Infineon Technologies CY7C341B-25JC

Overview

CY7C341B-25JC from Cypress Semiconductor is a 192-macrocell Erasable Programmable Logic Device (EPLD) based on MAX® architecture, implementing user-configurable combinational and registered logic functions. It features 12 Logic Array Blocks (LABs), 8 dedicated inputs (including one system clock input), 64 bidirectional I/O pins, 384 expander product terms, and operates at 5V with 25 ns maximum access time in commercial temperature range (0°C to +70°C).

For engineers reviewing the CY7C341B-25JC datasheet, CY7C341B-25JC pinout, CY7C341B-25JC application, or CY7C341B-25JC equivalent, key selection considerations include macrocell count, LAB-level expander term allocation, fixed-delay programmable interconnect array (PIA), I/O configuration flexibility, and EPROM-based nonvolatile configuration security.

Technical Context

The CY7C341B-25JC implements a fully user-programmable MAX® architecture with 12 LABs-each containing 16 macrocells, 32 expander product terms, and dedicated I/O blocks. All macrocell feedback paths route through the PIA, enabling full inter-LAB signal routing without timing skew.

Its programmable interconnect array delivers fixed delay (14–20 ns), eliminating variable routing-induced skews common in gate arrays. The device supports both synchronous and asynchronous clocking modes, with separate timing parameters for dedicated inputs (tPD1 = 25 ns), I/O inputs (tPD2 = 40 ns), and register-to-output (tCO1 = 14 ns).

Key Specifications

Pinout & Package

The CY7C341B-25JC is packaged in an 84-pin Plastic Leaded Chip Carrier (PLCC), J83 package type, with gull-wing leads and body size 29.31 mm × 29.31 mm. Pin 1 is marked by a corner notch; pin numbering proceeds counterclockwise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C341B-25JC, CY7C342B-25JC offers scalable density within identical mechanical and electrical constraints, while ATF1504AS-25JC shifts to Flash technology and 3.3V operation-requiring full redesign of power delivery, I/O interfacing, and programming infrastructure.

Availability

CY7C341B-25JC is available at Aetrix Electronics and suitable for industrial control logic, legacy TTL replacement, embedded boot controller, and ATE pattern generation requiring stable component supply and long-lifecycle support.

Supply support for CY7C341B-25JC 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 mixed-signal solutions for industrial, automotive, and communications markets.

The CY7C341B belongs to the MAX® EPLD product line, designed specifically for high-density, nonvolatile, pin-compatible logic consolidation in cost-sensitive, long-lifecycle applications where field reprogrammability is not required.

FAQ

Is CY7C341B-25JC UV-erasable, and what equipment is needed?

Yes, CY7C341B-25JC uses UV-erasable EPROM cells housed in a windowed ceramic package variant (e.g., -25HC), but the -25JC variant is plastic-leaded (PLCC) and non-UV-erasable. Erasure requires exposure to 253.7 nm UV light at ≥12,000 µW/cm² for 20–30 minutes. The -25JC must be programmed once and retained permanently; it cannot be erased in-circuit or with standard UV erasers.

What is the maximum number of I/O pins usable simultaneously in a design?

All 64 I/O pins can be used concurrently, but actual utilization depends on LAB resource allocation: LABs A/F/G/L allocate 8 I/O-connected macrocells each, while LABs B–E/H–K allocate only 4. Total I/O pin count remains 64, but simultaneous registered I/O drive capability is constrained by macrocell-to-I/O mapping-not pin count alone.

Does CY7C341B-25JC support hot-swap or live-insertion?

No. The device lacks hot-swap protection circuitry. Power sequencing must follow strict ramp requirements: VCC must stabilize before applying any input signals, and all inputs must remain within GND < VIN < VCC during power transitions. Violation risks latch-up or permanent damage per Absolute Maximum Ratings (−2.0 V to +7.0 V transient limit).

How does the programmable interconnect array (PIA) affect timing predictability?

The PIA guarantees fixed 14–20 ns routing delay regardless of signal path length or fanout-unlike FPGA routing fabrics. This eliminates timing skew between parallel logic paths, enabling deterministic setup/hold timing across all LABs and simplifying static timing analysis for pipeline-critical applications like ATE waveform generation.