74ALVCH16501DL,118

Overview

The Nexperia 74ALVCH16501 is an 18-bit universal bus transceiver featuring bus hold inputs and 3-state outputs. It supports a wide supply voltage range from 1.2 V to 3.6 V, with maximum speed performance specified at 2.3 V to 2.7 V (CL = 30 pF) and 3.0 V to 3.6 V (CL = 50 pF). The device operates within an ambient temperature range of -40 °C to +85 °C. It includes IOFF circuitry for partial power-down applications, preventing damaging backflow currents when powered down.

Feature Summary

• Universal bus transceiver architecture incorporating D-type latches and D-type flip-flops capable of transparent, latched, or clocked operation modes.
• Integrated bus hold functionality on all data inputs to maintain signal integrity.
• IOFF circuitry enables partial power-down mode by disabling outputs to prevent backflow current during power loss.

Applications

• Bus-oriented applications requiring 3-state non-inverting outputs
• Driving 50 Ω transmission lines at elevated temperatures
• Mixed voltage environments utilizing direct interface with TTL levels

Procurement Notes

Verify the specific ordering suffix '118' against official Nexperia documentation to confirm package type and tape/reel specifications. Ensure the selected variant matches the required operating temperature range and pin configuration for your design implementation.

Selection Notes

Select this component for designs requiring high-density 18-bit data transfer with flexible control over data flow direction. The inclusion of bus hold inputs simplifies PCB routing by eliminating external pull-up or pull-down resistors. Verify that the system voltage falls within the 1.2 V to 3.6 V range to ensure optimal performance and compliance with JEDEC standards.

Part Context

This device belongs to the ALVCH logic family, designed for low-voltage CMOS applications. It serves as a bridge between different voltage domains, offering direct compatibility with TTL input levels while operating at lower supply voltages. The 18-bit width makes it suitable for parallel data buses in embedded systems.

Replacement Considerations

Check for updated package options, as previous versions included DL packages which have been removed in recent revisions. Ensure any substitute part maintains the same 56-lead TSSOP footprint and functional pinout if physical replacement is required.

FAQ

How does the device handle partial power-down scenarios?

The 74ALVCH16501 features IOFF circuitry that automatically disables the outputs when the device is powered down, preventing potentially damaging backflow current through the device.

What controls the data flow direction between ports A and B?

Data flow is controlled by separate output enable inputs (OEAB and OEBA), latch enable inputs (LEAB and LEBA), and clock inputs (CPAB and CPBA) for each direction.