Texas Instruments SN74LVCH16T245DLR

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 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 compatibility (1.65–5.5 V per port), Ioff-enabled partial-power-down operation, VCC isolation behavior, bus-hold input retention, and propagation delays under varying VCCA/VCCB combinations (e.g., tPLH ≤ 4.4 ns at 5 V → 5 V).

Technical Context

The SN74LVCH16T245 implements two independent 8-bit transceiver channels (1A↔1B and 2A↔2B), each with direction control (1DIR/2DIR) and output-enable (1OE/2OE) inputs referenced to VCCA. Its dual-rail architecture enables asynchronous level translation without clocking or timing constraints - data flows transparently when enabled, with no internal latching or synchronization.

Input circuits on both A and B ports remain active regardless of OE state, requiring defined logic levels to avoid excess ICC/ICCZ. The VCC isolation feature forces high-impedance outputs if either VCCA or VCCB is at GND, while bus-hold circuitry actively maintains undriven data inputs at valid logic states without external biasing.

Key Specifications

Pinout & Package

SN74LVCH16T245 is packaged in a 48-pin TSSOP (DGG) with 0.5-mm pitch, body size 12.50 mm × 6.10 mm. Pin numbering follows standard JEDEC top-view convention.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVCH16T245 and TXB0108PWR, the SN74LVCH16T245 provides wider voltage flexibility (1.65–5.5 V on both rails), explicit DIR/OE control for predictable bus arbitration, and higher drive capability (±32 mA), making it optimal for industrial and telecom systems demanding robust mixed-voltage interoperability.

Availability

SN74LVCH16T245 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive infotainment gateways, enterprise SSD controllers, and telecom baseband FPGA interconnects requiring stable component supply, long-term lifecycle assurance, and 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 specializing in analog, embedded processing, and connectivity technologies with over 90 years of innovation in industrial, automotive, and communications markets.

The SN74LVCH16T245 belongs to TI's LVCMOS-compatible level-shifting transceiver product line, designed specifically for robust, low-power bidirectional voltage translation in mixed-supply systems where rail independence, power sequencing safety, and bus-hold reliability are critical.

FAQ

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

The SN74LVCH16T245 supports 1.65 V to 5.5 V on both VCCA (A port) and VCCB (B port) supplies. 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 referenced to VCCA, so VCCA must be present for functional operation. The SN74LVCH16T245 datasheet specifies absolute maximum ratings up to 6.5 V, but recommended operation remains within 1.65–5.5 V per rail.

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 (0 V), all outputs on both A and B ports enter a high-impedance state. This behavior is guaranteed per the Electrical Characteristics table (IOZ parameter) and prevents false logic levels or bus contention during power-up, power-down, or fault conditions. It requires no external circuitry and operates inherently - the SN74LVCH16T245 enforces isolation even if OE is low or DIR is asserted.

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

No, the SN74LVCH16T245 integrates active bus-hold circuitry on all data I/O pins (1A1–1A8, 1B1–1B8, 2A1–2A8, 2B1–2B8), which maintains undriven inputs at valid logic HIGH or LOW states without external resistors. TI explicitly advises against using pullup/pulldown resistors with bus-hold enabled, as they may conflict with the internal sustaining current (IBHL/IBHH). This feature directly reduces BOM cost and PCB footprint in the SN74LVCH16T245 design.

What is the maximum data rate supported by the SN74LVCH16T245?

The maximum data rate of the SN74LVCH16T245 is determined by its worst-case propagation delay. At VCCA = VCCB = 5 V, tPLH/tPHL is specified at 4.4 ns max, supporting theoretical data rates up to ~227 MHz for single-ended signals. Real-world throughput depends on load capacitance and signal integrity; the SN74LVCH16T245 datasheet confirms 200 MHz operation in 3.3-V-to-5-V translation with CL = 15 pF. For higher reliability, derate based on measured tPLH under actual board conditions.

Can the SN74LVCH16T245 operate with VCCA = 3.3 V and VCCB = 1.8 V in both directions?

Yes, the SN74LVCH16T245 fully supports bidirectional translation between VCCA = 3.3 V and VCCB = 1.8 V. When 1DIR = HIGH and 1OE = LOW, data flows from 3.3-V A-port inputs to 1.8-V B-port outputs; when 1DIR = LOW and 1OE = LOW, data flows from 1.8-V B-port inputs to 3.3-V A-port outputs. Propagation delays are asymmetric (e.g., tPLH A→B = 6.2 ns, B→A = 8.9 ns at these rails), but both paths are fully characterized and functional in the SN74LVCH16T245 datasheet.