Texas Instruments SN74LVC1G99DCTRG4

Overview

SN74LVC1G99DCTRG4 from Texas Instruments is an ultra-configurable 4-input logic gate IC with 3-state output, operating from 1.65 V to 5.5 V, supporting 5-V tolerant inputs and delivering ±24-mA drive at 3.3 V. It implements 9 logic functions-including MUX, AND, OR, NAND, NOR, XOR, XNOR, buffer, and inverter-via 4-bit configuration inputs (A–D), and features Schmitt-trigger inputs for noise immunity in slow-signal applications.

For engineers reviewing the SN74LVC1G99DCTRG4 datasheet, SN74LVC1G99DCTRG4 pinout, SN74LVC1G99DCTRG4 application, or SN74LVC1G99DCTRG4 equivalent, this device serves as a space-optimized, single-chip replacement for multiple discrete logic gates in low-power, voltage-flexible digital control paths, I/O expansion interfaces, and configurable signal routing nodes.

Technical Context

The SN74LVC1G99DCTRG4 uses a programmable logic array architecture where four input pins (A–D) select one of 16 truth-table configurations, enabling dynamic reconfiguration of logic function without changing hardware. Its 3-state output is controlled by OE, with active-low enable and high-impedance state guaranteed during power-up/down via Ioff circuitry.

Input hysteresis (ΔVT = 0.56–1.21 V) provides robust noise rejection for slow-rising/falling signals, while rail-to-rail input tolerance (up to 5.5 V) and down-translation capability allow interfacing across mixed-voltage domains. The device supports partial-power-down operation and live insertion per JESD 78 Class II latch-up compliance.

Key Specifications

Pinout & Package

SN74LVC1G99DCTRG4 is packaged in an 8-pin SSOP (DCT) package, 3.0 mm × 4.4 mm, 1.3 mm max height, with gull-wing leads and RoHS-compliant NiPdAu finish. Pin 1 is marked by a beveled corner and located in quadrant Q3 per tape-and-reel orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G97DCTRG4 and SN74LVC1G57DCTRG4, the SN74LVC1G99DCTRG4 uniquely combines full 4-input configurability, Schmitt-trigger inputs, and 3-state output in a single DCT package - making it the only option among the three for dynamic logic reconfiguration in shared-bus or noise-prone industrial I/O designs.

Availability

SN74LVC1G99DCTRG4 is available at Aetrix Electronics and suitable for industrial control panels, battery-powered sensor nodes, USB-C accessory designs, and configurable I²C interface modules requiring stable component supply across extended product lifecycles.

Supply support for SN74LVC1G99DCTRG4 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 over 50 years of innovation in high-reliability, low-power IC design.

The SN74LVC1G99DCTRG4 belongs to TI's LVC logic family, engineered for voltage-flexible, space-constrained digital control applications where configurability, noise immunity, and bus-sharing capability are critical.

FAQ

What logic functions does the SN74LVC1G99DCTRG4 support?

The SN74LVC1G99DCTRG4 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 (with and without input inversion), and 3-state XOR/XNOR. Function selection is determined by the 4-bit combination applied to inputs A–D, as defined in the device's function selection table.

How does the SN74LVC1G99DCTRG4 handle power-up sequencing to avoid output glitches?

The SN74LVC1G99DCTRG4 avoids output glitches during power-up by requiring OE to be tied to VCC through a pullup resistor. This forces the output into high-impedance state until valid logic levels are established on all inputs. The minimum resistor value depends on the driver's current-sinking capability, and TI recommends verifying stability under worst-case VCC ramp rates.

Can the SN74LVC1G99DCTRG4 operate with a 1.8-V supply while interfacing to 3.3-V or 5-V signals?

Yes, the SN74LVC1G99DCTRG4 supports down-translation: it operates from 1.65 V to 5.5 V and accepts input voltages up to 5.5 V regardless of VCC level. When powered from 1.8 V, it safely interfaces with 3.3-V or 5-V logic sources without external level shifters, maintaining full 3-state output control and logic functionality.

What is the purpose of the Schmitt-trigger inputs on the SN74LVC1G99DCTRG4?

The Schmitt-trigger inputs on the SN74LVC1G99DCTRG4 provide hysteresis (ΔVT = 0.56–1.21 V), giving distinct positive-going (VT+) and negative-going (VT–) thresholds. This prevents chatter on slow-rising or noisy signals - such as mechanical switch closures or analog sensor outputs - eliminating the need for external RC filtering and improving system reliability in industrial environments.

Is the SN74LVC1G99DCTRG4 pin-compatible with other members of the SN74LVC1Gxx series?

No, the SN74LVC1G99DCTRG4 is not pin-compatible with most other SN74LVC1Gxx devices due to its unique 4-input configuration architecture and dedicated A–D pins. While it shares the same 8-pin DCT package footprint with SN74LVC1G57DCTRG4 and SN74LVC1G97DCTRG4, the pin assignments differ: SN74LVC1G99DCTRG4 assigns pins 2–3 and 5–6 to configuration inputs (A–D), whereas others use those pins for data or control signals.