Texas Instruments SN74LVC1G79WDCKREP

Overview

SN74LVC1G79WDCKREP from Texas Instruments is a single positive-edge-triggered D-type flip-flop designed for 1.65-V to 5.5-V V_CC operation, with 5 ns max t_pd at 3.3 V, ±24-mA output drive, and I_off support for partial-power-down mode. It serves as a synchronous data latch in timing-critical digital logic paths such as clock domain crossing, signal synchronization, and metastability mitigation in aerospace-grade control systems.

For engineers reviewing the SN74LVC1G79WDCKREP datasheet, SN74LVC1G79WDCKREP pinout, SN74LVC1G79WDCKREP application, or SN74LVC1G79WDCKREP equivalent, key selection criteria include its military-temperature range (–55°C to 115°C), SC-70 (DCK) 5-pin package, 160-MHz max clock frequency, I_off protection, and 10-µA max ICC - all critical for high-reliability embedded timing and data capture circuits.

Technical Context

This device implements a single-bit, edge-triggered storage element with asynchronous behavior fully suppressed by strict setup (t_su = 1.2 ns min at 3.3 V) and hold (t_h = 0.5 ns min at 3.3 V) timing constraints. Its input structure accepts voltages up to 5.5 V independent of V_CC, enabling mixed-voltage interfacing across 1.8-V, 2.5-V, 3.3-V, and 5-V logic domains.

The flip-flop operates with rail-to-rail output swing (V_OH ≥ V_CC – 0.1 V, V_OL ≤ 0.1 V), supports hot-insertion via I_off (≤10 µA leakage when powered down), and exhibits latch-up immunity >100 mA per JESD 78 Class II - confirming suitability for mission-critical avionics and medical electronics where fault tolerance and voltage robustness are mandatory.

Key Specifications

Pinout & Package

SN74LVC1G79WDCKREP is housed in a 5-pin SC-70 (DCK) package measuring 2.15 mm × 1.40 mm × 1.10 mm (max height), optimized for space-constrained PCB layouts in high-density avionics modules and portable medical instrumentation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G79DBVR and SN74AUP1G79DBVR, SN74LVC1G79WDCKREP uniquely combines military-grade temperature range, 5.5-V input tolerance, and I_off protection - making it the sole option for high-integrity, mixed-voltage, thermally demanding applications where failure is not an option.

Availability

SN74LVC1G79WDCKREP is available at Aetrix Electronics and suitable for aerospace data acquisition, medical imaging timing control, defense radar pulse conditioning, and industrial PLC signal isolation requiring stable component supply across extended temperature and mixed-voltage environments.

Supply support for SN74LVC1G79WDCKREP 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 high-reliability logic solutions for industrial, automotive, and aerospace markets.

The SN74LVC1G79-EP product line delivers enhanced-product (EP) versions of standard logic ICs - engineered for extended temperature operation, controlled manufacturing baselines, and full traceability to meet defense, aerospace, and medical regulatory requirements.

FAQ

What is the maximum clock frequency supported by SN74LVC1G79WDCKREP?

SN74LVC1G79WDCKREP supports a maximum clock frequency of 160 MHz across its full operating temperature range (–55°C to 115°C) and V_CC range (1.65 V to 5.5 V). This specification is guaranteed under load conditions of C_L = 30 pF or 50 pF and applies to both rising and falling edges of the clock signal, as confirmed in the switching characteristics table of the official TI datasheet SCES646A.

Does SN74LVC1G79WDCKREP support partial-power-down operation?

Yes, SN74LVC1G79WDCKREP features I_off circuitry that disables outputs and limits leakage current to ±10 µA when V_CC = 0 V. This allows safe partial-power-down operation in multi-rail systems, preventing damaging backflow current through the device - a requirement explicitly verified in the Electrical Characteristics section of the TI datasheet SCES646A.

What package type and dimensions does SN74LVC1G79WDCKREP use?

SN74LVC1G79WDCKREP uses the SC-70 (DCK) package: a 5-pin surface-mount outline measuring 2.15 mm × 1.40 mm × 1.10 mm (max height). Pin 1 is located in the top-left corner with a molded index area, and the package complies with JEDEC MO-203 standards - details confirmed in TI's DCK0005A mechanical drawing and PACKAGE OPTION ADDENDUM.

Is SN74LVC1G79WDCKREP compatible with 5-V input signals while operating at 1.8-V V_CC?

Yes, SN74LVC1G79WDCKREP accepts input voltages up to 5.5 V on both D and CLK pins regardless of V_CC level - including when V_CC = 1.8 V. This 5.5-V tolerant input capability is specified in the Absolute Maximum Ratings and Recommended Operating Conditions tables of the TI datasheet SCES646A, enabling direct interfacing with legacy 5-V logic without external level shifters.

What is the propagation delay (t_pd) of SN74LVC1G79WDCKREP at 3.3-V supply?

At V_CC = 3.3 V and T_A = 25°C, SN74LVC1G79WDCKREP has a typical propagation delay (t_pd) of 1.7 ns and a maximum of 5 ns, measured from CLK to Q under C_L = 50 pF loading. These values are guaranteed across the full –55°C to 115°C temperature range per the Switching Characteristics table in TI's SCES646A datasheet.