Texas Instruments CD54HC597F3A

Overview

CD54HC597F3A from Texas Instruments is a high-speed CMOS 8-bit parallel-in/serial-out shift register with input storage, featuring asynchronous parallel load, master reset, and dual-clock operation (STCP for storage, SHCP for shifting). It operates from 2V to 6V, supports -55°C to +125°C, and delivers 30 ns propagation delay (at VCC = 4.5V, CL = 50 pF) in military-grade CERDIP packaging. It is used in radiation-tolerant telemetry interfaces and ruggedized data acquisition systems requiring deterministic timing and wide-temperature reliability.

For engineers reviewing the CD54HC597F3A datasheet, CD54HC597F3A pinout, CD54HC597F3A application, or CD54HC597F3A equivalent, key selection criteria include its dual-clock architecture (STCP/SHCP), guaranteed operation across full military temperature range, CERDIP hermetic package, and compatibility with LSTTL-level inputs when used in HC mode with appropriate VCC.

Technical Context

The CD54HC597F3A implements two synchronized but independently clocked register stages: an 8-bit input storage register (edge-triggered by STCP) and an 8-bit shift register (clocked by SHCP). Parallel data is loaded asynchronously via PL low, while MR low clears the shift register. This architecture enables precise staging of parallel capture and serial streaming without bus contention.

It uses silicon-gate CMOS technology with buffered inputs, delivering high noise immunity (NIL/NIH = 30% of VCC at 5V) and fanout of 10 LSTTL loads. Its 2V–6V supply range and -55°C to +125°C operation make it suitable for avionics, missile guidance, and space-qualified subsystems where voltage margin and thermal resilience are critical.

Key Specifications

Pinout & Package

CD54HC597F3A is supplied in a 16-lead CERDIP (Ceramic Dual In-line Package) with hermetic sealing and SNPB lead finish, rated for military temperature operation and compatible with wave soldering (300°C, 10 s).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit parallel-in/serial-out shift register applications.

Compared with CD74HC597E and CD74HCT597M, CD54HC597F3A uniquely combines hermetic CERDIP packaging, guaranteed 2V–6V operation, and full MIL-PRF-38535 qualification - making it the sole option for new designs requiring radiation-hardened, vacuum-compatible, and thermally extreme deployment.

Availability

CD54HC597F3A is available at Aetrix Electronics and suitable for avionics data acquisition, missile guidance interface, and spacecraft telemetry encoder applications requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for CD54HC597F3A 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 global semiconductor leader specializing in analog, embedded processing, and high-reliability components, with decades of heritage in military and aerospace IC development.

The CD54HC597F3A belongs to TI's military-grade HC logic family, designed specifically for high-integrity digital signal conditioning in defense, space, and critical infrastructure systems where failure is not an option.

FAQ

What is the maximum clock frequency supported by CD54HC597F3A at 5V supply?

At VCC = 4.5V, the CD54HC597F3A supports a maximum SHCP frequency of 25 MHz over the full -55°C to +125°C range. At 25°C, the limit rises to 30 MHz. These values are verified per the switching specifications table in the SCHS191C datasheet and reflect worst-case process/voltage/temperature corners.

Does CD54HC597F3A require external pull-up resistors on its control inputs?

No, CD54HC597F3A does not require external pull-ups on PL, MR, STCP, or SHCP. Its CMOS inputs have leakage current ≤ ±1 µA over temperature, and internal structure ensures defined logic states with clean CMOS-level drive. External pull-ups are only needed if interfacing with open-drain sources or long unterminated traces susceptible to noise coupling.

Can CD54HC597F3A operate reliably at 3.3V supply voltage?

Yes, CD54HC597F3A is fully specified for 2V to 6V operation. At VCC = 3.3V, VIH = 2.31V (70% of VCC) and VIL = 0.99V (30% of VCC) provide adequate noise margins, and propagation delay remains ≤ 53 ns (SHCP→Q7, CL = 50 pF), enabling robust integration into mixed-voltage 3.3V/5V systems.

What is the meaning of "F3A" in CD54HC597F3A?

The "F3A" suffix denotes Texas Instruments' military-grade CERDIP package variant: "F" indicates ceramic DIP, "3" specifies lead finish (SNPB), and "A" identifies the revision level per MIL-PRF-38535. This suffix confirms compliance with Class B screening, including burn-in, temperature cycling, and hermeticity testing.

How does the asynchronous parallel load (PL) interact with ongoing shift operations?

When PL is driven low, CD54HC597F3A immediately transfers the contents of the input storage register into the shift register - overriding any active SHCP activity. This occurs asynchronously, independent of clock edges, ensuring deterministic data staging even mid-shift. The shift register then outputs the newly loaded data starting with the next SHCP rising edge.