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Texas Instruments TIBPAL20R4-20MJTB
- Part No.:
- TIBPAL20R4-20MJTB
- Manufacturer:
- Texas Instruments
- Category:
- PLDs (Programmable Logic Device)
- Package:
- -
- Datasheet:
-
TIBPAL20R4-20MJTB.pdf
- Description:
- TIBPAL20R4-20M HIGH-PERFORMANCE
- Quantity:
- Payment:
- Shipping:
Inventory:132
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Product details
Overview
TIBPAL20R4-20MJTB from Texas Instruments is a military-grade registered programmable array logic (PAL) device with 12 inputs, 4 registered 3-state outputs, and a maximum clock frequency of 41.6 MHz. It features power-up clear, asynchronous preload capability, and operates across −55°C to 125°C. Used in legacy aerospace, defense, and industrial control systems for custom synchronous logic implementation.
For engineers reviewing the TIBPAL20R4-20MJTB datasheet, TIBPAL20R4-20MJTB pinout, TIBPAL20R4-20MJTB application, or TIBPAL20R4-20MJTB equivalent, key selection considerations include its 24-pin CDIP package, military temperature rating, registered output timing behavior, and compatibility with standard PAL programming tools and fuse-based configuration workflows.
Technical Context
This device implements a fixed-architecture 20-pin universal PAL with 4 registered outputs driven by a common clock (Pin 1) and output enable (Pin 13). Its logic plane consists of a 40 × 64 programmable AND array feeding D-type flip-flops with synchronous reset and asynchronous preload.
It supports TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V), delivers ±12 mA output drive, and exhibits propagation delays as low as 8 ns (CLK→Q) under military conditions. The device requires external programming voltage (VIHH = 10.25–10.75 V) applied to Pin 13 during preload operations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Type | Registered PAL with 4 synchronous 3-state outputs and 12 dedicated inputs |
| Max Clock Frequency | 41.6 MHz without feedback - sets upper limit for synchronous state-machine operation |
| Operating Temperature | −55°C to 125°C - qualified for extended military and harsh-environment applications |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V TTL systems with margin for rail variation |
| Propagation Delay | 8–15 ns (CLK→Q) - determines minimum clock period and setup/hold timing margins |
| Output Drive | IOL = 12 mA, IOH = −2 mA - sufficient to directly drive multiple TTL loads without buffers |
| Power Consumption | ICC ≤ 180 mA - defines thermal budget in dense logic assemblies; no dynamic power spec given |
Pinout & Package
Package: 24-pin ceramic dual in-line package (CDIP, JT suffix), hermetically sealed, leaded SNPB finish, non-RoHS compliant, rated for −55°C to 125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLK | Positive-edge-triggered clock input controlling all 4 register outputs |
| 2–12 | I | Dedicated input pins (11 total); no internal feedback paths per datasheet diagram |
| 13 | OE | Active-low output enable controlling 3-state behavior of all Q outputs |
| 14 | GND | Ground reference for logic and power return |
| 15–18 | Q | Registered 3-state outputs (Q1–Q4); each individually pre-loadable and power-up cleared |
| 19–22 | I/O | Not applicable - TIBPAL20R4 has zero bidirectional I/O ports (unlike R6/R8 variants) |
| 23 | VCC | +5 V supply pin; decoupling required per MIL-STD-1399 guidelines |
| 24 | NC | No internal connection - must be left unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Power-Up Clear | All Q outputs reset to logic low at power-on, simplifying state-machine initialization without external reset circuitry |
| Asynchronous Preload | Each Q output can be forced to high or low via Pin 13 and data on corresponding Q pin - enables deterministic test-state entry |
| Military Temperature Range | Qualified from −55°C to 125°C per MIL-PRF-38535, supporting deployment in avionics and ground vehicle ECUs |
| Programmable Logic Density | 40 × 64 fused-AND array provides up to 64 product terms per macrocell - sufficient for medium-complexity combinatorial+sequential functions |
| TTL-Compatible Interface | Meets standard TTL VIH/VIL, VOH/VOL, and drive specs - interoperable with legacy 74LS/AS logic families |
Applications
| Avionics Control Logic | Secure Communication Module |
|---|---|
|
Use Scenario: Implementing deterministic, radiation-tolerant sequencing logic in flight control interface units. IC Role / Device Role / Timing Role: Synchronous state register managing discrete actuator enable signals with guaranteed power-on reset. Use Value: Eliminates need for external reset supervisors and reduces BOM count while ensuring repeatable startup behavior across thermal extremes. |
Use Scenario: Configurable protocol translation between legacy MIL-STD-1553 bus controllers and modern FPGA-based crypto engines. IC Role / Device Role / Timing Role: Registered glue logic synchronizing handshaking signals and buffering command/status words. Use Value: Provides precise setup/hold timing control (tsu = 20 ns) for reliable data capture across voltage and temperature variations. |
| Industrial PLC Backplane | Test Equipment Pattern Generator |
|
Use Scenario: Address decoding and I/O multiplexing in ruggedized programmable logic controller backplanes. IC Role / Device Role / Timing Role: Registered output driver enabling hot-swap-safe enable/disable of peripheral modules via OE-controlled 3-state outputs. Use Value: Prevents bus contention during module insertion/removal using fast disable time (tdis = 8–20 ns) and robust 12 mA sink capability. |
Use Scenario: Generating repeatable stimulus waveforms for production testing of digital subsystems in defense electronics. IC Role / Device Role / Timing Role: Preloaded register bank producing known-good test vectors synchronized to system clock. Use Value: Enables rapid test-state initialization (via Pin 13 preload) without stepping through full state sequences - cuts test cycle time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar registered PAL applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JM38510/50501BLA | MIL-PRF-38535 Class B qualified; identical pinout, timing, and logic architecture; same CDIP-24 package | Same military application scope; differs only in part numbering convention and procurement channel (DSCC vs TI branded) | Select when DSCC-qualified sourcing or DoD contract compliance is mandatory |
| TIBPAL20R4-20MFDB | LCCC-28 ceramic package instead of CDIP-24; identical electrical specs and functionality; different pin mapping | Suitable for surface-mount board designs requiring higher I/O density and improved thermal performance | Select when PCB layout uses LCCC footprints or requires enhanced vibration resistance |
Compared with JM38510/50501BLA and TIBPAL20R4-20MFDB, the TIBPAL20R4-20MJTB offers identical logic functionality and military temperature operation but is uniquely optimized for through-hole CDIP assembly, legacy repair programs, and systems where JEDEC-standard pinout and mechanical form factor are required.
