Texas Instruments SN74LVCZ16245ADGG

Overview

SN74LVCZ16245ADGG from Texas Instruments is a 16-bit noninverting bus transceiver with 3-state outputs, designed for 2.7 V to 3.6 V operation, supporting mixed-mode signaling (5-V inputs with 3.3-V V_CC), and delivering max t_pd of 3.7 ns at 3.3 V. It enables bidirectional data flow between A and B buses in industrial backplanes and FPGA-to-ASIC interconnects.

For engineers reviewing the SN74LVCZ16245ADGG datasheet, SN74LVCZ16245ADGG pinout, SN74LVCZ16245ADGG application, or SN74LVCZ16245ADGG equivalent, key selection criteria include I_off-enabled hot insertion support, 5.5-V tolerant inputs, 48-pin TSSOP (DGG) package thermal performance (θ_JA = 70°C/W), and dual-octal configuration flexibility.

Technical Context

This device implements asynchronous bidirectional bus translation using two independent 8-bit sections, each controlled by dedicated DIR and OE inputs. Its I_off circuitry disables outputs during power-down to prevent current backflow, while power-up 3-state logic ensures high-impedance outputs when V_CC is below 1.5 V.

The SN74LVCZ16245ADGG supports mixed-voltage system interfacing: inputs accept up to 5.5 V regardless of V_CC, enabling direct connection to 5-V logic while operating at 3.3 V. Latch-up immunity exceeds 100 mA per JESD 78 Class II, and ESD protection meets 2000-V HBM and 1000-V CDM standards.

Key Specifications

Pinout & Package

TSSOP-48 (DGG) package: 48-pin thin shrink small-outline package, 12.6 mm × 6.1 mm body, 1.2 mm max height, 0.5 mm pitch, JEDEC MO-153 compliant, lead-free (NiPdAu), MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVCZ16245ADGG, SN74LVC16245ADGGR lacks I_off protection and requires careful power sequencing, while 74ALVC16245PW offers equivalent functionality with minor thermal and reliability validation overhead.

Availability

SN74LVCZ16245ADGG is available at Aetrix Electronics and suitable for industrial backplanes, FPGA-to-ASIC bridges, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVCZ16245ADGG 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 specializing in analog, embedded processing, and connectivity technologies, with decades of experience in high-reliability logic and interface solutions.

The SN74LVCZ16245ADGG belongs to TI's Widebus™ family of advanced bus interface devices, engineered specifically for robust, low-latency bidirectional data transfer in mixed-voltage industrial and automotive systems.

FAQ

What is the maximum clock frequency supported by SN74LVCZ16245ADGG in a synchronous bus application?

The SN74LVCZ16245ADGG is an asynchronous transceiver with no internal clock; its usable data rate depends on propagation delay and system timing margins. With a max t_pd of 3.7 ns at 3.3 V and typical setup/hold times under 1 ns, it supports reliable operation in parallel buses running up to ~135 MHz (assuming 7.4 ns round-trip delay budget). System-level timing must account for trace delays and loading - the SN74LVCZ16245ADGG itself does not impose a hard clock limit.

Can SN74LVCZ16245ADGG safely interface a 5-V microcontroller with a 3.3-V FPGA without external level shifters?

Yes. The SN74LVCZ16245ADGG accepts input voltages up to 5.5 V while operating from a 2.7–3.6 V V_CC, making it ideal for direct 5-V-to-3.3-V translation. Its outputs swing rail-to-rail (0 V to V_CC), so when V_CC = 3.3 V, it delivers clean 3.3-V logic levels compatible with FPGA I/O banks. No external components are needed - the SN74LVCZ16245ADGG handles both voltage translation directions natively.

Does SN74LVCZ16245ADGG require pull-up resistors on OE or DIR inputs for proper power-up behavior?

OE should be tied to V_CC via a pull-up resistor (minimum value determined by driver sink capability) to guarantee high-impedance outputs above 1.5 V V_CC; the SN74LVCZ16245ADGG enters 3-state automatically below 1.5 V. DIR has no power-up default - it must be actively driven or pulled to a defined logic level (high or low) to avoid undefined bus direction. Leaving DIR floating risks bus contention; the SN74LVCZ16245ADGG does not internally bias this input.

How does the I_off feature of SN74LVCZ16245ADGG protect the system during hot insertion?

The I_off circuitry in the SN74LVCZ16245ADGG disables all outputs when V_CC = 0 V, blocking reverse current flow from live backplane traces into the unpowered device. This prevents damage to upstream drivers and avoids bus contention that could crash connected controllers. Unlike standard 3-state, I_off operates independently of OE/DIR states - the SN74LVCZ16245ADGG remains electrically isolated even if control pins float during insertion.

Is SN74LVCZ16245ADGG pin-compatible with older SN74LVCH16245A or SN74LVC16245A variants?

Yes - the SN74LVCZ16245ADGG shares identical pinout, package dimensions (TSSOP-48 DGG), and electrical interface with SN74LVC16245A and SN74LVCH16245A. However, SN74LVCZ16245ADGG adds I_off and enhanced hot-insertion features not present in those predecessors. Functionally, it is a drop-in upgrade where robustness during live insertion is required; no PCB changes are needed to replace SN74LVC16245ADGGR with SN74LVCZ16245ADGG.