Texas Instruments SN74LVCH244ADGVR

Overview

SN74LVCH244ADGVR from Texas Instruments is an octal buffer/line driver with 3-state outputs, designed for 1.65 V to 3.6 V operation. It features bus-hold circuitry on all data inputs, I_off support for partial-power-down mode, 5.9 ns max propagation delay at 3.3 V, and mixed-mode signal compatibility (5-V input tolerance with 3.3-V V_CC). It is used in bidirectional data bus interfacing between 3.3-V and 5-V logic domains in industrial control backplanes.

For engineers reviewing the SN74LVCH244ADGVR datasheet, SN74LVCH244ADGVR pinout, SN74LVCH244ADGVR application, or SN74LVCH244ADGVR equivalent, key selection criteria include its 20-pin TVSOP (DGV) package, 3-state output enable architecture, bus-hold elimination of external pull resistors, and guaranteed 5.5-V tolerant inputs - critical for voltage-level translation in legacy-to-modern system upgrades.

Technical Context

This device implements two independent 4-bit noninverting buffers, each with dedicated output-enable (OE) control. The active-low OE inputs allow per-group 3-state control, enabling bidirectional bus arbitration without external logic. Bus-hold circuitry maintains valid logic states on undriven A-inputs, eliminating need for external biasing.

Its I_off protection disables outputs during power-down, preventing current backflow when V_CC = 0 V while inputs remain at 5.5 V. Input voltage tolerance up to 5.5 V enables direct connection to 5-V TTL outputs, while output drive strength (±24 mA at 3 V) supports driving 50-Ω transmission lines or multiple CMOS loads.

Key Specifications

Pinout & Package

SN74LVCH244ADGVR is housed in a 20-pin Thin Very Small Outline Package (TVSOP), designated DGV, with 0.5-mm pitch, 4.4-mm width, and 1.2-mm maximum height. This RoHS-compliant, 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 buffer applications.

Compared with SN74LVCH244ADGVR, SN74LVC244APWR reduces BOM cost but increases design risk on undriven buses, while 74ALVC244PW offers identical speed but sacrifices I_off safety and bus-hold reliability - making SN74LVCH244ADGVR the sole choice for mixed-voltage, hot-pluggable, or floating-input industrial interfaces.

Availability

SN74LVCH244ADGVR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system upgrade adapters, programmable logic I/O expansion, and automated test equipment signal conditioning requiring stable component supply and long-term lifecycle support.

Supply support for SN74LVCH244ADGVR 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 for industrial, automotive, and communications markets.

The SN74LVCH244A product line delivers robust, voltage-flexible octal buffers for mixed-supply system interfacing - engineered specifically for industrial control, test equipment, and legacy-to-modern hardware integration where reliability under partial power-down and floating input conditions is mandatory.

FAQ

What is the maximum input voltage rating for SN74LVCH244ADGVR?

The SN74LVCH244ADGVR accepts input voltages from –0.5 V to 5.5 V, regardless of V_CC level. This 5.5-V absolute maximum rating enables direct connection to 5-V TTL outputs even when operating at 1.65 V, making SN74LVCH244ADGVR ideal for mixed-voltage bus translation without external level shifters.

Does SN74LVCH244ADGVR require external pullup resistors on its inputs?

No. SN74LVCH244ADGVR integrates bus-hold circuitry on all eight data inputs (1A1–1A4, 2A1–2A4), which actively maintains the last-valid logic state when inputs are floating or undriven. Using external pullup or pulldown resistors with SN74LVCH244ADGVR is not recommended and may interfere with bus-hold functionality.

How does SN74LVCH244ADGVR behave during power-down sequences?

SN74LVCH244ADGVR features I_off circuitry that disables outputs when V_CC = 0 V, limiting leakage current to ±10 µA even if inputs or outputs are held at 5.5 V. This prevents damaging back-current flow through the device, making SN74LVCH244ADGVR suitable for hot-swap and partial-power-down system architectures common in industrial backplanes.

What is the propagation delay of SN74LVCH244ADGVR at 1.8 V supply?

At V_CC = 1.8 V, the typical propagation delay (t_pd) of SN74LVCH244ADGVR is 6.9 ns, with a maximum of 1.5 ns (per datasheet Figure 5). This performance enables reliable operation in low-voltage, high-speed digital interfaces such as FPGA configuration buses or sensor data aggregation links where power efficiency and timing closure are both critical.

Is SN74LVCH244ADGVR pin-compatible with other packages in the SN74LVCH244A family?

Yes - SN74LVCH244ADGVR shares identical pinout and function mapping with all 20-pin variants of the SN74LVCH244A family, including SN74LVCH244ADBR (SSOP), SN74LVCH244ADWR (SOIC), and SN74LVCH244APWR (TSSOP). This allows drop-in replacement across package types without PCB redesign, provided thermal and mechanical constraints are met for the TVSOP footprint.