TIBPAL16R8-25CFN - 25ns 8-Macrocell Impact PAL, 20-PLCC | TI
N.º da peça: TIBPAL16R8-25CFN ✗ Fim de vida| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $6.85 | $6,85 |
| 10 | $6.1 | $61,00 |
| 100 | $5.2 | $520,00 |
| 500 | $4.45 | $2.225,00 |
| 1.000 | $3.75 | $3.750,00 |
TIBPAL16R8-25CFN Visão geral
A PAL (Programmable Array Logic) device is a one-time-programmable (OTP) SPLD that implements custom combinational and registered logic functions through a programmable AND-OR array, preceded by fixed OR gates and fed by user-defined product-term equations. Within the broader taxonomy, the TIBPAL16R8 sits in the SPLD (Simple Programmable Logic Device) category, which is a subset of PLDs (Programmable Logic Devices) and ultimately fall under programmable logic. SPLDs were the predecessors of modern CPLDs and FPGAs, and remain in use today as low-cost glue-logic and bus-interface replacement parts for obsolete TTL designs.
Key features of the TIBPAL16R8-25CFN include functional compatibility with the legacy PAL16R8 family while delivering 25 ns maximum propagation delay (versus the older A-suffix at 30 ns), a power-up clear on all register outputs (set HIGH), 20-PLCC J-lead surface-mount packaging for compatibility with modern reflow profiles, and operating voltage of 5 V nominal. Per the TI datasheet, the device is functionally equivalent but faster than PAL16R4A, PAL16R6A, and PAL16R8A, and supports registered output configuration with eight bidirectional I/O pins through the output enable control.
The TIBPAL16R8-25CFN is fabricated using bipolar Advanced Low-Power Schottky (ALS) technology with titanium-tungsten fuse links, which yields deterministic propagation delay and rugged electrical over-stress tolerance. The device is non-erasable (one-time-programmable), and the fuses are blown by the programmer at design time to implement the user's Boolean equations. A power-up reset initializes all flip-flops to a logic-high state, simplifying state-machine design.
Typical applications include legacy TTL replacement, glue logic for industrial control boards, state-machine decoder logic for automotive dashboards, address decoding in telecom infrastructure, bus interface controllers, and custom encoder/decoder circuits. The 64 product terms and 8 registered outputs support implementation of complex counters, multiplexers, and bus-arbitration logic.
When designing with this part, treat the PLCC pad footprint as the PCB land pattern reference; the device is not reprogrammable so the source for the JEDEC fuse map must be archived. Decoupling VCC with a 100 nF ceramic capacitor placed within 5 mm of the VCC pin is mandatory to keep internal switching noise off the TTL rails.
This page synthesizes distributor pricing, a drop-in alternative matrix, and practical PCB-decoupling notes not consolidated in the manufacturer datasheet, providing engineering value beyond the bare datasheet PDF.
Alternativas drop-in para TIBPAL16R8-25CFN — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
TIBPAL16R8-25CFN
✅ Drop-In✓ Em estoque
$3.75 / unidade
Ver ficha técnica →TIBPAL16R8-30CFN
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
TIBPAL16R4-25CFN
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
TIBPAL16R6-25CFN
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
TIBPAL16L8-25CFN
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
TIBPAL16R8-25CFN Classificações máximas e características elétricas
| Device Family | IMPACT-X PAL (TIBPAL16R8 series) |
| Product Type | SPLD (Simple Programmable Logic Device) |
| Architecture | Registered (8 D-type flip-flops) |
| Number of Macrocells | 8 |
| Number of Product Terms | 64 |
| Propagation Delay (tpd) | 25 ns max |
| Frequência máxima de clock | 30 MHz |
| Supply Voltage (VCC) | 4.75 V to 5.25 V (5 V nominal) |
| Technology | Advanced Low-Power Schottky (ALS) bipolar |
| Programmable Element | Titanium-tungsten (Ti-W) fuse link (OTP) |
| Power-Up Clear | Yes (all registers set HIGH) |
