Texas Instruments SN74LVC1G18DCKRG4

Overview

SN74LVC1G18DCKRG4 from Texas Instruments is a 1-of-2 noninverting demultiplexer with 3-state deselected outputs, designed for 1.65-V to 5.5-V V_CC operation. It routes input A to Y0 (when S = LOW) or Y1 (when S = HIGH), features ±24-mA output drive at 3.3 V, 3.4-ns max propagation delay at 3.3 V, and I_off support for live insertion in partial-power-down systems - used in Wi-Fi access points and baseband units.

For engineers reviewing the SN74LVC1G18DCKRG4 datasheet, SN74LVC1G18DCKRG4 pinout, SN74LVC1G18DCKRG4 application, or SN74LVC1G18DCKRG4 equivalent, key selection criteria include its 3-state output behavior, over-voltage tolerant inputs (up to 5.5 V), –40°C to +125°C operating range, 6-pin SC70 package, and compatibility with mixed-voltage system interfacing via down-translation support.

Technical Context

This device implements a single-channel 1:2 noninverting demux with active-high select logic and independent 3-state control per output. Its balanced CMOS outputs deliver symmetrical sourcing/sinking capability, while the I_off circuitry disables all I/Os during power-down to prevent back-drive current - critical for hot-swap and multi-rail systems.

The input structure accepts voltages up to 5.5 V regardless of V_CC, enabling level-shifting between 1.8-V, 2.5-V, 3.3-V, and 5-V domains. Propagation delay remains stable across temperature (–40°C to 125°C) and supply (1.65 V to 5.5 V), with t_pd ≤ 4.7 ns at 3.3 V/125°C and CL = 30 pF.

Key Specifications

Pinout & Package

SN74LVC1G18DCKRG4 uses the SC70-6 (DCK) package: 2.00 mm × 1.10 mm, 0.65-mm pitch, 6-pin surface-mount package optimized for space-constrained applications such as notebook PCs and active antenna systems.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 1-of-2 noninverting demultiplexer applications.

Compared with SN74LVC1G18DCKRG4, SN74LVC1G19DCKR provides identical form-factor and timing but inverts data - requiring redesign of control logic - while NC7SZ19P5X trades guaranteed 24-mA drive and superior thermal metrics for marginal cost reduction in thermally benign applications.

Availability

SN74LVC1G18DCKRG4 is available at Aetrix Electronics and suitable for Wi-Fi access point control, baseband unit signal routing, and notebook PC power sequencing requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SN74LVC1G18DCKRG4 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 delivering analog and embedded processing solutions, with leadership in logic, power management, and signal chain technologies.

SN74LVC1G18DCKRG4 belongs to the LVC low-voltage CMOS logic family, engineered for high-speed, low-power, mixed-voltage interfacing in communications infrastructure, computing, and industrial control systems.

FAQ

What is the maximum input voltage allowed on the S and A pins of the SN74LVC1G18DCKRG4?

The SN74LVC1G18DCKRG4 accepts input voltages up to 5.5 V on both S and A pins, regardless of V_CC level - enabling direct interfacing with 5-V controllers even when powered from 1.8-V or 2.5-V supplies. This over-voltage tolerance is specified in the Recommended Operating Conditions table and verified per JEDEC JESD8-12.

Does the SN74LVC1G18DCKRG4 support hot-swap or live-insertion applications?

Yes, the SN74LVC1G18DCKRG4 supports live insertion via its I_off feature: when V_CC = 0 V, all I/O pins enter a high-impedance state with leakage limited to ±10 µA, preventing damaging back-current flow. This is explicitly validated in the Electrical Characteristics section and meets JESD78 Class II latch-up requirements.

What is the propagation delay of the SN74LVC1G18DCKRG4 at 1.8 V and 125°C?

At V_CC = 1.8 V and T_A = 125°C with C_L = 30 pF, the SN74LVC1G18DCKRG4 has a maximum propagation delay (t_pd) of 9.8 ns from A to Y, as specified in Section 6.7 (Switching Characteristics, –40 to 125°C) of the SCES406L datasheet.

Can unused inputs on the SN74LVC1G18DCKRG4 be left floating?

No - all unused inputs on the SN74LVC1G18DCKRG4 must be terminated to either V_CC or GND to prevent undefined logic states, oscillation, or excessive ICC. The datasheet mandates this in Section 6.3 (Recommended Operating Conditions) and Section 11 (Layout Guidelines), citing TI application report SCBA004.

Is the SN74LVC1G18DCKRG4 pin-compatible with other members of the SN74LVC1Gxx family?

No - the SN74LVC1G18DCKRG4 has a unique 6-pin SC70 pinout specific to its 1-of-2 demux function. While other SN74LVC1Gxx devices (e.g., SN74LVC1G00, SN74LVC1G125) share the same SC70-6 package outline, their pin assignments differ significantly; direct substitution requires PCB layout revision.