Infineon Technologies CY62157ESL-45ZSXI

Overview

CY62157ESL-45ZSXI from Cypress Semiconductor is a 8-Mbit (512K × 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 (2 µA typical), and TTL-compatible I/O levels - used as main data buffer in portable industrial controllers requiring battery longevity and fast random-access storage.

For engineers reviewing the CY62157ESL-45ZSXI datasheet, CY62157ESL-45ZSXI pinout, CY62157ESL-45ZSXI application, or CY62157ESL-45ZSXI equivalent, key selection criteria include byte-enable-controlled 16-bit wide memory access, automatic CE-driven power-down behavior, ISB2 ≤ 8 µA at VCC(max), and TSOP II package compatibility with legacy 5 V and modern low-voltage microcontroller buses.

Technical Context

The CY62157ESL-45ZSXI implements a fully decoded 512K × 16 asynchronous SRAM array with independent Byte High Enable (BHE) and Byte Low Enable (BLE) inputs, enabling selective 8-bit writes to upper or lower data bytes without read-modify-write cycles. Its CMOS architecture supports TTL-level input thresholds and guarantees tRC = 45 ns across full industrial temperature range (–40 °C to +85 °C).

Power management relies on dual-mode automatic power down: ISB1/ISB2 ≤ 8 µA when CE is HIGH (or both BHE and BLE are HIGH), with no external control required. Data retention remains valid down to VDR = 1.5 V, supporting low-power hibernation modes in battery-backed systems.

Key Specifications

Pinout & Package

Package: 44-pin Thin Small Outline Package (TSOP II), Pb-free, 0.8 mm pitch, body size 12.0 × 18.4 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-Mbit asynchronous SRAM applications.

Compared with IS62WV51216BLL-45NLI and R1LV52564AS-45SI#U0, the CY62157ESL-45ZSXI uniquely supports dual-voltage operation without external regulators, retains TTL compatibility for backward integration, and delivers lowest standby current in 5 V mode - making it optimal for migration paths from legacy industrial platforms.

Availability

CY62157ESL-45ZSXI is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC data buffers, and smart meter communication modules requiring stable component supply across extended temperature and dual-voltage operation.

Supply support for CY62157ESL-45ZSXI 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 innovation and long-term supply assurance.

The CY62157ESL belongs to the MoBL® (More Battery Life) SRAM product line, engineered specifically for portable and energy-constrained systems where nanosecond-speed access must coexist with microamp-level standby consumption.

FAQ

Is CY62157ESL-45ZSXI compatible with 5 V microcontrollers?

Yes - it features TTL-compatible input thresholds (VIH = 2.2 V min at 3.3 V VCC; VIH = 2.4 V min at 5 V VCC) and operates across 4.5–5.5 V, enabling direct connection to legacy 5 V MCUs like the 8051, PIC18F, or older ARM7 derivatives without level shifters.

What happens to I/O pins during chip deselect?

When CE is HIGH (or both BHE and BLE are HIGH), all I/O0–I/O15 pins enter high-impedance state regardless of OE or WE status. This prevents bus contention in multi-SRAM systems and eliminates need for external tri-state logic.

Can CY62157ESL-45ZSXI operate at 4.0 V?

No - datasheet explicitly states specifications are not guaranteed for VCC between 3.6 V and 4.5 V. Operation in that range may yield unpredictable timing or increased leakage; design must use either 2.2–3.6 V or 4.5–5.5 V rails exclusively.

Does this SRAM support true 16-bit parallel access?

Yes - the 512K × 16 organization provides native 16-bit wide data bus access. With BHE and BLE both LOW, I/O0–I/O15 transfer full 16-bit words simultaneously; with either enabled alone, it performs true 8-bit byte writes without affecting the opposite byte.