Infineon Technologies CY62128ELL-45ZXAT

Overview

CY62128ELL-45ZXAT from Cypress Semiconductor is a 1-Mbit (128 K × 8) CMOS static RAM with 45 ns access time, 4.5–5.5 V supply voltage, and industrial temperature range (–40 °C to +85 °C). It features dual chip enables (CE1/CE2), ultra-low standby current (1 µA typical), and automatic power-down when deselected - designed for battery-powered portable systems requiring reliable non-volatile data retention during sleep.

For engineers reviewing the CY62128ELL-45ZXAT datasheet, CY62128ELL-45ZXAT pinout, CY62128ELL-45ZXAT application, or CY62128ELL-45ZXAT equivalent, key selection criteria include TTL-compatible I/O levels, STSOP-32 package footprint, CE-controlled low-power entry, 16-bit address bus (A0–A16), and compatibility with legacy 8-bit microcontrollers in embedded instrumentation and industrial control modules.

Technical Context

The CY62128ELL-45ZXAT implements a fully static 128K × 8 memory array using CMOS process technology, supporting asynchronous read/write operations without clocks or refresh cycles. Its dual CE architecture (CE1 active-low, CE2 active-low) enables hierarchical memory mapping and seamless expansion across multiple devices.

It uses complementary metal oxide semiconductor (CMOS) logic for optimal speed–power trade-off, with guaranteed 45 ns tAA and tACE timing at VCC = 4.5–5.5 V and TA = –40 °C to +85 °C. Output enable (OE) and write enable (WE) are fully independent, allowing three-state control of I/O pins during read, write, or high-impedance hold states.

Key Specifications

Pinout & Package

Package: 32-pin STSOP (Shrink Thin Small Outline Package), 8.0 mm × 13.4 mm body, 0.5 mm lead pitch, RoHS-compliant, Pb-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS62WV1288BLL-45NLI and MCM62128ELP-45, the CY62128ELL-45ZXAT uniquely delivers TTL compatibility, dual CE flexibility, and industrial temperature support in a single STSOP-32 package - making it the only choice for retrofitting legacy 5 V controller designs with extended environmental requirements.

Availability

CY62128ELL-45ZXAT is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, and automotive body control units requiring stable component supply across long production lifecycles.

Supply support for CY62128ELL-45ZXAT 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 fabless semiconductor company specializing in embedded systems solutions, including PSoC, NOR/NAND flash, and low-power SRAMs for industrial and automotive markets.

The MoBL® (More Battery Life™) SRAM product line was engineered specifically for ultra-low-power portable electronics, emphasizing sub-microamp standby current, fast wake-up latency, and TTL-level interoperability without external level translation.

FAQ

Is CY62128ELL-45ZXAT compatible with 3.3 V microcontrollers?

No. The CY62128ELL-45ZXAT requires 4.5–5.5 V supply and is specified for TTL input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V). Direct connection to 3.3 V logic violates VIH minimum and risks unreliable reads. Use level translators such as TXB0108 or discrete MOSFET buffers for safe interfacing.

What is the function of the NC pin (Pin 26) in the STSOP package?

Pin 26 is a no-connect terminal - physically unconnected to the silicon die. Per Cypress layout guidelines, it may be left floating or tied to GND to improve mechanical stability and reduce noise coupling. It must never be connected to VCC or driven by external signals.

Does CY62128ELL-45ZXAT support true simultaneous read/write operations?

No. It is an asynchronous static RAM with single-port architecture: read and write operations are mutually exclusive. During a write (CE1 LOW, CE2 HIGH, WE LOW), I/O pins are inputs; during a read (CE1 LOW, CE2 HIGH, OE LOW, WE HIGH), they become outputs. Bus contention is prevented by strict timing control of CE, OE, and WE.

How does automatic power-down behave when CE1 and CE2 are driven by different logic sources?

Power-down activates whenever CE1 is HIGH OR CE2 is LOW - the internal CE logic is CE = CE1 AND CE2. If CE1 and CE2 originate from separate decoders, ensure their timing skew does not cause momentary invalid CE states (e.g., CE1 HIGH while CE2 HIGH), which would unintentionally disable the device mid-access.