Infineon Technologies CY7C1049G-10VXI

Overview

CY7C1049G-10VXI from Cypress Semiconductor is a 4-Mbit (512K × 8) CMOS static RAM with embedded single-bit error-correcting code (ECC), TTL-compatible I/O, 10 ns access time (tAA), and industrial-grade operation from –40 °C to +85 °C. It supports triple voltage ranges (1.65–2.2 V, 2.2–3.6 V, 4.5–5.5 V), delivers 38 mA typical active current, and features an ERR pin for real-time ECC event indication-used in mission-critical memory subsystems of avionics data recorders and industrial PLC controllers.

For engineers reviewing the CY7C1049G-10VXI datasheet, CY7C1049G-10VXI pinout, CY7C1049G-10VXI application, or CY7C1049G-10VXI equivalent, key selection criteria include verified ECC correction capability, multi-voltage compatibility, 36-pin SOJ package footprint, and industrial temperature support without external error-handling logic.

Technical Context

The device implements on-die ECC encoding/decoding logic that detects and corrects single-bit errors during read cycles without automatic write-back. Its dual-chip-enable architecture allows flexible memory banking, and the ERR output asserts HIGH only when a correctable error is found-enabling system-level logging or fault-aware firmware handling.

It operates across three distinct VCC ranges with guaranteed timing at each: 10 ns tAA at 2.2–3.6 V and 4.5–5.5 V, and 15 ns at 1.65–2.2 V. Data retention is supported down to 1.0 V, with ISB2 standby current specified at 6 mA typical under CMOS input conditions.

Key Specifications

Pinout & Package

Package: 36-pin Small Outline J-Lead (SOJ), RoHS-compliant, industrial temperature grade (–40 °C to +85 °C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61WV5128BLL-10MLI and MT45W8MW16BGX-10IT:D, CY7C1049G-10VXI uniquely delivers pin-compatible ECC correction, zero-software-overhead error reporting, and direct TTL bus compatibility-making it irreplaceable in retrofitting safety-critical legacy systems.

Availability

CY7C1049G-10VXI is available at Aetrix Electronics and suitable for avionics data recorders, industrial PLC controllers, and railway signaling systems requiring stable component supply, long-term lifecycle support, and guaranteed ECC functionality.

Supply support for CY7C1049G-10VXI 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) is a global leader in high-reliability memory and programmable solutions, founded in 1982 and headquartered in San Jose, California.

CY7C1049G belongs to Cypress's industrial-grade parallel SRAM portfolio, designed specifically for applications demanding deterministic timing, radiation-tolerant data integrity, and seamless integration into legacy 8-bit/16-bit microcontroller ecosystems.

FAQ

Does CY7C1049G-10VXI support automatic error correction write-back?

No. The device performs single-bit error correction during read cycles and asserts the ERR pin, but does not automatically rewrite corrected data to the memory array. Write-back must be handled by external logic or firmware if persistent correction is required. This behavior is explicitly documented in Note 1 of the datasheet (Rev. *F, p. 1).

What is the maximum operating frequency supported by CY7C1049G-10VXI?

The device does not specify a maximum clock frequency because it is an asynchronous SRAM. Its 10 ns access time (tAA) supports reliable operation with bus cycles up to 100 MHz when interfaced with controllers having compatible setup/hold timing. AC switching characteristics confirm valid data window alignment at this rate under industrial temperature and voltage conditions.

Can the ERR pin be left unconnected if ECC reporting is not needed?

No. The ERR pin is an open-drain output and must be externally pulled up to VCC via a 4.7 kΩ resistor to ensure proper logic levels and avoid floating-state contention. Leaving it unconnected may cause indeterminate voltage levels, leading to false error assertions or bus contention in multi-device systems.

Is CY7C1049G-10VXI compatible with 5 V-only systems?

Yes. The device supports 4.5–5.5 V operation with guaranteed 10 ns tAA, TTL-compatible inputs, and VOH/VOL levels meeting 5 V logic thresholds. It drives outputs to ≥2.4 V (VOH) and ≤0.4 V (VOL) under full load, ensuring robust interoperability with standard 5 V microcontrollers and peripheral ICs.