Infineon Technologies CY62158H-45ZSXI

Overview

CY62158H-45ZSXI from Cypress Semiconductor is an 8-Mbit (1M × 8) MoBL® CMOS static RAM with embedded single-bit error-correcting code (ECC), TTL-compatible I/O, 45 ns access time, and ultra-low 5.5 µA typical standby current. It operates across 4.5 V–5.5 V and supports industrial temperature range (–40 °C to +85 °C), deployed in mission-critical memory buffers for industrial controllers and avionics data loggers.

For engineers reviewing the CY62158H-45ZSXI datasheet, CY62158H-45ZSXI pinout, CY62158H-45ZSXI application, or CY62158H-45ZSXI equivalent, key selection criteria include ECC-enabled reliability, dual chip enable (CE1/CE2) control logic, TSOP II package compatibility, and 1.0-V data retention capability under brown-out conditions.

Technical Context

The CY62158H implements a 1M × 8-bit SRAM array with dedicated on-die ECC encoder/decoder circuitry that detects and corrects all single-bit errors per 8-bit word without external logic. Error correction occurs transparently during read cycles; no automatic write-back is performed on correction.

It uses dual active-low/high chip enables (CE1 = LOW, CE2 = HIGH) for device selection, TTL-compatible input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V), and supports three power states: active (ICC ≤ 36 mA), automatic power-down (ISB1 ≤ 16 µA), and data retention (VDR = 1.0 V, ICCDR ≤ 26 µA).

Key Specifications

Pinout & Package

44-pin Thin Small Outline Package (TSOP II), 0.8 mm pitch, body size 10.16 mm × 18.42 mm, JEDEC MO-141AC compliant. Pin 1 index located at top-left corner when notch faces upward.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61WV10248BLL-10MLI and NVTFS16384M8T1G, CY62158H-45ZSXI uniquely delivers hardware-transparent ECC, 45 ns speed, and sub-10 µA standby in a standard TSOP II footprint-enabling certified safety systems without added logic or latency penalties.

Availability

CY62158H-45ZSXI is available at Aetrix Electronics and suitable for industrial PLC data buffers, avionics flight data recorders, and railway signaling interlocking units requiring stable component supply across extended product lifecycles.

Supply support for CY62158H-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 aerospace applications, with focus on functional safety and long-term supply stability.

CY62158H belongs to the MoBL® (Mobile Bit-Low-power) SRAM product line, engineered specifically for systems demanding ultra-low standby power, ECC-enhanced data integrity, and robust operation across harsh environmental conditions.

FAQ

Does CY62158H-45ZSXI perform automatic write-back after ECC correction?

No. The device corrects single-bit errors on-the-fly during read operations but does not automatically rewrite corrected data to the memory array. Write-back must be implemented externally if persistent correction is required. This design avoids unintended writes during read-only diagnostic modes and preserves deterministic timing behavior.

What is the maximum operating junction temperature for CY62158H-45ZSXI in continuous operation?

The maximum junction temperature is 125 °C, derived from the industrial-grade ambient rating (–40 °C to +85 °C) and thermal resistance values (θJA = 66.93 °C/W). At 85 °C ambient and 36 mA ICC, junction temperature remains within specification assuming standard PCB copper pour and airflow conditions.

Can NC pins on CY62158H-45ZSXI be left floating or must they be tied to ground?

NC pins are internally unconnected and may be left floating, grounded, or tied to VCC without affecting operation. Cypress explicitly states they are "not connected internally to the die" and recommends leaving them unconnected unless required for mechanical stability or EMI shielding in specific board layouts.

Is the 1.0-V data retention voltage guaranteed across the full industrial temperature range?

Yes. The 1.0-V minimum VCC for data retention (VDR) is specified across –40 °C to +85 °C per DC Electrical Characteristics table. However, ICCDR increases with temperature (e.g., 16 µA max at 85 °C), so backup power sources must be sized accordingly to sustain retention under worst-case thermal conditions.