Infineon Technologies CY37256P256-154BGC

Overview

CY37256P256-154BGC from Cypress Semiconductor is a 256-macrocell In-System Reprogrammable (ISR™) Complex Programmable Logic Device (CPLD) in the Ultra37000 family, operating at 5V with 154 MHz maximum frequency and 7.5 ns propagation delay. It features 192 I/O pins, five dedicated inputs (including four clock inputs), and JTAG-based reprogramming without pinout or timing changes. Used in legacy PCI-compliant interface logic, board-level glue logic, and FPGA companion control.

For engineers reviewing the CY37256P256-154BGC datasheet, CY37256P256-154BGC pinout, CY37256P256-154BGC application, or CY37256P256-154BGC equivalent, key selection criteria include macrocell count, I/O count per package variant, tPD/fMAX speed bin, bus-hold programmability, and 5V/3.3V I/O tolerance on VCCO pins.

Technical Context

The device implements a multi-block architecture with a global Programmable Interconnect Matrix (PIM) distributing up to 36 signals per logic block and supporting full macrocell feedback routing. Each of its logic blocks contains a 72×87 product term array, intelligent allocator for 0–16 product terms per macrocell, and four synchronous clocks plus one product-term clock.

It supports dual-voltage I/O via separate VCCO pins (5V or 3.3V), programmable slew rate per output, asynchronous set/reset per logic block, and configurable OE product terms controlling up to eight macrocells each. All I/Os include user-enabled bus-hold latches for high-impedance state retention.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY37256P256-154BGC, XC95288XL offers higher macrocell count but sacrifices 5V I/O tolerance and true in-system reprogrammability, while ATF1508AS provides footprint compatibility at the expense of performance, feature set, and design flexibility.

Availability

CY37256P256-154BGC is available at Aetrix Electronics and suitable for PCI add-in card development, industrial backplane redesign, and FPGA configuration management requiring stable component supply and long-lifecycle support.

Supply support for CY37256P256-154BGC 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, pin-stable, reprogrammable logic for legacy system upgrades and interface bridging where FPGA overhead is unnecessary and ASIC NRE cost prohibitive.

FAQ

Is CY37256P256-154BGC compatible with 3.3V I/O signaling?

Yes - when all VCCO pins are connected to 3.3V, outputs meet 3.3V JEDEC CMOS levels and remain 5V-tolerant on inputs. However, this device is a 5V-core part (CY37256, not CY37256V), so VCC must be 5V; only VCCO determines I/O voltage.

Does CY37256P256-154BGC support boundary scan testing?

Yes - it implements full IEEE 1149.1 JTAG boundary scan with TCK, TMS, TDI, and TDO pins. The JTAG chain supports both ISP programming and structural testing of board-level interconnects.

Can unused I/O pins be left floating without external pull-ups?

Yes - all I/Os feature user-programmable bus-hold circuitry. When enabled, they retain their last driven state during high-impedance conditions, eliminating need for external resistors and reducing noise susceptibility.

What development tools support CY37256P256-154BGC?

Cypress Warp v6.x and later, along with third-party tools including Mentor Graphics Precision RTL, Synplicity Synplify Pro, and Aldec Active-HDL fully support synthesis, place-and-route, and JTAG programming for this device.