Infineon Technologies CY37128P160-125AC

Overview

CY37128P160-125AC from Cypress Semiconductor is a 128-macrocell In-System Reprogrammable (ISR™) Complex Programmable Logic Device (CPLD) in the Ultra37000 family, operating at 5V with 160-pin TQFP packaging. It delivers 125 MHz maximum frequency (f_MAX), 6.5 ns propagation delay (t_PD), and supports 128 I/O pins with programmable bus-hold, slew rate control, and four synchronous clocks. Used in PCI-compliant interface logic, FPGA configuration glue, and legacy system upgrades where pinout stability across design iterations is critical.

For engineers reviewing the CY37128P160-125AC datasheet, CY37128P160-125AC pinout, CY37128P160-125AC application, or CY37128P160-125AC equivalent, key selection criteria include its JTAG-based ISR capability, fixed timing under logic changes, 5V/3.3V I/O tolerance via VCCO configuration, dedicated clock inputs, and product-term steering/sharing architecture enabling efficient macrocell utilization without speed penalty.

Technical Context

The CY37128P160-125AC implements a multi-block CPLD architecture with a global Programmable Interconnect Matrix (PIM) routing all I/O and macrocell feedback signals to eight logic blocks-each containing a 72×87 product term array, intelligent allocator, and 16 macrocells. All inputs pass through the PIM with no route-dependent delay; worst-case PIM propagation is fully embedded in published t_PD and f_MAX specs.

Each logic block provides four synchronous clocks (CLK0–CLK3), one asynchronous product-term clock (PTCLK), programmable polarity per clock, and independent high-speed/low-power mode selection. The device uses dedicated input/clock pins for timing-critical paths and supports combinatorial, registered, double-registered, or latched input configurations with configurable clock source assignment.

Key Specifications

Pinout & Package

Package: 160-lead Thin Quad Flat Package (TQFP), 24 mm × 24 mm, 0.5 mm pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC95144XL-10TQ144 and EPM7128SLC84-10, the CY37128P160-125AC offers superior timing predictability via its fixed-delay PIM, integrated bus-hold for robustness in noisy industrial environments, and true JTAG-compliant ISR - making it optimal for PCI-compliant, field-upgradable, and mixed-voltage legacy interface applications.

Availability

CY37128P160-125AC is available at Aetrix Electronics and suitable for PCI add-in cards, FPGA configuration controllers, legacy bus translators, and industrial I/O expansion modules requiring stable component supply and long-term obsolescence mitigation.

Supply support for CY37128P160-125AC 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 Ultra37000 CPLD family was designed to deliver high-density, pinout-stable, and timing-predictable programmable logic for system-level glue logic, interface bridging, and FPGA companion functions - targeting applications where reprogrammability and deterministic timing outweigh raw gate count.

FAQ

What voltage levels does CY37128P160-125AC support on its I/O pins?

The device operates with a 5V core supply (VCC) but supports both 3.3V and 5V I/O signaling. When VCCO pins are tied to 3.3V, outputs meet JEDEC 3.3V CMOS standards and remain 5V-tolerant. When VCCO = 5V, outputs drive full 5V TTL levels. This dual-voltage capability enables seamless interfacing with mixed-voltage systems without level shifters.

Can CY37128P160-125AC be reprogrammed while installed on a live circuit board?

Yes - it features true In-System Reprogrammability (ISR™) via IEEE 1149.1 JTAG. The device can be reconfigured in-circuit using standard JTAG tools without power cycling or physical removal. Design changes retain identical pinout and timing behavior, allowing firmware updates and logic fixes without impacting board layout or system timing margins.

How many clocks can be used simultaneously in a single design on this CPLD?

The device provides four global synchronous clocks (CLK0–CLK3) plus one asynchronous product-term clock (PTCLK), all accessible to every macrocell. Each clock has independently programmable polarity, enabling rising- and falling-edge triggering within the same logic block. No external clock distribution logic is needed - all five clocks are routed internally with guaranteed skew and delay specifications.

Does CY37128P160-125AC require external pull-up resistors on unused I/O pins?

No - it includes programmable bus-hold circuitry on all I/O pins. When enabled, bus-hold weakly latches the last driven logic state, eliminating floating inputs and reducing system noise. This feature removes the need for external pull-up/down resistors during prototyping or in high-reliability applications where unconnected pins must remain stable.