English
Language : 

CYM1846V33 Datasheet, PDF (1/8 Pages) Cypress Semiconductor – 512K x 32 3.3V Static RAM Module
46V33
PRELIMINARY
CYM1846V33
512K x 32 3.3V Static RAM Module
Features
• High-density 3.3V 16-megabit SRAM module
• 32-bit Standard Footprint supports densities from
16K x 32 through 2M x 32
• High-speed SRAMs
— Access time of 12 ns
• Low active power
— 1.650W (max.) at 12 ns
• 72 pins
• Available in ZIP, SIMM format
Functional Description
The CYM1846V33 is a high-performance 3.3V 16-megabit
static RAM module organized as 512K words by 32 bits. This
module is constructed from four 512K x 8 SRAMs in SOJ pack-
ages mounted on an epoxy laminate substrate. Four chip se-
lects are used to independently enable the four bytes. Reading
or writing can be executed on individual bytes or any combina-
tion of multiple bytes through proper use of selects.
The CYM1846V33 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 mother-
board design can be used to accommodate memory depth
ranging from 16K words (CYM1821) to 1,024K words
(CYM1851). The CYM1846V33 is offered in vertical SIMM
configuration and is available with either tin-lead or 10
micro-inches of gold flash on the edge contacts.
Presence detect pins (PD0−PD3) are used to identify module
memory density in applications where modules with alternate
word depths can be interchanged.
Logic Block Diagram
A0–A18 19
OE
WE
CS1
CS2
CS3
CS4
PD0 - OPEN
PD1 - OPEN
PD2 - GND
PD3 - OPEN
512K x 8
SRAM
I/O0–I/O7
8
512K x 8
SRAM
I/O7–I/O15
8
512K x 8
SRAM
I/O16–I/O23
8
512K x 8
SRAM
I/O24–I/O31
8
Pin Configuration
ZIP/SIMM
Top View
NC
PD3
PD0
I/O0
I/O1
I/O2
I/O3
VCC
AA78
A9
I/O4
I/O5
I/O6
I/O7
WE
A14
CS1
CS3
A16
GND
I/O16
I/O17
I/O18
I/O19
A10
A11
A12
A13
I/O20
I/O21
I/O22
I/O23
GND
NC
NC
1
2
3
4
5
6
7
8
9
10 11
12 13
14 15
16 17
18 19
20 21
22 23
24 25
26 27
28 29
30 31
32
33
34 35
36
37
38 39
40 41
42 43
44 45
46 47
48 49
50 51
52 53
54 55
56 57
58 59
60 61
62 63
64 65
66 67
68 69
70 71
72
NC
PD2
GND
PD1
I/O8
I/O9
I/O10
I/O11
A0
A1
A2
I/O12
I/O13
I/O14
I/O15
GND
A15
CS2
CS 4
A17
OE
I/O24
I/O25
I/O26
I/O27
A3
A4
A5
VCC
A6
I/O28
I/O29
I/O30
I/O31
A18
NC
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
Document #: 38-05275 Rev. **
Revised March 15, 2002
 ▷