Diodes Incorporated 74LVC244AT20-13

Overview

74LVC244AT20-13 from Diodes Incorporated is an octal non-inverting 3-state buffer/line driver in TSSOP-20 package, operating from 1.65V to 3.6V supply, with 5.5V-tolerant inputs, ±24mA drive capability at V_CC = 3.0V, and IOFF-enabled partial power-down protection. It serves as a bidirectional bus interface isolator in mixed-voltage PC peripheral subsystems.

For engineers reviewing the 74LVC244AT20-13 datasheet, 74LVC244AT20-13 pinout, 74LVC244AT20-13 application, or 74LVC244AT20-13 equivalent, key selection criteria include 3-state timing (t_EN ≤ 7.4ns @ 3.3V), input voltage tolerance (0–5.5V), thermal resistance (θ_JA = 74°C/W), Schmitt-trigger inputs, and IOFF leakage (±10μA).

Technical Context

This device implements two independent 4-bit non-inverting buffers, each controlled by a dedicated OE input (Pin 1 and Pin 19). Each buffer passes A→Y when OE is low; outputs enter high-impedance state when OE is high. The IOFF circuit disables output paths during V_CC ramp-down to prevent backflow current.

All inputs feature Schmitt-trigger action for noise immunity, and output drive strength scales with V_CC: I_OL = 24mA / I_OH = –24mA at 3.0V, dropping to ±4mA at 1.65V. Propagation delay (t_PD) is 3.8ns typical at 3.3V, with output skew ≤1.0ns across channels.

Key Specifications

Pinout & Package

TSSOP-20 package: 6.4mm × 6.5mm × 1.2mm body, 0.65mm lead pitch, gull-wing leads, JEDEC MO-153 compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal 3-state buffer applications.

Compared with SN74LVC244APWR and 74LVC244ABQ-Q100, the 74LVC244AT20-13 delivers full industrial temperature range (–40°C to +125°C), validated IOFF behavior, and simplified procurement-making it optimal for embedded systems requiring robustness without automotive certification overhead.

Availability

74LVC244AT20-13 is available at Aetrix Electronics and suitable for PC peripheral bus interface, hard disk drive controller isolation, and notebook memory subsystem buffering requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for 74LVC244AT20-13 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 power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The 74LVC244A belongs to Diodes' LVC logic family-designed specifically for low-voltage, mixed-signal interfacing in space-constrained, thermally demanding applications where voltage tolerance, power-down safety, and timing precision are critical.

FAQ

What is the maximum clock frequency supported by the 74LVC244AT20-13?

The 74LVC244AT20-13 is not a clocked device-it has no internal clock and operates asynchronously. Its usable data rate depends on propagation delay (3.8ns typical @ 3.3V) and system setup/hold timing. For clean 100MHz bus operation, ensure t_PD + trace delay remains within half-cycle margin; actual limit is system-defined, not part-specified.

Can this device safely interface a 5V microcontroller GPIO to a 1.8V FPGA I/O bank?

Yes-inputs tolerate 0–5.5V regardless of V_CC, so 5V MCU outputs connect directly. However, outputs swing from GND to V_CC; with V_CC = 1.8V, Y pins cannot drive 5V logic high. Use only for MCU→FPGA direction unless V_CC ≥ 5V (not allowed-max is 3.6V). Bidirectional use requires external level-shifting.

Does the IOFF feature require external biasing or configuration?

No-IOFF is fully automatic and requires no external components or configuration. When V_CC drops below ~0.8V, internal circuitry disables both output FETs, blocking current flow in either direction. This occurs inherently during power ramp-down or complete loss of supply, with no user intervention needed.

Is the TSSOP-20 package lead-free and RoHS-compliant?

Yes-the 74LVC244AT20-13 uses 100% lead-free terminations and complies fully with EU RoHS Directive 2011/65/EU. It is also halogen- and antimony-free ("Green"), with bromine/chlorine <900ppm each and antimony <1000ppm, verified per Diodes' AP02001 and AP02002 documentation.