Texas Instruments SN74LVCH16T245DGVR

Overview

SN74LVCH16T245 from Texas Instruments is a 16-bit dual-supply noninverting bus transceiver with configurable level-shifting, supporting bidirectional voltage translation between 1.65 V–5.5 V domains on both A and B ports. It features independent VCCA and VCCB rails, tri-state outputs controlled by DIR/OE pins referenced to VCCA, and bus-hold circuitry eliminating external pull resistors. Used in mixed-voltage system interconnects such as 1.8-V microcontrollers interfacing 3.3-V peripherals.

For engineers reviewing the SN74LVCH16T245 datasheet, SN74LVCH16T245 pinout, SN74LVCH16T245 application, or SN74LVCH16T245 equivalent, key selection criteria include dual-rail voltage range (1.65–5.5 V), Ioff partial-power-down support, VCC isolation behavior, bus-hold input retention, and verified 200-MHz data rate capability in 3.3-V-to-5-V translation.

Technical Context

The SN74LVCH16T245 implements two independent 8-bit transceiver blocks (1A/1B and 2A/2B), each with direction-control (DIR) and output-enable (OE) inputs referenced to VCCA. Data paths are fully bidirectional: high DIR enables A→B transmission; low DIR enables B→A transmission; high OE forces both ports into high-impedance state regardless of DIR.

Its dual-rail architecture decouples A-port logic levels (tracked to VCCA) from B-port levels (tracked to VCCB), enabling simultaneous operation across mismatched supply domains. Bus-hold circuitry actively maintains undriven A/B data inputs at valid logic states without external components, while Ioff limits backflow current when either VCCA or VCCB is powered down.

Key Specifications

Pinout & Package

SN74LVCH16T245 is packaged in a 48-pin TVSOP (DGV) with nominal body size 9.70 mm × 4.40 mm, lead pitch 0.4 mm, and exposed pad not present. Pin numbering follows standard top-view orientation with Pin 1 at bottom-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVCH16T245 and TXB0108, the SN74LVCH16T245 offers optimal balance of 16-bit width, explicit direction control, and broad 1.65–5.5-V compatibility-making it preferred for deterministic, high-channel-count industrial and telecom backplanes where manual DIR management is acceptable and voltage flexibility is critical.

Availability

SN74LVCH16T245 is available at Aetrix Electronics and suitable for industrial automation, enterprise storage, and medical imaging systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SN74LVCH16T245 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 for industrial, automotive, personal electronics, and communications markets.

The SN74LVCH16T245 belongs to TI's LVCH logic family, designed specifically for robust, low-power voltage translation in mixed-supply systems where reliability, wide operating range, and Ioff safety are mandatory.

FAQ

What voltage ranges does the SN74LVCH16T245 support on its A and B ports?

The SN74LVCH16T245 supports 1.65 V to 5.5 V independently on both VCCA (A port) and VCCB (B port). This allows translation between any combination of 1.8-V, 2.5-V, 3.3-V, and 5-V logic domains. Control inputs (1DIR, 2DIR, 1OE, 2OE) are always referenced to VCCA, so their VIH/VIL thresholds scale with VCCA-not VCCB.

How does the VCC isolation feature work in the SN74LVCH16T245?

The VCC isolation feature in the SN74LVCH16T245 ensures that if either VCCA or VCCB is driven to GND, all outputs on both A and B ports enter a high-impedance state. This prevents bus contention or false logic levels during power-up, power-down, or fault conditions. The behavior is inherent to the internal circuitry and requires no external configuration-verified in Electrical Characteristics as IOZ specification.

Can the SN74LVCH16T245 operate with different supply voltages on VCCA and VCCB simultaneously?

Yes-the SN74LVCH16T245 is explicitly designed for asymmetric dual-supply operation. For example, it can translate from a 1.8-V microcontroller (VCCA = 1.8 V) to a 3.3-V peripheral (VCCB = 3.3 V) in A→B mode, or vice versa in B→A mode. All timing and DC specifications in the datasheet are characterized across matched and mismatched VCCA/VCCB pairs.

Does the SN74LVCH16T245 require external pullup or pulldown resistors on its data lines?

No. The SN74LVCH16T245 integrates active bus-hold circuitry on all A- and B-port data inputs (1A1–1A8, 1B1–1B8, 2A1–2A8, 2B1–2B8), which maintains undriven inputs at valid logic HIGH or LOW states. TI explicitly states that external pullup/pulldown resistors are not recommended when bus-hold is enabled, as they may conflict with the internal retention current.

What is the maximum data rate supported by the SN74LVCH16T245 in practical designs?

The SN74LVCH16T245 supports up to 200 MHz in 3.3-V-to-5-V translation (VCCA = 5 V, VCCB = 3.3 V), based on worst-case propagation delay (tPLH/tPHL ≤ 4.3 ns) and load conditions defined in the datasheet. Real-world performance depends on PCB layout, capacitive loading (<15 pF), and supply stability-but the device is fully characterized and guaranteed for this rate under recommended operating conditions.