Texas Instruments SN74HC273PWR-P

Overview

SN74HC273PWR-P from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with active-low asynchronous clear, operating across 2 V to 6 V. It features eight independent data inputs and single-rail outputs, ±4-mA drive at 5 V, 12-ns typical propagation delay, and 80-µA maximum ICC - used in synchronous data latching and register storage within industrial control logic and digital instrumentation.

For engineers reviewing the SN74HC273PWR-P datasheet, SN74HC273PWR-P pinout, SN74HC273PWR-P application, or SN74HC273PWR-P equivalent, key selection considerations include its TSSOP-20 package, 25-MHz max clock frequency at 4.5 V, direct-clear functionality, and compatibility with LSTTL loads in buffered register designs.

Technical Context

The SN74HC273PWR-P implements eight edge-triggered D flip-flops sharing a common clock (CLK) and global active-low clear (CLR), with no internal feedback or preset capability. Each flip-flop transfers data from its dedicated D input to Q output on the rising edge of CLK, provided setup/hold timing is met.

It uses standard CMOS silicon process with rail-to-rail input voltage tolerance (0–VCC), low input current (≤1 µA), and balanced output drive. Its functional behavior is defined strictly by the truth table: CLR = L forces all Q = L regardless of CLK or D; otherwise, Q follows D on CLK↑.

Key Specifications

Pinout & Package

TSSOP-20 (PW) package: 6.50 mm × 4.40 mm body, 0.65-mm lead pitch, surface-mount, RoHS-compliant, moisture sensitivity level 1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC273PWR-P, SN74HCT273PWR offers guaranteed TTL-level input recognition at 5 V but consumes more quiescent power, while 74LCX273MTCX delivers faster switching in 3.3-V systems but requires PCB revision due to incompatible pin mapping.

Availability

SN74HC273PWR-P is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, digital instrumentation data capture, motor control logic registers, and legacy bus interface buffering requiring stable component supply and long-term production continuity.

Supply support for SN74HC273PWR-P 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 ICs with broad industrial, automotive, and consumer design support infrastructure.

The SN74HC273PWR-P belongs to TI's 74HC logic family - designed for high-noise-immunity, low-power, pin-compatible replacements of legacy TTL devices in general-purpose digital logic applications.

FAQ

What is the maximum clock frequency supported by SN74HC273PWR-P?

The SN74HC273PWR-P supports a maximum clock frequency of 25 MHz at VCC = 4.5 V and 21 MHz across its full operating temperature range (–40°C to +85°C). This value is verified per TI's SCLS136F datasheet Section 6.10 and applies specifically to the SN74HC273 variant in TSSOP-20 packaging. Higher frequencies may cause setup/hold violations or metastability.

Does SN74HC273PWR-P have a synchronous or asynchronous clear function?

The SN74HC273PWR-P features an asynchronous active-low clear (CLR) input - meaning all eight Q outputs are forced low immediately upon assertion of CLR, regardless of clock state or timing. This behavior is confirmed in the functional description (Section 3), truth table (Table 8-1), and pin function table (Section 5) of the official datasheet.

Can SN74HC273PWR-P drive LSTTL loads directly?

Yes, SN74HC273PWR-P can drive up to 10 LSTTL loads per output, as stated in the Features section and validated by its ±4-mA output drive specification at VCC = 5 V. This capability eliminates the need for external buffer stages in most medium-density logic interfacing scenarios.

What is the recommended bypass capacitor for SN74HC273PWR-P?

Texas Instruments recommends a 0.1-µF ceramic capacitor placed as close as possible to the VCC pin (Pin 20) and GND (Pin 10) of SN74HC273PWR-P. This is specified in Section 10 (Power Supply Recommendations) and Section 11.1 (Layout Guidelines) of the datasheet to suppress high-frequency noise and stabilize supply voltage during switching transitions.

Is SN74HC273PWR-P pin-compatible with SN74HC273N (PDIP-20)?

Yes, SN74HC273PWR-P (TSSOP-20) and SN74HC273N (PDIP-20) share identical pin numbering, signal assignments, and electrical functionality - confirmed in Table 5-1 (Pin Functions) and the Device Information table. However, their physical footprints and thermal characteristics differ significantly, requiring separate PCB layouts.