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x 8-bit. HM62256B Datasheet |
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HM62256B Series
256k SRAM (32-kword × 8-bit)
ADE-203-135F (Z)
Rev. 6.0
Nov. 13, 1997
Description
The Hitachi HM62256B Series is a CMOS static RAM organized 32,768-word × 8-bit. It realizes higher
performance and low power consumption by employing 0.8 µm Hi-CMOS process technology. The
device, packaged in 8 × 14 mm TSOP, 8 × 13.4 mm TSOP with thickness of 1.2 mm, 450 mil SOP (foot
print pitch width), 600 mil plastic DIP, or 300 mil plastic DIP, is available for high density mounting. It
offers low power standby power dissipation; therefore, it is suitable for battery backup systems.
Features
• Single 5.0 V supply: 5.0 V ± 10%
• Access time: 55 ns/70 ns/85 ns (max)
• Power dissipation:
Active: 25 mW (typ) (f = 1 MHz)
Standby: 1.0 µW (typ)
• Completely static memory
No clock or timing strobe required
• Equal access and cycle times
• Common data input and output
Three state output
• Directly TTL compatible all inputs and outputs
• Battery backup operation
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HM62256B Series
Ordering Information
Type No.
HM62256BLP-7
HM62256BLP-7SL
HM62256BLSP-7
HM62256BLSP-7SL
HM62256BLFP-7T
HM62256BLFP-5SLT
HM62256BLFP-7SLT
HM62256BLFP-7ULT
HM62256BLT-8
HM62256BLT-7SL
HM62256BLTM-8
HM62256BLTM-5SL
HM62256BLTM-7SL
HM62256BLTM-7UL
Access time
70 ns
70 ns
70 ns
70 ns
70 ns
55 ns
70 ns
70 ns
85 ns
70 ns
85 ns
55 ns
70 ns
70 ns
Package
600-mil 28-pin plastic DIP (DP-28)
300-mil 28-pin plastic DIP (DP-28NA)
450-mil 28-pin plastic SOP (FP-28DA)
8 mm × 14 mm 32-pin TSOP (TFP-32DA)
8 mm × 13.4 mm 28-pin TSOP (TFP-28DA)
Pin Arrangement
HM62256BLP/BLFP/BLSP Series
A14 1
A12 2
A7 3
A6 4
A5 5
A4 6
A3 7
A2 8
A1 9
A0 10
I/O0 11
I/O1 12
I/O2 13
VSS 14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
(Top view)
VCC
WE
A13
A8
A9
A11
OE
A10
CS
I/O7
I/O6
I/O5
I/O4
I/O3
2
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Pin Arrangement (cont.)
HM62256B Series
OE 1
A11 2
NC 3
A9 4
A8 5
A13 6
WE 7
VCC
8
A14 9
A12 10
A7 11
A6 12
A5 13
NC 14
A4 15
A3 16
OE 22
A11 23
A9 24
A8 25
A13 26
WE 27
VCC 28
A14 1
A12 2
A7 3
A6 4
A5 5
A4 6
A3 7
HM62256BLT Series
(Top view)
HM62256BLTM Series
(Top view)
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
21
20
19
18
17
16
15
14
13
12
11
10
9
8
A10
CS
NC
I/O7
I/O6
I/O5
I/O4
I/O3
VSS
I/O2
I/O1
I/O0
A0
NC
A1
A2
A10
CS
I/O7
I/O6
I/O5
I/O4
I/O3
VSS
I/O2
I/O1
I/O0
A0
A1
A2
Pin Description
Pin Name
A0 to A14
I/O0 to I/O7
CS
WE
OE
VCC
VSS
NC
Function
Address input
Data input/output
Chip select
Write enable
Output enable
Power supply
Ground
No connection
3
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