Texas Instruments SN74LVCH16540ADLR

Overview

SN74LVCH16540ADLR from Texas Instruments is a 16-bit noninverting buffer/driver with 3-state outputs, designed for 1.65-V to 3.6-V VCC operation in wide-bus data-path interfaces. It features dual 8-bit sections, bus-hold on all inputs, Ioff partial-power-down support, and mixed-mode 5-V-tolerant inputs with 3.3-V supply-enabling use as a level translator in 3.3-V/5-V hybrid systems.

For engineers reviewing the SN74LVCH16540ADLR datasheet, SN74LVCH16540ADLR pinout, SN74LVCH16540ADLR application, or SN74LVCH16540ADLR equivalent, key selection considerations include 3-state timing (tdis = 5.9 ns max at 3.3 V), bus-hold current (±45 µA at 2.3 V), Ioff leakage (<10 µA), output drive strength (±24 mA at 3 V), and TSSOP-48 package compatibility with high-density PCB layouts.

Technical Context

This device implements two independent 8-bit noninverting buffer sections, each controlled by a dual-input active-low AND gate (OE1/OE2). Outputs enter high-impedance state when either OE input is high, ensuring robust bus isolation during power sequencing or idle states.

Its bus-hold circuitry actively maintains valid logic levels on undriven inputs without external resistors, while Ioff protection prevents backflow current during partial power-down-critical for hot-swap and multi-rail system designs operating across –40°C to 85°C.

Key Specifications

Pinout & Package

TSSOP-48 (DGG) package: 12.6 mm × 6.2 mm × 1.2 mm body, 0.5-mm lead pitch, gull-wing leads, RoHS-compliant NiPdAu finish, MSL Level-1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit 3-state buffer applications.

Compared with SN74LVCH16540ADLR, SN74LVC16244ADGGR lacks bus-hold and 5-V input tolerance-increasing BOM and layout complexity-while 74ALVCH16540MTD offers identical functionality with AEC-Q100 qualification, making it preferable for automotive deployments requiring extended temperature and stress validation.

Availability

SN74LVCH16540ADLR is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, automotive body control modules, and medical imaging data acquisition systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant TSSOP packaging.

Supply support for SN74LVCH16540ADLR 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, personal electronics, and communications markets.

The SN74LVCH16540ADLR belongs to TI's Widebus™ family of high-speed, low-voltage logic devices engineered specifically for wide-data-path buffering, bus isolation, and mixed-voltage system interfacing in space-constrained industrial and computing applications.

FAQ

What is the maximum clock/data rate supported by SN74LVCH16540ADLR?

The SN74LVCH16540ADLR does not operate on a clock; it is a combinatorial buffer. Its 3.7-ns maximum propagation delay at 3.3 V supports reliable operation in parallel bus systems with data valid windows down to ~270 MHz. System-level timing depends on board layout, load capacitance, and driving source characteristics-not internal clocking.

Does SN74LVCH16540ADLR require external pullup resistors on its OE pins?

Yes-TI recommends tying OE pins to VCC through a pullup resistor to ensure high-impedance state during power-up or power-down. The minimum resistor value depends on the current-sinking capability of the driving source; typical values range from 4.7 kΩ to 10 kΩ for standard logic drivers.

Can SN74LVCH16540ADLR be used in a 5-V-only system?

No-SN74LVCH16540ADLR requires VCC between 1.65 V and 3.6 V. While its inputs tolerate up to 5.5 V, applying 5 V to VCC exceeds absolute maximum ratings and will damage the device. For 5-V systems, use 74ACT or 74F series equivalents instead.

How does bus-hold functionality work on SN74LVCH16540ADLR inputs?

Each input has an internal weak feedback circuit that senses its voltage and drives it toward the last-valid logic state. At VCC = 2.3 V, bus-hold current is ±45 µA-sufficient to override typical PCB leakage but not strong enough to conflict with active drivers. TI advises against using external pullups/pulldowns with this feature enabled.

Is SN74LVCH16540ADLR pin-compatible with SN74LVCH16541ADLR?

No-SN74LVCH16540ADLR is a noninverting buffer, while SN74LVCH16541ADLR is an inverting buffer. Though both are 16-bit 3-state devices in TSSOP-48, their logic functions differ: Y = A for SN74LVCH16540ADLR versus Y = NOT A for SN74LVCH16541ADLR. Pinouts are identical, but functional substitution requires logic inversion in upstream/downstream logic.