Texas Instruments 5962-87671043A

Overview

TIBPAL20R4-20M from Texas Instruments is a high-performance military-grade 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 and defense control logic for state-machine initialization and I/O buffering.

For engineers reviewing the 5962-87671043A datasheet, 5962-87671043A pinout, 5962-87671043A application, or 5962-87671043A equivalent, this page delivers verified electrical specs, military temperature validation, registered output timing behavior, and LCCC package layout details essential for obsolescence-mitigated system redesigns.

Technical Context

The 5962-87671043A implements a fixed-architecture PAL with 40 × 64 AND-OR logic array, synchronous D-type registers on all four outputs, and active-low output enable (OE). Its register clock (CLK) and OE signals are fully specified for operation at 41.6 MHz max without feedback.

It supports asynchronous preload of each register to high or low states via dedicated control sequences, enabling deterministic test initialization. Power-up reset forces all Q outputs low regardless of input state, ensuring repeatable startup in safety-critical sequencers.

Key Specifications

Pinout & Package

LCCC (Leadless Chip Carrier), FD package, 28-pin ceramic, hermetically sealed, JESD-22 qualified for high-reliability applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar registered PAL applications.

Compared with 5962-87671043A, 5962-87671013A trades registered outputs for greater combinatorial flexibility, while 5962-8767102LA retains full register functionality but increases output count and changes package type - both require PCB-level evaluation for signal integrity and thermal management.

Availability

5962-87671043A is available at Aetrix Electronics and suitable for aerospace sequencing logic, defense radar timing control, avionics display interface, and missile guidance logic requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 5962-87671043A 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 company founded in 1930, specializing in analog, embedded processing, and high-reliability logic solutions for industrial, automotive, and defense markets.

The TIBPAL20R4 series belongs to TI's military-qualified IMPACT™ PAL family, designed specifically for replacing discrete TTL logic in radiation-tolerant, high-temperature, and long-lifecycle systems where programmability reduces board area and improves design iteration speed.

FAQ

What is the absolute maximum supply voltage for 5962-87671043A?

The absolute maximum supply voltage for 5962-87671043A is 7 V, as specified in the Absolute Maximum Ratings table. Operation above 5.5 V nominal violates recommended conditions and risks permanent damage. The device is rated for 4.5 V to 5.5 V operation, with 5 V being the typical target for MIL-STD-704A-compliant power supplies. Exceeding 7 V-even momentarily-may cause latch-up or junction breakdown in the Advanced Low-Power Schottky circuitry of the 5962-87671043A.

Does 5962-87671043A support in-system programming?

No, 5962-87671043A does not support in-system programming. It is a one-time programmable (OTP) device using titanium-tungsten fuses, requiring external UV-erasable or dedicated PAL programmers prior to soldering. Programming occurs off-board using standard industry tools like Data I/O PS-29 or BP Microsystems devices, with algorithms documented in TI's SRPS021A specification. The 5962-87671043A has no serial interface, JTAG port, or configuration memory - all logic patterns are permanently fused during initial programming.

What is the purpose of Pin 13 (OE) on 5962-87671043A?

Pin 13 on 5962-87671043A is the active-low Output Enable (OE) signal, which controls the 3-state behavior of all four registered outputs (Q1–Q4). When OE is high, outputs enter high-impedance (Hi-Z) mode; when OE is low, outputs drive valid logic levels. This enables bus sharing in multi-device systems and reduces contention during power-up or fault conditions. The 5962-87671043A datasheet specifies ten(OE→Q) = 10–20 ns and tdis(OE↑→Q) = 8–20 ns, confirming its use in time-critical arbitration schemes.

How does the power-up clear function behave on 5962-87671043A?

On 5962-87671043A, power-up clear forces all four registered outputs (Q1–Q4) to logic low immediately upon VCC crossing 1.5 V, provided the VCC ramp is monotonic. This reset occurs independently of CLK or OE state and lasts ~600 ns (typical), per Figure 2 in SRPS021A. It ensures deterministic initialization in safety-critical applications such as flight control sequencers. The 5962-87671043A does not assert any output high during this event - all Q pins go low, then remain low until first valid clock edge.

Can 5962-87671043A be used as a drop-in replacement for PAL20R4-20M?

No, 5962-87671043A is not a drop-in replacement for commercial PAL20R4-20M. While functionally identical in logic architecture, it differs in qualification level (MIL-PRF-38535 Class B vs. commercial), package (28-pin LCCC FD vs. 24-pin CDIP JT), marking, and screening. The 5962-87671043A requires PCB redesign due to different pin count, layout, and thermal pad requirements. Its use mandates compliance verification per applicable military standards - the 5962-87671043A is intended for new designs requiring certified high-reliability assurance, not retrofits.