HY638256 Series
32Kx8bit CMOS FAST SRAM
DESCRIPTION
The HY638256 is a high-speed 32,768 x 8-bits CMOS static RAM fabricated using Hyundai's high
performance twin tub CMOS process technology. This high reliability process coupled with high-speed
circuit design techniques, yields maximum access time of 15ns. The HY638256 has a data retention mode
that guarantees data to remain valid at a minimum power supply voltage of 2.0 volt. It is suitable for use in
high-density high-speed system applications.
FEATURES
鈥?/div>
Single 5V鹵10% Power Supply
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High speed - 15/20/25ns(max.)
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Low power consumption(Max.)
Mode
Conditions Current Units
Operating 15ns
100
mA
20/25ns
90
mA
Standby
TTL
30
mA
CMOS
2
mA
L
100
uA
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Battery backup(L-part)
- 2.0V(min) data retention
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Fully static operation and Tri-state outputs
- No clock or refresh required
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TTL compatible inputs and outputs
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Standard pin configuration
- 28pin 300mil SOJ
- 28pin 8 x 13.4 mm TSOP-I
BLOCK DIAGRMM
A0
ADD INPUT BUFFER
COLUMN DECODER
SENSE AMP
ROW DECODER
I/O1
OUTPUT BUFFER
I/O8
A14
CONTROL
LOGIC
/CS
/OE
/WE
PIN CONNECTION
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
I/O1
I/O2
I/O3
Vss
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
Vcc
/WE
/OE
A13
A11
A8
A9
A9
A8
A11
A13
/OE
/WE
A10
Vcc
/CS1
A14
I/O8
A12
A7
I/O7
A6
I/O6
A5
I/O5
A4
I/O4
A3
PIN DESCRIPTION
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
A10
/CS
I/O8
I/O7
I/O6
I/O5
I/O4
Vss
I/O3
I/O2
I/O1
A0
A1
A2
SOJ
TSOP-I(Standard)
Pin Name
/CS
/WE
/OE
A0~A14
I/O1~I/O8
Vcc
Vss
Pin Function
Chip Select
Write Enable
Output Enable
Adderss Input
Data Input/Output
Power(+5.0V)
Ground
ORDERING INFORMATION
Part No.
HY638256J
HY638256LJ
HY638256T1
HY638256LT1
Speed
15/20/25
15/20/25
15/20/25
15/20/25
Power
L-part
L-part
Package
SOJ
SOJ
TSOP-I Standard
TSOP-I Standard
This document is a general product description and is subject to change without notice. Hyundai Electronics does not assume any
responsibility for use of circuits described. No patent licenses are implied.
Rev.01 / Jul.96
Hyundai Semiconductor
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