Texas Instruments 74LVCH16T245DLG4

Overview

74LVCH16T245 from Texas Instruments is a 16-bit dual-supply noninverting bus transceiver with configurable level-shifting between 1.65 V and 5.5 V rails, tri-state outputs, bus-hold inputs, and VCC isolation. It supports bidirectional data flow (A↔B), operates with independent VCCA and VCCB supplies, and delivers propagation delays as low as 0.3 ns (OE→output) at 5 V. It is used in mixed-voltage system interconnects such as 1.8-V microcontrollers interfacing to 3.3-V peripherals.

For engineers reviewing the 74LVCH16T245 datasheet, 74LVCH16T245 pinout, 74LVCH16T245 application, or 74LVCH16T245 equivalent, key selection criteria include dual-rail voltage translation range (1.65–5.5 V per port), Ioff partial-power-down support, bus-hold input retention, VCC isolation behavior, and TSSOP-48 package compatibility with high-density PCB layouts.

Technical Context

The 74LVCH16T245 implements two independent 8-bit transceiver channels (1A/1B and 2A/2B), each controlled by dedicated DIR and OE pins referenced to VCCA. Direction control is asynchronous: DIR high enables A→B transmission; DIR low enables B→A. Output-enable logic is active-low: OE low activates outputs; OE high forces both ports into high-impedance.

Its dual-supply architecture decouples A-port I/Os (VCCA-referenced) from B-port I/Os (VCCB-referenced), enabling simultaneous operation across mismatched voltage domains. Bus-hold circuitry actively maintains undriven data inputs at valid logic levels without external resistors, and Ioff limits reverse current when either supply is at GND.

Key Specifications

Pinout & Package

TSSOP-48 package (12.50 mm × 6.10 mm), lead pitch 0.5 mm, RoHS-compliant, surface-mount.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus transceiver applications.

Compared with SN74AVCH16T245 and TXS0108E, the 74LVCH16T245 offers balanced performance for general-purpose mixed-voltage interconnects-retaining manual DIR/OE control for deterministic timing, bus-hold for robustness in noisy industrial settings, and proven thermal behavior in TSSOP-48 packages.

Availability

74LVCH16T245 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive ADAS sensor hubs, enterprise SSD controllers, medical imaging acquisition systems, and telecom baseband modules requiring stable component supply across extended temperature and mixed-voltage operating conditions.

Supply support for 74LVCH16T245 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The SN74LVCH16T245 belongs to TI's LVCH logic family, designed specifically for robust, low-power voltage translation in systems with multiple supply domains and stringent power sequencing requirements.

FAQ

What voltage ranges does the 74LVCH16T245 support on its A and B ports?

The 74LVCH16T245 supports independent supply voltages from 1.65 V to 5.5 V on both VCCA (A port) and VCCB (B port). This allows translation between any combination of common logic families-including 1.8-V, 2.5-V, 3.3-V, and 5-V-without external components. The device guarantees correct VIH/VIL thresholds and output drive strength across the full range, as verified in TI's SCES635B datasheet Tables 7.3 and 7.5.

Does the 74LVCH16T245 require external pull-up or pull-down resistors on its data inputs?

No, the 74LVCH16T245 does not require external pull-up or pull-down resistors on its data inputs because it integrates active bus-hold circuitry on all A- and B-port I/Os. This circuitry maintains undriven inputs at valid logic HIGH or LOW states, eliminating floating nodes that could cause excessive ICC or metastability. TI explicitly advises against adding external resistors when bus-hold is enabled, as stated in Section 5 of the SCES635B datasheet.

How does the VCC isolation feature work in the 74LVCH16T245?

The VCC isolation feature in the 74LVCH16T245 ensures that if either VCCA or VCCB is driven to GND (e.g., during power-down), all outputs automatically enter a high-impedance state-regardless of DIR or OE logic levels. This behavior is implemented via internal detection circuitry and is characterized in the Electrical Characteristics table (IOZ parameter). It prevents bus contention and false signaling in systems with asymmetric power sequencing, a critical requirement in hot-swap and modular designs.

Can the 74LVCH16T245 operate with different supply voltages on VCCA and VCCB simultaneously?

Yes, the 74LVCH16T245 is explicitly designed for simultaneous dual-supply operation with mismatched VCCA and VCCB voltages-for example, VCCA = 1.8 V and VCCB = 3.3 V. Its architecture isolates input thresholds and output drive stages per port, enabling reliable level translation without level-shifter ICs or resistor networks. Switching characteristics in Sections 7.6–7.9 of the datasheet provide measured tPLH/tPHL values for all common cross-voltage combinations.

What is the maximum data rate supported by the 74LVCH16T245?

The maximum practical data rate for the 74LVCH16T245 depends on the VCCA/VCCB combination and capacitive load, but it supports up to ~200 MHz in optimal conditions (e.g., 3.3-V to 5-V translation with CL = 15 pF). This is derived from worst-case propagation delay specifications: minimum tPLH/tPHL is 0.3 ns (OE→output at 5 V), and typical values range from 4.3 ns to 23.8 ns across voltage pairs. For sustained high-speed operation, layout must minimize trace inductance and ensure clean, decoupled VCCA/VCCB supplies.