Texas Instruments SN74AHC244DGVR

Overview

SN74AHC244DGVR from Texas Instruments is an octal 3-state noninverting buffer/driver IC designed for bus interface applications requiring high drive strength, level translation, and signal isolation. It operates from 2V to 5.5V, delivers ±8mA output drive at 5V, supports 10ns typical propagation delay (VCC = 5V, CL = 15pF), and features dual independent 4-bit banks with separate 3-state enables - used in PC motherboard address/data buses and industrial I/O expansion modules.

For engineers reviewing the SN74AHC244DGVR datasheet, SN74AHC244DGVR pinout, SN74AHC244DGVR application, or SN74AHC244DGVR equivalent, key selection criteria include its TVSOP-20 package footprint (5.00mm × 6.4mm), balanced CMOS push-pull/3-state outputs, overvoltage-tolerant inputs (up to 5.5V), and compatibility with mixed-voltage system interfacing such as 3.3V logic driving 5V-tolerant loads.

Technical Context

The SN74AHC244DGVR implements two independent 4-bit noninverting buffer banks (Bank 1: pins 1A1–1A4 → 1Y1–1Y4; Bank 2: 2A1–2A4 → 2Y1–2Y4), each controlled by a dedicated 3-state enable input (1OE, 2OE). All outputs enter high-impedance when their respective OE is high, enabling bidirectional bus sharing without external direction control logic.

Its CMOS architecture provides rail-to-rail output swing, input thresholds referenced to VCC (VIH = 0.7×VCC, VIL = 0.3×VCC), and balanced sourcing/sinking capability (±8mA at 5V). The device supports down-translation: 5V-tolerant inputs operate correctly with VCC as low as 2V, making it suitable for interfacing legacy 5V peripherals with modern 3.3V or 2.5V controllers.

Key Specifications

Pinout & Package

SN74AHC244DGVR is packaged in a 20-pin Thin Very Small Outline Package (TVSOP) with 0.4mm pitch, body size 5.00mm × 4.40mm, and overall footprint 5.00mm × 6.4mm. This compact, surface-mount package supports high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AHC244DGVR, SN74LVC244APWR offers higher drive at lower voltage but sacrifices 5V input tolerance, while 74AHC244PW,118 matches functionality exactly but demands PCB rework for its larger TSSOP footprint - making SN74AHC244DGVR optimal for space-constrained, mixed-voltage bus isolation.

Availability

SN74AHC244DGVR is available at Aetrix Electronics and suitable for PC motherboard design, industrial I/O expansion, and test equipment development requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for SN74AHC244DGVR 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 specializing in analog, embedded processing, and logic solutions, with decades of expertise in high-reliability logic families and automotive-qualified manufacturing.

The SN74AHC244DGVR belongs to TI's Advanced High-Speed CMOS (AHC) logic series, engineered for low-power, high-speed bus interface applications in computing, industrial automation, and communications infrastructure where signal integrity and voltage flexibility are critical.

FAQ

What is the maximum input voltage rating for SN74AHC244DGVR?

The SN74AHC244DGVR supports input voltages up to 5.5V regardless of VCC level - meaning it can safely accept 5V signals even when powered at 2.5V or 3.3V. This overvoltage tolerance eliminates external level-shifting circuitry in mixed-voltage systems and is confirmed in Section 5.3 (Recommended Operating Conditions) and Section 5.1 (Absolute Maximum Ratings) of the official datasheet.

Does SN74AHC244DGVR require external pull-up resistors on its OE pins?

Yes - to ensure all outputs remain in high-impedance during power-up or power-down, both 1OE and 2OE pins should be tied to VCC through pull-up resistors. TI recommends values ≥10kΩ, sized based on the driving source's sink capability and pin leakage (≤1µA per Electrical Characteristics table). This prevents bus contention before firmware initializes the enables.

What is the thermal resistance (RθJA) of the SN74AHC244DGVR in its TVSOP package?

The SN74AHC244DGVR in the DGV (TVSOP-20) package has a junction-to-ambient thermal resistance (RθJA) of 119.2°C/W, as specified in Section 5.4 (Thermal Information) of the datasheet. This value assumes standard JEDEC 2-layer board conditions and informs derating calculations for continuous operation at elevated ambient temperatures or high output loading.

Can SN74AHC244DGVR drive a 50pF load at 50MHz without signal degradation?

Yes - the SN74AHC244DGVR delivers 3.9ns typical propagation delay and <1ns output skew at CL = 15pF (VCC = 5V), and maintains <8.5ns enable timing at CL = 50pF. Its ±8mA drive strength and balanced CMOS outputs support clean edges into 50pF loads at frequencies up to 100MHz, provided PCB layout follows TI's guidelines (e.g., 12cm max trace length, ground plane, damping resistors).

Is SN74AHC244DGVR pin-compatible with other packages of the same part number?

No - SN74AHC244DGVR (TVSOP-20) shares logic function and pin numbering with other SN74AHC244 variants (e.g., SOIC, TSSOP, VQFN), but mechanical dimensions, thermal pad presence, and solder mask requirements differ. For example, the RKS (VQFN) variant includes an exposed thermal pad not present in DGV; substituting packages requires PCB redesign and thermal validation.