Microchip Technology ATF16V8CZ-15PI

Overview

ATF16V8CZ-15PI from Microchip Technology (formerly Atmel) is a high-speed, electrically-erasable CMOS programmable logic device (PLD) with 12 ns pin-to-pin delay, 5 µA typical standby current, and industrial temperature range (-40°C to +85°C). It emulates 20-pin PAL devices including 16R8 and 16L8 families, supports three configuration modes (registered, complex, simple), and features internal pin-keeper circuits eliminating external pull-ups. Used in legacy system upgrades, glue logic replacement, and industrial control timing circuits.

For engineers reviewing the ATF16V8CZ-15PI datasheet, ATF16V8CZ-15PI pinout, ATF16V8CZ-15PI application, or ATF16V8CZ-15PI equivalent, key selection criteria include its 15 ns maximum propagation delay, industrial-grade operation, Flash-based reprogrammability, and compatibility with standard PAL development tools and JEDEC programming files.

Technical Context

The ATF16V8CZ-15PI implements an 8-macrocell architecture with configurable logic array and product-term-based sum-of-products logic. Each macrocell supports registered or combinatorial output, I/O, or dedicated input roles, with automatic mode selection based on register and OE usage in compiler software.

It integrates Flash memory for nonvolatile configuration storage, power-up reset circuitry ensuring deterministic low-state register initialization, and pin-keeper circuits using weak feedback inverters to maintain stable logic levels without DC current draw - critical for low-power asynchronous systems.

Key Specifications

Pinout & Package

ATF16V8CZ-15PI is supplied in a 20-lead plastic dual-inline package (PDIP), designated 20P3, with 0.300" body width and through-hole mounting. Pin 1 is marked by a notch or dot; top-view pin numbering follows standard DIP convention.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ATF16V8CZ-15PI, the -15JI offers identical functionality in a surface-mount PLCC for higher-density layouts, while the -15PU provides RoHS-compliant SOIC packaging - both retain the 15 ns delay, 5 µA standby, and industrial temperature qualification essential for legacy system continuity.

Availability

ATF16V8CZ-15PI is available at Aetrix Electronics and suitable for industrial control systems, legacy computing upgrades, and medical instrumentation requiring stable component supply over extended production lifecycles.

Supply support for ATF16V8CZ-15PI 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

Microchip Technology acquired Atmel in 2016 and maintains full support for legacy Atmel PLD products including the ATF16V8CZ family.

The ATF16V8CZ product line was designed to provide Flash-based, pin-compatible replacements for industry-standard 20-pin PAL devices in industrial and commercial control applications.

FAQ

What is the maximum operating frequency supported by the ATF16V8CZ-15PI?

The ATF16V8CZ-15PI supports up to 62 MHz with internal feedback and 45 MHz with external feedback, derived from its 15 ns maximum propagation delay and specified setup/hold timing. These frequencies apply under industrial temperature conditions with 5 V ±10% supply, and actual system-level performance depends on board layout, loading, and logic depth. The ATF16V8CZ-15PI's fMAX values are measured per JEDEC-compliant test conditions and reflect guaranteed timing margins for robust operation.

Does the ATF16V8CZ-15PI require external pull-up resistors on its I/O pins?

No, the ATF16V8CZ-15PI incorporates 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 power consumption and simplifying BOM. The ATF16V8CZ-15PI's keeper strength is sufficient to maintain logic levels against typical noise but can be overdriven by standard TTL/CMOS drivers requiring only 40 µA.

Can the ATF16V8CZ-15PI replace older PAL devices like the 16R8 or 16L8?

Yes, the ATF16V8CZ-15PI is explicitly designed to emulate multiple 20-pin PAL families. In registered mode, it replaces 16R8, 16RP8, and 16R6; in complex mode, it substitutes for 16L8, 16H8, and 16P8; and in simple mode, it supports 10L8, 12L6, and 14L4. The ATF16V8CZ-15PI achieves this via software-configurable macrocell modes and accepts standard JEDEC programming files generated for those legacy devices.

What programming voltage is required for the ATF16V8CZ-15PI?

The ATF16V8CZ-15PI uses standard 5 V programming - no elevated voltage (e.g., 12 V) is required. Programming is performed via conventional ISP or socket programmers supporting Atmel's Flash PLD protocol. The device accepts VPP = VCC = 5 V ±10%, with absolute maximum input voltage of +14 V during programming - a safety margin, not an operational requirement. All programming operations for the ATF16V8CZ-15PI occur at the same supply voltage used for normal operation.

Is the ATF16V8CZ-15PI RoHS compliant?

The ATF16V8CZ-15PI itself is not RoHS compliant - it is a leaded PDIP device manufactured prior to full RoHS transition. However, Microchip offers green alternatives including ATF16V8CZ-15PU (SOIC) and ATF16V8CZ-15JU (PLCC), both Pb/Halide-free and RoHS compliant. For new designs requiring compliance, those variants are recommended; the ATF16V8CZ-15PI remains available for legacy repair and maintenance where leaded packaging is acceptable.