Infineon Technologies CY37256P160-125AXI

Overview

CY37256P160-125AXI from Cypress Semiconductor is a 256-macrocell In-System Reprogrammable (ISR™) Complex Programmable Logic Device (CPLD) in the Ultra37000 family, operating at 5V with 160 I/O pins and 125 MHz maximum frequency (tPD = 7.5 ns). It features four synchronous clocks, programmable bus-hold on all I/Os, and JTAG-compliant ISR for field reconfiguration without pinout or timing changes. Used in PCI-compliant interface logic, legacy bus bridging, and control plane glue logic.

For engineers reviewing the CY37256P160-125AXI datasheet, CY37256P160-125AXI pinout, CY37256P160-125AXI application, or CY37256P160-125AXI equivalent, key selection criteria include macrocell count, I/O count (160), tPD (7.5 ns), VCCO flexibility (5V/3.3V I/O support), and JTAG-based ISR capability for post-deployment logic updates.

Technical Context

The device implements a multi-block architecture with a global Programmable Interconnect Matrix (PIM) distributing up to 36 signals per logic block, eliminating route-dependent delays. Each of its logic blocks contains a 72 × 87 product term array, intelligent product term allocator, and 16 macrocells - supporting 0–16 product terms per macrocell with steering and sharing.

It supports five dedicated inputs (four clock-capable), programmable slew rate per output, asynchronous set/reset via dedicated product terms, and configurable clock polarity on all four synchronous clocks (CLK0–CLK3) plus a product-term clock (PTCLK). All I/Os feature user-enabled bus-hold latching.

Key Specifications

Pinout & Package

CY37256P160-125AXI is housed in a 160-lead TQFP (Thin Quad Flat Package) with 0.5 mm pitch, 24 × 24 mm body size, and exposed thermal pad. Pin numbering follows standard counter-clockwise convention starting from pin 1 (top-left corner, marked dot).

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC95288XL-10TQ144I and MAX7000S EPM7128SLC84-10, CY37256P160-125AXI uniquely combines 160 I/Os, 5V/3.3V I/O flexibility, true JTAG ISR, and PCI compliance - making it optimal for upgradeable industrial and communications control logic where pin compatibility and timing stability across revisions are critical.

Availability

CY37256P160-125AXI is available at Aetrix Electronics and suitable for PCI add-in card development, industrial PLC I/O expansion, and legacy bus bridging requiring stable component supply and long-term lifecycle support.

Supply support for CY37256P160-125AXI 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.

CY37256P160-125AXI belongs to the Ultra37000 CPLD family, designed specifically for high-reliability, field-upgradable control logic in systems requiring deterministic timing, mixed-voltage I/O, and JTAG-based system-level reconfiguration.

FAQ

Is CY37256P160-125AXI compatible with 3.3V I/O buses?

Yes - when VCCO pins are connected to 3.3V, the device delivers JEDEC-standard 3.3V CMOS output levels and accepts 5V-tolerant inputs. This dual-voltage capability enables seamless interfacing with both legacy 5V and modern 3.3V subsystems without external level shifters.

Does this device support in-system programming after PCB assembly?

Yes - CY37256P160-125AXI implements full IEEE 1149.1 JTAG boundary-scan and In-System Reprogrammability (ISR™). Programming occurs via TCK/TMS/TDI/TDO pins while mounted on the board, enabling firmware-driven logic updates without device removal or system downtime.

What is the maximum number of product terms usable per macrocell?

Up to 16 product terms can be allocated to any single macrocell via the intelligent product term allocator. The device's 72 × 87 local product term array provides 80 general-purpose terms per logic block, with additional dedicated terms for OE, set, reset, and clock functions.

Can unused I/O pins be left unconnected safely?

Yes - all I/Os feature programmable bus-hold circuitry. When enabled, bus-hold maintains the last driven logic state during high-impedance conditions, preventing floating inputs and reducing system noise. This allows safe NC (no-connect) treatment of unused pins during prototyping or production.