onsemi M74LCX16245DTR2G

Overview

M74LCX16245DTR2G from onsemi is a 16-bit non-inverting bidirectional transceiver operating from 1.65 V to 5.5 V, featuring 5.5 V-tolerant inputs/outputs, 4.5 ns max propagation delay at 3.0 V, and dual byte-level control (OE1/OE2 and T/R1/T/R2) for independent A0–A7/B0–B7 and A8–A15/B8–B15 bus segments - used in low-voltage memory address driving and mixed-voltage TTL-level bus interfacing.

For engineers reviewing the M74LCX16245DTR2G datasheet, pinout, applications, or equivalent options, key selection criteria include 5 V tolerance with sub-2 V supply operation, 24 mA drive capability at 3.0 V, IOFF protection at VCC = 0 V, live insertion support, and TSSOP-48 package compatibility with high-density PCB layouts.

Technical Context

The M74LCX16245DTR2G implements two independent 8-bit transceiver sections, each with dedicated Transmit/Receive (T/Rn) and Output Enable (OEn) controls, enabling asymmetric data flow direction and tri-state management per byte. Its CMOS input structure supports LVTTL and LVCMOS logic families while maintaining 5.5 V absolute maximum input voltage rating.

Propagation delay is specified down to 4.5 ns at VCC = 3.0 V, with output enable/disable times ≤6.5 ns under same conditions. The device guarantees high-impedance isolation during power-down (IOFF ≤10 µA at VCC = 0 V) and exhibits latchup immunity >100 mA per JEDEC JESD78.

Key Specifications

Pinout & Package

TSSOP-48 (Case 1201), 12.5 mm × 6.1 mm × 1.0 mm body, 0.5 mm pitch, Pb-free RoHS-compliant package with exposed thermal pad not present - suitable for reflow soldering and automated assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit transceiver applications.

Compared with SN74LVC16245ADGGR and 74ALVC16245PW, the M74LCX16245DTR2G uniquely supports 1.65–5.5 V operation with guaranteed 5.5 V input tolerance - making it the only option among the three for seamless 1.8 V ↔ 5 V bidirectional bridging without auxiliary circuitry.

Availability

M74LCX16245DTR2G is available at Aetrix Electronics and suitable for memory address buffering, legacy peripheral interfacing, hot-swappable backplanes, low-power industrial controllers, and mixed-voltage bus translation requiring stable component supply and long-term lifecycle assurance.

Supply support for M74LCX16245DTR2G 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient silicon solutions for automotive, industrial, cloud, and IoT applications - with leadership in analog, power management, and logic devices.

The MC74LCX family was designed for low-voltage, high-speed logic interfacing in mixed-supply systems - specifically targeting applications requiring 5 V tolerance, live insertion, and sub-5 ns timing at 1.65–5.5 V operation.

FAQ

What is the minimum supply voltage required for reliable operation of the M74LCX16245DTR2G?

The M74LCX16245DTR2G operates reliably from 1.65 V to 5.5 V. At 1.65 V, it meets all AC/DC specifications including 8.5 ns max propagation delay and 5.5 V input tolerance. This makes the M74LCX16245DTR2G suitable for ultra-low-voltage applications such as battery-powered sensors and portable instrumentation where core logic runs at 1.8 V.

Does the M74LCX16245DTR2G support hot-swap functionality, and how is it implemented?

Yes, the M74LCX16245DTR2G supports live insertion and withdrawal via its IOFF specification: when VCC = 0 V, input/output leakage remains ≤10 µA, preventing back-driving of powered buses. This behavior is guaranteed across temperature and ensures safe hot-plug operation in modular backplanes - a key feature confirmed in the official onsemi datasheet for M74LCX16245DTR2G.

Can the M74LCX16245DTR2G interface directly between a 1.8 V microcontroller and a 5 V EEPROM without external level shifters?

Yes. The M74LCX16245DTR2G accepts 0–5.5 V inputs regardless of VCC (1.65–5.5 V), and outputs swing rail-to-rail within the supply range. When powered at 1.8 V, its inputs safely accept 5 V signals, and its outputs drive 5 V-tolerant EEPROM inputs to valid logic thresholds - eliminating need for discrete translators in this configuration.

What is the maximum data rate supported by the M74LCX16245DTR2G in a typical 3.3 V system?

With a 4.5 ns maximum propagation delay at VCC = 3.0 V and 6.5 ns output enable time, the M74LCX16245DTR2G supports clean data transfer up to ~200 MHz in point-to-point configurations. Real-world bus throughput depends on load capacitance and termination, but the M74LCX16245DTR2G's 8 pF typical I/O capacitance and 24 mA drive ensure signal integrity on 50 pF traces at these speeds.

How does the dual-byte control architecture of the M74LCX16245DTR2G improve system design flexibility?

The M74LCX16245DTR2G provides separate OE1/T/R1 and OE2/T/R2 controls for A0–A7/B0–B7 and A8–A15/B8–B15, allowing independent direction and enable states per byte. This enables asymmetric bus protocols - e.g., reading low-address bytes while writing high-address bytes - and reduces glue logic in custom ASIC/FPGA interfaces using the M74LCX16245DTR2G.