HANBit
HMS1M32M8LA
SRAM MODULE 4Mbyte(1Mx32Bit) ,LOW POWER,72Pin SIMM,5V
Part No.
HMS1M32M8LA
GENERAL DESCRIPTION
The HMS1M32M8LA is a static random access memory (SRAM) module containing 1,048,576 bits 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 HMS1M32M8LA also support low data retention voltage for battery back-up operations with low data retention current.
Eight chip enable inputs, (/CE0, /CE1, /CE2, /CE3, /CE4, /CE5, /CE6, /CE7) are used to enable the module’s 4M 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.
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.
Reading is
FEATURES
w
Part identification
- HMS1M32M8LA : SIMM design
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Access times : 55ns, 70ns
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High-density 4MByte design
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High-reliability, low-power design
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Single + 5V
±0.5V
power supply
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Low data retention voltage : 2V(min)
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Three state output and TTL-compatible
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FR4-PCB design
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Low profile 72-Pin SIMM
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
PIN ASSIGNMENT
SYMBOL
Vcc
Vcc
Vss
Vss
Vss
Vss
Vss
DQ0
DQ8
DQ1
DQ9
DQ2
DQ10
DQ3
DQ11
Vcc
A0
A7
A1
A8
A2
A9
DQ12
DQ4
PIN
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
SYMBOL
DQ13
DQ5
DQ14
DQ6
DQ15
DQ7
/OE
/CE3
A15
A14
/CE6
/CE7
/CE4
/CE5
A17
A16
/CE2
Vss
DQ24
DQ16
DQ25
DQ17
DQ26
DQ18
PIN
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
SYMBOL
DQ27
DQ19
A3
A10
A4
A11
A5
A12
Vcc
A13
A6
DQ20
DQ28
DQ21
DQ29
DQ22
DQ30
DQ23
DQ31
Vss
A18
/WE
/CE1
/CE0
OPTIONS
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Timing
55ns access
70ns access
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Packages
72-pin SIMM
72-pin ZIP
MARKING
-55
-70
M
Z
SIMM
TOP VIEW
URL: www.hbe.co.kr
Rev. 1.0 (September / 2002)
1
HANBit Electronics Co.,Ltd.
HANBIT [ HANBIT ELECTRONICS CO.,LTD ]
