Texas Instruments SN74LV273APWRG4

Overview

SN74LV273APWRG4 from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with asynchronous clear, operating across 2 V to 5.5 V supply voltage, delivering 10.5 ns maximum propagation delay at 5 V, 7.1 ns typical tpd at 3.3 V, and supporting partial-power-down via Ioff. It serves as a synchronous data latch in industrial I/O modules and PLC input conditioning circuits.

For engineers reviewing the SN74LV273APWRG4 datasheet, SN74LV273APWRG4 pinout, SN74LV273APWRG4 application, or SN74LV273APWRG4 equivalent, key selection criteria include its wide VCC range (2–5.5 V), guaranteed tpd ≤10.5 ns at 5 V, Ioff-enabled mixed-voltage system compatibility, and 20-pin TSSOP (PW) package with validated 11-pin clock and 1-pin clear routing.

Technical Context

The SN74LV273APWRG4 implements eight independent D-type flip-flops sharing a common clock (CLK) and asynchronous clear (CLR) input, each triggered on the rising edge of CLK. Its CMOS push-pull outputs provide balanced sourcing/sinking capability up to ±12 mA at 5 V, with VOL ≤ 0.55 V and VOH ≥ 3.8 V under full load.

It features Ioff circuitry that disables all outputs when VCC = 0 V, preventing back-current during partial power-down, and supports mixed-mode voltage operation-inputs tolerate up to 5.5 V regardless of VCC level, enabling level translation from higher-voltage logic domains.

Key Specifications

Pinout & Package

TSSOP-20 (PW) package: 6.50 mm × 7.8 mm body, 0.65 mm pitch, exposed thermal pad not present (RGY/RKS only). Pin 1 = CLR, Pin 11 = CLK, Pins 2/5/6/9/12/15/16/19 = Q outputs, Pins 3/4/7/8/13/14/17/18 = D inputs, Pin 10 = GND, Pin 20 = VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC273PWR and 74HC273PW,118, the SN74LV273APWRG4 uniquely combines 2–5.5 V operation, 5.5 V-tolerant inputs, and Ioff-making it the only option for robust, mixed-voltage industrial latching where power sequencing and legacy interface coexist.

Availability

SN74LV273APWRG4 is available at Aetrix Electronics and suitable for industrial I/O modules, power substation controls, and flow meter data acquisition systems requiring stable component supply across extended temperature and mixed-voltage conditions.

Supply support for SN74LV273APWRG4 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 for industrial, automotive, and communications markets.

The SN74LV273APWRG4 belongs to TI's LV logic family, designed specifically for low-voltage, high-noise-immunity applications in harsh industrial environments where wide supply range and power-down safety are mandatory.

FAQ

What is the maximum clock frequency supported by the SN74LV273APWRG4 at 3.3 V?

The SN74LV273APWRG4 supports a maximum clock frequency of 140 MHz at VCC = 3.3 V with CL = 15 pF, as specified in the switching characteristics table. At 50 pF load, the maximum frequency drops to 110 MHz. These values assume proper layout, decoupling, and signal integrity practices per TI's application guidance.

Does the SN74LV273APWRG4 require external pull-up or pull-down resistors on unused inputs?

Yes - all unused inputs of the SN74LV273APWRG4 must be held at a valid logic level (VCC or GND) to prevent floating nodes and excessive ICC. TI recommends 10-kΩ pull-up or pull-down resistors for unused D or CLR inputs; CLK should never be left floating due to potential oscillation and increased power consumption.

Can the SN74LV273APWRG4 drive a 50 pF capacitive load while maintaining timing specifications?

Yes - the SN74LV273APWRG4 is fully characterized for CL = 50 pF across all VCC and temperature ranges. At 5 V, tpd remains ≤12.5 ns and fmax stays ≥70 MHz. Exceeding 50 pF is possible but degrades timing margins and increases ground bounce; TI advises limiting total load to 50 pF for guaranteed specification compliance.

Is the SN74LV273APWRG4 pin-compatible with the standard SN74LS273?

No - the SN74LV273APWRG4 is not pin-compatible with SN74LS273. While both are 20-pin octal D flip-flops with shared CLK and CLR, the LS273 uses SOIC-20 (DW) with different pin mapping (e.g., CLK on Pin 11 vs. LS273 Pin 12) and TTL-level thresholds. Direct replacement requires PCB redesign and logic-level validation.

What thermal metrics apply to the SN74LV273APWRG4 in its TSSOP-20 (PW) package?

For the SN74LV273APWRG4 in PW package, RθJA = 128.2°C/W, RθJC(top) = 70.5°C/W, and RθJB = 79.3°C/W per the August 2023 revision. These values reflect worst-case board-level thermal resistance and must be used with actual power dissipation (≤20 µA ICC + dynamic Cpd losses) to ensure junction temperature remains below 125°C under full-load operation.