Texas Instruments 84136012A

Overview

84136012A from Texas Instruments is a military-grade octal D-type positive-edge-triggered flip-flop with asynchronous clear, implemented in ALS TTL logic. It features eight independent D inputs, single-rail Q outputs, buffered clock and direct-clear inputs, and operates across –55°C to 125°C. It is used in buffer/storage registers and pattern generators requiring deterministic edge-triggered storage under harsh environmental conditions.

For engineers reviewing the 84136012A datasheet, 84136012A pinout, 84136012A application, or 84136012A equivalent, key selection considerations include its LCCC FK package, 30 MHz maximum clock frequency, 24 mA low-level output drive, –55°C to 125°C operating range, and compatibility with legacy 5-V TTL systems requiring high-reliability timing control.

Technical Context

The 84136012A implements eight identical D-type latches synchronized to the rising edge of CLK, with asynchronous active-low CLR overriding clocked behavior. Data at each D input transfers to the corresponding Q output only on CLK's positive transition, provided setup (10 ns) and hold (0 ns) times are met.

It uses bipolar ALS (Advanced Low-Power Schottky) TTL technology, delivering 24 mA sink current per output while maintaining 30 MHz operation and low power consumption (ICCL = 29 mA max). Input thresholds are VIH ≥ 2 V and VIL ≤ 0.8 V, ensuring robust noise immunity in mixed-signal industrial environments.

Key Specifications

Pinout & Package

84136012A is supplied in a 20-pin ceramic LCCC (Leadless Chip Carrier) package with FK drawing, hermetically sealed for high-reliability applications. The package has no leads; connections are made via solderable metallized pads on the perimeter.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal D-type flip-flop applications.

Compared with SNJ54ALS273J and SNJ54ALS273W, 84136012A offers superior hermetic sealing and thermal cycling performance due to its LCCC FK construction - critical for extended-life deployments in vacuum or corrosive atmospheres where package integrity directly impacts MTBF.

Availability

84136012A is available at Aetrix Electronics and suitable for aerospace avionics, defense electronics, and downhole instrumentation requiring stable component supply, long-lifecycle assurance, and certified military-grade traceability.

Supply support for 84136012A 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 SN54ALS273 product line was designed for military and aerospace systems requiring robust, high-speed TTL-compatible storage elements with guaranteed operation across extreme temperatures and radiation environments.

FAQ

What is the maximum clock frequency supported by the 84136012A?

The 84136012A supports a maximum clock frequency of 30 MHz across its full operating temperature range of –55°C to 125°C. This rating is verified under recommended conditions (VCC = 4.5 V to 5.5 V, CL = 50 pF), and applies specifically to the LCCC FK package variant. Exceeding this frequency risks setup/hold violations and metastability in the 84136012A.

Does the 84136012A have complementary Q and Q̅ outputs?

No, the 84136012A provides only single-rail Q outputs (pins 2–9 are D inputs; pins 11–18 are Q outputs). It does not include true Q̅ (inverted) outputs on dedicated pins. If inverted logic is required, external inverters or cross-coupled gates must be used. This design choice reduces pin count and simplifies routing in the 84136012A's LCCC package.

Is the 84136012A RoHS compliant?

The 84136012A is not RoHS compliant, as it is a military-grade LCCC device with post-plated lead finish and no halogen-free or Pb-free designation in TI's packaging documentation. Its qualification focuses on MIL-STD-883 reliability and hermeticity-not commercial environmental directives. For RoHS-compliant alternatives, consider commercial-grade SOIC variants like SN74ALS273DW.

Can the 84136012A be operated at 3.3 V?

No, the 84136012A is specified only for 4.5 V to 5.5 V supply operation. ALS TTL logic thresholds and internal transistor biasing require ≥4.5 V for guaranteed VIH recognition and VOL compliance. Operating the 84136012A at 3.3 V will result in undefined logic states, excessive propagation delay, and potential failure to toggle - it is incompatible with 3.3-V systems.

What is the purpose of the buffered CLK and CLR inputs in the 84136012A?

The buffered CLK and CLR inputs in the 84136012A reduce input capacitance and increase fanout capability, allowing a single clock or clear signal to drive multiple 84136012A devices without signal degradation. This buffering prevents timing skew and ensures simultaneous, clean edge transitions across all eight flip-flops - essential for deterministic behavior in the 84136012A's target applications.