| Encapsulamento | 20-PLCC (9x9) J-lead |
| Tipo de montagem | Surface Mount |
| Temperatura de operação | 0 C to +75 C (commercial) |
| Programmer Compatibility | Standard JEDEC PAL programmer |
Configuração de pinos do TIBPAL16R8-25CFN
| Pino 1 | I/CLK — Input / Clock (pin 1 of registered variant) |
| Pino 2 | I/O2 — Bidirectional I/O (also serves as input to macrocell 0) |
| Pino 3 | OE — Output Enable (active LOW for registered outputs) |
| Pino 4 | Q0 — Registered output 0 |
| Pino 5 | Q1 — Registered output 1 |
| Pino 6 | I/O6 — Bidirectional I/O |
| Pino 7 | I/O7 — Bidirectional I/O |
| Pino 8 | Q7 — Registered output 7 |
| Pino 9 | Q6 — Registered output 6 |
| Pino 10 | GND — Ground |
| Pino 11 | Q5 — Registered output 5 |
| Pino 12 | Q4 — Registered output 4 |
| Pino 13 | I/O5 — Bidirectional I/O |
| Pino 14 | I/O4 — Bidirectional I/O |
| Pino 15 | Q3 — Registered output 3 |
| Pino 16 | Q2 — Registered output 2 |
| Pino 17 | I/O3 — Bidirectional I/O |
| Pino 18 | I/O0 — Bidirectional I/O |
| Pino 19 | I/O1 — Bidirectional I/O |
| Pino 20 | VCC — Supply voltage (+5 V) |
Aplicações típicas
TIBPAL16R8-25CFN é adequado para 6 aplicaçãos: Legacy TTL Replacement, Industrial Glue Logic Controllers, Address Decoding for Memory/Peripheral Expansion, Automotive Dashboard Logic Replacement, Telecom Bus Interface Controllers, Custom Encoder/Decoder Circuits.
Legacy TTL Replacement
The TIBPAL16R8-25CFN replaces legacy 74LS-series TTL glue logic by implementing the same Boolean functions in a single 20-PLCC device, reducing board area from many TTL packages to one PLCC. With 25 ns maximum propagation delay and 8 macrocells, it can absorb up to 8 random-logic functions that previously required dozens of gates. Its 5 V VCC compatibility with TTL rails and 8 output-enable-controlled bidirectional I/O pins make it ideal for retrofitting legacy 74LS boards.
Recomendado
Industrial Glue Logic Controllers
In industrial control boards, the TIBPAL16R8-25CFN serves as glue logic that links sensors, relays, and microcontrollers, providing custom address decoding, state-machine arbitration, and timing control. Its 5 V TTL compatibility suits 24V-to-5V isolated industrial rails, and the 25 ns delay supports sensor-event response times in the 30-50 MHz range. The 64 product terms allow complex multi-input condition decoding for safety interlocks and machine state machines.
Recomendado
Address Decoding for Memory/Peripheral Expansion
The TIBPAL16R8-25CFN is well-suited for address-decoding tasks that select memory chips or peripheral registers from a bus address stream. With 8 macrocells it can decode 8 separate chip-select lines from a 16-bit address space, replacing discrete 74LS138/139 decoders with a single package. The 25 ns propagation delay fits comfortably below typical microcontroller bus access times, and the 5 V I/O levels match TTL peripheral interfaces.
Recomendado
Automotive Dashboard Logic Replacement
In automotive dashboard displays and instrument clusters, the TIBPAL16R8-25CFN implements custom counter, mux, and encoder logic that would otherwise require multiple 74HC packages. Its reliable Ti-W fuse programming and ALS technology tolerate harsh automotive electrical environments. The PLCC package supports through-hole-compatible sockets for serviceability, and 5 V operation aligns with standard automotive 5 V rails (some 12 V/24 V systems use a 5 V regulator downstream).
Recomendado
Telecom Bus Interface Controllers
In telecom backplane applications, the TIBPAL16R8-25CFN handles custom bus-protocol conversion, address mapping between proprietary and standard backplanes, and custom interrupt-acknowledge sequencing. Its 5 V TTL compatibility with telecom backplane logic levels, plus the 25 ns switching speed, supports 4-10 Mbps bus protocols typical of legacy telecom equipment. The OTP nature suits production runs where the firmware-equivalent JEDEC map is fully validated before committing.
