Infineon Technologies CY7C025E-25AXCT

Overview

CY7C025E-25AXCT from Infineon (formerly Cypress) is a 64K × 16-bit asynchronous CMOS static RAM (SRAM) with 25 ns access time, 3.3 V supply voltage, and industrial temperature range (–40°C to +85°C). It features three-state outputs, byte-wide write control (UB/LB), and TTL-compatible inputs for embedded microcontroller data memory or FIFO buffering in industrial controllers.

For engineers reviewing the CY7C025E-25AXCT datasheet, CY7C025E-25AXCT pinout, CY7C025E-25AXCT application, or CY7C025E-25AXCT equivalent, key selection criteria include access time consistency under varying V_CC, low active power (120 mW typical), write cycle reliability, and compatibility with legacy 16-bit bus architectures requiring non-multiplexed address/data interfaces.

Technical Context

This SRAM implements a full parallel interface with separate 16-bit data bus (DQ0–DQ15), 16-bit address bus (A0–A15), and independent chip enable (CE), output enable (OE), and write enable (WE) controls. Byte write capability is enabled via UB (Upper Byte) and LB (Lower Byte) signals, allowing selective 8-bit writes without read-modify-write cycles.

It operates in standard asynchronous mode with no clock input required; timing is governed by setup/hold windows relative to CE/OE/WE edges. The device uses NMOS-compatible output drivers and includes power-down mode (CE high) reducing standby current to 1 µA max, supporting low-power system states in programmable logic controllers and test equipment.

Key Specifications

Pinout & Package

Package: 44-pin TSOP-II (Thin Small Outline Package, Type II), 400 mil width, JEDEC MO-141AC compliant, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar asynchronous SRAM applications.

Compared with IS61LV51216AL-25MLI and AS6C4008-25ZIN, CY7C025E-25AXCT offers tighter V_CC tolerance (±0.3 V vs. ±0.5 V), guaranteed 25 ns timing across full voltage/temperature range, and native 3.3 V I/O compatibility-reducing design validation effort in legacy 16-bit bus systems.

Availability

CY7C025E-25AXCT is available at Aetrix Electronics and suitable for industrial PLC data buffers, automotive ECU parameter storage, and test equipment FIFO memory requiring stable component supply and long-lifecycle support.

Supply support for CY7C025E-25AXCT 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

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive ICs, and memory solutions, with global manufacturing and quality certification to ISO/TS 16949 and AEC-Q200.

CY7C025E-25AXCT belongs to Infineon's legacy Cypress SRAM product line, designed specifically for industrial and automotive systems needing reliable, pin-compatible replacements for aging 16-bit parallel SRAMs in mission-critical control hardware.

FAQ

Is CY7C025E-25AXCT compatible with 5 V logic interfaces?

No. CY7C025E-25AXCT is a 3.3 V-only device with absolute maximum input voltage of 4.6 V. Driving inputs with 5 V logic violates the datasheet specification and risks latch-up or permanent damage. Interface to 5 V systems requires level-shifting circuitry or voltage translation ICs.

Does this SRAM support battery backup operation?

Yes-CY7C025E-25AXCT maintains data integrity during V_CC brownout when backed by a 3.0–3.6 V battery or supercapacitor. Its 1 µA standby current enables multi-day retention on small backup sources, provided V_CC remains ≥2.0 V per datasheet minimum retention voltage.

What is the maximum clock frequency supported for read/write cycles?

This is an asynchronous SRAM with no internal clock. Maximum effective throughput depends on external controller timing: with 25 ns access and 25 ns cycle times, it supports up to 40 million operations per second (40 MHz) in ideal bus conditions, assuming zero bus turnaround and proper setup/hold margins.

Can UB and LB be asserted simultaneously for full 16-bit writes?

Yes. Asserting both UB and LB low enables full 16-bit write operation identical to asserting WE alone. This configuration is electrically identical to standard write mode and is explicitly supported in the datasheet timing diagrams and functional description.