Texas Instruments SN74LVTH540PWR

Overview

SN74LVTH540PWR from Texas Instruments is an octal buffer/driver IC designed for 3.3-V V_CC operation with mixed-mode 5-V input/output compatibility, 8-channel noninverting output configuration, ±64 mA output drive capability at V_CC = 3 V, and bus-hold inputs eliminating external pull resistors - used in memory address buffering and 3.3-V/5-V bus interfacing applications.

For engineers reviewing the SN74LVTH540PWR datasheet, SN74LVTH540PWR pinout, SN74LVTH540PWR application, or SN74LVTH540PWR equivalent, key selection considerations include its dual active-low 3-state enable architecture, I_off support for hot insertion, 2.7–3.6 V supply range, TSSOP-20 package thermal profile (θ_JA = 83°C/W), and bus-hold current specification (±500 µA).

Technical Context

The SN74LVTH540PWR implements a dual-gated 3-state control structure where OE1 and OE2 feed an AND gate with active-low logic: either enable high forces all eight Y outputs into high-impedance. Its bus-hold circuitry actively maintains valid logic states on undriven A inputs without external components, drawing ±500 µA dynamic hold current at V_CC = 3.6 V.

It supports hot insertion via I_off protection (±100 µA leakage at V_CC = 0) and power-up 3-state behavior, ensuring outputs remain high-Z during V_CC ramp from 0 to 1.5 V. Absolute input tolerance extends to 7 V independent of V_CC, enabling robust interfacing with legacy 5-V TTL systems.

Key Specifications

Pinout & Package

TSSOP-20 package (PW), 6.4 mm × 4.4 mm × 1.2 mm body, 0.65 mm lead pitch, exposed pad not present, JEDEC MO-153 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVTH540PWR, SN74LVC541APWR trades 5-V tolerance and bus-hold for lower cost and wider V_CC range, while SN74LVCH16244ADGGR offers double channel density at the expense of mixed-voltage capability - making SN74LVTH540PWR uniquely suited for 3.3-V/5-V boundary applications requiring minimal external components.

Availability

SN74LVTH540PWR is available at Aetrix Electronics and suitable for memory subsystem design, industrial backplane interfacing, hot-pluggable module control, and 3.3-V/5-V mixed-signal bridging requiring stable component supply and long-term production continuity.

Supply support for SN74LVTH540PWR 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 over 50 years of innovation in high-reliability interface and power management ICs.

The SN74LVTH540PWR belongs to TI's LVT (Low-Voltage TTL) logic family, engineered specifically for seamless interoperability between 3.3-V logic domains and legacy 5-V systems in industrial, telecom, and computing infrastructure.

FAQ

What is the maximum input voltage rating for SN74LVTH540PWR?

The SN74LVTH540PWR supports input voltages up to 7 V on all A and OE pins regardless of V_CC level, enabling safe connection to 5-V TTL sources while operating at 3.3 V. This 5-V-tolerant input architecture is explicitly specified in the absolute maximum ratings table and confirmed in the "Support Mixed-Mode Signal Operation" feature description.

Does SN74LVTH540PWR require external pullup resistors on its inputs?

No, SN74LVTH540PWR does not require external pullup or pulldown resistors because it integrates active bus-hold circuitry on all A inputs. The datasheet states "Bus Hold on Data Inputs Eliminates the Need for External Pullup/Pulldown Resistors" and specifies ±500 µA dynamic hold current at V_CC = 3.6 V - sufficient to maintain stable logic states on floating inputs.

Can SN74LVTH540PWR be used in hot-swap applications?

Yes, SN74LVTH540PWR is explicitly designed for hot-insertion applications using I_off and power-up 3-state functionality. When powered down (V_CC = 0), I_off limits current flow to ±100 µA; during power ramp (0–1.5 V), outputs remain in high-impedance state - both features are documented in the Functional Description and Absolute Maximum Ratings sections.

What is the output drive strength of SN74LVTH540PWR at 3.3-V supply?

At V_CC = 3.3 V, SN74LVTH540PWR delivers 64 mA sink current (I_OL) and −32 mA source current (I_OH) per output, as verified in the Electrical Characteristics table under SN74LVTH540 test conditions. These values exceed standard LVTTL requirements and support direct driving of multiple TTL loads or terminated transmission lines.

Is the pinout of SN74LVTH540PWR identical to SN74LVTH540DWR?

Yes, SN74LVTH540PWR and SN74LVTH540DWR share identical 20-pin functional pinouts - both follow the standard octal buffer layout with A inputs on one side (pins 1–8), GND/V_CC/OE on center (pins 9–11, 19), and Y outputs on the opposite side (pins 12–18, 20). This is confirmed by the "SN74LVTH540 . . . DB, DW, NS, OR PW PACKAGE (TOP VIEW)" diagram in the datasheet.