This document is a general product description and is subject to change without notice. Hynix Electronics does not assume any
responsibility for use of circuits described. No patent licenses are implied.
Rev 03 / Apr. 2001 Hynix Semiconductor
GM76C256C
Series
32Kx8bit CMOS SRAM
Document Title
32K x8 bit 5.0V Low Power CMOS slow SRAM
Revision History
Revision No History Draft Date Remark
00 Revision History Insert Jul.07.2000 Final
Revised
- Datasheet format change
- PDIP package type insert
- Pin configuration change
01 Revised Nov.28.2000 Final
- tWP Value Change @55ns : 45ns -> 40ns
02 Marking Information Add Dec.04.2000 Final
Revised
- AC Test Condition Add : 5pF Test Load
- tCLZ Value Change : 5ns - > 10ns
03 Changed Logo Apr.30.2001 Final
- HYUNDAI -> hynix
GM76C256C Series
Rev 03 / Apr. 2000
2
DESCRIPTION
The GM76C256C is a high-speed, low power and
32,786 X 8-bits CMOS Static Random Access
Memory fabricated using Hynix's high
performance CMOS process technology. It is
suitable for use in low voltage operation and
battery back-up application. This device has a
data retention mode that guarantees data to
remain valid at the minimum power supply
voltage of 2.0 volt.
FEATURES
Fully static operation and Tri-state output
TTL compatible inputs and outputs
Low power consumption
Battery backup(L/LL-part)
- 2.0V(min.) data retention
Standard pin configuration
- 28 pin 600mil PDIP
- 28 pin 330mil SOP
- 28 pin 8x13.4 mm TSOP-I
(Standard)
Product
Voltage
Speed
Operation
Standby Current(uA)
Temperature
No.
(V)
(ns)
Current(mA)
L
LL
(
C)
GM76C256C
5.0
55/70/85
10
40
20
0~70(Normal)
GM76C256CE
5.0
55/70/85
10
60
30
-25~85(Extended)
Note 1. Current value is max.
PIN CONNECTION
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
A8
A9
A11
/OE
A10
/CS
I/O8
I/O7
I/O6
I/O5
I/O4
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
I/O1
I/O2
I/O3
Vss
A13
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
A8
A9
A11
/OE
A10
/CS
I/O8
I/O7
I/O6
I/O5
I/O4
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
I/O1
I/O2
I/O3
Vss
A13
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/O7
I/O6
I/O5
I/O4
Vss
I/O3
I/O2
I/O1
A0
A1
A2
/OE
A11
A9
A8
A13
/WE
Vcc
A14
A12
A7
A6
A5
A4
A3
I/O8
PDIP SOP TSOP-I(Standard)
PIN DESCRIPTION BLOCK DIAGRAM
Pin Name
Pin Function
/CS
Chip Select
/WE
Write Enable
/OE
Output Enable
A0 ~ A14
Address Inputs
I/O1 ~ I/O8
Data Input/Output
Vcc
Power(
+
5.0V)
Vss
Ground
A14
COLUMN DECODER
A0
ROW DECODER
MEMORY ARRAY
512x512
SENSE AMP
OUTPUT BUFFER
I/O1
I/O8
ADD INPUT BUFFER
/CS
/OE
/WE
WRITE DRIVER
CONTROL
LOGIC
GM76C256C Series
Rev 03 / Apr. 2000
2
ORDERING INFORMATION
Part No.
Speed
Power
Temp
Package
GM76C256CL
55/70/85
L-part
0 to 70
C PDIP
GM76C256CLL
55/70/85
LL-part
0 to 70
C PDIP
GM76C256CLE
55/70/85
L-part -25 to 85
C PDIP
GM76C256CLLE
55/70/85
LL-part -25 to 85
C PDIP
GM76C256CLFW
55/70/85
L-part
0 to 70
C SOP
GM76C256CLLFW
55/70/85
LL-part
0 to 70
C SOP
GM76C256CLEFW
55/70/85
L-part -25 to 85
C SOP
GM76C256CLLEFW
55/70/85
LL-part -25 to 85
C SOP
GM76C256CLT
55/70/85
L-part
0 to 70
C TSOP-I Standard
GM76C256CLLT
55/70/85
LL-part
0 to 70
C TSOP-I Standard
GM76C256CLET
55/70/85
L-part -25 to 85
C TSOP-I Standard
GM76C256CLLET
55/70/85
LL-part -25 to 85
C TSOP-I Standard
ABSOLUTE MAXIMUM RATING (1)
Symbol
Parameter
Rating
Unit
Vcc, V
IN,
V
OUT
Power Supply, Input/Output Voltage
-0.3 to 7.0
V
T
A
Operating Temperature
GM76C256C
0 to 70
C
GM76C256CE
-25 to 85
C
T
STG
Storage Temperature
-65 to 150
C
P
D
Power Dissipation
1.0
W
I
OUT
Data Output Current
50
mA
T
SOLDER
Lead Soldering Temperature & Time
260
10
C
sec
Note
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent
damage to the device. This is stress rating only and the functional operation of the device under these or
any other conditions above those indicated in the operation of this specification is not implied.
Exposure to the absolute maximum rating conditions for extended period may affect reliability.
RECOMMENDED DC OPERATING CONDITIONS
Symbol
Parameter
Min.
