NXP Semiconductors 74LVCH322244AEC:55

Overview

The 74LVCH322244AEC from NXP Semiconductors is a 32-bit non-inverting buffer/line driver with 3-state outputs, designed for bus interface and signal isolation in mixed-voltage systems. It features integrated 30 Ω series termination resistors, 5 V tolerant I/O, bus hold on all data inputs, and operates from 1.2 V to 3.6 V supply. It is used in high-speed digital backplanes and memory expansion modules requiring noise suppression and voltage-level translation.

For engineers reviewing the 74LVCH322244AEC datasheet, 74LVCH322244AEC pinout, 74LVCH322244AEC application, or 74LVCH322244AEC equivalent, key selection criteria include its LFBGA96 package, −40 °C to +85 °C temperature range, 3-state enable timing (t_en ≤ 7.5 ns at 3.3 V), and 5 V tolerance enabling interoperability with legacy TTL and 5 V peripherals.

Technical Context

This device implements eight independent 4-bit non-inverting buffers, each with dedicated active-low 3-state output enable (nOE). Each buffer group drives four outputs with matched propagation delay (t_pd ≤ 5.8 ns at 3.3 V) and low skew (≤1.5 ns).

Its 30 Ω on-die series termination reduces ringing and EMI on transmission lines, while bus hold circuitry eliminates external pull-ups on unused data inputs. Input thresholds comply with JEDEC JESD8-7A, JESD8-5A, and JESD8-C standards across 1.65–3.6 V operation.

Key Specifications

Pinout & Package

Package: LFBGA96 (SOT536-1), plastic low-profile fine-pitch ball grid array; 96 balls; body size 13.5 × 5.5 × 1.05 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 32-bit buffer/line driver applications.

Compared with SN74LVC32244PAG and 74ALVC32244BQ, the 74LVCH322244AEC uniquely combines LFBGA96 packaging, integrated 30 Ω termination, and industrial −40 °C to +85 °C rating-making it optimal for space-constrained, noise-sensitive, high-reliability industrial bus interfaces.

Availability

The 74LVCH322244AEC is available at Aetrix Electronics and suitable for memory expansion interfaces, industrial backplane buses, legacy peripheral bridges, and high-density data acquisition systems requiring stable component supply and long-term production continuity.

Supply support for 74LVCH322244AEC 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The 74LVCH322244AEC belongs to NXP's LVCH logic family, engineered for low-voltage, high-speed, mixed-signal interfacing in industrial and communications infrastructure where noise immunity, voltage translation, and compact packaging are critical.

FAQ

What is the maximum supply voltage rating for the 74LVCH322244AEC?

The absolute maximum supply voltage (V_CC) for the 74LVCH322244AEC is +6.5 V, but recommended operation is limited to 1.2 V to 3.6 V. Exceeding 3.6 V during normal operation risks violating JEDEC compliance and may degrade reliability. The 5 V I/O tolerance applies only to input/output pins-not the V_CC rail-so V_CC must remain within specification even when driving or receiving 5 V signals. Always refer to Table 4 (Limiting Values) and Table 5 (Recommended Operating Conditions) in the official NXP datasheet for safe design margins.

Does the 74LVCH322244AEC require external pull-up resistors on its nOE inputs?

Yes-the 74LVCH322244AEC requires external pull-up resistors on all eight nOE inputs to ensure high-impedance outputs during power-up or power-down. The datasheet specifies that nOE should be tied to V_CC through a pull-up resistor, with minimum value determined by the current-sinking capability of the driving source. This prevents unintended output activation before system initialization completes. Bus hold is present only on data inputs (A[0:3]), not on control inputs like nOE, so external biasing remains mandatory for robust power sequencing.

How does the bus hold feature work on the 74LVCH322244AEC data inputs?

The bus hold circuit on each data input (1A0–8A3) actively maintains the last-valid logic state when the input floats, eliminating need for external pull-up/down resistors. It functions via weak feedback transistors that sustain current (e.g., ±10 µA at 1.65 V) to hold VI below V_IL or above V_IH. Bus hold is disabled when VI exceeds V_CC, allowing safe 5.5 V input application. Control inputs (nOE) do not have bus hold-only the 32 data inputs are protected. This behavior is confirmed in Table 6 footnotes [3] and [4] of the NXP datasheet.

What is the purpose of the integrated 30 Ω series termination resistors in the 74LVCH322244AEC?

The integrated 30 Ω series termination resistors in the 74LVCH322244AEC are placed in both HIGH and LOW output stages to dampen signal reflections and reduce line noise on PCB traces. They match typical PCB trace impedances (e.g., 50–75 Ω) in source-series configuration, minimizing overshoot, undershoot, and ringing-especially critical in high-speed parallel buses >25 MHz. This eliminates 32 discrete external resistors, reducing BOM count, layout complexity, and potential solder joint failures. Performance is validated in Figure 4 (propagation delay) and Table 7 (dynamic characteristics).

Is the 74LVCH322244AEC pin-compatible with other members of the LVCH family?

The 74LVCH322244AEC has a unique LFBGA96 (SOT536-1) pinout optimized for flow-through routing and low-inductance power delivery, and is not mechanically or electrically pin-compatible with other LVCH variants in different packages (e.g., TSSOP or TQFP). While functional behavior matches the LVCH322244 family definition, pin mapping differs significantly-ball A1 is 1A1, whereas TQFP pin 1 is typically V_CC or GND. Substitution requires full PCB redesign. Always verify pin compatibility using the exact ordering part number and NXP's official pinout diagrams (Fig. 3 and Table 2).