impaired. For user guide- lines, not tested.) Storage Temperature ................................. –55 C ...

Page 3

AC Test Loads and Waveforms R1 481 5V OUTPUT OUTPUT R2 255 30 pF INCLUDING JIG AND SCOPE (a) Equivalent to: THÉVENIN EQUIVALENT 167 1.73V OUTPUT Switching Characteristics Over the Operating Range Parameter READ CYCLE t Read Cycle Time RC ...

Page 4

Switching Characteristics Over the Operating Range Parameter Description READ CYCLE t Read Cycle Time RC t Address to Data Valid AA t Data Hold from Address Change OHA t CS LOW to Data Valid ACS t OE LOW to Data ...

Page 5

Switching Waveforms [7, 8] Read Cycle No. 1 ADDRESS DATA OUT PREVIOUS DATA VALID [7, 9] Read Cycle No ACS OE HIGH IMPEDANCE DATA OUT t LZCS SUPPLY CURRENT [6] Write Cycle No. ...

Page 6

... CYM1846PZ–12C 15 CYM1846PM–15C CYM1846P8–15C CYM1846PZ–15C 20 CYM1846PM–20C CYM1846P8–20C CYM1846PZ–20C 25 CYM1846PM–25C CYM1846P8–25C CYM1846PZ–25C 35 CYM1846PM–35C CYM1846P8–35C CYM1846PZ–35C Shaded area contains preliminary information. Document #: 38–M–00073– SCS PWE t SD DATA VALID ...

Page 7

... 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 SIMM Module PM21 72-Pin Plastic ZIP Module PZ11 CYM1846 ...

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