GAL16V8B-25LP - 25ns E2CMOS CPLD | Lattice Semiconductor
Référence : GAL16V8B-25LP ✗ Fin de vieGAL16V8B-25LP Présentation
A CPLD is a semiconductor that stores a user's logic configuration in nonvolatile memory and implements that configuration through interconnected programmable macrocells. The GAL16V8B belongs to the GAL16V8 family, where the generic array architecture combines a configurable AND array with output logic macrocells. This places it in the CPLD and programmable-logic hierarchy alongside PAL-compatible devices while providing a convenient fusemap-oriented design flow.
Key features include UltraMOS advanced CMOS technology, E2CMOS nonvolatile configuration storage, a maximum propagation delay of 5 ns for the stated device data, and a maximum frequency of 166 MHz. The low-power configuration is specified at 75 mA typical supply current. Its 8 macrocells make it suitable for compact address decoding, interface control, state-machine logic, and glue logic rather than dense FPGA workloads.
The GAL16V8B architecture can implement PAL-type arrangements through configurable output logic macrocells, giving designers access to multiple registered and combinational configurations. The exact -25 designation identifies the speed grade, while the LP suffix identifies the 20-pin PDIP package used in through-hole assemblies. Because GAL16V8 devices are programmed rather than mask-programmed, they support design revisions and reusable logic configurations.
Typical applications include legacy peripheral interfacing, bus arbitration and decoding, industrial control logic, test-fixture sequencing, and compact state-machine implementations. In each case, the device provides a practical migration path for existing GAL16V8 or compatible PAL designs when an older CPLD requires replacement without changing the board footprint.
PCB design should preserve the GAL16V8B pin arrangement, provide normal decoupling close to the supply connection, and include a programming interface if the fuse map changes during production. Before substituting a newer GAL16V8D device, verify AC timing, DC parameters, macrocell behavior, and programming compatibility against the manufacturer datasheet.
This page combines the device's core architectural and timing characteristics with package-focused replacement guidance, an explicit parameter comparison, and practical implementation notes. It is intended to help engineers identify whether the GAL16V8B-25LP can be retained on an existing design or replaced on the same 20-pin through-hole footprint.
Alternatives de remplacement direct pour GAL16V8B-25LP — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
GAL16V8D-25LP
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
GAL16V8D-25LPN
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
GAL16V8B-25LPI
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
GAL16V8B-25LP Valeurs maximales et caractéristiques électriques
| Device Type | E2CMOS Programmable Logic Device |
| Logic Architecture | Generic Array Logic (GAL) |
| Macrocells | 8 macrocells |
| Speed Grade | 25 ns |
| Process Technology | UltraMOS Advanced CMOS |
| Configuration Technology | E2CMOS nonvolatile memory |
| Supported Architecture | PAL-type programmable logic |
| Maximum Propagation Delay | 5 ns |
| Maximum Frequency | 166 MHz |
| Maximum Clock Input to Data Output Delay | 4 ns |
| Courant d'alimentation | 75 mA typical in low-power mode |
| Tension d'alimentation | 5 V |
| Boîtier | PDIP-20 |
| Nombre de broches | 20 pins |
| Type de montage | Through-hole |
| Statut RoHS | unknown |
Guide de configuration des broches du GAL16V8B-25LP pdip-20
Configuration des broches du GAL16V8B-25LP (boîtier pdip-20). Ce circuit intégré numérique comprend des GPIO, des interfaces de communication (UART, SPI, I2C) et des broches d'alimentation. Consultez la fiche technique du fabricant pour les fonctions alternatives des broches et les options de configuration. Indispensable pour la conception de systèmes embarqués et la conception de circuits imprimés.
Aucune donnée de brochage détaillée disponible pour GAL16V8B-25LP.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
GAL16V8B-25LP convient pour 6 applications: Industrial Control Logic, Bus Address Decoding, Peripheral Interface Control, Test and Measurement Sequencing, Legacy Equipment Maintenance, Embedded System Glue Logic.
Industrial Control Logic
The GAL16V8B-25LP fits compact industrial control blocks that combine state-machine logic, relay sequencing, and peripheral command decoding. Its 8 macrocells provide enough architecture for deterministic control functions without moving an existing GAL16V8 assembly to a different package. The 25 ns speed grade supports short propagation intervals, while the stated 5 ns maximum propagation delay and 166 MHz maximum frequency provide timing margin for registered and combinational control paths. Engineers should compare every setup, hold, and output-delay requirement against the manufacturer datasheet, especially at industrial temperature extremes, because the suffix does not by itself establish the complete qualification profile.
Recommandé
Bus Address Decoding
The GAL16V8B-25LP is useful for decoding a small address map into chip-select or control signals because its GAL16V8 architecture supports PAL-compatible combinational configurations. Eight macrocells can distribute decoded outputs while retaining logic for qualified or registered controls. The 5 ns maximum propagation delay stated for the device helps reduce decoding uncertainty in short synchronous control loops. When replacing it, preserve the original output polarity, feedback routing, and macrocell assignment because a physically identical package does not guarantee that every architecture-specific connection behaves identically.
