Ordering number : EN5823
CMOS IC
LC35256D-10, LC35256DM, DT-70/10
Dual Control Pins: OE and CE
256K (32768-word
×
8-bit) SRAM
Overview
The LC35256D, LC35256DM, and LC35256DT are
32768-word
×
8-bit asynchronous silicon gate CMOS
static RAMs. These devices use a 6-transistor full CMOS
memory cell, and feature low-voltage operation, low
current drain, and an ultralow standby current. They
provide two control signal inputs: an OE input for high-
speed access and a chip select (CE) input for device
selection and low power operating mode. This makes
these devices optimal for systems that require low power
or battery backup, and they allow memory to be expanded
easily. Their ultralow standby current allows capacitor-
based backup to be used as well. Since they support 3-V
operation, they are appropriate for use in portable systems
that operate from batteries.
Package Dimensions
unit: mm
3012A-DIP28
[LC35256D]
SANYO: DIP28
unit: mm
3187-SOP28D
[LC35256DM]
Features
• Supply voltage range: 2.7 to 5.5 V
— 5-V operation:
5.0 V±10%
— 3-V operation:
2.7 to 3.6 V
• Access times
— 5-V operation
LC35256DM, DT-70: 70 ns (max)
LC35256D, DM, DT-10: 100 ns (max)
— 3-V operation
LC35256DM, DT-70: 200 ns (max)
LC35256D, DM, DT-10: 500 ns (max)
• Standby current
— 5-V operation: 1.0 µA (Ta
≤
60°C),
5.0 µA (Ta
≤
85°C)
— 3-V operation: 0.8 µA (Ta
≤
60°C),
4.0 µA (Ta
≤
85°C)
• Operating temperature range: –40 to +85°C
• Data retention supply voltage: 2.0 to 5.5 V
• All I/O levels
— 5-V operation: TTL compatible
— 3-V operation: V
CC
– 0.2 V/0.2 V
• Shared I/O pins and 3-state outputs
• No clock signal required.
• Packages
— 28-pin DIP (600 mil) plastic package: LC35256D
— 28-pin SOP (450 mil) plastic package: LC35256DM
— 28-pin TSOP (8
×
13.4 mm) plastic package:
LC35256DT
SANYO: SOP28D
unit: mm
3221-TSOP28(type-I)
[LC35256DT]
SANYO: TSOP28(type-I)
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
51398RM (OT) No. 5823-1/8
LC35256D-10, LC35256DM, DT-70/10
Function Table
Mode
Read cycle
Write cycle
Output disable
Unselected
X : H or L
CE
L
L
L
H
OE
L
X
H
X
WE
H
L
H
X
I/O
Data output
Data input
High-impedance
High-impedance
Supply current
I
CCA
I
CCA
I
CCA
I
CCS
Specifications
Absolute Maximum Ratings
Parameter
Maximum supply voltage
Input pin voltage
I/O pin voltage
Operating temperature
Storage temperature
Note
*:
–3.0 V for pulse widths of up to 30 ns.
Symbol
V
CC
max
V
IN
V
I/O
Topr
Tstg
Conditions
Ratings
7.0
–0.3* to V
CC
+ 0.3
–0.3 to V
CC
+ 0.3
–40 to +85
–55 to +125
Unit
V
V
V
°C
°C
I/O Capacitances
at Ta = 25°C, f = 1 MHz
Parameter
I/O pin capacitance
Input pin capacitance
Symbol
C
I/O
C
IN
V
I/O
= 0 V
V
IN
= 0 V
Conditions
Ratings
min
typ
6
6
max
10
10
Unit
pF
pF
Note: These parameters are not measured in all units, but rather are only measured in sampled units.
[5-V Operation]
DC Allowable Operating Ranges
at Ta = –40 to +85°C, V
CC
= 4.5 to 5.5 V
Parameter
Supply voltage
Input voltages
Symbol
V
CC
V
IH
V
IL
Conditions
Ratings
min
4.5
2.2
–0.3*
typ
5.0
max
5.5
V
CC
+ 0.3
+0.8
Unit
V
V
V
Note
*:
–3.0 V for pulse widths of up to 30 ns.
DC Electrical Characteristics
at Ta = –40 to +85°C, V
CC
= 4.5 to 5.5 V
Parameter
Input leakage current
Output leakage current
High-level output voltage
Low-level output voltage
Symbol
I
LI
I
LO
V
OH
V
OL
I
CCA2
Operating
current drain
TTL inputs
I
CCA3
V
CE
= V
IL
, V
IN
= V
IH
or V
IL
,
I
I/O
= 0 mA, Duty 100%
V
CE
≥
V
CC
– 0.2 V,
V
IN
= 0 to V
CC
V
CE
= V
IH
, V
IN
= 0 to V
CC
V
IN
= 0 to V
CC
V
CE
= V
IH
or V
OE
= V
IH
or V
WE
= V
IL
, V
I/O
= 0 to V
CC
I
OH
= –1.0 mA
I
OL
= 2.0 mA
V
CE
= V
IL
, I
I/O
= 0 mA, V
IN
= V
IH
or V
IL
min
LC35256DM, DT-70
35
25
3.5
Ta
≤
25°C
Ta
≤
60°C
Ta
≤
85°C
0.01
1.0
5.0
1.0
cycle LC35256D, DM, DT-10
1 µs cycle
Conditions
Ratings
min
–1.0
–1.0
2.4
0.4
5.0
40
30
6.0
typ*
max
+1.0
+1.0
Unit
µA
µA
V
V
mA
mA
mA
mA
µA
µA
µA
mA
Standby mode
current drain
V
CC
– 0.2 V/
0.2 V inputs
TTL inputs
I
CCS1
I
CCS2
Note
*:
Reference value at Ta = 25°C, V
CC
= 5 V.
