Infineon Technologies CY62256VNLL-70SNXE

Overview

CY62256VNLL-70SNXE from Cypress Semiconductor is a 256 Kbit (32K × 8) low-voltage CMOS static RAM with 70 ns access time, operating across 2.7V–3.6V supply and supporting commercial (0°C to 70°C) temperature range. It features active-low CE/OE/WE controls, tristate I/Os, automatic power-down (<5 µA standby), and TTL-compatible signaling - deployed in embedded controllers, industrial PLCs, and legacy instrumentation requiring nonvolatile SRAM backup.

For engineers reviewing the CY62256VNLL-70SNXE datasheet, CY62256VNLL-70SNXE pinout, CY62256VNLL-70SNXE application, or CY62256VNLL-70SNXE equivalent, key selection criteria include 70 ns read cycle time, 28-pin narrow SOIC package compatibility, CE-controlled power-down behavior, and 32K × 8 memory organization for byte-wide microcontroller interfacing.

Technical Context

This SRAM implements a synchronous, address-decoded 32K × 8 array with independent row/column decoding, sense amplifiers, and input buffers. Its control logic uses CE as primary chip select, OE to enable output drivers, and WE to gate write operations - all active-low with defined setup/hold timing relative to address and data transitions.

Power management relies on automatic CE-driven power-down mode, reducing ICC to ≤5 µA when CE is high and inputs are at valid logic levels. The device maintains data retention down to VCC = 1.4 V, with tCDR = 0 ns and ICCDR ≤3 µA under retention conditions.

Key Specifications

Pinout & Package

Package: 28-pin narrow SOIC (300-mil), JEDEC MS-012AC compliant, lead-free (Pb-free) variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS62WV2568BLL-70NLI, CY62256VNLL-70SNXE offers lower standby current (5 µA vs. 10 µA) and commercial-grade cost optimization, while the MC68HC11F1M12 represents a functional shift away from discrete memory toward integrated control - limiting interchangeability to architectural overhauls.

Availability

CY62256VNLL-70SNXE is available at Aetrix Electronics and suitable for industrial HMI panels, medical diagnostic equipment, and legacy PLC modules requiring stable component supply, long-lifecycle support, and Pb-free compliance.

Supply support for CY62256VNLL-70SNXE 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) designs high-reliability memory and mixed-signal ICs for industrial, automotive, and computing applications, with emphasis on low-power, robust timing, and long-term manufacturability.

CY62256VN belongs to Cypress's legacy parallel SRAM product line, engineered specifically for drop-in replacement of aging NMOS and bipolar SRAMs in 8-bit and 16-bit microcontroller systems requiring pin-and-function compatibility.

FAQ

Is CY62256VNLL-70SNXE compatible with 5 V logic systems?

No - it operates strictly within 2.7 V to 3.6 V and is not 5 V tolerant. Inputs exceed VCC + 0.3 V risk damage; interfacing with 5 V microcontrollers requires level-shifting circuitry or I/O buffers rated for 3.3 V operation.

What happens to data when VCC drops below 2.7 V but remains above 1.4 V?

Data is retained as long as VCC stays ≥1.4 V and CE is held high. The device enters data retention mode with ICCDR ≤3 µA (commercial grade), preserving contents without external refresh - confirmed per datasheet page 4, "Data Retention Characteristics".

Can OE and WE both be asserted LOW simultaneously during a read operation?

Yes - OE LOW enables outputs, while WE HIGH (not LOW) is required for read. Asserting WE LOW while OE is LOW initiates a write, not a read. Correct read timing requires CE and OE LOW, WE HIGH, with address stable before CE activation.

Does the 28-pin narrow SOIC package support reflow soldering per J-STD-020?

Yes - the Pb-free variant (denoted by 'N' suffix in SNXE) complies with JEDEC J-STD-020D moisture sensitivity level 3 and peak reflow temperature of 260°C, as verified in Cypress's packaging documentation for CY62256VN family.