Microchip Technology ATF20V8BQL-15JU

Overview

ATF20V8BQL-15JU from Atmel is a high-performance, electrically-erasable programmable logic device (PLD) in PLCC-28 package, supporting registered, complex, and simple PAL emulation modes with 8 macrocells, 7.5 ns minimum pin-to-pin delay, 15 ns maximum propagation delay, and industrial temperature range (-40°C to +85°C). It delivers 5 mA standby and 20 mA active supply current for low-power system control applications.

For engineers reviewing the ATF20V8BQL-15JU datasheet, ATF20V8BQL-15JU pinout, ATF20V8BQL-15JU application, or ATF20V8BQL-15JU equivalent, this page provides verified functional architecture, mode-specific logic allocation, power/thermal behavior, and direct replacement guidance for legacy 24-pin PAL systems.

Technical Context

The ATF20V8BQL-15JU implements a universal 8-macrocell architecture configurable into three distinct operational modes: Registered (for state machines), Complex (combinatorial I/O with OE control), and Simple (fixed combinatorial outputs). Each macrocell allocates up to eight product terms to its sum term, with dedicated output enable paths and internal feedback routing.

It uses Atmel's Flash-based nonvolatile memory for reprogrammability, supports 20-year data retention and 100 erase/write cycles, and integrates input/I/O pull-up resistors, 2,000V ESD protection, and 200 mA latchup immunity. Its PCI-compliant I/O structure ensures compatibility with 5V TTL/CMOS bus environments.

Key Specifications

Pinout & Package

ATF20V8BQL-15JU is housed in a 28-lead Plastic J-Leaded Chip Carrier (PLCC) package with standard JEDEC MS-018 AB footprint, 12.32 mm × 12.32 mm body size, and 1.27 mm lead pitch. Pin 1 identifier is marked by a corner chamfer.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ATF20V8B-15JI and ATF20V8BQL-15PI, the ATF20V8BQL-15JU uniquely combines industrial temperature qualification, ultra-low 5 mA standby current, and PLCC-28 compatibility-making it the sole choice for power-constrained, surface-mount industrial control upgrades.

Availability

ATF20V8BQL-15JU is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy system bus interface, automated test equipment pattern logic, and medical device control sequencing requiring stable component supply across extended product lifecycles.

Supply support for ATF20V8BQL-15JU 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 was a U.S.-based semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and programmable logic devices before its acquisition by Microchip Technology in 2016.

The ATF20V8BQL series belongs to Atmel's Flash-based PLD family designed specifically to replace obsolete bipolar and UV-erasable PALs in industrial and telecom infrastructure with reprogrammable, low-power, and RoHS-compliant alternatives.

FAQ

What is the maximum operating frequency supported by ATF20V8BQL-15JU?

The ATF20V8BQL-15JU supports a maximum external feedback clock frequency of 45 MHz, derived from its 15 ns propagation delay and 12 ns setup time. This value is measured under industrial conditions (VCC = 5V ±10%, TA = -40°C to +85°C) and applies to Registered and Complex Mode configurations where feedback paths are used. Internal feedback yields 50 MHz, while no-feedback operation reaches 62 MHz.

Does ATF20V8BQL-15JU require external pull-up resistors on input pins?

No, ATF20V8BQL-15JU includes internal input and I/O pull-up resistors, ensuring all un-driven pins float to VCC and maintain defined logic states. These weak pull-ups are compatible with TTL drivers and eliminate the need for external components in most glue logic applications-reducing BOM cost and PCB area without compromising noise immunity.

Can ATF20V8BQL-15JU emulate a GAL20V8 device?

Yes, ATF20V8BQL-15JU can emulate GAL20V8 functionality in Registered Mode using compiler-generated JEDEC files. The architecture supports identical macrocell count, product term allocation, and pin feedback structure. Emulation is validated for GAL20V8_R, GAL20V8_C7, and GAL20V8_C8 variants, with timing differences accounted for via speed grade selection (e.g., -15JU matches GAL20V8-15L).

What happens to registered outputs during power-up on ATF20V8BQL-15JU?

During power-up, ATF20V8BQL-15JU performs a synchronized reset: when VCC crosses the 3.8–4.5 V VRST threshold, all registers are forced low, resulting in high-level registered outputs due to active-low output polarity. This deterministic initialization ensures safe state machine startup and eliminates race conditions-provided VCC rise is monotonic and input setup times are met before first clock edge.

Is ATF20V8BQL-15JU RoHS compliant?

Yes, ATF20V8BQL-15JU is manufactured in Pb/halide-free, RoHS-compliant packaging per Atmel's green package options. The "U" suffix in the ordering code explicitly denotes compliance with EU Directive 2011/65/EU, including restriction of lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE substances to allowable thresholds.