Texas Instruments CD74ACT273M96

Overview

CD74ACT273M96 from Texas Instruments is an octal D-type flip-flop with asynchronous master reset, fabricated in ACT CMOS technology. It features 5V-only operation (4.5–5.5 V), 12.3 ns typical propagation delay at 5 V/25°C, ±24 mA output drive, and operates across –55°C to +125°C. It serves as a synchronous data latch in digital control logic, bus interface buffering, and state register stages in industrial PLCs and test equipment.

For engineers reviewing the CD74ACT273M96 datasheet, CD74ACT273M96 pinout, CD74ACT273M96 application, or CD74ACT273M96 equivalent, key selection considerations include its TTL-compatible input thresholds, rail-to-rail output swing, reset timing independence from clock edge, and SOIC-20 package compatibility with legacy 5V logic systems.

Technical Context

The CD74ACT273M96 implements eight edge-triggered D flip-flops sharing a common rising-edge clock (CP) and active-low asynchronous master reset (!MR). All Q outputs update synchronously on the positive-going CP transition, while !MR forces all Q outputs low regardless of CP state or timing - enabling deterministic initialization without clock dependency.

Its ACT-series architecture delivers bipolar-compatible speed (97 MHz max clock frequency at 5 V) with CMOS power efficiency (8 µA typical ICC at 25°C), buffered inputs for noise immunity, and balanced tPLH/tPHL delays ensuring minimal skew across all eight channels under matched load conditions.

Key Specifications

Pinout & Package

CD74ACT273M96 is housed in a 20-pin SOIC (DW) package measuring 12.8 mm × 10.3 mm (body: 12.8 mm × 7.5 mm), RoHS-compliant with NIPDAU lead finish and moisture sensitivity level 1 (260°C reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ACT273N, CD74ACT273M96 offers superior board-area efficiency and reflow compatibility, while CD74AC273M96 trades speed and noise margin for supply flexibility - making CD74ACT273M96 optimal for fixed 5V industrial control where density and reliability are prioritized.

Availability

CD74ACT273M96 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and test instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for CD74ACT273M96 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.

CD74ACT273M96 belongs to TI's CD74ACT series - engineered for demanding 5V digital systems requiring TTL compatibility, wide temperature operation, and latchup immunity in industrial and automotive applications.

FAQ

What is the maximum clock frequency supported by CD74ACT273M96?

CD74ACT273M96 supports a maximum clock frequency of 97 MHz at VCC = 5 V and TA = 25°C, with derating to 85 MHz over the full –55°C to +125°C operating range. This value is derived from the specified 5.3 ns minimum CP pulse width and 2 ns setup/hold time requirements under worst-case conditions.

Does CD74ACT273M96 require external pull-up or pull-down resistors on unused inputs?

Yes - all unused inputs on CD74ACT273M96 must be terminated to VCC or GND to prevent floating states that cause undefined operation and increased power consumption. The device does not include internal weak pull-ups or pull-downs, and TI explicitly recommends biasing unused pins to defined logic levels per Section 7.2.1 of the datasheet.

Can CD74ACT273M96 operate at 3.3 V supply voltage?

No - CD74ACT273M96 is an ACT-series device with a specified supply range of 4.5 V to 5.5 V only. Attempting operation at 3.3 V violates recommended conditions and results in non-functional inputs (VIH threshold = 2.0 V min) and unreliable output drive. For 3.3 V systems, consider CD74AC273M96 instead.

What is the purpose of the !MR pin on CD74ACT273M96, and how does it interact with the clock?

The !MR (Master Reset) pin on CD74ACT273M96 is an asynchronous, active-low input that forces all eight Q outputs low immediately upon assertion, independent of the CP signal. Its operation requires no clock edge, and the minimum !MR pulse width is 4.4 ns at 5 V - enabling rapid, deterministic system initialization or fault recovery without clock synchronization.

Is CD74ACT273M96 pin-compatible with older 74LS273 devices?

CD74ACT273M96 shares identical pinout and function mapping with 74LS273 (SOIC-20), including !MR, CP, D0–D7, Q0–Q7, VCC, and GND positions. However, it is not a direct drop-in replacement due to differences in input thresholds, output drive strength, and AC timing - board-level validation is required to confirm signal integrity and timing closure.