Texas Instruments CD74HC173PW

Overview

CD74HC173PW from Texas Instruments is a high-speed CMOS quad D-type flip-flop with three-state outputs, shared clock (CP), master reset (MR), and dual data enable (E1/E2) and output enable (OE1/OE2) controls. It operates from 2 V to 6 V, delivers 15 LSTTL load drive capability, and supports –55°C to +125°C industrial/military temperature range - used in synchronous bus interface and data latching applications.

For engineers reviewing the CD74HC173PW datasheet, CD74HC173PW pinout, CD74HC173PW application, or CD74HC173PW equivalent, this page provides verified functional identity, TSSOP-16 package mapping, propagation delay (tpd ≤ 43 ns at VCC = 6 V), three-state leakage (IOZ ≤ ±10 µA), and direct substitution guidance against CD74HCT173PW and SN74HC173PWR.

Technical Context

The CD74HC173PW implements four edge-triggered D-type flip-flops sharing CP, MR, E1, E2, OE1, and OE2 control lines. Its synchronous positive-edge clocking and asynchronous active-high master reset enable deterministic state capture and global initialization in bus-oriented systems.

Three-state outputs are independently controlled by OE1 and OE2: either high disables all Q outputs to high-impedance, preserving bus integrity. Input enables E1/E2 gate data flow - when asserted high, they force feedback from Q to D, holding current state without clock interruption.

Key Specifications

Pinout & Package

TSSOP-16 package (PW), body size 5.00 mm × 4.40 mm, 1.2 mm max height, moisture sensitivity level 1 (260°C reflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad D-type flip-flop with three-state applications.

Compared with CD74HC173PW, CD74HCT173PW adds TTL input compatibility at the cost of narrower supply range, while SN74HC173PWR offers identical functionality with updated packaging and active production status - making it the recommended long-term sourcing option for new designs.

Availability

CD74HC173PW is available at Aetrix Electronics and suitable for industrial bus interface, test equipment data capture, military avionics control, and legacy system emulation requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for CD74HC173PW 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 logic solutions, with decades of heritage in high-reliability logic families.

The CD74HC173PW belongs to TI's CDx4HC logic series - designed for robust, low-power, wide-temperature digital interfacing in industrial, aerospace, and defense systems where signal integrity and long-term availability are critical.

FAQ

What is the supply voltage range supported by the CD74HC173PW?

The CD74HC173PW operates from 2 V to 6 V DC. This wide range allows interoperability between 3.3 V and 5 V logic domains without level shifters. At VCC = 2 V, propagation delay increases to 250 ns (max), while at VCC = 6 V, it achieves 43 ns (max) - enabling design flexibility across power-constrained and performance-critical applications. The CD74HC173PW does not support 1.8 V operation.

Does the CD74HC173PW have true TTL-compatible inputs?

No, the CD74HC173PW uses standard CMOS input thresholds (VIH = 1.5 V min at VCC = 2 V, 4.2 V min at VCC = 6 V), not TTL-compatible levels. For TTL input compatibility, use the pin-compatible CD74HCT173PW, which specifies VIH ≥ 2 V and VIL ≤ 0.8 V at VCC = 4.5–5.5 V. The CD74HC173PW is intended for CMOS-system integration, not direct replacement of 74LS-series devices without voltage translation.

How do the E1 and E2 pins function in the CD74HC173PW?

E1 and E2 are active-low data enable inputs. When both are low, D inputs pass through to the flip-flop inputs on the next CP rising edge. If either E1 or E2 is high, the corresponding Q output is fed back to its D input, holding the current state - allowing state retention without clock activity. This feature enables glitch-free hold modes during bus arbitration or power management events in the CD74HC173PW.

What is the maximum clock frequency for the CD74HC173PW at 5 V supply?

At VCC = 5 V and TA = 25°C, the CD74HC173PW supports a maximum clock frequency (fMAX) of 60 MHz. Over the full operating temperature range (–55°C to +125°C), fMAX decreases to 24 MHz at VCC = 4.5 V and 20 MHz at VCC = 6 V due to increased propagation delay. These values assume CL = 50 pF and input rise/fall times ≤ 400 ns (VCC = 6 V), per TI's switching characteristics test conditions for the CD74HC173PW.

Is the CD74HC173PW pin-compatible with the SN74HC173PWR?

Yes, the CD74HC173PW and SN74HC173PWR share identical TSSOP-16 pinout, electrical specifications, and functional behavior. They differ only in part numbering convention (CD vs. SN prefix), marking ("HJ173" vs. "HC173"), and production status - SN74HC173PWR is actively produced with standard tape-and-reel packaging (2000 pcs/reel), whereas CD74HC173PW is marked obsolete in TI's packaging addendum. For new designs, SN74HC173PWR is the recommended replacement for CD74HC173PW.