onsemi 74LCXP16245MTDX

Overview

74LCXP16245MTDX 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 at 2.3–3.6 V V_CC, delivers ≤5.5 ns propagation delay at 3.3 V, supports byte-level direction control via dual T/R inputs, and is used in voltage-level-translating bus interfaces between 2.5/3.3 V logic and 5 V peripherals.

For engineers reviewing the 74LCXP16245MTDX datasheet, pinout, applications, or equivalent options, key selection criteria include 5V-tolerant I/O compatibility, integrated pull-down termination for floating-bus stability, dual-byte control flexibility, and TSSOP-48 packaging for high-density PCB layouts.

Technical Context

The 74LCXP16245MTDX 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 logic level: LOW enables B→A flow, HIGH enables A→B flow.

All I/O pins feature 5V tolerance across 2.3–3.6 V V_CC, and internal 30 kΩ pull-down resistors activate only during 3-STATE (OE = HIGH) to prevent floating bus states without external components. Propagation delay is guaranteed ≤5.5 ns at 3.3 V with 50 pF load.

Key Specifications

Pinout & Package

74LCXP16245MTDX is packaged in a 48-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 6.1 mm wide, with 0.5 mm lead pitch and exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LCXP16245MTDX, the 74LVC16245ADGG reduces quiescent current but increases BOM complexity, while the SN74AVC16245DGGR extends voltage range and ESD robustness at the expense of integrated termination-making 74LCXP16245MTDX optimal for space-limited, 2.5/3.3 V–to–5 V bridging where bus stability is non-negotiable.

Availability

74LCXP16245MTDX is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded memory expansion modules, and automotive body control gateways requiring stable component supply and long-term obsolescence management.

Supply support for 74LCXP16245MTDX 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; known for high-reliability logic, interface, and power management solutions.

The 74LCXP16245MTDX belongs to the LCX family of low-voltage CMOS transceivers designed specifically for voltage-level translation and bus isolation in mixed-signal embedded systems operating across 2.5 V, 3.3 V, and 5 V domains.

FAQ

What is the maximum propagation delay of the 74LCXP16245MTDX at 3.3 V?

The 74LCXP16245MTDX has a maximum propagation delay (t_PD) of 5.5 ns when operated at V_CC = 3.3 V ± 0.3 V with a 50 pF load. This value is specified across the full operating temperature range (−40 °C to +85 °C) and ensures timing compliance in 25 MHz synchronous bus designs. The 74LCXP16245MTDX achieves this performance using advanced CMOS process technology while maintaining low power consumption.

Does the 74LCXP16245MTDX require external pull-down resistors?

No, the 74LCXP16245MTDX integrates 30 kΩ pull-down resistors on all A0–A15 and B0–B15 I/O pins, activated only when the outputs are in 3-STATE (OE = HIGH). This eliminates the need for external termination components in modular or space-constrained applications. The 74LCXP16245MTDX's internal pull-downs ensure stable bus states without increasing PCB area or BOM count.

Is the 74LCXP16245MTDX pin-compatible with standard 74-series transceivers?

Yes, the 74LCXP16245MTDX features pinout compatibility with industry-standard 74 series 16245 devices, including identical signal assignments for OE, T/R, and I/O pins in its TSSOP-48 package. This allows drop-in replacement in existing designs migrating to low-voltage operation, provided V_CC and I/O voltage constraints are observed. The 74LCXP16245MTDX retains functional equivalence while adding 5V tolerance and integrated pull-downs.

What is the recommended power-up sequence for reliable operation of the 74LCXP16245MTDX?

To ensure high-impedance isolation during power-up, OE inputs of the 74LCXP16245MTDX must be tied to V_CC through a pull-up resistor-minimum value determined by the driver's current-sourcing capability. This prevents unintended output activation before V_CC stabilizes. The 74LCXP16245MTDX supports live insertion when this condition is met, making it suitable for hot-swap backplane applications.

What are the absolute maximum ratings for input voltage on the 74LCXP16245MTDX?

The 74LCXP16245MTDX specifies an absolute maximum DC input voltage (V_I) of −0.5 V to +7.0 V, independent of V_CC. However, for reliable operation, input voltage must remain within 0 V to 5.5 V under recommended conditions. Exceeding these limits risks permanent damage, and the 74LCXP16245MTDX is not guaranteed to function correctly outside its specified operating range-even if within absolute maximums.