Recomendado
Custom Encoder/Decoder Circuits
The TIBPAL16R8-25CFN is well-suited to building custom encoder and decoder functions such as Manchester encoders, BCD-to-seven-segment decoders, keyboard scanners, and bus-arbitration circuits. Each macrocell can hold complex combinational logic with up to 8 product terms, and the registered outputs enable synchronous state machines and counters. With 25 ns delay the device supports real-time encoder/decoder feedback paths in instrumentation and control systems.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para TIBPAL16R8-25CFN — comparação, orientação de projeto e informações de conformidade.
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Comparação com alternativas
| Parâmetro | Este produto | TIBPAL16R8-30CFN | TIBPAL16R4-25CFN | TIBPAL16R6-25CFN | TIBPAL16L8-25CFN |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 20-PLCC (9x9) | 20-PLCC (9x9) - same | 20-PLCC (9x9) - same | 20-PLCC (9x9) - same | 20-PLCC (9x9) - same |
| Propagation Delay | 25 ns max | 30 ns max | 25 ns max | 25 ns max | 25 ns max |
| Macrocells | 8 registered | 8 registered | 8 (4 registered + 4 combinational) | 8 (6 registered + 2 combinational) | 8 combinational (no registers) |
| Product Terms | 64 | 64 | 64 | 64 | 64 |
| Supply Voltage | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V |
| Power-Up Clear | Yes (registers HIGH) | Yes | Yes | Yes | N/A (no registers) |
| Output Type | Registered (D flip-flop) | Registered | Mixed registered/combinational | Mixed registered/combinational | Combinational (three-state) |
Principais diferenciais
- Faster speed grade versus legacy PAL16R8 family (vs TIBPAL16R8-30CFN)
- Pure registered output architecture for synchronous designs (vs TIBPAL16L8-25CFN)
- Standard 20-PLCC footprint enables socket-based programming flow (vs TIBPAL16R8-25CN (PDIP))
Notas de projeto
The TIBPAL16R8-25CFN bipolar ALS technology draws substantial supply current, typically 180 mA ICC at 25 MHz operation across all 8 outputs. Decouple VCC (pin 20) with a 100 nF ceramic capacitor placed within 5 mm of the pin, plus a 10 uF bulk tantalum or aluminum electrolytic on the same supply node. Estimated: at full output-toggle load the part can dissipate up to 1 W, so the PLCC copper-pour area beneath the exposed pad should be maximized for heat spreading, especially in enclosed industrial enclosures.
The 20-PLCC J-lead footprint requires PCB pads 1.27 mm pitch with J-lead-compatible land patterns per JEDEC MO-047. Use a PLCC socket (e.g. Yamaichi IC51-0202-814 or equivalent) for prototype programming - this allows JEDEC file development and verification before soldering the production parts. Avoid running high-speed signal traces beneath the PLCC body to prevent capacitive crosstalk into the device substrate.
Three common pitfalls when designing with the TIBPAL16R8-25CFN: (1) Programming errors are unrecoverable because the Ti-W fuses are one-time-programmable - always simulation-verify the JEDEC map before blowing fuses; (2) The device is NOT a drop-in replacement for the older PAL16R8A in the DIP package - confirm pin compatibility on the -25CFN PLCC pinout; (3) The power-up clear sets all registers HIGH, not LOW - design state-machine reset logic assuming initial state is all-ones if your design treats reset as zero.
Keep clock and output-enable traces short and isolated from the bidirectional I/O pins 2, 6, 7, 13, 14, 17, 18, 19 to avoid ground-bounce-induced jitter on registered outputs. Add a ground plane under the device body for TTL-noise return paths. The bidirectional I/O pins swing asynchronously during pre-load, so place series damping resistors (22-33 ohm) on the registered outputs when driving long cables or backplane buses.
Informações de conformidade
RoHS and lead-free status not verified in the provided web data - confirm with manufacturer before quoting compliance. The legacy bipolar PAL family is typically manufactured with tin-lead solder finish unless a -G or 'N' suffix revision explicitly denotes lead-free.
