Texas Instruments SN74LVCH16540ADGGR

Overview

SN74LVCH16540ADGGR 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, each with independent active-low 2-input AND-gated output-enable (OE1/OE2), bus-hold on all inputs, Ioff partial-power-down support, and 5.5-V-tolerant inputs-enabling mixed-mode 3.3-V/5-V signal translation in industrial backplanes and memory subsystems.

For engineers reviewing the SN74LVCH16540ADGGR datasheet, SN74LVCH16540ADGGR pinout, SN74LVCH16540ADGGR application, or SN74LVCH16540ADGGR equivalent, this device is selected for high-speed bidirectional bus isolation where low ground bounce (<0.8 V), fast propagation delay (3.7 ns at 3.3 V), and latch-up immunity (>250 mA) are critical in 48-pin TSSOP layouts.

Technical Context

This device implements two independent 8-bit noninverting buffer sections, each controlled by a 2-input AND gate with active-low OE inputs-ensuring high-impedance output when either OE1 or OE2 is high. The bus-hold circuitry actively maintains valid logic states on undriven inputs without external resistors, eliminating floating node risks in hot-swap or low-activity bus segments.

Its Ioff specification enables safe partial-power-down operation by disabling outputs and blocking current backflow when VCC = 0 V, while input tolerance up to 5.5 V allows direct interfacing with legacy 5-V logic in 3.3-V systems-no level-shifter required. Propagation delay (tpd) and enable/disable timing (ten/tdis) are characterized across 1.65–3.6 V, supporting stable timing margins in multi-voltage domain designs.

Key Specifications

Pinout & Package

TSSOP-48 (DGG) package, 12.5 mm × 6.1 mm × 1.2 mm max height, RoHS-compliant NIPDAU finish, MSL Level-1, 2000-unit tape-and-reel.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16244ADGGR and 74ALVC164245DGGR, the SN74LVCH16540ADGGR uniquely combines bus-hold, Ioff, and full 5.5-V input tolerance in a unidirectional 16-bit buffer-making it optimal for robust, low-BOM-count industrial bus isolation where power sequencing and floating inputs are design constraints.

Availability

SN74LVCH16540ADGGR is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory subsystem buffering, automated test equipment signal routing, and FPGA-to-legacy-peripheral interfacing requiring stable component supply across extended temperature ranges.

Supply support for SN74LVCH16540ADGGR 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, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The SN74LVCH16540ADGGR belongs to TI's Widebus™ family-designed specifically for high-speed, low-voltage, wide-data-path bus interface applications in industrial automation and computing infrastructure.

FAQ

What is the maximum operating temperature range for the SN74LVCH16540ADGGR?

The SN74LVCH16540ADGGR is rated for operation from –40°C to +85°C ambient temperature, fully specified across this industrial temperature range per its recommended operating conditions. This range is validated for all electrical parameters including propagation delay, output drive, and bus-hold functionality-making SN74LVCH16540ADGGR suitable for deployment in harsh environments such as factory-floor PLCs and outdoor telecom equipment.

Does the SN74LVCH16540ADGGR require external pullup resistors on its OE pins?

Yes-the SN74LVCH16540ADGGR OE inputs are active-low, and to ensure outputs remain in high-impedance during power-up or power-down, each OE pin (1OE1, 1OE2, 2OE1, 2OE2) must be tied to VCC through a pullup resistor. The minimum resistance value depends on the driver's current-sinking capability; TI recommends values ≥10 kΩ for typical use cases. This requirement applies directly to SN74LVCH16540ADGGR and is documented in the functional description section of its datasheet.

Can the SN74LVCH16540ADGGR safely interface a 5-V microcontroller with a 3.3-V FPGA?

Yes-the SN74LVCH16540ADGGR accepts input voltages up to 5.5 V regardless of VCC level, enabling direct connection from 5-V microcontroller outputs to its A-inputs while driving 3.3-V FPGA inputs from its Y-outputs. Its 1.65–3.6-V VCC range and rail-compatible VOL/VOH ensure logic-level compatibility. This capability is intrinsic to SN74LVCH16540ADGGR and verified across all operating conditions in the datasheet's mixed-mode specifications.

How does the bus-hold feature of the SN74LVCH16540ADGGR eliminate external resistors?

The SN74LVCH16540ADGGR integrates active bus-hold circuitry on all 16 A-inputs, which detects undriven or floating states and applies a weak feedback current (~±45 µA) to maintain the last-valid logic level. This eliminates the need for discrete 10-kΩ pullup or pulldown resistors-reducing component count, board area, and potential signal integrity issues. Bus-hold behavior is inherent to SN74LVCH16540ADGGR and enabled by default; no configuration is required.

Is the SN74LVCH16540ADGGR pin-compatible with other 48-pin TSSOP logic buffers?

No-SN74LVCH16540ADGGR has a unique 48-pin TSSOP (DGG) pinout optimized for dual 8-bit sections with distributed VCC/GND and OE placement. While physical package dimensions match JEDEC MO-153, pin functions (e.g., 1OE1 at Pin 1, 1Y1 at Pin 2, GND at Pin 4) differ from generic 16-bit buffers like SN74LVC16244A or 74ALVC164245. Direct replacement requires schematic and layout revision; SN74LVCH16540ADGGR must be placed using its specific footprint and netlist.