UPD43256B-X Datasheet, PDF (1/20 Pages) NEC – 256K-BIT CMOS STATIC RAM 32K-WORD BY 8-BIT EXTENDED TEMPERATURE OPERATION

DATA SHEET
MOS INTEGRATED CIRCUIT
µPD43256B-X
256K-BIT CMOS STATIC RAM
32K-WORD BY 8-BIT
EXTENDED TEMPERATURE OPERATION
Description
The µPD43256B-X is a high speed, low power, and 262,144 bits (32,768 words by 8 bits) CMOS static RAM.
The µPD43256B-X is an extended-operating-temperature version of the µPD43256B (X version : TA = –25 to +85
°C). And A and B versions are low voltage operations. Battery backup is available.
The µPD43256B-X is packed in 28-pin plastic TSOP (I) (8 x 13.4 mm).
Features
• 32,768 words by 8 bits organization
• Fast access time: 70, 85, 100, 120, 150 ns (MAX.)
• Operating ambient temperature: TA = –25 to +85 °C
• Low voltage operation (A version: VCC = 3.0 to 5.5 V, B version: VCC = 2.7 to 5.5 V)
• Low VCC data retention: 2.0 V (MIN.)
• /OE input for easy application
Part number
Access time
Operating supply Operating ambient
ns (MAX.)
voltage
temperature
At operating
V
°C
mA (MAX.)
• µPD43256B-xxX
70, 85
4.5 to 5.5
−25 to +85
45
µPD43256B-AxxX
85 , ^Note2 100, 120 ^Note2
3.0 to 5.5
µPD43256B-BxxX ^Note2 100, 120 , ^Note2 150 ^Note2
2.7 to 5.5
40
Notes 1. TA ≤ 40 °C, VCC = 3.0 V
2. 100 s (MAX.) (VCC = 4.5 to 5.5 V)
Supply current
At standby
µA (MAX.)
At data retention
µA (MAX.) ^Note1
50
2
Version X
This Data sheet can be applied to the version X. Each version is identified with its lot number. Letter X in the fifth
character position in a lot number signifies version X.
D43256B-X
JAPAN
Lot number
The information in this document is subject to change without notice. Before using this document, please
confirm that this is the latest version.
Not all devices/types available in every country. Please check with local NEC representative for
availability and additional information.
Document No. M11012EJ4V0DSJ1 (4th edition)
The mark 5 shows major revised points.
Date Published December 2000 NS CP (K)
Printed in Japan
©
1995