Infineon Technologies CY37064P44-125JXCT

Overview

CY37064P44-125JXCT from Cypress Semiconductor is a 64-macrocell In-System Reprogrammable (ISR™) Complex Programmable Logic Device (CPLD) in a 44-pin TQFP package, operating at 5V with 125 MHz maximum frequency (tPD = 12.5 ns), PCI-compatible I/O, and JTAG-based reconfiguration. It features four synchronous clocks, programmable bus-hold on all I/Os, and supports 32 or 64 I/O pins depending on configuration.

For engineers reviewing the CY37064P44-125JXCT datasheet, CY37064P44-125JXCT pinout, CY37064P44-125JXCT application, or CY37064P44-125JXCT equivalent, key selection criteria include macrocell count, ISR capability, JTAG boundary-scan compliance, 5V/3.3V I/O flexibility via VCCO, and deterministic timing unaffected by product-term steering or sharing.

Technical Context

The CY37064P44-125JXCT implements the Ultra37000 architecture with two logic blocks, each containing a 72×87 product term array, intelligent product term allocator (0–16 terms per macrocell), and 16 macrocells. Its Programmable Interconnect Matrix (PIM) delivers fixed, route-independent timing by incorporating worst-case delays into published specs.

It supports flexible clocking: four global synchronous clocks (CLK0–CLK3) with polarity control, plus an asynchronous product-term clock (PTCLK); all I/Os feature programmable slew rate (fast/slow) and bus-hold for noise immunity and unconnected-pin tolerance during prototyping.

Key Specifications

Pinout & Package

Package: 44-pin Thin Quad Flat Package (TQFP), 10 mm × 10 mm, 0.8 mm pitch, RoHS-compliant and lead-free (JXCT suffix).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar CPLD-based glue logic applications.

Compared with XC9572XL-10VQG44C and ATF1504AS-10AU44, the CY37064P44-125JXCT uniquely combines 5V operation, PCI compliance, bus-hold, and four dedicated clocks-making it optimal for legacy bus integration where voltage flexibility and deterministic timing are mandatory.

Availability

CY37064P44-125JXCT is available at Aetrix Electronics and suitable for PCI add-in card development, industrial PLC I/O expansion, and legacy bus interface adapter designs requiring stable component supply and long-term obsolescence management.

Supply support for CY37064P44-125JXCT 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 fabless semiconductor company specializing in programmable logic, memory, and USB/USB-C solutions for industrial, automotive, and communications markets.

The Ultra37000 CPLD family was designed to deliver high-density, pin-stable, in-system reprogrammable logic for mission-critical glue logic, bus interface, and control applications where timing predictability and field-upgradability are essential.

FAQ

What voltage levels does CY37064P44-125JXCT support on its I/O pins?

The device operates from a 5V VCC supply and supports both 3.3V and 5V I/O signaling via separate VCCO pins. When VCCO = 5V, outputs meet 5V TTL levels; when VCCO = 3.3V, outputs comply with 3.3V JEDEC CMOS standards and remain 5V-tolerant-enabling seamless interfacing with mixed-voltage systems without external level shifters.

Can CY37064P44-125JXCT be reprogrammed while soldered on the target PCB?

Yes. The device features In-System Reprogrammability (ISR™) via its IEEE 1149.1 JTAG interface (TCK, TMS, TDI, TDO). Reprogramming can be performed in-circuit using standard JTAG tools, and design changes do not alter pinout or timing behavior-critical for field firmware updates and late-stage logic corrections.

How many clock domains can be implemented simultaneously in this CPLD?

The CY37064P44-125JXCT provides four dedicated global synchronous clocks (CLK0–CLK3), each with programmable polarity, plus one asynchronous product-term clock (PTCLK). This enables up to five independent clock domains-supporting multi-rate interfaces, gated clock trees, and asynchronous event capture without external clock generators.

Does this device require external pull-up resistors on unused I/O pins?

No. All I/O pins feature programmable bus-hold circuitry-a weak internal latch that retains the last driven logic state during high-impedance conditions. This eliminates the need for external pull-ups, reduces BOM count, prevents floating inputs in unconnected or tri-stated configurations, and improves noise immunity in industrial environments.