DATA SHEET
MOS INTEGRATED CIRCUIT
µPD43257B
256K-BIT
CMOS STATIC RAM 32K-WORD BY 8-BIT
Description
The µPD43257B is a high speed, low power, and 262,144 bits (32,768 words by 8 bits)
CMOS static RAM.
Battery backup is available.
And the µPD43257B has two chip enable pins (/CE1, CE2) to extend the capacity.
The µPD43257B is packed in 28-pin plastic DIP and 28-pin plastic SOP.
Features
• 32,768 words by 8 bits organization • Fast access time: 70, 85 ns (MAX.
) • Low VCC data retention: 2.
0 V (MIN.
) • Two Chip Enable inputs: /CE1, CE2
Part number Access time ns (MAX.
) Operating supply Operating ambient
voltage V temperature °C 0 to 70 At operating mA (MAX.
) 45 45 Supply current At standby A...