GS72108ATP
TSOP
Commercial Temp
Industrial Temp
Features
• Fast access time: 7, 8, 10, 12 ns
• CMOS low power operation: 135/115/95/80 mA at minimum
cycle time
• Single 3.3 V power supply
• All inputs and outputs are TTL-compatible
• Fully static operation
• Industrial Temperature Option: –40° to 85°C
• Package line up
TP: 400 mil, 44-pin TSOP Type II package
GP:RoHS-compliant 400 mil, 44-pin TSOP Type II
package
256K x 8
2Mb Asynchronous SRAM
7, 8, 10, 12 ns
3.3 V V
DD
Center V
DD
and V
SS
TSOP-II 256K x 8-Pin Configuration
NC
NC
A
4
A
3
A
2
A
1
A
0
CE
DQ
1
DQ
2
V
DD
V
SS
DQ
3
DQ
4
WE
A
17
A
16
A
15
A
14
A
13
NC
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
NC
NC
NC
A
5
A
6
A
7
A
8
OE
DQ
8
DQ
7
V
SS
V
DD
DQ
6
DQ
5
A
9
A
10
A
11
A
12
NC
NC
NC
NC
44-pin
400 mil TSOP II
Description
The GS72108A is a high speed CMOS Static RAM organized
as 262,144 words by 8 bits. Static design eliminates the need
for external clocks or timing strobes. The GS operates on a
single 3.3 V power supply and all inputs and outputs are TTL-
compatible. The GS72108A is available in 400 mil TSOP
Type-II packages.
Pin Descriptions
Symbol
A
0
–A
17
DQ
1
–DQ
8
CE
WE
OE
V
DD
V
SS
NC
Description
Address input
Data input/output
Chip enable input
Write enable input
Output enable input
+3.3 V power supply
Ground
No connect
Rev: 1.07a 4/2009
1/11
© 2001, GSI Technology
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
GS72108ATP
Block Diagram
A
0
Address
Input
Buffer
Row
Decoder
Memory Array
A
17
CE
WE
OE
Column
Decoder
Control
I/O Buffer
DQ
1
DQ
8
Truth Table
CE
H
L
L
L
Note:
X: “H” or “L”
OE
X
L
X
H
WE
X
H
L
H
DQ
1
to DQ
8
Not Selected
Read
Write
High Z
V
DD
Current
ISB
1
, ISB
2
I
DD
Rev: 1.07a 4/2009
2/11
© 2001, GSI Technology
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
GS72108ATP
Absolute Maximum Ratings
Parameter
Supply Voltage
Input Voltage
Output Voltage
Allowable power dissipation
Storage temperature
Symbol
V
DD
V
IN
V
OUT
PD
T
STG
Rating
–0.5
to +4.6
–0.5
to V
DD
+0.5
(4.6 V max.)
–0.5
to V
DD
+0.5
(4.6 V max.)
0.7
–55
to 150
Unit
V
V
V
W
o
C
Note:
Permanent device damage may occur if Absolute Maximum Ratings are exceeded. Functional operation shall be restricted to Recommended
Operating Conditions. Exposure to higher than recommended voltages for extended periods of time could affect device reliability.
Rev: 1.07a 4/2009
3/11
© 2001, GSI Technology
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
GS72108ATP
Recommended Operating Conditions
Parameter
Supply Voltage for -7/-8/-10/-12
Input High Voltage
Input Low Voltage
Ambient Temperature,
Commercial Range
Ambient Temperature,
Industrial Range
Symbol
V
DD
V
IH
V
IL
T
Ac
T
A
I
Min
3.0
2.0
–0.3
0
–40
Typ
3.3
—
—
—
—
Max
3.6
V
DD
+0.3
0.8
70
85
Unit
V
V
V
o
C
o
C
Notes:
1. Input overshoot voltage should be less than V
DD
+2 V and not exceed 20 ns.
2. Input undershoot voltage should be greater than –2 V and not exceed 20 ns.
Capacitance
Parameter
Input Capacitance
Output Capacitance
Symbol
C
IN
C
OUT
Test Condition
V
IN
= 0 V
V
OUT
= 0 V
Max
5
7
Unit
pF
pF
Notes:
1. Tested at T
A
= 25°C, f = 1 MHz
2. These parameters are sampled and are not 100% tested.
DC I/O Pin Characteristics
Parameter
Input Leakage
Current
Output Leakage
Current
Output High Voltage
Output Low Voltage
Symbol
I
IL
I
LO
V
OH
V
OL
Test Conditions
V
IN
= 0 to V
DD
Output High Z
V
OUT
= 0 to V
DD
I
OH
= –4mA
I
LO
= +4mA
Min
–
1 uA
–1
uA
2.4
—
Max
1 uA
1 uA
—
0.4 V
Rev: 1.07a 4/2009
4/11
© 2001, GSI Technology
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
GS72108ATP
Power Supply Currents
Parameter
Symbol
Test Conditions
CE
V
IL
All other inputs
V
IH
or
V
IL
Min. cycle time
I
OUT
= 0 mA
CE
V
IH
All other inputs
V
IH
or
V
IL
Min. cycle time
CE
V
DD
- 0.2 V
All other inputs
V
DD
–
0.2 V or
0.2
V
0 to 70°C
7 ns
8 ns
10 ns
12 ns
7 ns
–40
to 85°C
8 ns
10 ns
12 ns
Operating
Supply
Current
I
DD
(max)
135 mA
115 mA
95 mA
80 mA
140 mA
120 mA
100 mA
85 mA
Standby
Current
I
SB1
(max)
25 mA
20 mA
20 mA
15 mA
30 mA
25 mA
25 mA
20 mA
Standby
Current
I
SB2
(max)
5 mA
10 mA
AC Test Conditions
Parameter
Input high level
Input low level
Input rise time
Input fall time
Input reference level
Output reference level
Output load
Conditions
V
IH
= 2.4 V
V
IL
= 0.4 V
tr = 1 V/ns
tf = 1 V/ns
1.4 V
1.4 V
Fig. 1& 2
Output Load 1
DQ
50
VT = 1.4 V
30pF
1
Output Load 2
3.3 V
DQ
5pF
1
589
434
Notes:
1. Include scope and jig capacitance.
2. Test conditions as specified with output loading as shown in
Fig. 1
unless otherwise noted.
3. Output load 2 for t
LZ
, t
HZ
, t
OLZ
and t
OHZ
Rev: 1.07a 4/2009
5/11
© 2001, GSI Technology
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
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