Texas Instruments 74LVCR162245ZQLR

Overview

74LVCR162245ZQLR from Texas Instruments is a 16-bit dual-octal noninverting bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between 2.7-V to 3.6-V buses. It supports 5.5-V-tolerant inputs, features integrated 26-Ω output series resistors, and includes active bus-hold circuitry on all data inputs - eliminating external pullup/pulldown resistors in point-to-point or stub-bus applications such as memory expansion interfaces.

For engineers reviewing the 74LVCR162245ZQLR datasheet, 74LVCR162245ZQLR pinout, 74LVCR162245ZQLR application, or 74LVCR162245ZQLR equivalent, key selection considerations include its 8.5 ns max propagation delay at 3.3 V, 12 mA output drive capability, 2.7–3.6 V supply range, and ZQL-packaged 48-pin VFBGA footprint optimized for high-density PCB layouts.

Technical Context

This device implements two independent 8-bit transceivers (A↔B), each controlled by dedicated DIR and OE signals. Direction control is level-sensitive: DIR = L enables B→A flow; DIR = H enables A→B flow. Output enable (OE) is active-low and overrides direction control to place all outputs in high-impedance state.

Bus-hold circuitry is embedded on every A- and B-port input, maintaining valid logic levels on floating or unused lines without external biasing. All outputs integrate 26-Ω series termination resistors to suppress overshoot/undershoot, enabling direct connection to transmission lines or stubs without discrete termination components.

Key Specifications

Pinout & Package

VFBGA package (ZQL), 48-pin, 3.5 mm × 4.5 mm, 0.5 mm pitch, bottom-side ball layout with exposed thermal pad. Pin 1 located at corner A2 per JEDEC MO-191 standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16245ADGGR and 74ALVC162245PW, the 74LVCR162245ZQLR uniquely combines 5.5-V-tolerant inputs, integrated 26-Ω termination, and active bus-hold in a compact VFBGA - reducing component count, improving signal integrity, and enhancing reliability in high-density or hot-swap systems.

Availability

74LVCR162245ZQLR is available at Aetrix Electronics and suitable for memory expansion interfaces, FPGA-to-ASIC bridging, industrial PLC backplanes, test equipment signal routing, and high-density embedded bus isolation requiring stable component supply and long-term lifecycle support.

Supply support for 74LVCR162245ZQLR 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 74LVCR162245ZQLR belongs to TI's Widebus™ family of advanced bus interface devices, engineered specifically for low-voltage, high-speed bidirectional data transfer in space-constrained, noise-sensitive industrial and communications systems.

FAQ

What is the recommended power-up sequence for the 74LVCR162245ZQLR?

TI recommends tying OE to VCC through a pullup resistor (minimum value determined by driver sink capability) to ensure outputs remain in high-impedance state during power ramp. For 74LVCR162245ZQLR, this prevents bus contention before system controllers initialize DIR and OE. VCC should stabilize before applying input signals; no strict sequencing between DIR and OE is required once VCC is nominal.

Does the 74LVCR162245ZQLR support hot-swap operation?

Yes - the 74LVCR162245ZQLR supports hot-swap due to its bus-hold circuitry (maintaining valid logic on floating inputs) and high-impedance OE control. During insertion, OE can be held high until configuration completes. Its ±250 mA latch-up immunity and 2000-V HBM ESD rating further enhance robustness in live-backplane environments where 74LVCR162245ZQLR is commonly deployed.

Can the 74LVCR162245ZQLR be used for level translation between 3.3-V and 5-V logic?

The 74LVCR162245ZQLR accepts inputs up to 5.5 V while operating from a 2.7–3.6 V supply, enabling reliable 5-V-to-3.3-V level down-translation on all A/B port inputs. However, its outputs swing only from GND to VCC (max 3.6 V), so it does not provide 3.3-V-to-5-V level up-translation. For bidirectional translation, external circuitry or a dedicated level shifter is required - the 74LVCR162245ZQLR itself functions as a unidirectional translator in the high-to-low direction.

How does the bus-hold feature interact with the output-enable (OE) signal in the 74LVCR162245ZQLR?

Bus-hold in the 74LVCR162245ZQLR is part of the input circuitry and remains fully active regardless of OE or DIR state - it holds unused A/B port inputs at valid logic levels even when outputs are disabled. This behavior is confirmed in TI's datasheet SCES047E: "The bus-hold circuitry is part of the input circuit and is not disabled by OE or DIR." Thus, 74LVCR162245ZQLR maintains deterministic input states during power-down, reset, or isolation modes.

What is the thermal performance of the 74LVCR162245ZQLR in its ZQL package?

The ZQL package (VFBGA) has a junction-to-ambient thermal impedance (θJA) of 42°C/W, significantly lower than DL (63°C/W) or DGG (70°C/W) variants. At full 16-bit switching with 12 mA per output and 3.3 V supply, typical power dissipation is ~120 mW - resulting in ~5°C junction rise above ambient. TI recommends using the exposed thermal pad per layout guidelines to maintain safe operation below 125°C junction temperature under continuous load.