Infineon Technologies CY62256NLL-55ZRXE

Overview

CY62256NLL-55ZRXE from Cypress Semiconductor is a 256 Kbit (32K × 8) high-speed CMOS static RAM with 55 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 (82.5 μW max standby), and TTL-compatible signaling - deployed in embedded controllers, industrial PLCs, and legacy instrumentation requiring non-volatile SRAM retention during low-power states.

For engineers reviewing the CY62256NLL-55ZRXE datasheet, CY62256NLL-55ZRXE pinout, CY62256NLL-55ZRXE application, or CY62256NLL-55ZRXE equivalent, key selection criteria include guaranteed 55 ns read cycle time, sub-10 μA CMOS standby current at industrial temp, CE-controlled automatic power-down behavior, and compatibility with 28-pin TSOP-I footprint for space-constrained board layouts.

Technical Context

The CY62256NLL-55ZRXE implements a full CMOS 32K × 8 asynchronous SRAM architecture with independent address decoding (A0–A14), bidirectional data bus (I/O0–I/O7), and three control signals (CE#, OE#, WE#) enabling precise read/write timing and seamless memory expansion. Its automatic power-down mode activates when CE# is HIGH, reducing ICC to ≤0.1 μA under CMOS input conditions.

Timing is defined by overlapping CE# and WE# assertions for writes, and CE#/OE# co-assertion for reads. The device guarantees tRC = 55 ns, tAA = 55 ns, and tHZOE = 25 ns (CL = 5 pF), with output drive strength of ±2.1 mA (IOL/IOH) and input leakage < ±0.5 μA across –40°C to +85°C.

Key Specifications

Pinout & Package

Package: 28-pin Thin Small Outline Package (TSOP-I), 8.1 mm × 13.4 mm body, 0.55 mm pitch, JEDEC MO-153 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS62C256AL-55QLI and AS6C4008-55TIN, the CY62256NLL-55ZRXE uniquely delivers industrial temperature support combined with sub-0.2 μA standby current - making it the sole option for battery-powered field instruments requiring both extended thermal range and multi-year data retention.

Availability

CY62256NLL-55ZRXE is available at Aetrix Electronics and suitable for industrial data loggers, legacy CNC controllers, medical infusion pump UIs, and railway signaling interfaces requiring stable component supply across long production lifecycles.

Supply support for CY62256NLL-55ZRXE 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 solutions for industrial, automotive, and communications markets.

The CY62256N series was developed specifically for legacy system upgrades and long-lifecycle embedded applications requiring pin-identical replacements for aging 5 V SRAMs with guaranteed industrial temperature performance.

FAQ

What is the maximum clock frequency supported by CY62256NLL-55ZRXE?

The CY62256NLL-55ZRXE is an asynchronous SRAM and does not use a clock signal. Its maximum operational speed is defined by access time: 55 ns read cycle time supports bus frequencies up to 18.2 MHz when interfaced with microcontrollers that insert appropriate wait states. No internal clock circuitry exists - timing depends entirely on external CE#, OE#, and WE# signal edges.

Can CY62256NLL-55ZRXE operate at 3.3 V?

No. The CY62256NLL-55ZRXE requires a minimum VCC of 4.5 V and is specified only for 4.5–5.5 V operation. Attempting 3.3 V operation will result in undefined behavior, failed reads/writes, and potential data corruption. For 3.3 V systems, consider Infineon's CY62167EV30 or ISSI IS61WV25616BLL.

Does this SRAM retain data during VCC brownout?

Yes - when VCC drops below 2.0 V while CE# remains HIGH, the device enters data retention mode with ICCDR ≤5 μA (typical) and preserves stored data as long as VCC stays ≥2.0 V. This mode is automatic and requires no external control; however, data is lost if VCC falls below 2.0 V or if CE# is pulled LOW during brownout.

Is the TSOP-I package of CY62256NLL-55ZRXE compatible with reflow soldering per J-STD-020?

Yes. The CY62256NLL-55ZRXE in TSOP-I package is qualified for lead-free reflow per J-STD-020D, with peak temperature tolerance of 260°C for 30 seconds. Recommended profile includes ramp-up ≤3°C/s, preheat 150–200°C for 60–120 s, soak 200–220°C for 60–120 s, and reflow above 237°C for 30–60 s.