Infineon Technologies CY7C109B-15ZXCT

Overview

CY7C109B-15ZXCT from Cypress Semiconductor is a 128K × 8 (1,048,576-bit) high-speed CMOS static RAM with 15 ns access time, TTL-compatible I/O, dual chip enable (CE1 active-low, CE2 active-high), and automatic power-down when deselected. It operates at 5V ±10% over commercial temperature range (0°C to +70°C) and is used in embedded controllers, industrial PLCs, and legacy communication interface buffers requiring deterministic, non-volatile data retention during low-power states.

For engineers reviewing the CY7C109B-15ZXCT datasheet, CY7C109B-15ZXCT pinout, CY7C109B-15ZXCT application, or CY7C109B-15ZXCT equivalent, key selection criteria include tAA = 15 ns read timing, ISB2 = 10 mA CMOS standby current, VCC = 5V operation, and compatibility with 32-pin TSOP Type I (Pb-free) packaging for space-constrained PCB layouts.

Technical Context

This SRAM implements a fully decoded 17-bit address bus (A0–A16) supporting 131,072 word locations, with tri-state bidirectional I/O0–I/O7 pins controlled by independent CE1, CE2, OE, and WE logic. Its dual CE architecture enables seamless memory expansion without external gating logic.

The device uses CMOS process technology to achieve 11 mW max standby power (L version) and 2.0V data retention voltage, entering automatic power-down when CE1 is HIGH or CE2 is LOW - a feature critical for battery-backed systems where supply voltage may sag below nominal levels.

Key Specifications

Pinout & Package

Package: 32-pin Thin Small Outline Package (TSOP) Type I, Pb-free, body size 11.8 mm × 10.0 mm, 0.5 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS6C1008-15TIN and IS61LV102416-15TQLI, CY7C109B-15ZXCT offers unique dual CE support and 5V compatibility - essential for maintaining legacy system timing and interconnect integrity without redesign.

Availability

CY7C109B-15ZXCT is available at Aetrix Electronics and suitable for industrial PLCs, legacy communication interface modules, and embedded controller boot memory requiring stable component supply across extended production lifecycles.

Supply support for CY7C109B-15ZXCT 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, microcontrollers, and programmable logic solutions for industrial and embedded markets.

The CY7C109B belongs to Cypress's legacy parallel SRAM product line, designed specifically for systems requiring pin-compatible upgrades from older NMOS or HMOS memories while delivering improved speed, power efficiency, and reliability.

FAQ

What is the maximum clock frequency supported by CY7C109B-15ZXCT?

CY7C109B-15ZXCT is an asynchronous SRAM and does not use a clock signal. Its performance is defined by access time (tAA = 15 ns) and cycle time (tRC = 15 ns), meaning it supports up to ~66.7 MHz effective random-access throughput when interfaced with a properly timed bus controller. No internal oscillator or clock input exists.

Can CY7C109B-15ZXCT operate at 3.3V?

No. CY7C109B-15ZXCT is specified only for 5V ±10% operation (4.5V to 5.5V). Applying 3.3V will result in undefined behavior, failure to meet timing specifications, and potential data corruption. For 3.3V systems, consider Cypress's later-generation low-voltage SRAMs such as the CY62167 series.

Does CY7C109B-15ZXCT require an external refresh circuit?

No. As a static RAM, CY7C109B-15ZXCT retains data indefinitely as long as power is applied and does not require periodic refresh cycles. This eliminates refresh overhead in microcontroller or FPGA designs and simplifies timing-critical applications like real-time data buffering.

Is the TSOP package of CY7C109B-15ZXCT RoHS-compliant?

Yes. The "X" suffix in CY7C109B-15ZXCT explicitly denotes Pb-free (RoHS-compliant) construction. The TSOP Type I package uses lead-free solder plating and complies with EU Directive 2011/65/EU, verified through Cypress's official material declarations and IPC-1752 reporting.