HANBit
HMS1M32M8S
H A N
High-Speed SRAM MODULE 4Mbyte(1M x 32-Bit)
B I T
HMS1M32M8S, HMS1M32Z8S
Part No.
GENERAL DESCRIPTION
The HMS1M32M8S is a high-speed static random access memory (SRAM) module containing 1,048,576 words
organized in a x32-bit configuration. The module consists of eight 512K x 8 SRAMs mounted on a 72-pin, double-
sided, FR4-printed circuit board.
The HMS1M32M8S also support low data retention voltage for battery back-up operations with low data retention
current. Eight chip enable inputs, (/CE_UU1, /CE_UM1, /CE_LM1, /CE_LL1, /CE_UU2, /CE_UM2, /CE_LM2,
/CE_LL2) are used to enable the module’s 4 bytes independently. Output enable (/OE) and write enable(/WE) can
set the memory input and output.
Data is written into the SRAM memory when write enable (/WE) and chip enable (/CE) inputs are both LOW.
Reading is accomplished when /WE remains HIGH and /CE and output enable (/OE) are LOW.
For reliability, this SRAM module is designed as multiple power and ground pin. All module components may be
powered from a single +5V DC power supply and all inputs and outputs are fully TTL-compatible
PIN ASSIGNMENT
FEATURES
Part identification
A18
A16
Vss
A6
Vcc
A5
A4
Vcc
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
Vss
A3
A2
A1
A0
Vcc
A11
/ OE
A10
1
2
3
4
5
6
7
8
9
- HMS1M32M8S : SIMM design
- HMS1M32Z8S : ZIP design
Pin-Compatible with the HMS1M32M8S
Access times : 10, 12, 15, 17 and 20ns
High-density 4MByte design
High-reliability, high-speed design
Single + 5V ±0.5V power supply
All inputs and outputs are TTL-compatible
FR4-PCB design
/ CE_UM2
/ CE_UM1
DQ23
DQ16
DQ17
DQ18
DQ22
DQ21
DQ20
DQ19
Vcc
Vcc 10
/ CE_LL2 11
/ CE_LL1 12
DQ7 13
DQ0 14
DQ1 15
DQ2 16
DQ6 17
DQ5 18
DQ4 19
DQ3 20
A15 21
A17 22
/ WE 23
A13 24
Vcc 25
DQ8 26
DQ9 27
A14
A12
A7
Vcc
A8
A9
72-Pin SIMM Design
OPTIONS
Timing
MARKING
DQ24
DQ25
DQ26
/ CE_UU2
/ CE_UU1
DQ31
DQ30
DQ29
DQ28
DQ27
Vss
10ns access
12ns access
15ns access
17ns access
20ns access
Packages
-10
-12
-15
-17
-20
DQ10 28
/ CE_LM2 29
Vcc 30
/ CE_LM1 31
DQ15 32
DQ14 33
DQ13 34
DQ12 35
DQ11 36
SIMM
TOP VIEW
72-pin SIMM
M
1
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