Infineon Technologies CY37256VP256-66BBI

Overview

CY37256VP256-66BBI from Cypress Semiconductor is a 256-macrocell In-System Reprogrammable (ISR™) Complex Programmable Logic Device (CPLD) in the Ultra37000 family, operating at 3.3V with 66 ns maximum propagation delay (tPD) and 100 MHz maximum frequency (fMAX). It features five dedicated inputs-including four programmable clock pins-192 I/O pins in a 256-pin Fine-Pitch BGA package, and JTAG-compliant ISR for field reconfiguration without pinout or timing changes. It is used in PCI-compliant interface logic, legacy bus bridging, and FPGA configuration glue logic.

For engineers reviewing the CY37256VP256-66BBI datasheet, CY37256VP256-66BBI pinout, CY37256VP256-66BBI application, or CY37256VP256-66BBI equivalent, key selection criteria include its 3.3V operation with 5V-tolerant I/Os, programmable slew rate per output, bus-hold on all I/Os, flexible product term allocation (0–16 terms/macrocell), and deterministic timing model free of fanout or expander delays.

Technical Context

The CY37256VP256-66BBI implements a modular architecture with multiple logic blocks interconnected via a fully global Programmable Interconnect Matrix (PIM), where all inputs-including macrocell feedbacks and device pins-pass through the PIM with fixed, worst-case delay incorporated into tPD specifications. Each logic block contains a 72 × 87 product term array, intelligent allocator, 16 macrocells, and supports up to four synchronous clocks (CLK0–CLK3) plus one asynchronous product term clock (PTCLK).

It delivers deterministic timing by eliminating route-dependent delays: no fanout, expander, PIM-path, or product-term-steering penalties apply; all macrocells support configurable register modes (D/T/latch), polarity-controlled set/reset, and independent OE control using dedicated product terms. Its 3.3V VCC supply enables low-power operation while maintaining 5V-tolerant I/Os compliant with JEDEC 3.3V CMOS levels.

Key Specifications

Pinout & Package

Package: 256-pin Fine-Pitch Ball Grid Array (FBGA), 17 mm × 17 mm, 1.0 mm ball pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY37256VP256-66BBI, the XC95288XL-10TQ144 offers faster timing but sacrifices voltage flexibility and I/O robustness, while the ispMACH 4256V-10T100 trades I/O count and clock resource richness for smaller packaging-making the CY37256VP256-66BBI optimal for 3.3V systems requiring 192 I/Os, four dedicated clocks, and field-upgradable glue logic.

Availability

CY37256VP256-66BBI is available at Aetrix Electronics and suitable for PCI interface design, FPGA configuration management, and industrial legacy bus bridging requiring stable component supply, long-lifecycle support, and guaranteed 3.3V CPLD availability.

Supply support for CY37256VP256-66BBI 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 memory, microcontrollers, and programmable logic solutions for industrial, automotive, and communications markets.

The Ultra37000 CPLD family was designed to deliver high-density, pin-compatible, and timing-predictable programmable logic for system-level glue logic, interface bridging, and FPGA companion functions-emphasizing in-system reprogrammability and deterministic timing.

FAQ

Is CY37256VP256-66BBI compatible with 5V logic systems?

Yes-its I/Os are 5V-tolerant when VCCIO = 3.3V, allowing direct connection to 5V buses without level shifters. Input thresholds meet JEDEC 3.3V CMOS specs (VIH ≥ 2.0V), satisfying PCI Local Bus requirements. However, the core logic operates strictly at 3.3V, and 5V must never be applied to VCC or VCCIO pins.

What development tools support CY37256VP256-66BBI programming?

Cypress Warp v6.0+ and third-party tools including Lattice ispLEVER Classic (via CPLD import) support this device. Programming uses standard IEEE 1149.1 JTAG interface with TCK/TMS/TDI/TDO; no external programming voltage is needed since it supports 3.3V ISP. Boundary scan testing and logic verification are fully integrated.

Does CY37256VP256-66BBI support mixed-voltage I/O operation?

No-it does not support split-rail I/O banks. All I/Os share a common VCCIO = 3.3V supply, and all 192 pins operate at the same voltage level. While 5V-tolerant, they cannot drive 5V outputs or accept 5V inputs while powered at 3.3V-only withstand 5V on inputs under high-impedance or driven conditions per JEDEC spec.

How does the product term allocator affect timing predictability?

The allocator dynamically routes 0–16 product terms per macrocell and enables sharing across macrocell groups without introducing variable delay. All worst-case steering and sharing configurations were characterized during silicon validation and baked into the 66 ns tPD specification-so timing remains identical regardless of term distribution or reuse.