Microchip Technology ATF20V8BQ-10PC

Overview

ATF20V8BQ-10PC from Atmel is a high-speed, electrically-erasable programmable logic device (PLD) in 24-pin PDIP package, featuring 7.5 ns pin-to-pin delay, 35 mA standby current, and 40 mA active current at 5V. It supports registered, complex, and simple PAL emulation modes and operates across commercial temperature range (0°C to 70°C) for legacy digital logic replacement in control and interface circuits.

For engineers reviewing the ATF20V8BQ-10PC datasheet, ATF20V8BQ-10PC pinout, ATF20V8BQ-10PC application, or ATF20V8BQ-10PC equivalent, key selection criteria include its Flash-based reprogrammability, three configurable logic modes, internal pull-up resistors, PCI compliance, and support for 24-pin PAL family replacements including 20R8, 20L8, and 14L8.

Technical Context

The ATF20V8BQ-10PC implements a universal 8-macrocell architecture with per-macrocell configuration for registered output, combinatorial I/O, combinatorial output, or dedicated input. Each macrocell allocates up to eight product terms, and mode selection (Registered/Complex/Simple) is determined automatically by compiler or manually via JEDEC file.

It uses Atmel's Flash memory technology enabling 100 erase/write cycles and 20-year data retention. Input and I/O pins integrate weak internal pull-up resistors, ensuring known logic states during floating conditions, while supporting CMOS/TTL-compatible voltage levels (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and 2,000V ESD protection.

Key Specifications

Pinout & Package

ATF20V8BQ-10PC is supplied in 24-lead, 0.300" wide plastic dual-inline package (PDIP), pin-compatible with industry-standard 24-pin PAL sockets. Pin 1 is CLK/IN, pins 2–11 and 13 are inputs, pins 15–22 are I/Os, pin 23 is OE/IN, pin 12 is GND, and pin 24 is VCC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable logic device applications.

Compared with GAL20V8-15LP, ATF20V8BQ-10PC offers field reprogrammability and lower power; compared with ATF22V10C-10PU, it retains 24-pin DIP compatibility and simpler toolchain support for PAL replacement-making it optimal for cost-sensitive, socket-based legacy upgrades.

Availability

ATF20V8BQ-10PC is available at Aetrix Electronics and suitable for industrial control logic, legacy system emulation, PCI interface glue logic, and embedded power sequencing requiring stable component supply and long-term obsolescence mitigation.

Supply support for ATF20V8BQ-10PC 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 with emphasis on embedded control and industrial applications.

The ATF20V8B(Q)(L) family was designed to provide Flash-based, reprogrammable alternatives to bipolar PALs for cost-sensitive, socket-replaceable logic in industrial, telecom, and computing infrastructure.

FAQ

What is the maximum operating frequency supported by ATF20V8BQ-10PC?

The ATF20V8BQ-10PC supports up to 100 MHz external feedback operation (1/(tS + tCO) = 100 MHz), with tS = 7.5 ns and tCO = 7 ns. Its 10 ns maximum pin-to-pin delay enables reliable timing closure in synchronous logic designs without added buffering or pipeline stages. The ATF20V8BQ-10PC achieves this performance across its full commercial temperature range (0°C to 70°C) at 5V ± 5% supply.

Does ATF20V8BQ-10PC require external pull-up resistors on input or I/O pins?

No, the ATF20V8BQ-10PC integrates internal weak pull-up resistors on all input and I/O pins, ensuring defined logic-high states when left un-driven. These pull-ups are sufficient to prevent floating inputs in typical bus-interface or switch-debounce applications and eliminate the need for external discrete resistors-reducing BOM count and PCB area. The ATF20V8BQ-10PC maintains compatibility with TTL drivers that can easily override these internal pull-ups.

Can ATF20V8BQ-10PC emulate a 20R8 PAL device?

Yes, the ATF20V8BQ-10PC natively supports 20R8 emulation in Registered Mode, allocating eight product terms per macrocell and using CLK and OE pins for synchronous operation. Compiler tools such as ABEL, CUPL, and OrCAD-PLD automatically generate compatible JEDEC files. The ATF20V8BQ-10PC matches 20R8 pinout in 24-pin PDIP and delivers identical functional behavior-including register initialization on power-up-making it a direct drop-in replacement.

What is the power-up reset behavior of ATF20V8BQ-10PC?

The ATF20V8BQ-10PC features an internal asynchronous power-up reset that triggers when VCC crosses VRST (3.8–4.5 V), forcing all registers to low and registered outputs to high. This occurs within 600–1000 ns (tPR) and ensures deterministic state-machine initialization. To guarantee reliable reset, VCC must rise monotonically, and input setup times must be met before the first clock edge. The ATF20V8BQ-10PC requires no external reset circuitry for basic initialization.

Is ATF20V8BQ-10PC RoHS compliant?

Yes, the ATF20V8BQ-10PC is offered in Pb/halide-free, RoHS-compliant packaging per Atmel's green package options. The "-10PC" suffix denotes the 24-pin PDIP variant meeting EU Directive 2011/65/EU requirements. Lead finish is matte tin, and all materials comply with JEDEC J-STD-609A Class 1 marking standards. The ATF20V8BQ-10PC is suitable for new designs targeting global environmental compliance without derating or qualification delays.