Infineon Technologies CY7C109B-12ZXC

Overview

CY7C109B-12ZXC from Cypress Semiconductor is a 128K × 8 (1,048,576-bit) high-speed CMOS static RAM with 12 ns access time, TTL-compatible I/O, and dual chip enable (CE1 active-low, CE2 active-high) for flexible memory expansion. It operates at 5V ±10%, supports automatic power-down when deselected, and retains data down to 2.0V. Used in industrial control buffers, legacy telecom line cards, and embedded instrumentation requiring deterministic read/write timing.

For engineers reviewing the CY7C109B-12ZXC datasheet, CY7C109B-12ZXC pinout, CY7C109B-12ZXC application, or CY7C109B-12ZXC equivalent, key selection criteria include tAA = 12 ns access time, ISB2 = 10 mA CMOS standby current, TSOP Type I 32-pin Pb-free package compatibility, and functional equivalence with CY7C1009B-12 variants under identical timing and voltage conditions.

Technical Context

This SRAM implements a full asynchronous interface with independent CE1/CE2 controls enabling seamless bank selection in multi-chip memory systems. Its tri-state I/O drivers and OE-controlled output enable support bus sharing without external logic.

The device uses standard CMOS process technology with on-die power-down circuitry activated by CE1 HIGH or CE2 LOW, reducing ICC to ≤10 mA (CMOS mode) while maintaining data integrity at VCC ≥ 2.0V. Address-to-data valid (tAA) and write cycle time (tWC) are both guaranteed at 12 ns over commercial temperature range (0°C to +70°C).

Key Specifications

Pinout & Package

Package: 32-pin Thin Small Outline Package (TSOP) Type I, 10.16 mm × 20.00 mm body, 0.5 mm lead pitch, Pb-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C109B-12ZXC, CY7C1009B-12VC offers identical electrical performance in a legacy SOJ package, while AS6C1008-12TIN trades dual CE flexibility for lower standby current and simplified control-making it viable only when bank-select logic is implemented externally.

Availability

CY7C109B-12ZXC is available at Aetrix Electronics and suitable for industrial PLC data buffering, legacy telecom line card upgrades, and embedded instrumentation display caching requiring stable component supply and long-term lifecycle support.

Supply support for CY7C109B-12ZXC 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 communications infrastructure markets.

CY7C109B belongs to Cypress's legacy parallel SRAM product line, engineered for deterministic timing, 5V system compatibility, and robust operation in mission-critical embedded environments.

FAQ

Is CY7C109B-12ZXC pin-compatible with CY7C1009B-12VC?

No. CY7C109B-12ZXC uses a 32-pin TSOP Type I package with 0.5 mm pitch, while CY7C1009B-12VC uses a 32-pin 300-mil SOJ package with 1.27 mm pitch. Footprint, soldering profile, and mechanical mounting differ significantly-PCB redesign is required for substitution.

Does CY7C109B-12ZXC support true 2.0V data retention during full power loss?

Yes. When VCC drops to 2.0V and CE1 is held HIGH or CE2 LOW, the device enters data retention mode with ICCDR ≤150 µA and guarantees data integrity for indefinite duration, provided ambient temperature remains within –40°C to +85°C and no input exceeds VCC + 0.5V.

Can CY7C109B-12ZXC operate with CE2 permanently tied HIGH?

Yes. With CE2 fixed HIGH, CE1 becomes the sole chip enable. This configuration simplifies interface logic and is functionally identical to standard single-CE SRAM operation, preserving all timing specifications including tAA = 12 ns and tWC = 12 ns.

What is the maximum capacitive load supported on I/O0–I/O7 for guaranteed 12 ns timing?

The device is characterized for 30 pF total load capacitance (including PCB trace, scope probe, and jig). Exceeding 30 pF increases tAA and tDOE beyond 12 ns and 6 ns respectively; derating curves in Figure 5 of datasheet Rev. *C show measurable delay increase above 25 pF.