NXP Semiconductors 74LVCH322245AEC

Overview

74LVCH322245AEC from NXP Semiconductors is a 32-bit non-inverting 3-state bus transceiver with integrated 30 Ω series termination resistors, four independent direction (nDIR) and output enable (nOE) controls, and 5 V tolerant I/O for mixed-voltage interfacing between 1.2 V–3.6 V logic and 5 V systems. It supports bidirectional data flow across four 8-bit channels in high-speed memory or peripheral buses.

For engineers reviewing the 74LVCH322245AEC datasheet, 74LVCH322245AEC pinout, 74LVCH322245AEC application, or 74LVCH322245AEC equivalent, key selection criteria include its LFBGA96 package, −40 °C to +85 °C industrial temperature range, bus hold on all data inputs, 3.3 ns typical propagation delay at 3.3 V, and 5.5 V-tolerant outputs in 3-state mode.

Technical Context

The 74LVCH322245AEC implements four independent 8-bit transceiver sections, each with dedicated nDIR (active-HIGH direction control) and nOE (active-LOW output enable) pins, enabling flexible cascading and per-channel isolation. Its CMOS design operates from 1.2 V to 3.6 V supply while accepting input voltages up to 5.5 V and tolerating 5.5 V on outputs when disabled.

Each I/O port integrates bus hold circuitry eliminating external pull-ups, and both HIGH/LOW output stages embed 30 Ω series termination resistors to suppress transmission line reflections and reduce ground bounce. The device complies with JEDEC JESD8-B/JESD36 and meets HBM ESD >2000 V and MM ESD >200 V.

Key Specifications

Pinout & Package

74LVCH322245AEC is packaged in a plastic low-profile fine-pitch ball grid array (LFBGA96) with 96 solder balls in a 13.5 mm × 5.5 mm × 1.05 mm body (SOT536-1). The package features multiple VCC and GND balls distributed across the array to minimize power delivery impedance and ground bounce.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 32-bit bus transceiver applications.

Compared with SN74LVC32245PAG, the 74LVCH322245AEC delivers superior noise immunity via integrated termination and broader voltage interoperability; versus 74ALVCH32245AEC, it trades 0.8 ns speed for wider 1.2 V–3.6 V operation and enhanced 5 V tolerance.

Availability

74LVCH322245AEC is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, FPGA-based test equipment, and high-density memory subsystems requiring stable component supply across extended temperature ranges and mixed-voltage interfaces.

Supply support for 74LVCH322245AEC 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The 74LVCH322245AEC belongs to NXP's LVCH family of advanced CMOS bus interface ICs, designed specifically for noise-sensitive, high-speed digital systems requiring robust voltage translation and signal integrity in compact packages.

FAQ

What is the maximum supply voltage for the 74LVCH322245AEC?

The absolute maximum supply voltage (VCC) for the 74LVCH322245AEC is +6.5 V, but the recommended operating range is 1.2 V to 3.6 V. Operation outside this range may cause permanent damage or unpredictable behavior. The device is rated for continuous operation at 3.6 V, and exceeding 3.6 V voids guaranteed performance specifications including propagation delay and output drive strength.

Does the 74LVCH322245AEC support hot insertion into a live 5 V bus?

Yes - the 74LVCH322245AEC supports hot insertion when powered down or in 3-state mode: outputs tolerate up to 5.5 V regardless of VCC state, and inputs accept voltages up to 5.5 V. However, VCC must be ramped before applying signals to avoid latch-up. The device's power-off leakage current (IOFF ≤ ±10 µA at VI/VO = 5.5 V) ensures minimal disturbance to the live bus during insertion.

How does the bus hold feature work on the 74LVCH322245AEC?

The 74LVCH322245AEC implements active bus hold on all data inputs (A[0:7] and B[0:7] groups), using internal feedback circuits that maintain the last valid logic state when inputs float. At VCC = 3.0 V, it sources/sinks ±75 µA to hold LOW/HIGH states, eliminating external pull resistors. Control inputs (nDIR, nOE) do not have bus hold, per datasheet Table 6 footnote [4].

Can the 74LVCH322245AEC replace the 74LVC32245 in an existing LFBGA96 design?

No - the 74LVCH322245AEC is not a drop-in replacement for the 74LVC32245. While both are 32-bit transceivers in LFBGA96, the 74LVCH322245AEC adds integrated 30 Ω termination, bus hold, and extended 1.2 V–3.6 V operation. Pin functions match, but electrical behavior differs: the 74LVCH322245AEC has lower drive strength at 3.6 V and different timing margins. Layout reuse is possible, but validation of signal integrity and timing closure is required.

What is the thermal resistance (θJA) of the 74LVCH322245AEC in its LFBGA96 package?

The datasheet does not specify θJA for the 74LVCH322245AEC. However, based on NXP's SOT536-1 (LFBGA96) package characterization for similar devices, typical θJA is ~45 °C/W with standard 2-layer PCB copper (1 oz, 1 in² exposed pad area). For precise thermal modeling, users should refer to NXP Application Note AN10367 or perform board-specific simulation using the 13.5 mm × 5.5 mm footprint and 1.05 mm height.