HANBit
HMS25632M8B/Z8B
H A N
SRAM MODULE 1Mbyte (256K x 32-Bit) , 72-Pin
B I T
HMS25632M8B, HMS25632Z8B
Part No.
GENERAL DESCRIPTION
The HMS25632M8B is a high-speed static random access memory (SRAM) module containing 262,144 words
organized in a x32-bit configuration. The module consists of eight 256K x 4 SRAMs mounted on a 72-pin, double-
sided, FR4-printed circuit board.
PD0 to PD3 identify the module’s density allowing interchangeable use of alternate density, industry- standard
modules. Eight chip enable inputs, (/CE1, /CE2, /CE3 and /CE4) 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
Access times : 8, 10,12, 15 and 20ns
NC
NC
PD2
PD3
Vss
PD0
PD1
DQ0
DQ8
DQ1
DQ9
DQ2
DQ10
DQ3
DQ11
Vcc
1
2
3
4
5
6
7
8
/ CE4 37
/ CE3 38
A17 39
A16 40
/ OE 41
Vss 42
DQ24 43
DQ16 44
DQ25 45
DQ17 46
DQ26 47
DQ18 48
DQ27 49
DQ19 50
A3 51
A10 52
A4 53
A11 54
A5 55
A12 56
Vcc 57
A13 58
A6 59
DQ20 60
DQ28 61
DQ21 62
DQ29 63
DQ22 64
DQ30 65
DQ23 66
DQ31 67
Vss 68
NC 69
NC 70
NC 71
NC 72
High-density 1MByte design
High-reliability high-speed design
Single + 5V ±0.5V power supply
Easy memory expansion /CE and /OE functions
All inputs and outputs are TTL-compatible
Industry-standard pinout
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
FR4-PCB design
Part identification
A0
A7
A1
A8
A2
A9
- HMS25632M8B : 72-pin SIMM design
- HMS25632Z8B : 72-pin ZIP design
→ Pin-compatible with the HMS25632M8B
DQ12
DQ4
DQ13
DQ5
DQ14
DQ6
DQ15
DQ7
Vss
/ WE
A15
A14
/ CE2
/ CE1
OPTIONS
Timing
MARKING
10ns access
12ns access
15ns access
20ns access
Packages
-10
-12
-15
-20
PD0 = Vss
PD1 = Vss
PD2 = Open
PD3 = Open
72-pin SIMM
72-pin ZIP
M
Z
7 2 -Pin
TOP VIEW
SIMM
1
HANBit Electronics Co.,Ltd.