Texas Instruments SN74LVTZ244DWR

Overview

SN74LVTZ244DWR from Texas Instruments is an octal 3.3-V bus buffer/driver with two independent 4-bit sections, each featuring separate output-enable (OE) control, bus-hold inputs, and mixed-mode 5-V-tolerant I/O-designed for level-shifting between 3.3-V logic domains and legacy 5-V systems in industrial backplanes and embedded controllers.

For engineers reviewing the SN74LVTZ244DWR datasheet, SN74LVTZ244DWR pinout, SN74LVTZ244DWR application, or SN74LVTZ244DWR equivalent, this device delivers verified 3.3-V operation with 2.7–3.6-V supply support, ±64-mA output drive, sub-5-ns propagation delay, high-impedance state during power sequencing, and JEDEC-compliant latch-up immunity-critical for robust signal integrity in mixed-voltage board designs.

Technical Context

The SN74LVTZ244DWR implements Advanced BiCMOS Technology (ABT) to achieve low-static power dissipation while maintaining TTL-compatible input thresholds and 5-V-tolerant outputs at 3.3-V VCC. Its dual 4-bit architecture enables independent enable control per group, supporting asymmetric bus loading and partial bus isolation.

Integrated bus-hold circuitry actively maintains valid logic levels on unused A-inputs without external pull resistors, and the device guarantees high-impedance outputs during power-up/down transitions-eliminating bus contention in hot-swap and brown-out scenarios across −40°C to 85°C operation.

Key Specifications

Pinout & Package

SN74LVTZ244DWR uses a 20-pin SOIC (DW) package measuring 13.3 mm × 7.5 mm × 2.65 mm (max height), with 1.27-mm lead pitch and standard JEDEC MS-013 outline. Pin 1 is located at the top-left corner with index marking, and the package is RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVTZ244DWR, SN74LVC244APWR sacrifices 5-V I/O tolerance and bus-hold to reduce cost and static current, while SN74LVTH244ADW trades 5-V input compatibility for faster propagation and TTL-level output swing-making SN74LVTZ244DWR uniquely suited for mixed-voltage industrial interfaces requiring robustness and simplicity.

Availability

SN74LVTZ244DWR is available at Aetrix Electronics and suitable for industrial backplanes, embedded controller I/O expansion, and telecom line card signal conditioning requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for SN74LVTZ244DWR 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 connectivity technologies, with decades of expertise in logic interface solutions for industrial and automotive markets.

The SN74LVTZ244DWR belongs to TI's ABT-family of advanced BiCMOS bus buffers, engineered specifically for seamless 3.3-V/5-V mixed-signal interoperability in mission-critical infrastructure equipment.

FAQ

What is the absolute maximum supply voltage for SN74LVTZ244DWR?

The absolute maximum VCC rating for SN74LVTZ244DWR is 4.6 V. Exceeding this voltage-even momentarily-may cause permanent damage. The device is designed for 3.3-V operation with recommended VCC between 2.7 V and 3.6 V. Operation outside this range risks violating timing specs, increasing ICC, or triggering latch-up despite its JESD17-rated immunity. Always use proper decoupling and avoid underspecified regulators when deploying SN74LVTZ244DWR in production systems.

Does SN74LVTZ244DWR support true 5-V input logic levels?

Yes, SN74LVTZ244DWR accepts input voltages up to 5.5 V regardless of VCC, making it fully compatible with standard 5-V TTL logic families. This is explicitly confirmed in the "Recommended Operating Conditions" table (VI = 5.5 V) and "Electrical Characteristics" section (VIK = −1.2 V at II = −18 mA). The device does not require external clamping or level-shifting circuitry when interfacing with 5-V sources-enabling direct connection to legacy peripherals while operating at 3.3-V VCC.

How does the bus-hold feature work on SN74LVTZ244DWR inputs?

SN74LVTZ244DWR integrates active bus-hold circuitry on all eight A-inputs, drawing ±75 µA to maintain the last-valid logic state when inputs float. This eliminates the need for external 10-kΩ pullup/pulldown resistors-reducing BOM cost, PCB area, and potential noise pickup. Bus-hold activates automatically; no configuration or enable signal is required. It functions across the full −40°C to +85°C temperature range and remains effective even at minimum VCC (2.7 V), ensuring robust startup behavior in SN74LVTZ244DWR-based systems.

Can SN74LVTZ244DWR outputs drive standard TTL loads?

Yes, SN74LVTZ244DWR outputs can directly drive standard TTL loads. Its IOL rating of 64 mA (min) exceeds the 16-mA sink requirement of TTL inputs, and its VOH of 2.0 V (min at IOH = −24 mA) meets TTL's 2.0-V high-level threshold. The device also provides 5-V-tolerant outputs capable of interfacing with 5-V receivers. These capabilities are validated across the full operating temperature range and make SN74LVTZ244DWR suitable for bridging 3.3-V logic to legacy TTL subsystems without additional buffering.

What is the pin 1 location and package footprint for SN74LVTZ244DWR?

SN74LVTZ244DWR uses a 20-pin SOIC (DW) package with pin 1 located at the top-left corner, identified by a beveled edge or circular mark near the lead. The JEDEC MS-013-compliant footprint has 1.27-mm lead pitch, 7.5-mm body width, 13.3-mm length, and 2.65-mm max height. Land pattern recommendations include 2.0-mm pad length, 0.6-mm pad width, and 9.3-mm overall pad-to-pad spacing-details are provided in TI's DW0020A package drawing and IPC-7351-compliant board layout guidelines for SN74LVTZ244DWR.