HM62256B Series
32,768-word
×
8-bit High Speed CMOS Static RAM
The Hitachi HM62256B is a CMOS static RAM
organized 32-kword
×
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 back-
up systems.
Ordering Information
Type No.
HM62256BLP-7
HM62256BLP-8
HM62256BLP-10
HM62256BLP-12
HM62256BLP-7SL
HM62256BLP-8SL
HM62256BLP-10SL
HM62256BLP-12SL
HM62256BLSP-7
HM62256BLSP-8
HM62256BLSP-10
HM62256BLSP-12
HM62256BLSP-7SL
HM62256BLSP-8SL
HM62256BLSP-10SL
HM62256BLSP-12SL
HM62256BLFP-7T
HM62256BLFP-8T
HM62256BLFP-10T
HM62256BLFP-12T
HM62256BLFP-7SLT
HM62256BLFP-8SLT
HM62256BLFP-10SLT
HM62256BLFP-12SLT
HM62256BLT-8
HM62256BLT-10
HM62256BLT-12
HM62256BLT-7SL
HM62256BLT-8SL
HM62256BLTM-8
HM62256BLTM-7SL
HM62256BLTM-8SL
Access time Package
70 ns
85 ns
100 ns
120 ns
70 ns
85 ns
100 ns
120 ns
70 ns
85 ns
100 ns
120 ns
70 ns
85 ns
100 ns
120 ns
70 ns
85 ns
100 ns
120 ns
70 ns
85 ns
100 ns
120 ns
85 ns
100 ns
120 ns
70 ns
85 ns
85 ns
70 ns
85 ns
8 mm
×
13.4 mm
28-pin TSOP
(TFP-28DA)
8 mm
×
14 mm
32-pin TSOP
(TFP-32DA)
450-mil
28-pin
plastic SOP
(FP-28DA)
300-mil
28-pin
plastic DIP
(DP-28NA)
600-mil
28-pin
plastic DIP
(DP-28)
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Features
• High speed
Fast access time: 70/85/100/120 ns (max)
• Low power
Standby: 1.5 µW (typ)
Operation: 25 mW (typ) (f = 1 MHz)
• Single 5 V supply
• 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
• Capability of battery back up operation
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1
HM62256B Series
Pin Arrangement
HM62256BLP/BLFP/BLSP Series
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
I/O0
I/O1
I/O2
V
SS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
CC
WE
A13
A8
A9
A11
OE
A10
CS
I/O7
I/O6
I/O5
I/O4
I/O3
HM62256B Series
(Top View)
HM62256BLT Series
OE
A11
NC
A9
A8
A13
WE
V
CC
A14
A12
A7
A6
A5
NC
A4
A3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
A10
CS
NC
I/O7
I/O6
I/O5
I/O4
I/O3
V
SS
I/O2
I/O1
I/O0
A0
NC
A1
A2
(Top View)
HM62256BLTM Series
OE
A11
A9
A8
A13
WE
V
CC
A14
A12
A7
A6
A5
A4
A3
22
23
24
25
26
27
28
1
2
3
4
5
6
7
21
20
19
18
17
16
15
14
13
12
11
10
9
8
A10
CS
I/O7
I/O6
I/O5
I/O4
I/O3
V
SS
I/O2
I/O1
I/O0
A0
A1
A2
(Top View)
2
HM62256B Series
Pin Description
Symbol
A0 – A14
I/O0 – I/O7
CS
WE
Function
Address
Input/output
Chip select
Write enable
Symbol
OE
NC
V
CC
V
SS
HM62256B Series
Function
Output enable
No connection
Power supply
Ground
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Block Diagram
A12
A5
A7
A6
A8
A13
A14
A4
A3
•
•
•
•
•
•
•
•
V
CC
V
SS
Row
Decoder
•
•
Memory Matrix
512
×
512
I/O0
•
•
•
•
•
•
•
•
•
•
•
•
Column I/O
Column Decoder
•
•
Input
Data
Control
•
•
•
•
•
I/O7
A2 A1 A0 A10 A9 A11
•
•
CS
WE
OE
Timing Pulse Generator
Read/Write Control
3
HM62256B Series
Function Table
WE
X
H
H
L
L
Note:
CS
H
L
L
L
L
OE
X
H
L
H
L
X: H or L