Availability
TIBPAL20R4-20MJTB is available at Aetrix Electronics and suitable for avionics control logic, secure communication modules, and industrial PLC backplane designs requiring stable component supply over extended product lifecycles.
Supply support for TIBPAL20R4-20MJTB 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
Texas Instruments is a U.S.-based semiconductor manufacturer founded in 1930, specializing in analog, embedded processing, and legacy logic solutions with deep heritage in military and aerospace components.
The TIBPAL20R4 series belongs to TI's IMPACT™ PAL family, designed specifically for high-reliability, field-programmable logic replacement in systems where ASIC development is cost-prohibitive and TTL glue logic is too inflexible.
FAQ
What is the maximum clock frequency supported by the TIBPAL20R4-20MJTB?
The TIBPAL20R4-20MJTB supports a maximum clock frequency of 41.6 MHz without feedback, as specified in the switching characteristics table for the M-suffix military series. This value is measured under recommended operating conditions (VCC = 5 V, TA = 25°C) and represents the highest guaranteed toggle rate for synchronous register operation in the TIBPAL20R4-20MJTB.
Does the TIBPAL20R4-20MJTB require external programming hardware?
Yes, the TIBPAL20R4-20MJTB requires external programming hardware capable of delivering VIHH = 10.25–10.75 V to Pin 13 during fuse programming or preload operations. Standard industry programmers supporting TI PAL devices - such as Data I/O PS-20 or BP Microsystems Model 2000 - are compatible with the TIBPAL20R4-20MJTB.
How does the power-up clear function behave on the TIBPAL20R4-20MJTB?
On the TIBPAL20R4-20MJTB, all four registered outputs (Q1–Q4) are asynchronously forced low following power application, provided VCC rise is monotonic. This occurs independently of clock or enable states and ensures deterministic initial conditions for state machines - a core design feature confirmed in Figure 2 and Section 14 of the SRPS021A datasheet.
Can the TIBPAL20R4-20MJTB be used in place of the commercial-grade TIBPAL20R4-15C?
No - the TIBPAL20R4-20MJTB is not a drop-in replacement for the TIBPAL20R4-15C due to differences in temperature range (−55°C to 125°C vs 0°C to 75°C), timing specifications (41.6 MHz vs 45 MHz max), and supply voltage tolerance (4.5–5.5 V vs 4.75–5.25 V). While functionally identical, the TIBPAL20R4-20MJTB must be validated separately for commercial applications.
What is the purpose of Pin 24 on the TIBPAL20R4-20MJTB?
Pin 24 on the TIBPAL20R4-20MJTB is designated NC (No Connection) and contains no internal bond wire or circuit connection. Per the official Texas Instruments datasheet (SRPS021A, page 6), this pin must remain unconnected in all PCB layouts to avoid unintended coupling or mechanical stress - a requirement strictly enforced in MIL-STD-883 screening.
TIBPAL20R4-20MJTB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Programmable Type:
- -
- Number of Macrocells:
- -
- Voltage - Input:
- -
- Speed:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
TIBPAL20R4-20MJTB FAQ
1.How can I place an order for TIBPAL20R4-20MJTB through Aetrix?
Please submit a Request for Quotation (RFQ) for TIBPAL20R4-20MJTB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TIBPAL20R4-20MJTB reliable?
The price and inventory of TIBPAL20R4-20MJTB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TIBPAL20R4-20MJTB is usually 5 days.
3.What payment methods are accepted for TIBPAL20R4-20MJTB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TIBPAL20R4-20MJTB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TIBPAL20R4-20MJTB?
TIBPAL20R4-20MJTB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TIBPAL20R4-20MJTB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TIBPAL20R4-20MJTB?
For technical support, including TIBPAL20R4-20MJTB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TIBPAL20R4-20MJTB requirements.
6.How does Aetrix verify that TIBPAL20R4-20MJTB is sourced from the original manufacturer or authorized distributors?
All TIBPAL20R4-20MJTB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TIBPAL20R4-20MJTB meets industry standards.
7.What is the process for return or replacement of TIBPAL20R4-20MJTB?
All TIBPAL20R4-20MJTB units undergo pre-shipment inspection (PSI). If there is an issue with TIBPAL20R4-20MJTB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TIBPAL20R4-20MJTB part is unused and in its original packaging.
Return procedure for TIBPAL20R4-20MJTB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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