Texas Instruments 84099012A

Overview

84099012A from Texas Instruments is an octal D-type flip-flop with active-low asynchronous clear, designed for synchronous data latching in digital logic systems. It operates across 2 V to 6 V, delivers ±4 mA output drive at 5 V, exhibits typical propagation delay of 12 ns, and supports clock frequencies up to 25 MHz at 6 V - used in buffer registers and pattern generation circuits.

For engineers reviewing the 84099012A datasheet, 84099012A pinout, 84099012A application, or 84099012A equivalent, key selection criteria include its 20-pin LCCC package, -55°C to +125°C military-grade temperature range, direct-clear functionality, and compatibility with HC logic families in high-reliability embedded control and test equipment.

Technical Context

The 84099012A implements eight independent positive-edge-triggered D flip-flops sharing a common clock (CLK) and a global active-low clear (CLR) input. Each flip-flop captures data from its dedicated D input on the rising edge of CLK and holds the state until the next valid clock edge or CLR assertion.

It uses silicon-gate CMOS technology, enabling low static current (≤80 µA ICC), high noise immunity (VIH ≥3.15 V at VCC = 4.5 V), and rail-to-rail output swing. Its design targets deterministic timing behavior with setup time as low as 21 ns and hold time of 0 ns at 6 V, supporting stable operation in synchronous state machines.

Key Specifications

Pinout & Package

84099012A is housed in a 20-pin Ceramic Leadless Chip Carrier (LCCC, FK package) with 8.89 mm × 8.89 mm body size and hermetic sealing suitable for harsh environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN54HC273J and SN74HC273PW, 84099012A offers unique value in hermetic LCCC packaging, extended temperature qualification, and compliance with MIL-PRF-38535 - making it the only option among the three for deployed aerospace and defense systems requiring long-term reliability under thermal and mechanical stress.

Availability

84099012A is available at Aetrix Electronics and suitable for avionics data capture, engine control sequencing, and military-grade test equipment requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 84099012A 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 logic solutions for industrial, automotive, and aerospace markets.

The 84099012A belongs to TI's SN54HC logic family, engineered specifically for high-reliability military and space applications where extended temperature operation, hermetic packaging, and MIL-PRF-38535 compliance are mandatory.

FAQ

What is the operating temperature range of the 84099012A?

The 84099012A is specified for operation from –55°C to +125°C, meeting MIL-PRF-38535 Class B requirements. This extended range enables deployment in jet engine compartments, satellite payload bays, and ground vehicle control units exposed to extreme ambient conditions. The LCCC package contributes to thermal stability through low junction-to-case resistance (31.1°C/W).

Does the 84099012A support 3.3 V logic systems?

Yes, the 84099012A operates reliably at 3.3 V supply. Its VIH threshold is 2.31 V (min) and VIL is 1.09 V (max) at VCC = 3.3 V, providing adequate noise margin for interfacing with 3.3 V microcontrollers and FPGAs. Input and output levels remain compatible with both 3.3 V and 5 V HC-family devices.

Is the 84099012A pin-compatible with other SN54HC273 variants?

Yes, the 84099012A shares identical pinout and electrical functionality with all SN54HC273 variants including SN54HC273J and SN54HC273W. All use the same 20-pin configuration with matching signal assignments (e.g., Pin 1 = CLR, Pin 11 = CLK, Pin 20 = VCC), enabling drop-in replacement across package types when board layout permits.

What is the maximum clock frequency supported by the 84099012A at 5 V?

At VCC = 5 V, the 84099012A supports a maximum clock frequency of 21 MHz (per SN54HC273 timing specs). This is derived from tpd(max) = 40 ns and minimum CLK high/low pulse width of 20 ns - ensuring reliable edge-triggered operation in real-time control loops and digital signal acquisition systems.

How does the clear function behave in the 84099012A?

The 84099012A features an asynchronous active-low clear (CLR) input. When asserted, it forces all eight Q outputs low immediately - independent of clock timing. Propagation delay from CLR to any Q is ≤40 ns at 6 V. Release of CLR restores normal clocked operation on the next rising CLK edge, with no metastability risk.