Cypress Semiconductor Corp CY62128ELL-45ZAXIT

Overview

CY62128ELL-45ZAXIT from Cypress Semiconductor is a 1-Mbit (128 K × 8) CMOS static RAM with 45 ns access time, 4.5–5.5 V supply range, and industrial temperature rating (–40 °C to +85 °C). It features dual chip enables (CE1/CE2), automatic power-down, and TTL-compatible I/O for microcontroller and embedded memory expansion in portable and industrial systems.

For engineers reviewing the CY62128ELL-45ZAXIT datasheet, CY62128ELL-45ZAXIT pinout, CY62128ELL-45ZAXIT application, or CY62128ELL-45ZAXIT equivalent, key selection criteria include standby current (≤4 µA), active current (1.3 mA at 1 MHz), CE-controlled power-down behavior, and 32-pin STSOP package compatibility with legacy SRAM designs.

Technical Context

The CY62128ELL-45ZAXIT implements a 128K × 8 asynchronous SRAM architecture with complementary metal oxide semiconductor (CMOS) process technology. Its dual chip enable logic (CE1 LOW + CE2 HIGH for active mode) enables seamless memory banking and hierarchical address decoding in multi-chip systems.

It supports three distinct operational states: active read/write (CE1=LOW, CE2=HIGH, WE=HIGH/OE=LOW), active write (CE1=LOW, CE2=HIGH, WE=LOW), and automatic power-down (CE1=HIGH or CE2=LOW), reducing ICCDR to ≤4 µA. Output drivers meet TTL voltage thresholds (VOH ≥2.4 V at IOH = –1 mA), confirming compatibility with 5 V microcontrollers.

Key Specifications

Pinout & Package

Package: 32-pin STSOP (Shrink Thin Small Outline Package), RoHS-compliant, 0.4 mm pitch, body size 10.16 mm × 5.2 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 128K×8 SRAM applications.

Compared with IS61LV12816AL-10TLI and CY62128EV30LL-45ZAXIT, the CY62128ELL-45ZAXIT uniquely balances 5 V TTL compatibility, industrial temperature operation, and ultra-low 4 µA standby-making it optimal for cost-sensitive, battery-aware 8-bit embedded systems where pin and voltage compatibility are non-negotiable.

Availability

CY62128ELL-45ZAXIT is available at Aetrix Electronics and suitable for industrial PLC data buffering, portable medical monitor memory, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY62128ELL-45ZAXIT 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 memory, PSoC, and USB solutions for embedded systems.

The CY62128E MoBL® product line was designed specifically for battery-constrained portable electronics, delivering ultra-low standby current without sacrificing 5 V TTL interface compatibility or industrial reliability.

FAQ

Is CY62128ELL-45ZAXIT compatible with 3.3 V microcontrollers?

No. This device requires 4.5–5.5 V supply and uses TTL-level I/O thresholds (VIH ≥2.2 V, VIL ≤0.8 V), not CMOS 3.3 V logic levels. Interfacing with 3.3 V processors requires level-shifting circuitry or selection of a 3.3 V SRAM variant like CY62128EV30LL-45ZAXIT with appropriate voltage translation.

What is the function of CE1 and CE2 pins together?

CE1 and CE2 implement a two-signal chip select: the device activates only when CE1 is LOW and CE2 is HIGH. This dual-enable scheme enables hierarchical memory decoding-e.g., using CE2 as a bank select and CE1 as a page select-eliminating external AND gates in multi-SRAM systems.

Does CY62128ELL-45ZAXIT support data retention below VCC = 4.5 V?

Yes. It guarantees data retention down to VDR = 2.0 V with ICCDR ≤4 µA, provided CE1 is HIGH or CE2 is LOW. This allows graceful low-power suspend modes in battery-backed systems where main supply drops but backup rail maintains memory state.

Can OE be held LOW while WE is toggled for read-modify-write operations?

No. When WE is LOW, the device enters write mode and forces I/O pins into input mode regardless of OE state. OE only controls output driver enable during read cycles (WE HIGH). For read-modify-write, the sequence must be: read (CE1/CE2 active, OE LOW, WE HIGH), process data externally, then write (CE1/CE2 active, WE LOW, OE HIGH or LOW).