Texas Instruments 74LVCH16245ADGGRG4

Overview

74LVCH16245ADGGRG4 from Texas Instruments is a 16-bit dual-octal noninverting bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between 1.65–3.6 V buses. It supports mixed-mode signaling (5.5 V-tolerant inputs at 3.3 V VCC), delivers 4 ns max propagation delay at 3.3 V, and features Ioff for live insertion and bus-hold circuitry eliminating external pull resistors. It is used in tablet memory expansion interfaces requiring level translation and isolation.

For engineers reviewing the 74LVCH16245ADGGRG4 datasheet, 74LVCH16245ADGGRG4 pinout, 74LVCH16245ADGGRG4 application, or 74LVCH16245ADGGRG4 equivalent, key selection criteria include its 48-pin TSSOP package, dual-direction control per octet (1DIR/2DIR), independent output enables (1OE/2OE), and guaranteed 5.5 V input tolerance across full VCC range (1.65–3.6 V).

Technical Context

The 74LVCH16245ADGGRG4 implements two independent 8-bit transceiver sections, each with dedicated direction (DIR) and output-enable (OE) controls. Its CMOS-based input circuitry remains active regardless of OE state, enabling bus-hold functionality on all A- and B-port I/Os to maintain valid logic levels on undriven lines.

It supports partial-power-down operation via Ioff, blocking current flow when VCC = 0 V, and allows safe 5.5 V signal injection on any input while powered from 1.65–3.6 V - critical for interoperability between 3.3 V system logic and 5 V peripherals in wearables and POS terminals.

Key Specifications

Pinout & Package

TSSOP-48 (DGG) package, 12.50 mm × 6.10 mm body size, lead-free (NiPdAu), moisture sensitivity level 1, rated for –40°C to +125°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16245ADGGR and 74ALVC16245PW,118, the 74LVCH16245ADGGRG4 uniquely combines 5.5 V input tolerance, integrated bus-hold, and Ioff in a single 48-pin TSSOP package - making it the only option among the three that supports true mixed-voltage hot-swap operation without external components.

Availability

74LVCH16245ADGGRG4 is available at Aetrix Electronics and suitable for electronic points of sale, test and measurement instrumentation, and wearable health devices requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74LVCH16245ADGGRG4 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 and embedded processing solutions, with leadership in interface, power management, and logic ICs for industrial, automotive, and consumer markets.

The 74LVCH16245ADGGRG4 belongs to TI's Widebus™ family of advanced CMOS logic devices, engineered specifically for high-speed, low-voltage bidirectional data transfer in mixed-signal and multi-rail embedded systems.

FAQ

What is the maximum input voltage rating for 74LVCH16245ADGGRG4?

The 74LVCH16245ADGGRG4 supports input voltages up to 5.5 V across its entire VCC operating range (1.65–3.6 V). This overvoltage tolerance is specified in the Absolute Maximum Ratings table and confirmed in the Features section of the SCES495C datasheet. It enables direct interfacing with 5 V logic without external clamping diodes or level shifters, and applies to all A- and B-port I/O pins as well as DIR and OE control inputs.

Does 74LVCH16245ADGGRG4 support hot-plug or partial-power-down operation?

Yes, the 74LVCH16245ADGGRG4 includes an Ioff feature that disables output buffers and blocks current backflow when VCC = 0 V. This is explicitly documented in the Features and Detailed Description sections of the datasheet and verified in the Electrical Characteristics table (Ioff ≤ ±10 µA at VI or VO = 5.5 V). It allows safe insertion or removal in powered-backplane systems such as modular test equipment and industrial controllers.

How does bus-hold functionality work on 74LVCH16245ADGGRG4?

The 74LVCH16245ADGGRG4 integrates active bus-hold circuitry on all A- and B-port I/O pins, maintaining valid logic states on undriven or floating inputs without external resistors. Per the datasheet, bus-hold current is ±45 µA at 3 V, and the feature remains active regardless of OE or DIR state. It is implemented as part of the input structure and cannot be disabled - eliminating BOM cost and PCB space required for pull-up/pull-down networks in portable and high-density designs.

What is the propagation delay specification for 74LVCH16245ADGGRG4 at 3.3 V?

The maximum propagation delay (tpd) for the 74LVCH16245ADGGRG4 is 4 ns at VCC = 3.3 V, TA = 25°C, as specified in the Switching Characteristics table (Section 7.6) of SCES495C. This value applies to both A→B and B→A data paths under load conditions of CL = 50 pF and ΔV = ±0.3 V. Typical tpd is 1 ns, and the parameter is characterized across temperature (–40°C to 125°C) and voltage (1.65–3.6 V), ensuring timing predictability in real-world embedded applications.

Which package type does 74LVCH16245ADGGRG4 use, and what are its mechanical dimensions?

The 74LVCH16245ADGGRG4 uses a 48-pin TSSOP package (package code DGG), with nominal body dimensions of 12.50 mm × 6.10 mm and 0.5 mm lead pitch. This information is confirmed in the Device Information table (Section 3) and Packaging Information addendum of the SCES495C datasheet. The "G4" suffix denotes RoHS-compliant, lead-free NiPdAu finish and moisture sensitivity level 1 (MSL-1, unlimited floor life at <30°C/60% RH).