Infineon Technologies CY7C109BN-12ZXCT

Overview

CY7C109BN-12ZXCT from Cypress Semiconductor is a 128K × 8 (131,072 × 8) high-speed CMOS static RAM with 12 ns access time, 5 V supply, TTL-compatible I/O, and automatic CE power-down. It operates in commercial temperature range (0°C to +70°C) and supports memory expansion via dual chip enables (CE1 active-low, CE2 active-high) and three-state outputs. Used in embedded controllers, industrial PLCs, and legacy instrumentation requiring fast, reliable non-volatile data buffering.

For engineers reviewing the CY7C109BN-12ZXCT datasheet, CY7C109BN-12ZXCT pinout, CY7C109BN-12ZXCT application, or CY7C109BN-12ZXCT equivalent, key selection criteria include tAA = 12 ns read timing, ISB2 standby current ≤10 mA at CMOS inputs, 2.0 V data retention capability, and TSOP Type I (32-pin) package compatibility with space-constrained PCB layouts.

Technical Context

This SRAM implements a full asynchronous interface with independent address decoding (A0–A16), bidirectional 8-bit I/O bus (I/O0–I/O7), and four control signals: CE1 (active-low), CE2 (active-high), OE (active-low), and WE (active-low). Its internal architecture uses a 512 × 256 × 8 memory array with sense amplifiers and input buffers optimized for low-noise, high-speed read/write cycles.

The device supports three distinct operational modes: active read (CE1=L, CE2=H, OE=L, WE=H), active write (CE1=L, CE2=H, WE=L), and automatic power-down (CE1=H or CE2=L), where ICC drops to ≤10 mA and data is retained down to VCC = 2.0 V. Output impedance transitions are specified under 5 pF and 30 pF loads per JEDEC AC test conditions.

Key Specifications

Pinout & Package

The CY7C109BN-12ZXCT is housed in a 32-pin Thin Small Outline Package (TSOP Type I), 8 mm × 20 mm body, with gull-wing leads and lead pitch of 0.5 mm. Pin 1 is marked by a beveled corner or notch on the top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61LV1024-12T and AS6C1008-12ZIN, the CY7C109BN-12ZXCT uniquely delivers 5 V operation, dual CE support, and 10 mA CMOS standby current in a TSOP I package-making it the only option for retrofitting 5 V industrial systems needing both expandability and low-power retention.

Availability

CY7C109BN-12ZXCT is available at Aetrix Electronics and suitable for industrial PLC data buffering, legacy test equipment memory caching, embedded controller boot ROM shadowing, and communications protocol stack buffering requiring stable component supply across long-lifecycle production programs.

Supply support for CY7C109BN-12ZXCT 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, automotive, and consumer applications.

The CY7C109BN belongs to Cypress's legacy high-speed parallel SRAM product line, designed specifically for 5 V embedded systems requiring deterministic timing, low-power standby, and easy memory expansion without external decoding logic.

FAQ

What is the minimum VCC required to retain data in CY7C109BN-12ZXCT?

The device guarantees data retention down to VCC = 2.0 V when CE1 is high or CE2 is low and all inputs are within valid CMOS thresholds. This mode draws ≤150 µA (ICCDR), enabling operation during brown-out or battery backup without external NVSRAM. Retention is not guaranteed below 2.0 V.

Can CY7C109BN-12ZXCT be used with 3.3 V logic interfaces?

No-its inputs require VIH ≥ 2.2 V and VIL ≤ 0.8 V referenced to a 5 V supply; driving it directly from 3.3 V logic violates VIH spec (2.2 V min) and risks unreliable reads. Level translation (e.g., TXB0108) or 5 V-tolerant 3.3 V drivers are mandatory for safe interfacing.

Does CY7C109BN-12ZXCT support byte-wide writes?

No-it has no byte-enable (UB/LB) pins. All eight bits (I/O0–I/O7) are written simultaneously during each write cycle. To update a single byte, the host must read-modify-write the full 8-bit word, increasing software overhead and bus traffic.

What is the meaning of "ZXC" in the part number CY7C109BN-12ZXCT?

"ZXC" denotes RoHS-compliant, lead-free TSOP Type I packaging (per JEDEC MO-153), with matte tin finish and halogen-free molding compound. The "T" suffix indicates tape-and-reel packaging (1,000 units per reel), standard for SMT production use.