Infineon Technologies CY62158ELL-45ZSXI

Overview

CY62158ELL-45ZSXI from Infineon Technologies (formerly Cypress) is a 8-Mbit (1 M × 8) CMOS static RAM with 45 ns access time, 4.5 V–5.5 V supply range, and ultra-low standby current (2 μA typical). It features dual chip enables (CE1/CE2), automatic power-down on deselect, and TTL-level compatibility for embedded memory interfacing in portable industrial controllers.

For engineers reviewing the CY62158ELL-45ZSXI datasheet, CY62158ELL-45ZSXI pinout, CY62158ELL-45ZSXI application, or CY62158ELL-45ZSXI equivalent, key selection criteria include 44-pin TSOP II footprint, 1.8 mA active current at 1 MHz, CE-controlled low-power mode, and compatibility with legacy 5 V microcontrollers requiring ≥2.4 V VOH.

Technical Context

This SRAM implements a 1024K × 8 asynchronous architecture with independent address/data bus timing. Its dual CE logic (CE1 LOW + CE2 HIGH for enable) enables seamless memory expansion in multi-bank systems without external decoding logic.

The device uses CMOS circuitry to achieve simultaneous low-speed robustness and high-speed performance: 45 ns tRC supports 22.2 MHz burst reads, while automatic CE-driven power-down reduces ISB2 to 8 μA max-critical for battery-backed data retention in industrial logging applications.

Key Specifications

Pinout & Package

Supplied in a Pb-free 44-pin TSOP II package with 0.8 mm pitch and standard JEDEC MO-141AC footprint. Pin 1 marked by notch; top-view orientation per Figure 1 in datasheet Rev. *L.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61LV10248AL-10TLI and AS6C4008-55TIN, CY62158ELL-45ZSXI uniquely balances 5 V TTL compatibility, 45 ns speed, and sub-8 μA standby in a drop-in 44-pin TSOP II package-making it optimal for industrial retrofits and battery-constrained 5 V systems.

Availability

CY62158ELL-45ZSXI is available at Aetrix Electronics and suitable for industrial data loggers, legacy MCU memory expansion, medical handhelds, and programmable logic controller I/O caches requiring stable component supply and long-term lifecycle support.

Supply support for CY62158ELL-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

Infineon Technologies is a global semiconductor leader headquartered in Munich, Germany, delivering power, sensor, and connectivity solutions for automotive, industrial, and IoT markets.

CY62158E belongs to Infineon's MoBL® (More Battery Life™) SRAM product line, engineered specifically for ultra-low-power, high-reliability memory in portable and battery-operated industrial equipment.

FAQ

Is CY62158ELL-45ZSXI compatible with 3.3 V microcontrollers?

No. This device requires 4.5–5.5 V supply and is specified for TTL-level inputs (VIH ≥2.2 V). Interfacing with 3.3 V MCUs requires level-shifting circuitry on all address, data, and control lines to avoid violating absolute maximum ratings and ensure reliable operation.

What happens if CE1 and CE2 are both asserted simultaneously?

When CE1 is LOW and CE2 is HIGH, the device is enabled for read/write. If CE1 is LOW and CE2 is also LOW, the device enters high-impedance state regardless of OE or WE state-effectively disabling all I/O. This condition is electrically safe but halts memory access until CE2 returns HIGH.

Does CY62158ELL-45ZSXI support battery backup operation?

Yes. With VCC reduced to ≥2.0 V (VDR), the device retains data while drawing ≤8 μA (ICCDR). External circuitry must hold CE1 HIGH and CE2 LOW during backup mode, and ensure address/data lines remain stable to prevent spurious writes.

Can unused NC pins be tied to VCC or GND?

No. NC pins are not connected internally and must remain unconnected-neither tied to VCC nor GND. Connecting them risks parasitic coupling or unintended current paths. Per datasheet Rev. *L, NC pins may be left floating or grounded only if explicitly permitted in layout guidelines (not stated for this part).