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AS6C62256-55PCN

AS6C62256-55PCN

Alliance Memory, Inc.
SRAM - Asynchronous Memory IC 256Kbit Parallel 55 ns 28-PDIP
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Overview

The AS6C62256-55PCN is a 256Kbit low-power CMOS static RAM organized as 32,768 words by 8 bits. It operates from a wide supply voltage range of 2.7V to 5.5V, making it compatible with both legacy 5V TTL logic and modern 3.3V systems. This asynchronous SRAM features a 55ns access time and is housed in a user-friendly 28-pin DIP package.

Why Choose This Part

The 28-pin PDIP package allows for easy prototyping on breadboards and socketed PCBs without specialized soldering equipment. Its extremely low standby current of 1uA makes it ideal for battery-backed applications, while the 55ns access time ensures compatibility with high-speed 8-bit microprocessors.

Applications

Legacy System Maintenance
Replacement memory for vintage 8-bit computers and industrial controllers using Z80, 6502, or 8051 architectures.
Microcontroller Buffer Expansion
Providing external data workspace for MCUs with parallel bus interfaces that require more RAM than available on-chip.
Battery-Backed Data Logging
Utilizing the ultra-low 1uA standby current for long-term data retention in low-power portable instruments.
Educational Logic Circuits
Easy integration into breadboard-based digital logic projects to teach memory addressing and bus timing.

Key Specifications

Technology SRAM - Asynchronous
Access Time 55 ns
Memory Size 256Kbit
Memory Type Volatile
Memory Format SRAM
Mounting Type Through Hole
Package / Case 28-DIP (0.600", 15.24mm)
Memory Interface Parallel
Voltage - Supply 2.7V ~ 5.5V
Memory Organization 32K x 8
Operating Temperature 0degC ~ 70degC (TA)
Supplier Device Package 28-PDIP
Write Cycle Time - Word, Page 55ns

Getting Started

To use this SRAM, connect the 15 address lines (A0-A14) and 8 data lines (I/O0-I/O7) to your controller's parallel bus. Ensure the Chip Enable (CE), Output Enable (OE), and Write Enable (WE) pins are managed according to the 55ns timing requirements. For breadboarding, add a 0.1uF ceramic decoupling capacitor close to the VCC and GND pins (pins 28 and 14).

AS6C62256-55 Family

Part NumberDifferenceStock
AS6C62256-55STIN (Alliance Memory) STIN 717