Texas Instruments SN74AUP1G79DBVRG4

Overview

SN74AUP1G79DBVRG4 from Texas Instruments is a single positive-edge-triggered D-type flip-flop in a 5-pin SOT-23 (DBV) package, operating across 0.8 V–3.6 V supply range, with 4 ns max propagation delay at 3.3 V, 0.9 µA max ICC, and Ioff support for partial power-down mode - used for direction detection in rotary quadrature encoders and low-power data synchronization in portable embedded systems.

For engineers reviewing the SN74AUP1G79DBVRG4 datasheet, SN74AUP1G79DBVRG4 pinout, SN74AUP1G79DBVRG4 application, or SN74AUP1G79DBVRG4 equivalent, key selection criteria include its ultra-low static/dynamic power consumption, voltage-level clock triggering independent of rise time, input hysteresis (250 mV typ), 3.6-V I/O tolerance, and guaranteed operation down to –40°C.

Technical Context

The SN74AUP1G79DBVRG4 implements a synchronous edge-triggered storage element where data transfer from D to Q occurs only on the positive-going clock transition meeting setup/hold timing. Clock triggering is voltage-threshold-based-not slew-rate dependent-enabling robust operation with slow or noisy clocks when combined with 250 mV typical input hysteresis.

It features balanced CMOS push-pull outputs capable of ±4 mA drive at 3 V, standard CMOS inputs with 1.5 pF typical capacitance, and Ioff circuitry that disables I/Os during power-down to prevent backflow current. Input overvoltage tolerance up to 4.6 V supports mixed-voltage interfacing without level shifters.

Key Specifications

Pinout & Package

SOT-23 (DBV) package: 2.90 mm × 1.60 mm body, 5-pin surface-mount, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G79DBVR and 74AHC1G79SE-7, the SN74AUP1G79DBVRG4 uniquely combines sub-1 µA static current, Ioff-enabled power-domain isolation, and input hysteresis - making it the only choice for battery-powered encoder interfaces and mixed-voltage field transmitters requiring guaranteed operation across full industrial temperature range.

Availability

SN74AUP1G79DBVRG4 is available at Aetrix Electronics and suitable for barcode scanners, HVAC control panels, e-book readers, and industrial field transmitters requiring stable component supply with long-term lifecycle assurance.

Supply support for SN74AUP1G79DBVRG4 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 delivering analog and embedded processing solutions, with over 90 years of innovation in low-power logic, precision analog, and real-time control ICs.

The AUP family-including SN74AUP1G79DBVRG4-is engineered specifically for battery-powered portable electronics, optimizing static/dynamic power trade-offs across 0.8–3.6 V while preserving signal integrity and noise immunity in space-constrained designs.

FAQ

What is the maximum clock frequency supported by SN74AUP1G79DBVRG4 at 1.8 V?

The SN74AUP1G79DBVRG4 supports up to 140 MHz maximum clock frequency at 1.8 V ± 0.15 V over the full –40°C to +85°C operating range, as specified in the Timing Requirements table (Section 6.7). This is measured under load conditions with CL = 15 pF and accounts for worst-case process/voltage/temperature corners. The actual usable frequency in a design depends on board layout, trace impedance, and output loading.

Does SN74AUP1G79DBVRG4 require external pull-up or pull-down resistors on unused inputs?

Yes - all unused inputs of SN74AUP1G79DBVRG4 must be held at VCC or GND to assure proper device operation and prevent floating node-induced current leakage or oscillation. This requirement is explicitly stated in TI's application report "Implications of Slow or Floating CMOS Inputs." Leaving D or CLK unconnected may cause unpredictable Q output behavior and increased ICC.

Can SN74AUP1G79DBVRG4 drive a 50-pF capacitive load reliably?

No - SN74AUP1G79DBVRG4 is characterized up to 30 pF load capacitance. At CL = 30 pF and 3.3 V, tpd increases to 7.2 ns max and fmax drops to 260 MHz (TA = –40°C to +85°C). Driving 50 pF exceeds specification limits, causing excessive propagation delay, reduced noise margin, and potential signal integrity issues. For >30 pF loads, add a buffer stage or select a higher-drive logic family.

Is SN74AUP1G79DBVRG4 compatible with 5-V-tolerant microcontrollers?

SN74AUP1G79DBVRG4 inputs are rated for up to 4.6 V per Absolute Maximum Ratings, but its outputs swing only to VCC (max 3.6 V). When interfacing with 5-V microcontrollers, the SN74AUP1G79DBVRG4 can safely receive 5-V signals only if current-limited per clamp diode ratings (–50 mA max IIK), but cannot drive 5-V inputs directly. A level-shifting buffer or resistor-divider is required for bidirectional 5-V compatibility.

How does the Ioff feature function in SN74AUP1G79DBVRG4 during system power sequencing?

When VCC = 0 V, the Ioff circuitry in SN74AUP1G79DBVRG4 places both D and Q terminals in high-impedance state, limiting leakage to ≤0.6 µA per pin. This prevents back-current flow from powered downstream logic into the unpowered SN74AUP1G79DBVRG4 - critical for safe power sequencing in multi-rail systems such as USB-C PD adapters or modular industrial controllers where subsystems power up/down independently.