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x 16-bit. HM62V16256B Datasheet |
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HM62V16256B Series
4 M SRAM (256-kword × 16-bit)
ADE-203-933C (Z)
Rev. 2.0
Oct. 14, 1999
Description
The Hitachi HM62V16256B Series is 4-Mbit static RAM organized 262,144-word × 16-bit. HM62V16256B
Series has realized higher density, higher performance and low power consumption by employing Hi-CMOS
process technology. It offers low power standby power dissipation; therefore, it is suitable for battery backup
systems. It is packaged in standard 44-pin plastic TSOPII.
Features
• Single 3.0 V supply: 2.7 V to 3.6 V
• Fast access time: 70 ns/85 ns (max)
• Power dissipation:
Active: 9 mW (typ)
Standby: 3 µW (typ)
• Completely static memory.
No clock or timing strobe required
• Equal access and cycle times
• Common data input and output.
Three state output
• Battery backup operation.
2 chip selection for battery backup
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HM62V16256B Series
Ordering Information
Type No.
HM62V16256BLTT-7
HM62V16256BLTT-8
HM62V16256BLTT-7SL
HM62V16256BLTT-8SL
Access time
70 ns
85 ns
70 ns
85 ns
Package
400-mil 44-pin plastic TSOPII (normal-bend type) (TTP-44DB)
2
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Pin Arrangement
HM62V16256B Series
A4
A3
A2
A1
A0
CS1
I/O0
I/O1
I/O2
I/O3
VCC
VSS
I/O4
I/O5
I/O6
I/O7
WE
A17
A16
A15
A14
A13
44-pin TSOP
1 44
2 43
3 42
4 41
5 40
6 39
7 38
8 37
9 36
10 35
11 34
12 33
13 32
14 31
15 30
16 29
17 28
18 27
19 26
20 25
21 24
22 23
(Top view)
A5
A6
A7
OE
UB
LB
I/O15
I/O14
I/O13
I/O12
VSS
VCC
I/O11
I/O10
I/O9
I/O8
CS2
A8
A9
A10
A11
A12
Pin Description
Pin name
A0 to A17
I/O0 to I/O15
CS1
CS2
WE
OE
LB
UB
VCC
VSS
Function
Address input
Data input/output
Chip select 1
Chip select 2
Write enable
Output enable
Lower byte select
Upper byte select
Power supply
Ground
3
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