16-bit Buffers / Line Drivers with 3-state Outputs# Technical Documentation: HD74LVC16244ATEL 16-bit Buffer/Line Driver with 3-state Outputs
Manufacturer: HITACHI (Renesas Electronics Corporation)
Component Type: 16-bit Buffer/Line Driver
Logic Family: LVC (Low-Voltage CMOS)
Package: TSSOP-48
---
## 1. Application Scenarios
### Typical Use Cases
The HD74LVC16244ATEL is a high-performance, 16-bit non-inverting buffer and line driver designed for 3.3V systems with 5V tolerance. Its primary function is to isolate, buffer, and drive signal lines across different sections of a digital system.
Key Use Cases Include:
* Bus Buffering and Isolation: Placed between a microprocessor/microcontroller and a shared data/address bus (e.g., connecting to multiple memory chips, peripherals, or FPGAs) to prevent loading effects and provide clean signal integrity.
* Signal Level Translation: Acting as a simple level shifter for interfacing between 3.3V logic and 5V-tolerant devices, thanks to its 5V-tolerant inputs and 3.3V output levels.
* Increasing Fan-out: Driving multiple high-capacitance loads (e.g., long PCB traces, multiple input pins) from a single, weaker source without degrading signal rise/fall times.
* Output Port Expansion: Used in conjunction with a multiplexer or GPIO expander to increase the number of available high-current output lines from a controller.
### Industry Applications
* Consumer Electronics: Set-top boxes, digital TVs, gaming consoles for memory bus interfacing and peripheral driving.
* Telecommunications & Networking: Routers, switches, and base station equipment for backplane driving and signal conditioning on control buses.
* Industrial Automation: PLCs (Programmable Logic Controllers), motor drives, and sensor interface modules where robust signal driving in noisy environments is required.
* Automotive Infotainment: Used in display controllers and audio systems for data line buffering, though note it is not typically an AEC-Q100 qualified part for under-hood applications.
* Test & Measurement Equipment: As part of the digital I/O section for driving signals to device-under-test (DUT) pins.
### Practical Advantages and Limitations
Advantages:
* High-Speed Operation: Typical propagation delay of ~3.5 ns at 3.3V, suitable for modern high-speed digital interfaces.
* Low Power Consumption: Utilizes advanced CMOS technology, with very low static current (ICC) and dynamic power dissipation.
* 5V-Tolerant Inputs: Allows safe interfacing with legacy 5V logic components, simplifying system migration.
* High Output Drive: Capable of sourcing/sinking up to 24 mA, sufficient to drive multiple loads or transmission lines.
* 3-State Outputs: Feature separate output enable (OE) pins for two 8-bit sections, allowing flexible bus isolation and multiplexing.
* Bus-Hold Function (on inputs): Eliminates the need for external pull-up/pull-down resistors on unused or floating input lines, saving board space and component count.
Limitations:
* Limited Voltage Range: Core operation is 1.65V to 3.6V. While inputs are 5V tolerant, the VCC supply must remain within the specified range.
* Not a Voltage Regulator: It is a digital buffer, not a level translator for analog signals or power rails.
* Simultaneous Switching Noise (SSN): Switching all 16 outputs simultaneously at high speed can cause significant ground bounce and VCC sag, potentially leading to signal integrity issues.
* ESD Sensitivity: As
