Infineon Technologies CY7C1049G18-15ZSXI

Overview

CY7C1049G18-15ZSXI from Cypress Semiconductor is a 4-Mbit (512K × 8) CMOS static RAM with embedded single-bit error-correcting code (ECC), TTL-compatible I/O, and ERR output for real-time error detection/correction. It operates across three voltage ranges (1.65–2.2 V, 2.2–3.6 V, 4.5–5.5 V), delivers 15 ns access time (tAA), and supports industrial temperature (–40 °C to +85 °C). Used in mission-critical embedded controllers requiring data integrity, such as avionics data loggers and medical diagnostic memory buffers.

For engineers reviewing the CY7C1049G18-15ZSXI datasheet, CY7C1049G18-15ZSXI pinout, CY7C1049G18-15ZSXI application, or CY7C1049G18-15ZSXI equivalent, key selection criteria include ECC-enabled single-bit correction capability, multi-voltage support, ERR signal assertion timing, and SOJ-36 package compatibility with legacy SRAM footprints.

Technical Context

This device implements on-die ECC encoding/decoding logic that detects and corrects single-bit errors during read cycles without automatic write-back. The ERR pin asserts HIGH only when a correctable error is found - no action required by host controller beyond monitoring the signal.

It supports dual chip-enable architecture (CE1/CE2) for bank-selectable operation and uses standard asynchronous SRAM control protocol (CE, OE, WE) with TTL-level inputs/outputs. Data retention at 1.0 V enables low-power suspend modes while preserving memory contents.

Key Specifications

Pinout & Package

Package: 36-pin Small Outline J-Lead (SOJ), RoHS-compliant, lead-free. Pin pitch: 1.27 mm. Body width: 10.16 mm. Compatible with JEDEC MS-012AC standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61WV5128BLL-15KLI and 48L256-I/P, CY7C1049G18-15ZSXI uniquely delivers parallel-byte access, multi-voltage support, and autonomous single-bit correction - making it the only option meeting functional safety requirements for real-time embedded memory in avionics and rail signaling.

Availability

CY7C1049G18-15ZSXI is available at Aetrix Electronics and suitable for aerospace data loggers, medical diagnostic imagers, and industrial PLC controllers requiring stable component supply across extended product lifecycles.

Supply support for CY7C1049G18-15ZSXI 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 emphasis on data integrity and long-term supply stability.

CY7C1049G18-15ZSXI belongs to Cypress's legacy high-speed SRAM portfolio targeting systems where deterministic timing, ECC assurance, and multi-voltage interoperability are mandatory - especially in safety-certified embedded platforms.

FAQ

Does CY7C1049G18-15ZSXI support automatic error write-back after correction?

No. The device performs single-bit error correction during read cycles and asserts the ERR pin, but does not automatically rewrite the corrected data back to the memory array. Host firmware must initiate a separate write cycle if persistent correction is required. This behavior is explicitly documented in Note 1 of the datasheet.

What is the maximum operating frequency supported by CY7C1049G18-15ZSXI?

The device does not operate synchronously and has no clock input. Its maximum effective throughput is determined by access time (15 ns) and cycle time (tRC = 20 ns min). At 15 ns tAA, it supports up to 50 MHz burst read/write rates under ideal bus timing conditions with zero wait states.

Can the ERR pin be left unconnected if ECC functionality is not used?

Yes. The ERR pin is an open-drain output and may be left floating if error reporting is unused. However, tying it to VCC via a 10-kΩ pull-up resistor is recommended to prevent noise-induced false assertions during power-up or idle states.

Is CY7C1049G18-15ZSXI pin-compatible with standard 512K×8 SRAMs like CY7C1041V33?

No. While both are 512K×8 SRAMs, CY7C1049G18-15ZSXI adds the ERR pin (pin 21 in 44-pin TSOP II, not present in 36-pin SOJ variant shown in this part number) and uses different pin assignments for A17/A18. Direct replacement requires PCB layout revision and firmware adaptation for ERR handling.