Infineon Technologies CY62128ELL-55SXET

Overview

CY62128ELL-55SXET from Cypress Semiconductor is a 1-Mbit (128 K × 8) CMOS static RAM with 45 ns access time (Industrial/Automotive-A grade), 4.5–5.5 V supply, and ultra-low standby current (1 µA typical). It features dual chip enables (CE1/CE2), automatic power-down on deselect, and TTL-level I/O compatibility-designed for battery-sensitive embedded systems requiring non-volatile data retention during sleep.

For engineers reviewing the CY62128ELL-55SXET datasheet, CY62128ELL-55SXET pinout, CY62128ELL-55SXET application, or CY62128ELL-55SXET equivalent, key selection criteria include industrial temperature support (–40 °C to +85 °C), TSOP-I package compatibility, CE-controlled power-down behavior, and 32-pin address/data multiplexing constraints in memory expansion designs.

Technical Context

The CY62128ELL-55SXET implements a 128K × 8 asynchronous SRAM architecture with independent CE1/CE2 logic enabling hierarchical memory banking. Its automatic power-down activates when CE1 is HIGH or CE2 is LOW, reducing ICCDR to ≤4 µA while maintaining data retention at VCC ≥ 2.0 V.

It supports three read modes (CE-controlled, OE-controlled, and CE/OE-coordinated) and two write modes (WE-controlled with CE active), with guaranteed tAA = 55 ns and tDOE = 25 ns under 100 pF load. Input thresholds meet TTL voltage levels (VIH = 2.2 V min), not CMOS-compatible VIH (≥3.5 V).

Key Specifications

Pinout & Package

Package: 32-pin Thin Small Outline Package (TSOP Type I), 11.8 mm × 10.0 mm × 1.0 mm body, JEDEC MO-153 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS62WV1288BLL-55QLI and CY62128EV30LL-55SXI, the CY62128ELL-55SXET uniquely supports 5 V TTL-level interfacing and industrial temperature operation without voltage translation-making it irreplaceable in legacy embedded upgrades where bus voltage and timing margins are fixed.

Availability

CY62128ELL-55SXET is available at Aetrix Electronics and suitable for industrial PLC data buffering, automotive instrument cluster memory expansion, and portable medical device data logging requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY62128ELL-55SXET 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 microcontroller solutions for industrial, automotive, and IoT applications, with headquarters in San Jose, CA.

The CY62128E MoBL® product line delivers ultra-low-power static RAMs optimized for battery-backed data retention and energy-constrained portable electronics-prioritizing sub-microamp standby current without sacrificing 5 V bus compatibility.

FAQ

Is CY62128ELL-55SXET compatible with 3.3 V microcontrollers?

No. The CY62128ELL-55SXET requires 4.5–5.5 V supply and accepts TTL-level inputs (VIH ≥ 2.2 V), but its outputs do not meet 3.3 V CMOS logic thresholds. Direct interface with 3.3 V MCUs requires bidirectional level-shifting circuitry to avoid overvoltage damage and signal integrity loss.

What is the function of the NC pin (Pin 27) in the TSOP package?

Pin 27 is designated NC (No Connect) and is not bonded to the silicon die. It must remain unconnected on the PCB-neither tied to VCC, VSS, nor routed. Leaving it floating is electrically safe; soldering or routing to any net may cause mechanical stress or unintended coupling in high-density layouts.

Does CY62128ELL-55SXET support battery backup mode with VCC disconnected?

Yes. When VCC drops to ≥2.0 V and CE1 is held HIGH or CE2 LOW, the device enters data retention mode with ICCDR ≤4 µA. External backup voltage must be applied through a diode-OR circuit to VCC; the SRAM retains data for >20 years at 25 °C with proper decoupling and clean hold voltage.

Can CE1 and CE2 be tied together for simplified control?

Yes, but only if driven by an active-LOW signal inverted through a single transistor or gate. CE1 requires active-LOW and CE2 active-HIGH logic; tying them directly causes permanent disable. Recommended practice is to use CE1 as primary enable and pull CE2 HIGH via 10 kΩ resistor for basic operation.