Description
The TC55257BPL is a 262,144 bit CMOS static random access memory organized as 32,768 words by 8 bits and operated from a
single 5V power supply. Advanced circuit techniques provide both high speed and low power features with an operating current of
5mNMHz (typ.) and a minimum cycle time of 85ns.
When CE is a logical high, the device is placed in a low power standby mode in which the standby current is 2~ at room temperature. The TC55257BPL has two control inputs. Chip enable (CE) allows for device selection and data retention control, while an
output enable input (OE) provides fast memory access. The TC55257BPL is suitable for use in microprocessor systems where high
speed, low power, and battery backup are required. The TC55257BPL-(LT) has an operating temperature range of -20 - 7CfC so it
is suitable for use in low temperature applications.
The TC55257BPL is offered in a standard dual-in-line 28-pin plastic package (0.6/0.3 inch width), a small outline plastic package, and a thin small outline plastic package (forward type, reverse type).

Features
• Low power dissipation:
• Standby current:
• Single 5V power supply
• Access time (max.)
27.5mW/MHz (typ.)
100~(max.)
TC55257BPL/ TC55257BPL/
B FL/BS PL/B FTL/ BFL/BSPL/BFTL/
BTRL-85(LT) BTRL-10(LT)
Access Time
Chip Enable Access Time
Output Enable Time
• Power down feature: CE
• Data retention supply voltage:
• Wide operating temperature:
• Inputs and outputs TIL compatible
85ns
85ns
45ns
2.0 - 5.5V
-20 - 70°C
100ns
100ns
50ns
• Package TC55257BPL(LT): DIP28-P-600
TC55257BFL(LT) : SOP28-P-450
TC55257BSPL(LT) : DIP28-P-300B
TC55257BFTL(LT) : TSOP28-P
TC55257BTRL(LT) : TSOP28-P-A