Texas Instruments SN74AHC273PWRG4

Overview

SN74AHC273PWRG4 from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with asynchronous clear, operating from 2 V to 5.5 V, featuring eight independent data inputs and single-rail outputs, used for synchronous data latching in digital logic systems such as memory registers and pattern generation circuits.

For engineers reviewing the SN74AHC273PWRG4 datasheet, SN74AHC273PWRG4 pinout, SN74AHC273PWRG4 application, or SN74AHC273PWRG4 equivalent, key selection criteria include its 20-pin TSSOP package, 5.5-V tolerant inputs enabling 5 V-to-3.3 V level translation, ±25 mA output drive capability, and guaranteed timing performance at both 3.3 V and 5 V supply rails.

Technical Context

This device implements eight independent D-type latches triggered on the rising edge of CLK, with a dedicated active-low asynchronous CLR input that forces all Q outputs low regardless of clock state. Each D input drives one corresponding Q output, and no internal feedback or bus-hold circuitry is present.

Input voltage tolerance up to 5.5 V allows interfacing with legacy 5 V logic while powered from 3.3 V, and propagation delays are specified down to 5.2 ns (tPHL, VCC = 5 V, CL = 15 pF), supporting clock frequencies up to 100 MHz under typical conditions.

Key Specifications

Pinout & Package

The SN74AHC273PWRG4 is housed in a 20-pin TSSOP (PW) package measuring 6.50 mm × 6.4 mm with body size 6.50 mm × 4.40 mm, optimized for space-constrained PCB layouts and compatible with standard surface-mount reflow processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC273PWR, SN74AHC273PWRG4 supports broader voltage interoperability and 5 V legacy compatibility; compared with 74AHC273PW,118, it offers identical electrical behavior but distinct TI-specific qualification and documentation traceability.

Availability

SN74AHC273PWRG4 is available at Aetrix Electronics and suitable for memory register, pattern generator, server I/O buffer, and network switch control logic applications requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for SN74AHC273PWRG4 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 ICs, with decades of experience in high-reliability logic families and industrial-grade qualification.

The SN74AHC273PWRG4 belongs to the AHC logic family designed for low-power, high-speed CMOS operation across wide voltage ranges, targeting industrial, computing, and communications infrastructure where robustness and interoperability are essential.

FAQ

What is the maximum clock frequency supported by SN74AHC273PWRG4?

The SN74AHC273PWRG4 supports up to 100 MHz maximum clock frequency when operated at VCC = 5 V with 50 pF load capacitance, as specified in the switching characteristics table. At 3.3 V, the maximum frequency drops to 65 MHz under the same load condition. These values are measured at TA = 25 °C and assume proper signal integrity and decoupling.

Does SN74AHC273PWRG4 support 5 V logic inputs while powered from 3.3 V?

Yes, SN74AHC273PWRG4 features 5.5-V tolerant inputs, allowing it to accept 5 V logic signals even when VCC is supplied at 3.3 V. This enables seamless down-translation in mixed-voltage systems without external level shifters, as confirmed in Section 7.1 and Table 5.3 of the datasheet.

What is the purpose of the CLR pin on SN74AHC273PWRG4?

The CLR pin on SN74AHC273PWRG4 is an active-low asynchronous clear input that forces all eight Q outputs to logic low immediately, independent of the clock signal. This function is essential for system initialization, error recovery, and deterministic state reset in applications like memory registers and control logic.

Can SN74AHC273PWRG4 be used in automotive under-hood applications?

SN74AHC273PWRG4 is rated for –40 °C to +125 °C operation and meets JESD78 latch-up immunity (>250 mA), making it suitable for many automotive under-hood applications. However, it is not AEC-Q100 qualified; for certified automotive use, consult TI's AEC-Q100 qualified variants or perform full system-level qualification per ISO 16750.

What decoupling capacitor value is recommended for SN74AHC273PWRG4?

A 0.1 µF ceramic capacitor placed as close as possible to the VCC pin is recommended for SN74AHC273PWRG4, per Section 8.3 of the datasheet. For systems with multiple power domains or high-frequency noise, paralleling a 1 µF capacitor is acceptable to improve broadband suppression, provided layout minimizes loop inductance.