Infineon Technologies CY7C1049B-15VXC

Overview

CY7C1049B-15VXC from Cypress Semiconductor is a 512K × 8 (4-Mbit) high-speed CMOS static RAM with 15 ns access time, TTL-compatible I/O, automatic CE-controlled power-down, and 2.0V data retention capability. It operates at 4.5–5.5V, draws ≤220 mA active current, and is packaged in a Pb-free 36-pin SOJ (400-mil) with center VCC/GND pinout - used in industrial control memory buffers and legacy telecom line cards.

For engineers reviewing the CY7C1049B-15VXC datasheet, CY7C1049B-15VXC pinout, CY7C1049B-15VXC application, or CY7C1049B-15VXC equivalent, key selection criteria include tAA = 15 ns read timing, ISB2 = 8 mA CMOS standby current (Commercial), tri-state I/O behavior under CE/OE/WE control, and SOJ package compatibility with through-hole SRAM sockets in aging embedded systems.

Technical Context

The CY7C1049B-15VXC implements a full asynchronous SRAM architecture with independent address decoding (A0–A18), eight bidirectional I/O lines (I/O0–I/O7), and three control inputs: CE (active-low chip enable), OE (active-low output enable), and WE (active-low write enable). Its internal power-down logic activates automatically when CE is HIGH, reducing ICC to ≤8 mA in Commercial CMOS mode.

It supports three standard read/write cycles: CE-controlled, OE-controlled, and WE-controlled (with OE LOW), each with defined setup/hold and transition timing (e.g., tSD = 8 ns, tHZOE = 7 ns). The device uses a center-power SOJ pinout (VCC on pins 15 & 36, GND on pins 1 & 20), enabling direct drop-in replacement for legacy 36-pin SRAMs in space-constrained PCB layouts.

Key Specifications

Pinout & Package

Package: 36-pin molded SOJ (400-mil), Pb-free, with center VCC/GND pinout (pins 15/36 = VCC; pins 1/20 = GND). Pin pitch: 0.050", body width: 0.400". Compatible with JEDEC MS-013AC footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS6C4008-15TIN and IS61LV5128-15K, the CY7C1049B-15VXC uniquely combines Pb-free 36-pin SOJ packaging, 2.0V data retention, and 5V TTL compatibility - making it the sole viable replacement for legacy 5V industrial systems requiring drop-in socket compatibility and battery-backed memory hold.

Availability

CY7C1049B-15VXC is available at Aetrix Electronics and suitable for industrial PLCs, legacy telecom line cards, military avionics displays, and medical imaging control boards requiring stable component supply and long-term obsolescence mitigation.

Supply support for CY7C1049B-15VXC 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 U.S.-based semiconductor company specializing in memory, PSoC, and USB solutions, founded in 1982 and headquartered in San Jose, California.

The CY7C1049B belongs to Cypress's legacy high-speed asynchronous SRAM product line, designed specifically for 5V industrial and telecom systems requiring reliable, socket-compatible memory with low-power retention modes.

FAQ

Is CY7C1049B-15VXC RoHS compliant?

Yes. The "VXC" suffix explicitly denotes Pb-free construction per JEDEC J-STD-609, verified in Cypress's 38-05169 Rev. *B datasheet. Lead finish is matte tin, and the package meets exemption 7a for high-melting-temperature solder alloys.

Can CY7C1049B-15VXC operate at 3.3V?

No. The device is specified only for 4.5V–5.5V operation. Attempting 3.3V supply violates Absolute Maximum Ratings (VCC must be ≥4.5V), resulting in undefined timing, increased ICC, and potential data corruption due to insufficient internal voltage margin.

What is the meaning of "center power and ground pinout" in the SOJ package?

It means VCC is assigned to pins 15 and 36 (opposite corners of the long edge), and GND to pins 1 and 20 (adjacent corners), creating symmetrical power delivery across the die. This reduces IR drop and ground bounce versus end-fed SOJ layouts, critical for noise-sensitive 15 ns timing margins.

Does CY7C1049B-15VXC support byte-wide writes?

No. It has no hardware byte-write enable. All eight bits (I/O0–I/O7) are written simultaneously when CE and WE are LOW. To update a single byte, the system must read-modify-write the full 8-bit word - requiring external logic or processor intervention.