Recommandé
Peripheral Interface Control
A GAL16V8B-25LP can implement the command, handshake, and status logic required around legacy memory or I/O devices. Its PAL-compatible architecture makes it practical to recreate established GAL16V8 fusemaps in a 20-pin through-hole design, and the 25 ns grade supports common control-clock rates. The design should treat output disable, clock, and feedback functions according to the selected macrocell configuration rather than treating the GAL16V8 as a conventional fixed-function IC. Validate bus contention, setup, and hold timing with the slowest external device on the board.
Recommandé
Test and Measurement Sequencing
The GAL16V8B-25LP can implement deterministic test sequences, instrument-control state machines, and measurement fixture routing in compact test systems. Its 8 macrocells allow several sequencing steps and output controls to be combined without a larger FPGA, while E2CMOS nonvolatile configuration supports repeatable operation after power cycling. The stated 166 MHz maximum frequency is useful for evaluating clocked sections, but fixture timing must also include relay drivers, comparator delays, and system software latency. During migration, confirm that output enable polarity and registered-output behavior match the original fixture logic.
Recommandé
Legacy Equipment Maintenance
The GAL16V8B-25LP is particularly relevant to maintenance of older instruments, industrial controllers, and custom interface boards that use GAL16V8 devices. The PDIP-20 package allows a failed component to be replaced without a PCB layout change when a pin-compatible GAL16V8D option is qualified. Before installation, verify the complete ordering suffix, fuse map, programming polarity, and supply requirements. The replacement should be tested for every registered output and feedback path because some legacy boards depend on architecture-specific behavior that is not obvious from a standard pin drawing.
Recommandé
Embedded System Glue Logic
The GAL16V8B-25LP can implement board-level glue logic around processors, memories, and custom peripherals, including arbitration, command qualification, and power-state sequencing. Its E2CMOS configuration is nonvolatile, and the 20-pin PDIP format is practical for repairable through-hole equipment. The device is best suited to modest logic counts rather than broad FPGA workloads; eight macrocells must cover the Boolean equations, registered stages, and feedback requirements. Engineers should evaluate propagation delay against processor setup time and ensure unused outputs are assigned to safe states in the fuse map.
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Récapitulatif des produits recommandés
Données de référence d'ingénierie pour GAL16V8B-25LP — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | GAL16V8D-25LP | GAL16V8D-25LPN | GAL16V8B-25LPI |
|---|---|---|---|---|
| Package | PDIP-20 | PDIP-20 | PDIP-20 | PDIP-20 |
| Brand | Lattice Semiconductor | Lattice Semiconductor | Lattice Semiconductor | Lattice Semiconductor |
| Device Type | E2CMOS Programmable Logic Device | E2CMOS Programmable Logic Device | E2CMOS Programmable Logic Device | E2CMOS Programmable Logic Device |
| Logic Architecture | GAL Generic Array Logic | GAL Generic Array Logic | GAL Generic Array Logic | GAL Generic Array Logic |
| Macrocells | 8 macrocells | 8 macrocells | 8 macrocells | 8 macrocells |
| Speed Designation | 25 ns | 25 ns | 25 ns | 25 ns |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V |
| Configuration Storage | E2CMOS nonvolatile memory | E2CMOS nonvolatile memory | E2CMOS nonvolatile memory | E2CMOS nonvolatile memory |
Principaux différenciateurs
- Exact same-base family option for legacy assemblies (vs GAL16V8B-25LPI)
- Later cross-reference generation with the same speed designation (vs GAL16V8D-25LP)
- Eight-macrocell PAL-compatible architecture in a through-hole package (vs GAL16V8D-25LPN)
Notes de conception
Do not treat matching PDIP outlines as sufficient proof of drop-in compatibility. GAL16V8 devices use configurable output logic macrocells, so the clock, feedback, output-enable, and product-term assignments can differ with the selected architecture. Compare the complete pin-description and macrocell tables, then verify that the replacement supports the intended fuse map and programming polarity before releasing it into production.
Estimated: using the specified 5 V supply and 75 mA typical low-power supply current, the GAL16V8B-25LP consumes about 0.375 W at the device pins before output loading and board losses are added. Confirm the actual operating mode and external logic loads in the final power budget. This estimate is not a maximum-power rating and should not be used to waive thermal or supply-current verification.
Keep the PCB layout tied to the manufacturer's 20-pin PDIP footprint and verify orientation, notch position, and pin-1 marking against the package drawing. Programmed GAL16V8 devices can be sensitive to incorrect insertion or programming fixture alignment. For repaired assemblies, inspect sockets and connector contacts for bent pins, oxidation, or insufficient pin engagement before assuming a configuration or timing problem exists.
Check setup, hold, clock-to-output, and output-disable timing at the actual system clock rather than relying only on the 25 ns speed designation or 166 MHz maximum frequency. External bus devices may determine the effective timing margin. For registered configurations, validate feedback routing and clock distribution on the PCB because marginal clock edges or unsuitable routing can produce failures that resemble an incorrect fuse map.
Informations de conformité
No current RoHS, REACH, lead-free, halogen-free, or conflict-minerals declaration was identified for the exact GAL16V8B-25LP ordering code. AEC-Q100 is not applicable to this legacy commercial CPLD.
