Texas Instruments SN74ALVCH244DGVR

Overview

SN74ALVCH244DGVR from Texas Instruments is an octal buffer/driver with 3-state outputs, designed for 1.65-V to 3.6-V operation. It features two independent 4-bit channels, ±24-mA output drive at 3.3 V, 2.8-ns max propagation delay, and integrated bus-hold circuitry eliminating external pullup/pulldown resistors. It is used in bidirectional data bus interfacing between FPGAs and microcontrollers in industrial control systems.

For engineers reviewing the SN74ALVCH244DGVR datasheet, SN74ALVCH244DGVR pinout, SN74ALVCH244DGVR application, or SN74ALVCH244DGVR equivalent, key selection criteria include 3-state output timing, bus-hold input behavior, 20-pin TVSOP package compatibility, and 1.65–3.6-V supply flexibility across mixed-voltage logic domains.

Technical Context

This device implements dual 4-bit noninverting buffers with independent 3-state enable controls (1OE and 2OE), supporting high-speed bidirectional data flow on shared buses. Each channel passes A-inputs to Y-outputs when its OE is low; outputs enter high-impedance state when OE is high.

Bus-hold circuitry actively maintains valid logic levels on undriven inputs without external resistors, reducing BOM count and layout complexity. The design meets JESD 17 latch-up immunity (>250 mA) and JESD 22 ESD ratings (2000-V HBM, 200-V MM), ensuring robustness in noisy industrial environments.

Key Specifications

Pinout & Package

SN74ALVCH244DGVR uses a 20-pin TVSOP (DGV) package, 4.4 mm × 6.6 mm × 1.2 mm height, with 0.5-mm pitch gull-wing leads. Pin 1 is located in quadrant Q1 per tape-and-reel orientation standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVCH244DGVR, SN74LVC244APWR offers lower cost but mandates external biasing, while 74AVC244PW extends voltage range downward at the expense of bus-hold reliability-making SN74ALVCH244DGVR optimal for unpopulated or dynamically reconfigured industrial buses.

Availability

SN74ALVCH244DGVR is available at Aetrix Electronics and suitable for industrial automation, embedded sensor aggregation, and FPGA peripheral expansion requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74ALVCH244DGVR 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

Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions with emphasis on industrial, automotive, and communications markets.

SN74ALVCH244DGVR belongs to TI's ALVC/ALVCH advanced low-voltage CMOS logic family, engineered for high-speed, low-power, mixed-voltage interfacing in space-constrained industrial control and test equipment.

FAQ

What is the maximum propagation delay of SN74ALVCH244DGVR at 3.3 V?

The maximum propagation delay (tpd) of SN74ALVCH244DGVR is 2.8 ns when operating at 3.3 V and 25°C, measured from input transition to output transition under specified load conditions (CL = 30 pF). This value ensures timing compliance in high-speed digital interfaces up to ~350 MHz clock-equivalent rates. SN74ALVCH244DGVR maintains this performance across its full industrial temperature range (-40°C to +85°C) with appropriate derating.

Does SN74ALVCH244DGVR require external pullup resistors on its inputs?

No, SN74ALVCH244DGVR integrates bus-hold circuitry on all data inputs (1A1–1A4, 2A1–2A4), which actively maintains valid logic states on undriven or floating inputs without external pullup or pulldown resistors. Using external resistors with bus-hold enabled is not recommended, as it may cause excessive current draw or logic instability. SN74ALVCH244DGVR's bus-hold current is ±45 µA at 2.3 V, sufficient for noise-immune idle-state retention.

What is the recommended power-up sequence for SN74ALVCH244DGVR?

To ensure outputs remain in high-impedance state during power-up, OE pins (1OE and 2OE) must be held high until VCC stabilizes. TI recommends tying OE to VCC through a pullup resistor; minimum value depends on the driver's current-sinking capability (typically ≤10 kΩ). Simultaneous VCC ramp and OE assertion prevents unintended output activation. SN74ALVCH244DGVR's absolute maximum rating allows VCC to reach 4.6 V transiently, but recommended operation remains within 1.65–3.6 V.

Can SN74ALVCH244DGVR operate at 1.8 V supply voltage?

Yes, SN74ALVCH244DGVR is fully specified for operation at 1.8 V (within its 1.65–3.6 V VCC range). At 1.8 V, it delivers ±4 mA output drive (IOL/IOH), supports 3.1-ns typical propagation delay, and maintains bus-hold functionality with ±75 µA hold current. Logic thresholds scale with VCC (VIH = 0.65×VCC, VIL = 0.35×VCC), ensuring compatibility with 1.8-V LVC and AVC logic families. SN74ALVCH244DGVR's guaranteed performance at 1.8 V makes it suitable for battery-powered or low-power industrial edge nodes.

What package type does SN74ALVCH244DGVR use, and what are its key mechanical dimensions?

SN74ALVCH244DGVR uses the TVSOP (DGV) package: 20-pin, 4.4 mm × 6.6 mm body size, 1.2 mm maximum height, and 0.5-mm lead pitch. It complies with JEDEC MO-153 and features gull-wing leads with quadrant Q1 pin-1 orientation in tape-and-reel packaging (2000 units/reel). The package supports fine-pitch SMT assembly and provides thermal impedance (θJA) of 92°C/W, enabling operation at full drive strength in compact industrial PCB layouts. SN74ALVCH244DGVR's DGV footprint is incompatible with SOIC (DW) or TSSOP (PW) land patterns.