Infineon Technologies CY7C128A-20VC

Overview

CY7C128A-20VC from Cypress Semiconductor is a 2K × 8 CMOS static RAM organized as 2048 words by 8 bits, featuring 20 ns maximum access time, TTL-compatible I/O, automatic CE-controlled power-down (reducing standby current to 20 mA), and operation at 5V ±10% over 0°C to +70°C. It serves as non-volatile data buffer in legacy industrial controllers requiring deterministic read/write timing and low-power deselected state.

For engineers reviewing the CY7C128A-20VC datasheet, CY7C128A-20VC pinout, CY7C128A-20VC application, or CY7C128A-20VC equivalent, key selection criteria include verified 24-pin SOJ package compatibility, guaranteed 20 ns tAA/tRC timing under commercial temperature range, CE/OE/WE three-control logic interface, and 20 mA ISB2 standby current specification.

Technical Context

The CY7C128A-20VC implements a fully asynchronous SRAM architecture with independent address decoding (A0–A10), bidirectional 8-bit I/O bus (I/O0–I/O7), and three-state output drivers controlled by CE (active-low chip enable), OE (active-low output enable), and WE (active-low write enable). No internal refresh or clocking circuitry is present.

Power management relies solely on CE-driven automatic power-down: when CE is high, ICC drops to 20 mA (ISB2) while maintaining data retention; all I/O pins enter high-impedance state unless OE and CE are simultaneously asserted during read or WE and CE during write.

Key Specifications

Pinout & Package

Package: 24-pin molded SOJ (Small Outline J-Lead), 300-mil width, lead pitch 0.050 inch, JEDEC MS-012AC compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar static RAM applications.

Compared with AS6C1008-20TIN and IS61LV25616AL-20TQLI, the CY7C128A-20VC uniquely delivers 20 mA CE-triggered standby current in a 5V 2K×8 SOJ package-critical for retrofitting power-constrained legacy 5V systems without changing board layout or supply rails.

Availability

CY7C128A-20VC is available at Aetrix Electronics and suitable for industrial PLC data buffering, legacy telecom line card caching, and avionics sensor interface modules requiring stable component supply and long-term obsolescence management.

Supply support for CY7C128A-20VC includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Cypress Semiconductor (now part of Infineon Technologies) is a U.S.-based semiconductor company specializing in memory, microcontrollers, and programmable logic solutions for industrial, automotive, and communications markets.

The CY7C128A belongs to Cypress's legacy parallel SRAM product line, designed specifically for 5V embedded systems requiring pin-compatible replacements for aging NMOS and early CMOS memory devices.

FAQ

Is CY7C128A-20VC compatible with 3.3V I/O systems?

No. The CY7C128A-20VC is specified only for 5V ±10% operation. Its VIH minimum is 2.2V and VOL maximum is 0.4V under 5V supply conditions. Interfacing with 3.3V logic requires level-shifting circuitry to prevent input overvoltage and ensure proper logic threshold margins.

What happens to stored data when CE is held HIGH for extended periods?

Data retention is guaranteed as long as VCC remains within 4.5V–5.5V and ambient temperature stays between 0°C and +70°C. The automatic power-down mode reduces ICC to 20 mA but maintains full SRAM cell bias-no refresh or data loss occurs during indefinite CE-HIGH standby.

Can OE and WE both be LOW simultaneously?

Yes, but this places the I/O pins in high-impedance state regardless of CE state. When OE and WE are both LOW, the device ignores address and data bus activity-outputs float and no read or write occurs. This condition is electrically safe and used for bus isolation during multi-master arbitration.

Does CY7C128A-20VC support battery backup operation?

No. The device lacks dedicated V_BACKUP or V_BAT pins and has no guaranteed data retention below 4.5V. While functional down to ~4.0V in some units, Cypress does not specify or guarantee operation or data retention outside the 4.5V–5.5V range per its commercial datasheet limits.