Mode
Not selected
Output disable
Read
Write
Write
V
CC
current
I
SB
, I
SB1
I
CC
I
CC
I
CC
I
CC
I/O pin
High-Z
High-Z
Dout
Din
Din
HM62256B Series
Ref. cycle
—
—
Read cycle (1)–(3)
Write cycle (1)
Write cycle (2)
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Absolute Maximum Ratings
Parameter
Power supply voltage*1
Terminal voltage*1
Power dissipation
Operating temperature
Storage temperature
Storage temperature under bias
Symbol
V
CC
V
T
P
T
Topr
Tstg
Tbias
Value
–0.5 to +7.0
–0.5*2 to V
CC
+ 0.3*3
1.0
0 to + 70
–55 to +125
–10 to +85
Unit
V
V
W
°C
°C
°C
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Note: 1. Relative to V
SS
2. V
T
min: –3.0 V for pulse half-width
≤
50 ns
3. Maximum voltage is 7.0 V
Recommended DC Operating Conditions
(Ta = 0 to +70°C)
Parameter
Supply voltage
Symbol
V
CC
V
SS
Input high (logic 1) voltage
Input low (logic 0) voltage
V
IH
V
IL
Min
4.5
0
2.2
–0.5
*1
Typ
5.0
0
—
—
Max
5.5
0
V
CC
+0.3
0.8
Unit
V
V
V
V
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Note: 1. V
IL
min: –3.0 V for pulse half-width
≤
50 ns
4
HM62256B Series
Parameter
Input leakage current
Output leakage current
Symbol Min
|I
LI
|
|I
LO
|
I
CC
I
CC1
—
—
Typ
*1
—
—
Max
1
1
Unit
µA
µA
HM62256B Series
Test conditions
Vin = V
SS
to V
CC
CS
= V
IH
or
OE
= V
IH
or
WE
= V
IL,
V
I/O
= V
SS
to V
CC
CS
= V
IL,
others = V
IH/
V
IL
Iout = 0 mA
min cycle, duty = 100 %, I
I/O =
0 mA
CS
= V
IL,
others = V
IH/
V
IL
DC Characteristics
(Ta = 0 to +70°C, V
CC
= 5 V ±10%, V
SS
= 0 V)
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Operating power supply
current
Average
operating
power
supply
current
HM62256B-7
—
6
15
mA
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—
—
—
—
I
CC2
Standby V
CC
current
I
SB
I
SB1
—
33
29
26
24
5
60
50
50
45
15
mA
Cycle time = 1 µs, I
I/O
= 0 mA
CS
= V
IL,
V
IH
= V
CC
, V
IL
= 0
CS
= V
IH
Vin
≥
0 V,
CS
> V
CC
– 0.2 V,
I
OL
= 2.1 mA
I
OH
= –1.0 mA
mA
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HM62256B-8
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HM62256B-10
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HM62256B-12
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—
—
—
Output low voltage
Output high voltage
V
OL
V
OH
—
2.4
0.3
0.3
0.3
*2
—
—
2
100
50
*2
0.4
—
V
V
mA
µA
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Notes: 1. Typical values are at V
CC
= 5.0 V, Ta = +25°C and not guaranteed.
2. This characteristics is guaranteed only for L-SL version.
Capacitance
(Ta = 25°C, f = 1.0 MHz)
*1
Parameter
Input capacitance
Input/output capacitance
Symbol
Cin
C
I/O
Min
—
—
Typ
—
—
Max
8
10
Unit
pF
pF
Test conditions
Vin = 0 V
V
I/O
= 0 V
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Note: 1. This parameter is sampled and not 100% tested.
5
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