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GAL20V8B-25LPI

Name: GAL20V8B-25LPI
Rating: 4.7 (12 reviews)

IC CPLD 8MC 25NS 24DIP

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製造商。部分 #GAL20V8B-25LPI
包 24-DIP (0.300, 7.62mm)
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規格

Supplier	Lattice Semiconductor Corporation
Package	Box
Series	GAL®20V8
ProductStatus	Obsolete
ProgrammableType	EE PLD
DelayTimetpd(1)Max	25 ns
VoltageSupply-Internal	4.5V ~ 5.5V
NumberofMacrocells	8
OperatingTemperature	-40°C ~ 85°C (TA)
MountingType	Through Hole
Package/Case	24-DIP (0.300, 7.62mm)

概述

Description

GAL20V8B-25LPI is a small, one-time programmable EPLD (Generic Array Logic) device from Lattice. It provides a compact amount of programmable logic (macrocells) to implement simple glue logic, decoders, small state machines, or timing logic between devices.
Key points:
- Architecture: ~20 macrocells for combinational and small sequential logic.
- Speed grade: -25 (about 25 ns).
- Package: LPI (packaging code for this device family).
- Programming: fuse-based, non-volatile after programming (OTP) using a GAL programmer.
- Use cases: glue logic, peripheral interfacing, simple controllers, timing/decoding tasks.
- Pros: inexpensive, compact, easy to use for small logic needs.
- Cons: non-reprogrammable after programming, lower density than modern CPLDs/FPGA, older technology.
For exact pinout, timing, and packaging details, consult the Lattice GAL20V8B datasheet.

Features

Here are the typical features of the GAL20V8B-25LPI:
- 8 macrocells for implementing up to 8 independent logic functions
- 20 input pins and 8 outputs
- Programmable logic with a sum-of-products style array (no external gates needed)
- Speed grade of -25 (approximately 25 ns)
- 5V operation; TTL-compatible input thresholds
- Reprogrammable via standard GAL programming methods (fuse-link style, erasable/re-programmable)
- Low-power CMOS technology in a Plastic DIP (LPI) package
- Compact 20-pin package suitable for small footprint designs
Note: Availability of industrial/commercial temperature grades and exact electrical characteristics can vary by supplier and revision; consult the specific datasheet for your exact part variant.

Package

Plastic DIP, 28-pin package (DIP‑28).

Pinout

- Pin count: 20 pins (20-pin package, DIP/PLD form).
- Function: GAL20V8B is a programmable array logic device (8-macrocell GAL) used to implement user-defined combinational logic (glue logic), with optional registered outputs for each macrocell.

Manufacturer

Manufacturer: Lattice Semiconductor.
Kind of company: A semiconductor company that designs and markets programmable logic devices (PLDs, CPLDs, FPGAs).

Application

Applications of GAL20V8B-25LPI:
- Glue logic for microprocessors/microcontrollers
- Address decoding and chip-select logic for memory/peripherals
- Finite state machines and general control logic
- Peripheral interfaces (keyboard, displays, UART, I/O expansion)
- Timing control, clock division and gating
- Pattern matching, multiplexing and data routing
- Low-volume TTL/MSI replacement and quick prototyping

Equivalent

Direct substitutes are limited. The closest drop-in equivalents are:
- Lattice GAL20V8B family in the same package/speed (e.g., GAL20V8B-25LPI and other -25/-LP variants)
- Atmel/Microchip ATF20V8B-25 (and ATF20V8B-25LPI) as pin-compatible alternatives
For exact cross-references, use Lattice’s cross-reference tool or distributor catalogs (DigiKey, Mouser). If a different family is needed, a redesign is usually required (e.g., GAL22V10/GAL16V8 may not be drop-in).