SANYO LC35256D-10, LC35256DT-10, LC35256DM-70, LC35256DM-10, LC35256DT-70 Datasheet
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 highspeed 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 capacitorbased backup to be used as well. Since they support 3-V
operation, they are appropriate for use in portable systems
that operate from batteries.
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: VCC– 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
Package Dimensions
unit: mm
3012A-DIP28
unit: mm
3187-SOP28D
unit: mm
3221-TSOP28(type-I)
CMOS IC
51398RM (OT) No. 5823-1/8
SANYO: DIP28
[LC35256D]
SANYO: SOP28D
[LC35256DM]
SANYO: TSOP28(type-I)
[LC35256DT]
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
Dual Control Pins: OE and CE
256K (32768-word × 8-bit) SRAM
LC35256D-10, LC35256DM, DT-70/10
Ordering number : EN5823
Pin Assignment
No. 5823-2/8
LC35256D-10, LC35256DM, DT-70/10
Block Diagram
Pin Functions
A0 to A14 Address inputs
WE Read/write control input
OE Output enable input
CE Chip enable input
I/O1 to I/O8 Data I/O
V
CC
, GND Power supply, ground
Address buffer
Address buffer
Input data buffer
Input data
control circuit
Row decoder
Memory cell array
Column
I/O circuit
Output
data
buffer
Column
decoder
No. 5823-3/8
LC35256D-10, LC35256DM, DT-70/10
Function Table
X : H or L
Note *: –3.0 V for pulse widths of up to 30 ns.
Note: These parameters are not measured in all units, but rather are only measured in sampled units.
Note *: –3.0 V for pulse widths of up to 30 ns.
Note *: Reference value at Ta = 25°C, V
CC
= 5 V.
Mode CE OE WE I/O Supply current
Read cycle L L H Data output I
CCA
Write cycle L X L Data input I
CCA
Output disable L H H High-impedance I
CCA
Unselected H X X High-impedance I
CCS
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
CC
max 7.0 V
Input pin voltage V
IN
–0.3* to VCC+ 0.3 V
I/O pin voltage V
I/O
–0.3 to VCC+ 0.3 V
Operating temperature Topr –40 to +85 °C
Storage temperature Tstg –55 to +125 °C
Specifications
Absolute Maximum Ratings
Parameter Symbol Conditions
Ratings
Unit
min typ max
I/O pin capacitance C
I/OVI/O
= 0 V 6 10 pF
Input pin capacitance C
IN
VIN= 0 V 6 10 pF
I/O Capacitances at Ta = 25°C, f = 1 MHz
[5-V Operation]
Parameter Symbol Conditions
Ratings
Unit
min typ max
Supply voltage V
CC
4.5 5.0 5.5 V
Input voltages
V
IH
2.2 VCC+ 0.3 V
V
IL
–0.3* +0.8 V
DC Allowable Operating Ranges at Ta = –40 to +85°C, VCC= 4.5 to 5.5 V
Parameter Symbol Conditions
Ratings
Unit
min typ* max
Input leakage current I
LI
VIN= 0 to V
CC
–1.0 +1.0 µA
Output leakage current I
LO
VCE= VIHor VOE= VIHor VWE= VIL, V
I/O
= 0 to V
CC
–1.0 +1.0 µA
High-level output voltage V
OHIOH
= –1.0 mA 2.4 V
Low-level output voltage V
OLIOL
= 2.0 mA 0.4 V
I
CCA2VCE
= VIL, I
I/O
= 0 mA, VIN= VIHor V
IL
5.0 mA
Operating
TTL inputs V
CE
= VIL, VIN= VIHor VIL,
min LC35256DM, DT-70 35 40 mA
current drain I
CCA3
I
I/O
= 0 mA, Duty 100%
cycle LC35256D, DM, DT-10 25 30 mA
1 µs cycle 3.5 6.0 mA
V
CC
– 0.2 V/ VCE≥ VCC– 0.2 V,
Ta ≤ 25°C 0.01 µA
Standby mode
0.2 V inputs
I
CCS1
VIN= 0 to V
CC
Ta ≤ 60°C 1.0 µA
current drain Ta ≤ 85°C 5.0 µA
TTL inputs I
CCS2VCE
= VIH, VIN= 0 to V
CC
1.0 mA
DC Electrical Characteristics at Ta = –40 to +85°C, VCC= 4.5 to 5.5 V
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