Microchip Technology ATF750C-7JX

Overview

ATF750C-7JX from Atmel is a high-speed, electrically-erasable complex programmable logic device (CPLD) with 20 registered outputs, 42 array inputs, and 171 product terms. It delivers 7.5 ns pin-to-pin delay at 5V operation, supports D- or T-type flip-flops per register, and features programmable pin-keeper circuits for floating I/O stabilization. It is used in industrial control logic, legacy PLD upgrades, and embedded state-machine implementations.

For engineers reviewing the ATF750C-7JX datasheet, ATF750C-7JX pinout, ATF750C-7JX application, or ATF750C-7JX equivalent, key selection criteria include its 28-pin PLCC package, 5V ±5% supply compatibility, -40°C to +85°C industrial temperature range (per ordering code suffix), support for individual product-term clocking, and backward compatibility with ATV750B/BL and ATV750/L JEDEC files.

Technical Context

The ATF750C-7JX implements a 22V10 superset architecture with enhanced logic flexibility: each of its 20 flip-flops is individually configurable as D- or T-type and receives dedicated product-term clocking or direct input pin clocking. All 20 registers feed back independently into the 42-input combinatorial logic array, enabling buried state machines and full utilization of 171 product terms.

It provides two sum terms per output, variable product-term allocation (4–8 per sum term), and independent output-enable product terms. The device includes synchronous preset for all registers, asynchronous reset per flip-flop, and power-up reset that forces registers low upon VCC crossing 2.0–4.5 V, requiring monotonic VCC ramp and setup compliance before clock activation.

Key Specifications

Pinout & Package

ATF750C-7JX is packaged in a 28-lead Plastic J-leaded Chip Carrier (PLCC), compliant with JEDEC MS-018 Variation AB. Pin 1 is marked by a corner notch; pins are numbered counterclockwise. VCC (pin 28) and GND (pins 8, 15, 22) must be decoupled locally; pins 1, 8, 15, and 22 may be left unconnected in PLCC, though best practice connects VCC to pin 1 and GND to pins 8, 15, and 22 for superior noise immunity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar complex PLD applications.

Compared with ATF750C-10JU and ATF750CL-15JU, the ATF750C-7JX delivers the highest speed (7.5 ns) in the commercial-grade PLCC family, making it optimal for timing-critical industrial control upgrades where legacy 22V10 replacements require maximum performance headroom without switching to FPGA-level complexity.

Availability

ATF750C-7JX is available at Aetrix Electronics and suitable for industrial control logic, legacy system upgrades, and embedded state-machine implementations requiring stable component supply across extended production lifecycles.

Supply support for ATF750C-7JX 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

Atmel Corporation (now part of Microchip Technology) is a semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and programmable logic devices.

The ATF750C family was designed to deliver high-density, reprogrammable logic in standard PLD footprints, targeting industrial, automotive, and communications systems requiring field-upgradable glue logic and deterministic timing.

FAQ

What is the operating voltage range for the ATF750C-7JX?

The ATF750C-7JX operates at 5V ±5%, with absolute maximum ratings of -0.6V to +7.0V on any pin. Its DC characteristics-including input thresholds (VIL ≤ 0.8V, VIH ≥ 2.0V) and output drive (VOH ≥ 2.4V at -4 mA, VOL ≤ 0.5V at 16 mA)-are fully specified across this range. This ensures reliable interoperability with standard 5V TTL and CMOS interfaces without level-shifting circuitry. The ATF750C-7JX does not support 3.3V-only operation.

Does the ATF750C-7JX support pin-keeper functionality, and how is it enabled?

Yes, the ATF750C-7JX includes programmable pin-keeper circuits on all input and I/O pins. When activated, these circuits hold the last driven logic state (high or low) if the pin floats, preventing noise and leakage. Enablement is controlled during programming via the software compiler device selection menu-using "V750CPPK" for PDIP or "V750CPPKLCC" for PLCC variants in Atmel WinCUPL. The pin-keeper is disabled by default in JEDEC cross-programming modes.

How does the ATF750C-7JX handle power-up initialization?

The ATF750C-7JX performs automatic power-up reset: when VCC crosses the VRST threshold (2.0–4.5 V), all 20 registers are asynchronously forced low. Output polarity depends on buffer configuration. For reliable operation, VCC must rise monotonically, and all input/feedback setup times must be met before clock activation. The tPR reset duration is 600–1000 ns, ensuring deterministic state-machine startup without external reset ICs.

Can the ATF750C-7JX replace older ATV750 series devices?

Yes, the ATF750C-7JX is a direct functional and pin-compatible replacement for ATV750B/BL and ATV750/L devices. It supports their JEDEC files in cross-programming mode (V750B/V750), preserving fuse checksums and eliminating layout changes. However, full utilization of ATF750C-7JX advanced features-such as T-type flip-flops, pin-clocking, and preload-requires recompilation using Atmel WinCUPL with the native "V750C" device model.

What packaging and temperature options are available for the ATF750C-7JX?

The ATF750C-7JX is supplied exclusively in the 28-lead PLCC (28J) package and is rated for commercial temperature range (0°C to 70°C). While the ATF750C family offers industrial (-40°C to +85°C) and military variants in other speed grades and packages (e.g., ATF750C-10JU, ATF750C-10GM/883), the ATF750C-7JX itself is commercially specified and not qualified for extended temperature operation.