Infineon Technologies CY62126ESL-45ZSXIT

Overview

CY62126ESL-45ZSXIT from Cypress Semiconductor is a 1-Mbit (64 K × 16) CMOS static RAM with 45 ns access time, operating across dual voltage ranges (2.2–3.6 V and 4.5–5.5 V), ultra-low standby current (max 4 µA), and TTL-compatible I/O for embedded microcontroller memory expansion in portable industrial systems.

For engineers reviewing the CY62126ESL-45ZSXIT datasheet, CY62126ESL-45ZSXIT pinout, CY62126ESL-45ZSXIT application, or CY62126ESL-45ZSXIT equivalent, key selection criteria include its byte-wide write enable (BHE/ BLE), automatic CE power-down mode, TSOP II 44-pin package compatibility, and data retention down to 1.5 V for battery-backed operation.

Technical Context

The CY62126ESL-45ZSXIT implements a 64K × 16 asynchronous SRAM array with independent high- and low-byte enables (BHE, BLE), enabling partial-word writes without external logic. Its CMOS architecture supports TTL-level input thresholds and delivers guaranteed 45 ns read cycle time (tRC) at full VCC range.

It features automatic power-down when CE is HIGH and address lines are static, reducing ICC to ≤4 µA (ISB2), and maintains data retention at VCC as low as 1.5 V with ICCDR ≤3 µA. Output drivers support high-impedance tri-state control via OE, CE, BHE, and BLE with defined tHZOE (≤18 ns) and tLZCE (≤10 ns).

Key Specifications

Pinout & Package

44-pin Thin Small Outline Package (TSOP) Type II, 400-mil body width, lead pitch 0.8 mm, compliant with JEDEC MO-141AC. Pin 1 index marked by notch or dot; top view shown in datasheet Figure 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS62WV51216BLL-45NLI and R1LV52256ASBG-45SI, the CY62126ESL-45ZSXIT uniquely supports both 3.3 V and 5 V host interfaces without external translation, retains data down to 1.5 V, and delivers verified 45 ns timing across its full industrial temperature range (–40 °C to +85 °C).

Availability

CY62126ESL-45ZSXIT is available at Aetrix Electronics and suitable for portable data loggers, industrial PLC I/O modules, medical patient monitors, and automotive diagnostic tools requiring stable component supply across extended temperature and dual-voltage operation.

Supply support for CY62126ESL-45ZSXIT 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 IoT applications with emphasis on low-power integration and long-term supply stability.

The MoBL® (More Battery Life™) SRAM product line targets portable and energy-constrained systems requiring fast, reliable, and ultra-low-quiescent memory with robust data retention and wide supply flexibility.

FAQ

Is CY62126ESL-45ZSXIT compatible with 5 V microcontrollers?

Yes - it supports 4.5–5.5 V VCC operation and features TTL-compatible input thresholds (VIH = 2.2 V min at 5 V), allowing direct interface with legacy 5 V MCUs without level shifters. Output VOH reaches 3.4 V minimum at 5 V, meeting standard TTL high-level requirements.

What happens to data during power loss?

Data is retained as long as VCC remains ≥1.5 V and CE is held HIGH; ICCDR is guaranteed ≤3 µA under those conditions. Below 1.5 V, data is not assured. The device does not include internal non-volatility - external backup capacitors or batteries are required for true zero-power retention.

Can I use only the low byte (I/O0–I/O7) without connecting I/O8–I/O15?

Yes - unused I/O pins may be left unconnected or tied to VSS/VCC per board layout constraints. When BHE is HIGH, the high byte is disabled and presents high impedance; no pull-up/down is required unless specified by system noise immunity needs.

Does this SRAM require initialization before first use?

No - it is a fully static device with no initialization sequence, configuration registers, or boot dependencies. Memory contents are undefined at power-up; firmware must perform a write initialization if deterministic startup state is required.