Typ.
Max.
Unit
Vcc
Power Supply Voltage
4.5
5.0
5.5
V
Vss
Ground
0
0
0
V
V
IH
Input High Voltage
2.2
-
Vcc+0.3
V
V
IL
Input Low Voltage
-0.3
(1)
-
0.8
V
Note
1. V
IL
= -3.0V for pulse width less than 50ns
TRUTH TABLE
/CS /WE /OE
Mode
I/O Operation
H
X
X Standby
High-Z
L
H
H Output Disabled High-Z
L
H
L Read
Data Out
L
L
X Write
Data In
Note
1. H=V
IH
, L=V
IL
, X=Don't Care
GM76C256C Series
Rev 03 / Apr. 2000
3
DC CHARACTERISTICS
Vcc = 5V
10%, T
A
= 0
C to 70
C (Normal)/-25
C to 85
C (Extended), unless otherwise specified.
Symbol
Parameter
Test Condition
Min. Typ. Max. Unit
I
LI
Input Leakage Current
Vss < V
IN
< Vcc
-1
-
1
uA
I
LO
Output Leakage Current
Vss < V
OUT
< Vcc, /CS = V
IH
or
/
OE
=
V
IH
or /WE = V
IL
-1
-
1
uA
Icc
Operating Power Supply
Current
/CS = V
IL
, V
IN
= V
IH
or V
IL,
V
IN
= V
IH
or V
IL,
I
I/O =
0mA
-
-
10
mA
I
CC1
Average Operating Current /CS = V
IL,
V
IN
= V
IH
or V
IL,
Min. Duty Cycle = 100%, I
I/O =
0mA
-
-
70
mA
I
SB
TTL Standby Current
(TTL Inputs)
/CS= V
IH
V
IN
= V
IH
or V
IL
-
-
1
mA
I
SB1
CMOS Standby Current
/CS > Vcc - 0.2V,
L
-
-
40
uA
(CMOS Inputs)
V
IN
> Vcc - 0.2V or
LL
-
-
20
uA
V
IN
< Vss + 0.2V
LE
-
-
60
uA
LLE
-
-
30
uA
V
OL
Output Low Voltage
I
OL
= 2.1mA
-
-
0.4
V
V
OH
Output High Voltage
I
OH =
-1.0mA
2.4
-
-
V
Note : Typical values are at Vcc =5.0V, T
A
= 25
C
AC CHARACTERISTICS(I)
Vcc = 5V
10%, T
A
= 0
C to 70
C (Normal) / -25
C to 85
C (Extended) unless otherwise specified.
-55
-70
-85
Min. Max. Min. Max. Min
Max.
1 tRC
Read Cycle Time
55
-
70
-
85
-
ns
2 tAA
Address Access Time
-
55
-
70
-
85
ns
3 tACS
Chip Select Access Time
-
55
-
70
-
85
ns
4 tOE
Output Enable to Output Valid
-
30
-
35
-
45
ns
5 tCLZ
Chip Select to Output in Low Z
10
-
10
-
10
-
ns
6 tOLZ
Output Enable to Output in Low Z
5
-
5
-
5
-
ns
7 tCHZ
Chip Disable to Output in High Z
0
20
0
30
0
30
ns
8 tOHZ
Out Disable to Output in High Z
0
20
0
30
0
30
ns
9 tOH
Output Hold from Address Change
5
-
5
-
5
-
ns
10 tWC
Write Cycle Time
55
-
70
-
85
-
ns
11 tCW
Chip Selection to End of Write
50
-
65
-
75
-
ns
12 tAW
Address Valid to End of Write
50
-
65
-
75
-
ns
13 tAS
Address Set-up Time
0
-
0
-
0
-
ns
14 tWP
Write Pulse Width
40
-
50
-
60
-
ns
15 tWR
Write Recovery Time
0
-
0
-
0
-
ns
16 tWHZ Write to Output in High Z
0
20
0
25
0
30
ns
17 tDW
Data to Write Time Overlap
25
-
30
-
40
-
ns
18 tDH
Data Hold from Write Time
0
-
0
-
0
-
ns
19 tOW
Output Active from End of Write
5
-
5
-
5
-
ns
READ CYCLE
WRITE CYCLE
Symbol
Parameter
#
Unit
GM76C256C Series
Rev 03 / Apr. 2000
4
AC TEST CONDITIONS
T
A
= 0
C to 70
C (Normal) / -25
C to 85
C (Extended) unless otherwise specified.
Parameter
Value
Input Pulse Level
0.8V to 2.4V
Input Rise and Fall Time
5ns
Input and Output Timing Reference Level
1.5V
Output Load
tCLZ,tOLZ,tCHZ,tOHZ,tWHZ,tOW
CL = 5pF + 1TTL Load
Others
CL = 100pF + 1TTL Load
AC TEST LOADS
CL(1)
TTL
Note : Including jig and scope capacitance
CAPACITANCE
T
A
= 25
C, f = 1.0MHz
Symbol
Parameter
Condition
Max.
Unit
C
IN
Input Capacitance
V
IN
= 0V
6
pF
C
I/O
Input /Output Capacitance
V
I/O
= 0V
8
pF
Note : These parameters are sampled and not 100% tested
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