Microchip Technology ATF16V8C-5XC

Overview

ATF16V8C-5XC from Atmel is a 20-pin electrically-erasable programmable logic device (EE PLD) with 5 ns maximum pin-to-pin delay, 100 μA pin-controlled power-down mode, and CMOS/TTL-compatible I/O. It implements a universal 8-macrocell architecture supporting registered, complex, and simple modes to emulate PAL devices including 16R8, 16L8, and 10L8 in industrial control logic and legacy system upgrades.

For engineers reviewing the ATF16V8C-5XC datasheet, ATF16V8C-5XC pinout, ATF16V8C-5XC application, or ATF16V8C-5XC equivalent, key selection criteria include its JEDEC-compatible 16V8 programming model, configurable power-down on Pin 4, internal pin-keeper circuits eliminating external pull-ups, and support for commercial temperature range (0°C to 70°C) in TSSOP-20 package.

Technical Context

The ATF16V8C-5XC uses Atmel's flash-based EECMOS technology enabling 100 erase/write cycles and 20-year data retention. Its architecture supports three automatic software-configured operating modes - registered (clocked outputs), complex (OE-controlled combinatorial I/O), and simple (dedicated combinatorial outputs) - each allocating up to eight product terms per macrocell.

Pin 4 serves as an optional power-down control: when asserted high, supply current drops below 100 μA while latching all register and output states; when unused, it functions as logic input I3. Internal pin-keeper circuits replace pull-up resistors, eliminating DC leakage and ensuring stable logic levels without external components.

Key Specifications

Pinout & Package

ATF16V8C-5XC is packaged in a 20-lead Thin Shrink Small Outline Package (TSSOP-20, code 20X), measuring 6.5 mm × 4.4 mm × 1.2 mm with 0.65 mm lead pitch. The package is RoHS-compliant, lead-free, and optimized for automated SMT placement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ATF16V8C-5XC, ATF16V8B-5XC offers higher endurance and longer data retention at identical speed and package, while GAL16V8D-15LP lacks in-system reprogrammability and power-down capability - making ATF16V8C-5XC optimal for cost-sensitive, field-upgradable commercial designs.

Availability

ATF16V8C-5XC is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy system PAL replacement, and embedded instrumentation signal routing requiring stable component supply across commercial temperature range and RoHS-compliant packaging.

Supply support for ATF16V8C-5XC 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) designed high-reliability non-volatile programmable logic and microcontroller solutions for industrial, automotive, and consumer applications before its 2016 acquisition.

The ATF16V8C product line delivers flash-based, JEDEC-compatible PLDs targeting cost-effective replacement of obsolete PAL devices in commercial-grade systems requiring field reprogrammability and low-power operation.

FAQ

What is the maximum operating frequency supported by the ATF16V8C-5XC?

The ATF16V8C-5XC supports up to 142 MHz in external feedback configuration (1/(tS + tCO)), 166 MHz in internal feedback mode, and 166 MHz in no-feedback operation. These frequencies are guaranteed over the full commercial temperature range (0°C to 70°C) and 5 V ± 5% supply, with timing validated per Table 3-1 of the official Atmel 0425H datasheet. The ATF16V8C-5XC achieves this using its 5 ns pin-to-pin delay and deterministic macrocell routing.

Does the ATF16V8C-5XC require external pull-up resistors on its I/O pins?

No, the ATF16V8C-5XC integrates internal pin-keeper circuits on all I/O and input pins, eliminating the need for external pull-up resistors. These weak feedback inverters hold the last valid logic state without drawing DC current - reducing system power consumption by >100 μA per pin and simplifying schematic design. This feature is active in all operating modes of the ATF16V8C-5XC and requires no configuration.

Can the ATF16V8C-5XC be programmed using standard 16V8 JEDEC files?

Yes, the ATF16V8C-5XC is fully JEDEC 16V8-compatible and accepts standard 16V8 fuse files generated by ABEL, CUPL, OrCAD-PLD, and other industry compilers. When the power-down feature is disabled in the design file, the ATF16V8C-5XC behaves identically to a 16V8C device. The ATF16V8C-5XC's programming interface and fuse map align with JEDEC JED specification, enabling seamless integration into existing PAL programming workflows.

What happens to output states during power-down mode on the ATF16V8C-5XC?

When Pin 4 is asserted high to activate power-down mode on the ATF16V8C-5XC, all registered and combinatorial output data are latched and held at their last valid logic levels. Outputs previously in high-impedance (HI-Z) remain HI-Z. Internal logic states are preserved, and clock/input transitions are ignored - ensuring deterministic behavior during low-power sleep. Recovery occurs within 20–30 ns after PD goes low, as specified in Table 3-2 for tDLOV.

Is the ATF16V8C-5XC RoHS-compliant and lead-free?

Yes, the ATF16V8C-5XC carries the "X" suffix indicating RoHS compliance and lead-free construction per JEDEC standard. It uses a green, halogen-free molding compound and matte-tin lead finish in its TSSOP-20 (20X) package. This compliance is confirmed in Atmel Document 0425H (March 2011 revision), which explicitly lists ATF16V8C-5XC among updated green package options and removes lead-based variants from the ordering table.