Infineon Technologies CY62256LL-70PXC

Overview

CY62256LL-70PXC 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 TTL-compatible I/O, automatic CE-controlled power-down (28 µW max standby), and three-state bidirectional data bus (I/O0–I/O7) for memory expansion in embedded controllers and instrumentation systems.

For engineers reviewing the CY62256LL-70PXC datasheet, CY62256LL-70PXC pinout, CY62256LL-70PXC application, or CY62256LL-70PXC equivalent, key selection criteria include verified 70 ns read cycle time, low 28 µW standby current at industrial temperature, CE/OE/WE control logic compatibility, and narrow SOIC-28 package footprint for space-constrained PCB layouts.

Technical Context

The CY62256LL-70PXC implements a full CMOS 32K × 8 SRAM array with independent address decoding (A0–A14), three-state I/O drivers, and dual active-low control architecture (CE and OE). Its automatic power-down mode activates when CE is HIGH, reducing ICC to ≤28 µW without external circuitry.

Timing is defined by overlapping CE/WE assertions for write cycles and CE/OE coordination for reads; tRC = 70 ns, tACE = 70 ns, and tHZOE = 25 ns ensure deterministic bus interfacing with microcontrollers and FPGAs operating at ≤14 MHz sustained clock rates.

Key Specifications

Pinout & Package

Package: 28-pin narrow SOIC (450-mil body width, JEDEC MS-012AC), RoHS-compliant lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS62C256AL-70QLI and AS6C4008-70SCN, the CY62256LL-70PXC delivers guaranteed industrial temperature operation and lowest standby power (28 µW), making it optimal for thermally constrained, long-duration embedded systems where power budget and environmental robustness are primary constraints.

Availability

CY62256LL-70PXC is available at Aetrix Electronics and suitable for industrial PLC memory buffers, medical instrument data logging, and automotive body control modules requiring stable component supply across extended product lifecycles.

Supply support for CY62256LL-70PXC 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 programmable logic solutions for industrial, automotive, and communications markets.

The CY62256 family targets cost-effective, low-power SRAM replacement in legacy 5 V systems-emphasizing pin compatibility, industrial temperature resilience, and minimal board redesign effort.

FAQ

Is CY62256LL-70PXC compatible with 5 V TTL microcontrollers without level shifting?

Yes. All inputs (A0–A14, CE, OE, WE) accept TTL voltage thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V), and outputs (I/O0–I/O7) drive TTL loads (VOH ≥ 2.4 V at –1.0 mA, VOL ≤ 0.4 V at 2.1 mA) directly. No external level shifters are needed for standard 5 V MCU interfaces like the 8051 or PIC18F series.

What is the minimum VCC required to retain data during power-down?

Data retention is guaranteed down to VCC = 2.0 V, with ICCDR ≤ 5 µA (typ.) at 3.0 V. At 2.0 V, retention current remains below 50 µA (max.), enabling use with supercapacitor hold-up circuits that decay slowly below 5 V.

Does CY62256LL-70PXC support asynchronous burst reads?

No. The device lacks burst addressing or sequential access modes. Each read requires full address setup (tAA = 70 ns) and CE/OE assertion; it operates strictly in random-access mode with no internal address incrementing logic.

Can CE and OE be tied together for simplified control?

Yes, but with functional trade-offs: tying CE and OE enables basic read-only operation with WE controlling R/W, yet disables independent output gating and prevents true three-state bus sharing. For full functionality-including write cycles and bus arbitration-separate CE and OE control is required.