Description
The TC55257BPI 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
5mA/MHz (typ.) and a minimum cycle time of 100ns.
When CE is a logical high, the device is placed in a low power standby mode in which the standby current is 2uA at room tem-
perature. The TC55257BPI 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 TC55257BPI is suitable for use in microprocessor systems where high
speed, low power, and battery backup are required. The TC55257BPI has an operating temperature range of -40 - 85°C so it is
suitable for use in wide operating temperature systems.
The TC55257BPI is offered in a standard dual-in-line 28-pin plastic package (0.6/0.3 inch width), a small outline plastic pack-
age, and a thin small outline plastic package (forward type, reverse type).

Features
• Low power
• Standby current:
Single 5V power supply
• Access time (max.)
dissipation:
Access Time
Chip Enable
Access Time
Output Enable Time
27.5mW/MHz (typ.)
2μA at Ta = 25°C (max.)
TC55257BPI/BFI/BSPI/BFTI/BTRI-10L
100ns
100ns
50ns
• Power down feature:
CE
• Data retention supply voltage:
Wide operating temperature:
• Inputs and outputs TTL compatible
• Package
TC55257BPI
: DIP28-P-600
TC55257BFI
TC55257BSPI
: SOP28-P-450
: DIP28-P-300B
: TSOP28-P
TC55257BFTI
TC55257BTRI : TSOP28-P-A
2.0-5.5V
-40 - 85°C