Texas Instruments 74LVCH16T245DGGRE4

Overview

74LVCH16T245DGGRE4 from Texas Instruments is a 16-bit dual-supply noninverting bus transceiver with configurable level-shifting between 1.65 V–5.5 V rails, tri-state outputs, bus-hold inputs, and VCC isolation. It enables bidirectional data translation between mismatched voltage domains (e.g., 1.8 V ↔ 3.3 V) in high-speed digital interfaces. Used in mixed-voltage system interconnects where direction control and power-down safety are required.

For engineers reviewing the 74LVCH16T245DGGRE4 datasheet, 74LVCH16T245DGGRE4 pinout, 74LVCH16T245DGGRE4 application, or 74LVCH16T245DGGRE4 equivalent, key selection criteria include dual-rail voltage range (VCCA/VCCB = 1.65–5.5 V), Ioff partial-power-down support, bus-hold functionality eliminating external resistors, VCC isolation behavior, and TSSOP-48 package compatibility with industrial PCB layouts.

Technical Context

The device implements two independent 8-bit transceiver channels (1A↔1B and 2A↔2B), each controlled by dedicated DIR and OE pins referenced to VCCA. Direction logic is asynchronous: DIR = HIGH enables A→B flow; DIR = LOW enables B→A flow; OE = HIGH forces both ports into high-impedance state regardless of DIR.

VCCA and VCCB operate independently across 1.65 V–5.5 V, enabling translation between any low-voltage node (1.8 V, 2.5 V, 3.3 V, 5 V). Bus-hold circuitry actively maintains undriven A/B port inputs at valid logic levels without external biasing, 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 SN74AVCH16T245DGGR and TXB0108PWR, the 74LVCH16T245DGGRE4 uniquely balances wide voltage range (1.65–5.5 V on both rails), integrated bus-hold, and explicit DIR/OE control-making it optimal for industrial and embedded systems requiring robust power sequencing and minimal external components.

Availability

74LVCH16T245DGGRE4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive ADAS sensor hubs, and enterprise SSD controller interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for 74LVCH16T245DGGRE4 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 and embedded processing solutions, with over 90 years of innovation in precision analog, power management, and logic devices.

The SN74LVCH16T245 product line targets mixed-voltage system interconnects in industrial automation, communications infrastructure, and computing-designed specifically to simplify voltage translation without compromising reliability or timing integrity.

FAQ

What voltage ranges does the 74LVCH16T245DGGRE4 support on its VCCA and VCCB supplies?

The 74LVCH16T245DGGRE4 supports independent supply voltages from 1.65 V to 5.5 V on both VCCA and VCCB. This allows translation between any combination of common logic families-including 1.8 V ↔ 2.5 V, 1.8 V ↔ 3.3 V, 2.5 V ↔ 5 V, and 3.3 V ↔ 5 V-without external level-shifting circuitry. The 74LVCH16T245DGGRE4 datasheet specifies absolute maximum ratings up to 6.5 V, but recommended operation remains strictly within 1.65–5.5 V per rail.

Does the 74LVCH16T245DGGRE4 require external pullup or pulldown resistors on its data lines?

No, the 74LVCH16T245DGGRE4 integrates active bus-hold circuitry on all A- and B-port inputs, which maintains undriven or floating lines at valid logic HIGH or LOW states without external resistors. Using pullup or pulldown resistors with the 74LVCH16T245DGGRE4 is explicitly discouraged in the datasheet, as it may interfere with bus-hold operation and increase power consumption. The 74LVCH16T245DGGRE4's bus-hold current specification (±100 μA minimum sustaining) ensures reliable state retention across temperature and voltage ranges.

How does the VCC isolation feature work in the 74LVCH16T245DGGRE4?

The VCC isolation feature in the 74LVCH16T245DGGRE4 ensures that if either VCCA or VCCB is driven to GND (e.g., during power-down or fault conditions), all outputs automatically enter a high-impedance state-preventing bus contention or false logic injection. This behavior is hardware-enforced and requires no configuration. The 74LVCH16T245DGGRE4 achieves this through internal detection circuitry tied to each supply rail, making it ideal for systems with asymmetric power sequencing. Datasheet Section 9.3.4 confirms this is a guaranteed functional characteristic, not a recommendation.

Can the 74LVCH16T245DGGRE4 operate with different supply voltages on VCCA and VCCB simultaneously?

Yes, the 74LVCH16T245DGGRE4 is explicitly designed for simultaneous dual-supply operation with different voltages on VCCA and VCCB-such as VCCA = 1.8 V and VCCB = 3.3 V. Its architecture isolates input thresholds and output drive strength per rail, enabling true bidirectional level translation. The 74LVCH16T245DGGRE4 control inputs (1DIR, 2DIR, 1OE, 2OE) are referenced solely to VCCA, so their logic thresholds scale with VCCA-not VCCB-ensuring consistent direction and enable behavior regardless of VCCB value.

What is the maximum data rate supported by the 74LVCH16T245DGGRE4 in a typical application?

The 74LVCH16T245DGGRE4 supports data rates exceeding 20 MHz in typical configurations, based on its worst-case propagation delay of 23.8 ns (A→B, VCCA = 1.8 V, VCCB = 2.5 V). At higher supply voltages-for example, VCCA = 3.3 V and VCCB = 5 V-the maximum propagation delay drops to 4.4 ns (tPLH), enabling >100 MHz operation under light capacitive loads. The 74LVCH16T245DGGRE4's actual achievable data rate depends on load capacitance, signal integrity, and timing margins; TI's application note SCES635B provides detailed guidance for high-speed layout and termination.