Infineon Technologies CY62256NL-70SNXCT

Overview

CY62256NL-70SNXCT from Cypress Semiconductor is a 256K-bit (32K × 8) CMOS static RAM with 70 ns access time, 4.5–5.5 V operation, and industrial temperature range (–40°C to +85°C). It features active-low CE/OE/WE controls, tristate I/Os, automatic power-down (≤0.1 µA standby), and TTL-compatible signaling. Used in legacy industrial controllers, instrumentation buffers, and FPGA configuration memory where non-volatility isn't required but fast, deterministic read/write timing is critical.

For engineers reviewing the CY62256NL-70SNXCT datasheet, CY62256NL-70SNXCT pinout, CY62256NL-70SNXCT application, or CY62256NL-70SNXCT equivalent, this page delivers verified package mapping (28-pin SOIC, 300-mil), confirmed pin functions (A0–A14, I/O0–I/O7, CE/OE/WE/GND/VCC), real-world power metrics (25 mA active, 0.1 µA CMOS standby), and direct alternatives for memory expansion in embedded systems with strict timing and thermal constraints.

Technical Context

The CY62256NL-70SNXCT implements a fully static 32K × 8 memory array with asynchronous parallel interface logic. Its dual-level chip enable (CE) and output enable (OE) allow seamless bank expansion without external glue logic, while WE-controlled write cycles support both CE- and OE-gated read/write modes per JEDEC-standard SRAM timing diagrams.

It uses CMOS process technology to achieve 70 ns tRC with 25 mA typical ICC at 5 V and 25°C, and achieves ultra-low ISB2 ≤ 0.1 µA under CMOS-compatible deselection conditions (CE > VCC − 0.3 V, VIN outside valid logic range), enabling battery-backed retention in low-power hold states.

Key Specifications

Pinout & Package

28-pin narrow SOIC (300-mil) package with gull-wing leads, JEDEC MS-012AC compliant, 1.27 mm pitch, body width 7.5 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS62C256AL-70QLI and R1LV256A-70PZ, the CY62256NL-70SNXCT offers the lowest standby current (0.1 µA) and tightest industrial thermal spec (–40°C to +85°C), making it optimal for cost-sensitive, long-life industrial equipment where power budget and qualification scope are strictly defined.

Availability

CY62256NL-70SNXCT is available at Aetrix Electronics and suitable for industrial PLCs, medical instrumentation data loggers, and legacy avionics display subsystems requiring stable component supply across extended product lifecycles.

Supply support for CY62256NL-70SNXCT 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 system-on-chip solutions for industrial, automotive, and consumer markets.

The CY62256N series was designed specifically for high-reliability, pin-compatible replacement of aging 28-pin SRAMs in mission-critical embedded systems requiring predictable timing, low power, and long-term obsolescence mitigation.

FAQ

Is CY62256NL-70SNXCT functionally identical to CY62256N-70SN?

Yes. The "L" suffix denotes the low-power LL version with reduced ISB2 (0.1 µA vs. 2 µA in standard N-grade), while "-70" specifies 70 ns access time and "SN" indicates 28-pin narrow SOIC packaging. All timing, pinout, and logic behavior match the base CY62256N-70SN, with improved standby efficiency.

Can CY62256NL-70SNXCT operate reliably at 4.5 V with full 70 ns timing?

Yes. Electrical characteristics tables confirm tAA ≤ 70 ns and VOH ≥ 2.4 V at VCC = 4.5 V, TA = –40°C to +85°C, and IOL = 2.1 mA. The device maintains full specification compliance across its entire 4.5–5.5 V range without derating.

What is the maximum clock frequency supported for burst reads?

This is an asynchronous SRAM with no internal clock. Maximum effective throughput is determined by tRC = 70 ns, yielding up to 14.3 million 8-bit words per second in continuous read mode with CE and OE held active. No external clock signal is required or used.

Does CY62256NL-70SNXCT require external pull-up resistors on I/O lines?

No. The I/O pins are internally terminated and fully compliant with TTL/CMOS logic levels. Pull-ups are unnecessary unless implementing wired-OR bus arbitration (not typical for this SRAM's point-to-point use case). Standard 5 V logic drivers drive I/O0–I/O7 directly.