Texas Instruments SN74LVC1G99QDCURQ1

Overview

SN74LVC1G99QDCURQ1 from Texas Instruments is an automotive-grade ultra-configurable multiple-function logic gate with 3-state output, operating from 1.65 V to 5.5 V, supporting nine logic functions (MUX, AND, OR, NAND, NOR, XOR, XNOR, inverter, buffer), ±24-mA drive at 3.3 V, and input hysteresis for noise immunity - used in reconfigurable signal routing and level-shifting interfaces in ADAS domain controllers.

For engineers reviewing the SN74LVC1G99QDCURQ1 datasheet, SN74LVC1G99QDCURQ1 pinout, SN74LVC1G99QDCURQ1 application, or SN74LVC1G99QDCURQ1 equivalent, key selection concerns include configurable logic mapping, Ioff-enabled partial-power-down support, Schmitt-trigger input thresholds (VT+ = 2.84 V / VT– = 1.89 V at 4.5 V), 3-state enable timing (ten = 2 ns, tdis = 1 ns at 5 V), and VSSOP-8 package compatibility with space-constrained automotive PCBs.

Technical Context

This device implements a 4-bit programmable function generator with OE-controlled 3-state output, where logic behavior is selected via four static inputs (A–D) defining one of 16 truth table patterns. Its Schmitt-trigger inputs provide asymmetric thresholds (ΔVT = 0.71 V min at 4.5 V) to tolerate slow-rising signals and reject noise on control lines.

The Ioff circuitry ensures outputs remain high-impedance during power sequencing, preventing backflow when VCC = 0 V while inputs are biased to 5.5 V. All inputs tolerate 5.5 V regardless of VCC, enabling mixed-voltage interfacing between 1.8-V, 3.3-V, and 5-V domains without external level shifters.

Key Specifications

Pinout & Package

VSSOP-8 (DCU) package: 2.3 mm × 2.0 mm footprint, 0.5 mm pitch, 0.9 mm max height, lead-free NIPDAU finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar configurable logic gate applications.

Compared with SN74LVC1G99QDCURQ1, SN74LVC1G97QDCURQ1 offers simpler configuration but sacrifices MUX capability and full hysteresis, while SN74LVC1G57QDCURQ1 omits automotive qualification and Ioff - making SN74LVC1G99QDCURQ1 the sole choice for reconfigurable, safety-aware automotive signal conditioning.

Availability

SN74LVC1G99QDCURQ1 is available at Aetrix Electronics and suitable for ADAS sensor interface, body control module, and infotainment display backlight control applications requiring stable component supply across automotive production lifecycles.

Supply support for SN74LVC1G99QDCURQ1 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 company specializing in analog, embedded processing, and automotive ICs, with leadership in high-reliability interface and logic solutions.

The SN74LVC1G99-Q1 belongs to TI's automotive-qualified LVC logic family, designed specifically for reconfigurable signal conditioning in harsh-environment electronic control units where flexibility, low power, and robustness are critical.

FAQ

What logic functions does the SN74LVC1G99QDCURQ1 support?

The SN74LVC1G99QDCURQ1 supports nine distinct logic functions: 3-state buffer, 3-state inverter, 3-state 2-to-1 MUX (standard and inverted), 3-state 2-input AND/NAND/OR/NOR/XOR/XNOR. Each is selected via unique 4-bit input combinations (A–D) per the function table in the SCES828 datasheet. The SN74LVC1G99QDCURQ1 does not support sequential or memory-based functions - it is purely combinational and reconfigurable at power-up or runtime via static inputs.

How does the Ioff feature work on the SN74LVC1G99QDCURQ1?

The Ioff feature on the SN74LVC1G99QDCURQ1 disables all output drivers when VCC = 0 V, blocking current flow from powered inputs (up to 5.5 V) into the unpowered device. This prevents damaging back-current in partial-power-down scenarios such as hot-plug modules or ECU sleep modes. The SN74LVC1G99QDCURQ1 guarantees Ioff ≤ ±10 μA across –40°C to 125°C, meeting AEC-Q100 requirements for automotive power sequencing integrity.

Can the SN74LVC1G99QDCURQ1 operate with a 1.8-V supply?

Yes, the SN74LVC1G99QDCURQ1 operates reliably from 1.65 V to 5.5 V, including 1.8-V nominal rails. At 1.8 V ± 0.15 V, it delivers 4 mA output drive (IOL/IOH), supports 20 ns/V input transition rate, and maintains valid VT+ (0.79 V) and VT– (0.39 V) thresholds. The SN74LVC1G99QDCURQ1 is fully characterized for 1.8-V operation in the recommended conditions table of SCES828, making it suitable for low-voltage microcontroller I/O expansion.

What is the purpose of the Schmitt-trigger inputs on the SN74LVC1G99QDCURQ1?

The Schmitt-trigger inputs on the SN74LVC1G99QDCURQ1 provide hysteresis (ΔVT = 0.56 V min at 3 V) to reject noise and accommodate slow-rising/falling signals - critical for automotive wake-up lines, mechanical switch debouncing, or unshielded sensor interfaces. Unlike standard CMOS inputs, the SN74LVC1G99QDCURQ1 has distinct VT+ (positive-going threshold) and VT– (negative-going threshold), ensuring clean, bounce-free transitions even with millisecond-scale edge rates.

Is the SN74LVC1G99QDCURQ1 pin-compatible with other single-gate LVC devices in VSSOP-8?

No, the SN74LVC1G99QDCURQ1 has a unique 8-pin VSSOP (DCU) pinout optimized for its 4-bit configuration architecture: pins 1 (OE), 2 (A), 3 (B), 4 (GND), 5 (Y), 6 (D), 7 (C), 8 (VCC). It is not pin-compatible with standard single-gate devices like SN74LVC1G00 or SN74LVC1G14, which use different pin assignments for inputs/outputs. Layout reuse requires verification against the DCU top-view diagram in SCES828.