Texas Instruments SN74LVCH16T245DGGR

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 supply flexibility (VCCA/VCCB = 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 channels (1A↔1B and 2A↔2B), each with dedicated DIR and OE control inputs referenced to VCCA. Directional data flow is determined by DIR state while OE enables/disables output drivers; both ports enter high-impedance when OE = HIGH. Input circuitry remains active regardless of OE state, requiring defined logic levels on all data pins to avoid excess ICCZ.

Level translation is achieved via rail-referenced I/O structures: A-port pins track VCCA (1.65–5.5 V), B-port pins track VCCB (1.65–5.5 V), enabling interoperability across 1.8-V, 2.5-V, 3.3-V, and 5-V nodes. The VCC isolation feature forces all outputs into high-impedance if either VCCA or VCCB is at GND, preventing bus contention during power sequencing.

Key Specifications

Pinout & Package

TSSOP-48 package (DGG) with 12.50 mm × 6.10 mm body size, 0.5-mm pitch, and exposed pad not present. Pin numbering follows standard TSSOP top-view convention 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 TXB0108PWR, the SN74LVCH16T245 offers optimal balance of 16-bit width, dual independent channels, robust VCC isolation, and proven reliability in industrial temperature range (–40°C to +85°C), making it preferred for parallel bus translation in mixed-voltage embedded systems.

Availability

SN74LVCH16T245 is available at Aetrix Electronics and suitable for industrial automation, automotive ADAS modules, enterprise SSD controllers, and telecom baseband designs 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 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 translation portfolio, designed specifically for reliable bidirectional voltage translation in mixed-supply systems where power sequencing, ESD robustness, and bus integrity are critical.

FAQ

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

The SN74LVCH16T245 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 domains. Each port's I/O structure is internally referenced to its respective supply rail, ensuring correct threshold tracking and noise margin preservation across the full operating range.

How does the VCC isolation feature function in the SN74LVCH16T245?

The VCC isolation feature in the SN74LVCH16T245 ensures that if either VCCA or VCCB is driven to GND, all outputs automatically enter a high-impedance state regardless of DIR or OE states. This behavior is implemented through internal monitoring circuitry and prevents bus contention or false logic assertion during power-up, power-down, or fault conditions in multi-rail systems. It is verified in the Electrical Characteristics table under IOZ parameter.

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

Yes, the SN74LVCH16T245 is explicitly designed for simultaneous dual-supply operation with different voltages on VCCA and VCCB - for example, VCCA = 1.8 V and VCCB = 3.3 V. Its architecture isolates the logic thresholds and drive strengths per port, enabling true bidirectional level translation without external components. This capability is confirmed in the Functional Description and Switching Characteristics tables across multiple VCCA/VCCB combinations.

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, which maintains a valid logic state on undriven or floating pins. Using external pullup or pulldown resistors with enabled bus-hold is explicitly discouraged in the datasheet, as it creates conflicting current paths and may degrade noise immunity or increase power consumption. Bus-hold current specifications (IBHL/IBHH) are provided in Section 7.5.

What is the maximum data rate supported by the SN74LVCH16T245 in a 3.3-V-to-5-V translation configuration?

In a 3.3-V-to-5-V translation configuration (VCCA = 3.3 V, VCCB = 5 V), the SN74LVCH16T245 achieves a maximum propagation delay (tPLH/tPHL) of 6.2 ns, supporting data rates up to 200 MHz. This value is derived from the minimum pulse width requirement (tw ≥ 2 × tpd) and is validated in the Switching Characteristics table (Section 7.8) under VCCA = 3.3 V ±0.3 V and VCCB = 5 V conditions.