Diodes Incorporated 74LVCH244AT20-13

Overview

74LVCH244AT20-13 from Diodes Incorporated is an octal non-inverting buffer/line driver with bus-hold and 3-state outputs in TSSOP-20 package. It provides two independent 4-bit channels, each with separate output-enable (OE) control, operates from 1.65V to 3.6V, tolerates 5.5V inputs, and supports partial power-down via IOFF. Used for bidirectional bus driving in mixed-voltage PC and peripheral interfaces.

For engineers reviewing the 74LVCH244AT20-13 datasheet, 74LVCH244AT20-13 pinout, 74LVCH244AT20-13 application, or 74LVCH244AT20-13 equivalent, key selection criteria include 3.6V max supply, 5.5V-tolerant inputs, bus-hold functionality eliminating external resistors, IOFF protection during power sequencing, and TSSOP-20 thermal resistance (θJA = 74°C/W).

Technical Context

This device implements dual 4-bit CMOS buffer architecture with Schmitt-trigger inputs for noise immunity and bus-hold circuitry that actively maintains logic state on un-driven inputs without pull resistors. Each channel features independent OE control enabling selective bus isolation.

IOFF circuitry disables outputs during power-down to prevent back-current flow, while 5.5V input tolerance allows interfacing with legacy 5V logic in 3.3V systems. Propagation delay is 3.9ns typical at 3.3V, with enable/disable times under 7.4ns and output skew ≤1.5ns.

Key Specifications

Pinout & Package

TSSOP-20 package: 6.4mm × 6.5mm × 1.2mm body, 0.65mm lead pitch, surface-mount, moisture sensitivity level 1 (MSL1).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal buffer applications.

Compared with SN74LVC244APWR, the 74LVCH244AT20-13 reduces component count via integrated bus-hold; versus 74LVC244ABQ-Q100, it offers lower cost and standard industrial qualification without automotive overhead.

Availability

74LVCH244AT20-13 is available at Aetrix Electronics and suitable for PC motherboard I/O expansion, industrial PLC backplane interfaces, and notebook SATA/IDE bridge logic requiring stable component supply, consistent TSSOP-20 sourcing, and RoHS-compliant logistics.

Supply support for 74LVCH244AT20-13 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, energy-efficient solutions for computing, industrial, and consumer markets.

The 74LVCH244A belongs to Diodes' LVC logic family designed for low-voltage, mixed-signal interfacing in space-constrained, thermally demanding applications such as portable computing and industrial automation.

FAQ

Does the 74LVCH244AT20-13 support hot insertion in live 5V backplanes?

Yes. Its IOFF circuitry disables outputs when VCC = 0V while inputs remain at up to 5.5V, preventing back-current flow and protecting both the device and upstream 5V sources during hot-plug events in industrial backplanes.

Can bus-hold functionality replace external pull-up resistors on all eight inputs simultaneously?

Yes. Bus-hold circuitry actively maintains the last valid logic state on any un-driven input without external components. This applies independently to all eight inputs, eliminating the need for 8× pull-up or pull-down resistors in idle or undriven configurations.

What is the maximum clock frequency supported for data toggling on Y outputs?

Based on 3.9ns typical propagation delay and 1.5ns output skew at 3.3V, the device supports reliable data rates up to 100MHz in point-to-point configurations with controlled trace impedance and minimal stub length.

Is the TSSOP-20 package compatible with standard reflow profiles for lead-free assembly?

Yes. The 74LVCH244AT20-13 is fully RoHS-compliant and rated for standard JEDEC J-STD-020D reflow profiles, including peak temperatures up to 260°C, with MSL1 rating ensuring unlimited floor life when stored properly.