Microchip Technology ATF20V8B-7SC

Overview

ATF20V8B-7SC from Atmel is a high-performance, electrically-erasable programmable logic device (PLD) in 24-pin SOIC package, delivering 7.5 ns pin-to-pin delay, 5V CMOS/TTL compatibility, and support for registered, complex, and simple PAL emulation modes. It serves as a drop-in replacement for 20R8, 20L8, and 14L8 families in legacy digital control, glue logic, and state machine applications.

For engineers reviewing the ATF20V8B-7SC datasheet, ATF20V8B-7SC pinout, ATF20V8B-7SC application, or ATF20V8B-7SC equivalent, this page provides verified functional architecture, mode-specific timing behavior, power consumption profiles across standby/active states, PCI-compliant I/O drive capability, and confirmed green (RoHS-compliant) packaging options.

Technical Context

The ATF20V8B-7SC implements a universal 8-macrocell PLD architecture with Flash-based nonvolatile configuration, supporting three software-configurable operating modes: Registered (for sequential logic), Complex (combinatorial I/O with OE control), and Simple (dedicated combinatorial outputs). Each macrocell allocates up to eight product terms to its sum term.

It features internal input/I/O pull-up resistors, 20-year data retention, 100 erase/write cycles, 2,000V ESD protection, and 200 mA latchup immunity. Timing is fully specified over 5V ±5% at 0°C–70°C (Commercial range), with tPD = 7.5 ns, tCO = 5 ns, and tS = 5 ns.

Key Specifications

Pinout & Package

ATF20V8B-7SC is supplied in a 24-lead, 0.300" wide plastic gull-wing small outline (SOIC) package (package code 24S), compliant with JEDEC MS-012. Pin 1 is marked by a beveled corner or notch; top-view pinout matches industry-standard 24-pin PLD layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with GAL20V8-15LP and ATF22V10C-10PU, the ATF20V8B-7SC uniquely combines Flash reprogrammability, 24-pin SOIC compatibility, and guaranteed 7.5 ns performance in a commercial-temperature, RoHS-compliant package-making it the optimal choice for legacy system sustainment and mid-complexity control logic.

Availability

ATF20V8B-7SC is available at Aetrix Electronics and suitable for legacy system repair, industrial controller upgrades, and automated test equipment maintenance requiring stable component supply and long-term obsolescence mitigation.

Supply support for ATF20V8B-7SC 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 for embedded and industrial applications.

The ATF20V8B product line was designed to provide Flash-based, reprogrammable replacements for legacy PAL devices-targeting cost-sensitive, high-reliability applications in telecom, instrumentation, and industrial automation.

FAQ

What is the maximum operating frequency supported by ATF20V8B-7SC?

The ATF20V8B-7SC supports up to 100 MHz in external feedback configuration (1/(tS + tCO)), 125 MHz in internal feedback mode, and 125 MHz in no-feedback operation. These values derive directly from its 5 ns tCO and 5 ns tS specifications under commercial conditions. Actual system frequency depends on board layout, loading, and compiler-generated logic depth. The ATF20V8B-7SC datasheet confirms these limits in the AC Characteristics table on page 4.

Does ATF20V8B-7SC require external pull-up resistors on its inputs?

No, the ATF20V8B-7SC includes internal weak pull-up resistors on all inputs and I/O pins, ensuring defined logic states when left un-driven. This eliminates the need for external pull-ups in most applications, reducing BOM count and board space. The pull-ups are explicitly documented in the "Input and I/O Pull-ups" section (page 6) and reflected in DC leakage current specs (IIL/IIH).

Can ATF20V8B-7SC replace a 20R8 PAL in an existing design?

Yes, the ATF20V8B-7SC is architecturally designed to emulate the 20R8 family in Registered Mode, with identical pinout, voltage levels, and timing behavior. Its JEDEC file compatibility and automatic mode selection allow direct substitution without logic redesign. The datasheet lists 20R8, 20RP8, and 20R6 as emulated devices in the Registered Mode section (page 7).

Is ATF20V8B-7SC RoHS compliant?

Yes, the ATF20V8B-7SC is offered in green package options compliant with Pb/Halide-free and RoHS directives. This is confirmed in the "ATF20V8B Green Package Options" table (page 15), where the -7SC suffix denotes the standard SOIC variant meeting RoHS requirements. No leaded or halogenated materials are used in its construction.

What happens to registered outputs during power-up on ATF20V8B-7SC?

During power-up, all registers in the ATF20V8B-7SC reset to the low state at VRST (~3.8–4.5 V), resulting in high-impedance or high-level outputs depending on OE and polarity configuration. This Power-up Reset (tPR = 600–1000 ns) ensures deterministic initialization for state machines. The behavior is guaranteed per the "Power-up Reset" section (page 5) and requires monotonic VCC ramp and adherence to setup timing before first clock edge.