Infineon Technologies CY7C344B-15JC

Overview

CY7C344B-15JC from Cypress Semiconductor is a 32-macrocell, 0.65-µm CMOS EPROM-based EPLD in a 28-pin PLCC package, delivering 15 ns maximum access time. It integrates 8 dedicated inputs, 16 bidirectional I/O pins, and 64 expander product terms within a single logic array block (LAB), enabling complex registered/combinatorial logic replacement for TTL and 74HC families in industrial control backplanes.

For engineers reviewing the CY7C344B-15JC datasheet, CY7C344B-15JC pinout, CY7C344B-15JC application, or CY7C344B-15JC equivalent, key selection criteria include its 83.3 MHz max register toggle frequency, 10 ns synchronous clock-to-output delay, dual-mode (synchronous/asynchronous) operation, and support for buried registers even with all I/Os driven.

Technical Context

The CY7C344B-15JC implements a single LAB architecture with fully interconnected inputs, macrocells, and I/Os-no inter-LAB routing. Its 32 macrocells each support registered or combinatorial output, and two expanders per input path enable flexible logic synthesis without external glue.

It supports both global synchronous clocking (with tSU = 9 ns, tCO1 = 10 ns) and asynchronous clocking (tAS1 = 5 ns, tACO1 = 15 ns), and includes 16 buried registers usable even when all 16 I/O pins are configured as outputs-critical for state machine implementation.

Key Specifications

Pinout & Package

Package: 28-pin Plastic Leaded Chip Carrier (PLCC), J64 footprint, 11.43 mm × 11.43 mm body, gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar EPLD logic replacement applications.

Compared with EPF10K20RC240-4 and ISPLSI2032-80LJ, the CY7C344B-15JC delivers guaranteed 15 ns performance with zero configuration latency and industrial-grade non-volatile operation-making it optimal for safety-critical, timing-deterministic replacements where predictability trumps configurability.

Availability

CY7C344B-15JC is available at Aetrix Electronics and suitable for industrial PLC backplanes, medical instrument control sequencing, and avionics data acquisition interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY7C344B-15JC 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 programmable logic, memory, and USB/USB-C solutions for industrial and automotive markets.

The CY7C344B belongs to Cypress's MAX®-compatible EPLD product line, designed specifically to provide pin-compatible, non-volatile, high-speed logic replacement for legacy TTL and 74HC systems in cost-sensitive, long-lifecycle applications.

FAQ

What is the maximum operating temperature range for CY7C344B-15JC?

The CY7C344B-15JC is rated for industrial operation from –40°C to +85°C with 5 V ±10% supply. This rating is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics section of the official datasheet (Document #: 38-03036 Rev. **), and applies to both PLCC (JC) and cerDIP (WC) variants.

Does CY7C344B-15JC require external configuration hardware?

No. The CY7C344B-15JC uses on-chip EPROM technology and powers up fully operational with no configuration delay. Unlike SRAM-based FPGAs, it requires no external PROM, JTAG initialization, or power-on reset sequencing-configuration is retained indefinitely without power.

Can unused I/O pins be left floating?

No. Per Cypress design recommendations, all unused inputs-including dedicated inputs and I/O pins configured as inputs-must be tied to VCC or GND. Floating inputs may cause excessive ICC current, logic contention, or metastability due to internal noise sensitivity in the 0.65-µm CMOS process.

How many registers remain available when all 16 I/O pins are used as outputs?

16 buried registers remain available. The datasheet explicitly states: "Even if all of the I/O pins are driven by macrocell registers, there are still 16 'buried' registers available." These are internal-only flip-flops not connected to package pins, usable for state storage or pipeline staging without consuming I/O resources.