仕様
| 属性 | 値 |
| Supplier | Lattice Semiconductor Corporation |
| Package / Case | Box |
| Series | GAL®20V8 |
| Part Status | Obsolete |
| Programmable Type | EE PLD |
| Delay Timetpd(1)Max | 25 ns |
| Voltage Supply - Internal | 4.5V ~ 5.5V |
| Number of Macrocells | 8 |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Mounting Type | Through Hole |
概要
Description
GAL20V8B-25LPI is a small, reprogrammable General Array Logic (GAL) device from the 20V8 family. It provides 8 macrocells of programmable logic in a 20-pin (LPI) package, capable of implementing combinational logic with up to 8 registered outputs (flip-flops) for simple state machines.
Key points:
- On-chip EEPROM for nonvolatile, reusable configuration; reprogrammable without masks.
- 25 ns speed grade (the “25”), typical 5V supply (≈4.75–5.25 V).
- Programming via a GAL programmer (or in-system tools) using PALASM/ABEL-style descriptions.
- Common uses: glue logic, address decoding, small counters, and other control logic in microcontroller/system designs.
Advantages: nonvolatile, easy iteration, faster than masked ROM PALs.
Limitations: lower density and bandwidth than CPLDs/FPGA, better suited to simple, small-scale logic.
Key points:
- On-chip EEPROM for nonvolatile, reusable configuration; reprogrammable without masks.
- 25 ns speed grade (the “25”), typical 5V supply (≈4.75–5.25 V).
- Programming via a GAL programmer (or in-system tools) using PALASM/ABEL-style descriptions.
- Common uses: glue logic, address decoding, small counters, and other control logic in microcontroller/system designs.
Advantages: nonvolatile, easy iteration, faster than masked ROM PALs.
Limitations: lower density and bandwidth than CPLDs/FPGA, better suited to simple, small-scale logic.
Equivalent
Do you want exact cross-reference part numbers from suppliers (Digi-Key/Mouser) or general functional equivalents (other GAL/EPLD/CPLD families)? Please confirm packaging (DIP28/PLCC28) and preferred vendors so I can give precise replacements.
Features
Key features of GAL20V8B-25LPI:
- 8 programmable macrocells for implementing combinational and registered logic
- PLA-based architecture suitable as a PAL replacement
- In-system programmable (windowed fuse-based programming)
- Speed grade -25 (about 25 ns)
- 5 V operation with TTL-compatible input thresholds
- 28-pin Plastic DIP package (LPI)
- Reprogrammable and reusable for glue logic and small state machines
- Low power, static operation
- Commonly used for replacing legacy PAL devices with a more flexible device
- 8 programmable macrocells for implementing combinational and registered logic
- PLA-based architecture suitable as a PAL replacement
- In-system programmable (windowed fuse-based programming)
- Speed grade -25 (about 25 ns)
- 5 V operation with TTL-compatible input thresholds
- 28-pin Plastic DIP package (LPI)
- Reprogrammable and reusable for glue logic and small state machines
- Low power, static operation
- Commonly used for replacing legacy PAL devices with a more flexible device
Pinout
- Pin count: 28 pins (28-pin package)
- Function: GAL20V8B is a GAL (Generic Array Logic) programmable logic device (PLD) with about 20 macrocells, used to implement user-defined combinational and sequential logic (PAL/PLD replacement). The -25LPI indicates 25 ns speed grade and Pb-free plastic DIP industrial packaging.
- Function: GAL20V8B is a GAL (Generic Array Logic) programmable logic device (PLD) with about 20 macrocells, used to implement user-defined combinational and sequential logic (PAL/PLD replacement). The -25LPI indicates 25 ns speed grade and Pb-free plastic DIP industrial packaging.
Manufacturer
- Manufacturer: Lattice Semiconductor (Lattice Semiconductor Corporation).
- Company type: An American fabless semiconductor company that designs and markets programmable logic devices, including GALs, CPLDs, and FPGAs.
- Company type: An American fabless semiconductor company that designs and markets programmable logic devices, including GALs, CPLDs, and FPGAs.
Application
Applications of GAL20V8B-25LPI:
- Glue logic for microprocessor/microcontroller systems: address decoding, peripheral selection, bus control
- Implementation of small finite-state machines and timing/sequencing logic
- Decoding/encoding, multiplexing/demultiplexing and general data-path control
- Timing generation and synchronization circuits
- Interface logic for peripherals (LEDs, keyboards, displays, sensors)
- Prototyping and low-volume/retrofit of TTL-based designs in consumer, industrial, and automotive electronics
- Glue logic for microprocessor/microcontroller systems: address decoding, peripheral selection, bus control
- Implementation of small finite-state machines and timing/sequencing logic
- Decoding/encoding, multiplexing/demultiplexing and general data-path control
- Timing generation and synchronization circuits
- Interface logic for peripherals (LEDs, keyboards, displays, sensors)
- Prototyping and low-volume/retrofit of TTL-based designs in consumer, industrial, and automotive electronics
Package
Package type: LPI stands for Leadless Plastic Package. GAL20V8B-25LPI uses a leadless, surface-mount plastic package.
