onsemi 74LCXP16245MTD

Overview

74LCXP16245MTD from Fairchild Semiconductor is a low-voltage 16-bit bidirectional transceiver with 5V-tolerant I/O, built-in 30 kΩ pull-down resistors, and 3-STATE outputs. It operates from 2.3V to 3.6V V_CC, delivers ≤5.5 ns propagation delay at 3.3V, supports ±24 mA output drive, and is designed for bus interface between mixed-voltage domains (e.g., 3.3V logic interfacing to 5V peripherals).

For engineers reviewing the 74LCXP16245MTD datasheet, pinout, applications, or equivalent options, key selection criteria include 5V-tolerant I/O compatibility, byte-level direction control (T/R), dual OE inputs for per-byte 3-STATE enable, integrated pull-downs eliminating external resistors, and TSSOP-48 packaging for space-constrained PCB layouts.

Technical Context

The 74LCXP16245MTD implements two independent 8-bit bidirectional data paths (A0–A7/B0–B7 and A8–A15/B8–B15), each controlled by dedicated OE and T/R inputs. Direction is determined by T/R state (L = B→A, H = A→B), while OE=L enables data flow and OE=H forces both ports into high-impedance.

Its 30 kΩ internal pull-down resistors activate only when outputs are in 3-STATE (OE=H), ensuring stable bus termination without external components. The device uses advanced CMOS to achieve 5.5 ns t_PHL/t_PLH at 3.3V while maintaining ≤20 µA ICC quiescent current.

Key Specifications

Pinout & Package

74LCXP16245MTD is housed in a 48-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 6.1 mm wide, with 0.5 mm lead pitch. Pin 1 marked via notch or dot; thermal pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LCXP16245MTD, the 74ALVC16245PAG supports lower V_CC but adds BOM complexity, while the SN74LVC16245ADGGR trades integrated termination for tighter DC specs - making 74LCXP16245MTD optimal for space-constrained, modular designs requiring guaranteed bus stability without external components.

Availability

74LCXP16245MTD is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, memory module interposers, PCI bus bridging, and ATE signal routing requiring stable component supply and long-term obsolescence mitigation.

Supply support for 74LCXP16245MTD 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

Fairchild Semiconductor was a U.S.-based analog and power IC manufacturer, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and communications infrastructure.

The 74LCXP16245MTD belongs to the LCX low-voltage CMOS logic family, engineered specifically for mixed-voltage system interfacing with emphasis on 5V-tolerant I/O, low static power, and space-efficient integration in bus-oriented applications.

FAQ

What voltage levels can the 74LCXP16245MTD safely interface between?

The 74LCXP16245MTD accepts input voltages from 0V to 5.5V on all A and B port pins while operating from a 2.3V–3.6V V_CC. This allows direct connection to 5V logic, EEPROMs, or legacy peripherals without external level-shifting circuitry. Its 5V tolerance is inherent to the I/O structure, not dependent on external components, and is validated across the full operating temperature range (–40°C to +85°C). The 74LCXP16245MTD maintains full functionality and timing compliance under these mixed-voltage conditions.

How do the built-in pull-down resistors function in the 74LCXP16245MTD?

The 74LCXP16245MTD integrates 30 kΩ pull-down resistors on all A and B port pins, active only when the outputs are in 3-STATE (i.e., when OE = HIGH). During active driving (OE = LOW), the resistors are disconnected from the I/O path. This design ensures stable LOW states on idle buses without consuming extra PCB area or increasing BOM count. The 74LCXP16245MTD's pull-downs eliminate floating inputs that could cause undefined logic states or increased EMI in modular or densely packed systems.

Can the 74LCXP16245MTD be used for hot-plug applications?

Yes - the 74LCXP16245MTD supports live insertion/withdrawal when OE is tied to V_CC via an appropriate pull-up resistor (value determined by driver strength). During power-up or power-down, this configuration forces both A and B ports into high-impedance, preventing bus contention or back-driving. The 74LCXP16245MTD's power-down high-impedance inputs and outputs, combined with its 5V-tolerant structure, make it suitable for hot-swap backplane and modular I/O card applications.

What is the maximum data rate supported by the 74LCXP16245MTD?

The 74LCXP16245MTD achieves ≤5.5 ns propagation delay (t_PHL/t_PLH) at V_CC = 3.3V, supporting reliable operation in 33 MHz PCI bus environments and other high-speed parallel interfaces. Its <1 ns output-to-output skew ensures deterministic timing alignment across all 16 bits. While not specified as a serial data rate, the 74LCXP16245MTD's AC characteristics confirm suitability for burst-mode parallel transfers up to ~100 Mbps per bit, assuming proper PCB layout and termination.

Is the 74LCXP16245MTD pin-compatible with standard 74-series transceivers?

Yes - the 74LCXP16245MTD is explicitly designed for pinout compatibility with industry-standard 74-series 16245 devices, including the 74AC16245 and 74ALVC16245. Its TSSOP-48 (MTD48) package matches the pin assignment of those families, allowing drop-in replacement in existing layouts where voltage and timing requirements align. However, users must verify that the 5V-tolerant I/O and integrated pull-downs of the 74LCXP16245MTD do not conflict with legacy design assumptions.