No. 5823-3/8
LC35256D-10, LC35256DM, DT-70/10
AC Electrical Characteristics
at Ta = –40 to +85°C, V
CC
= 4.5 to 5.5 V
AC test conditions
Input pulse voltage level
Input rise and fall times
Input and output timing level
Output load
LC35256DM, DT-70
LC35256D, DM, DT-10
V
IH
= 2.4 V, V
IL
= 0.6 V
5 ns
1.5 V
One TTL gate + 30 pF (Including jig capacitances.)
One TTL gate + 100 pF (Including jig capacitances.)
Read Cycle
LC35256D, DM, DT
Parameter
Symbol
min
Read cycle time
Address access time
CE access time
OE access time
Output hold time
CE output enable time
OE output enable time
CE output disable time
OE output disable time
t
RC
t
AA
t
CA
t
OA
t
OH
t
COE
t
OOE
t
COD
t
OOD
10
10
5
30
25
70
70
70
35
10
10
5
30
25
-70*
max
min
100
100
100
50
-10
max
ns
ns
ns
ns
ns
ns
ns
ns
ns
Unit
Note
*:
Specification values for the LC35256DM and LC35256DT.
Write Cycle
LC35256D, DM, DT
Parameter
Symbol
min
Write cycle time
Address setup time
Write pulse width
CE setup time
Write recovery time
CE write recovery time
Data setup time
Data hold time
CE data hold time
WE output enable time
WE output disable time
t
WC
t
AS
t
WP
t
CW
t
WR
t
WR1
t
DS
t
DH
t
DH1
t
WOE
t
WOD
70
0
55
60
0
0
35
0
0
5
30
-70*
max
min
100
0
60
70
0
0
40
0
0
5
30
-10
max
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Unit
Note
*:
Specification values for the LC35256DM and LC35256DT.
[3-V Operation]
DC Allowable Operating Ranges
at Ta = –40 to +85°C, V
CC
= 2.7 to 3.6 V
Parameter
Supply voltage
Input voltages
Symbol
V
CC
V
IH
V
IL
Conditions
Ratings
min
2.7
V
CC
– 0.2
–0.3*
typ
3.0
max
3.6
V
CC
+ 0.3
+0.2
Unit
V
V
V
Note
*:
–2.0 V for pulse widths of up to 30 ns.
No. 5823-4/8
LC35256D-10, LC35256DM, DT-70/10
DC Electrical Characteristics
at Ta = –40 to +85°C, V
CC
= 2.7 to 3.6 V
Parameter
Input leakage current
Output leakage current
High-level output voltage
Low-level output voltage
Operating
current drain
V
CC
– 0.2 V/
0.2 V inputs
Symbol
I
LI
I
LO
V
OH
V
OL
I
CCA4
V
IN
= 0 to V
CC
V
CE
= V
IH
or V
OE
= V
IH
or V
WE
= V
IL
, V
I/O
= 0 to V
CC
I
OH
= –0.5 mA
I
OL
= 1.0 mA
min
V
CE
= V
IL
, V
IN
= V
IH
or V
IL
,
I
I/O
= 0 mA, Duty 100%
V
CE
≥
V
CC
– 0.2 V,
V
IN
= 0 to V
CC
LC35256DM, DT-70
7
3
1.5
Ta
≤
25°C
Ta
≤
60°C
Ta
≤
85°C
0.01
0.8
4.0
cycle LC35256D, DM, DT-10
1 µs cycle
Conditions
Ratings
min
–1.0
–1.0
V
CC
– 0.2
0.2
10
5
2.5
typ*
max
+1.0
+1.0
Unit
µA
µA
V
V
mA
mA
mA
µA
µA
µA
Standby mode
current drain
V
CC
– 0.2 V/
0.2 V inputs
I
CCS1
Note
*:
Reference value at Ta = 25°C, V
CC
= 3 V.
AC Electrical Characteristics
at Ta = –40 to +85°C, V
CC
= 2.7 to 3.6 V
AC test conditions
Input pulse voltage level
Input rise and fall times
Input and output timing level
Output load
LC35256DM, DT-70
LC35256D, DM, DT-10
V
IH
= V
CC
– 0.2 V, V
IL
= 0.2 V
10 ns
1.5 V
30 pF (Including jig capacitances.)
100 pF (Including jig capacitances.)
Read Cycle
LC35256D, DM, DT
Parameter
Symbol
min
Read cycle time
Address access time
CE access time
OE access time
Output hold time
CE output enable time
OE output enable time
CE output disable time
OE output disable time
t
RC
t
AA
t
CA
t
OA
t
OH
t
COE
t
OOE
t
COD
t
OOD
20
20
10
60
50
200
200
200
100
20
20
10
120
100
-70*
max
min
500
500
500
250
-10
max
ns
ns
ns
ns
ns
ns
ns
ns
ns
Unit
Note
*:
Specification values for the LC35256DM and LC35256DT.
No. 5823-5/8
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