Texas Instruments SN74LV374APWT

Overview

SN74LV374APWT from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, designed for 2 V to 5.5 V operation, featuring 9.5 ns maximum propagation delay at 5 V, I_off support for partial-power-down mode, and mixed-mode voltage operation across all ports. It serves as a bus interface register in industrial PLCs and analog input modules.

For engineers reviewing the SN74LV374APWT datasheet, SN74LV374APWT pinout, SN74LV374APWT application, or SN74LV374APWT equivalent, this device is selected for high-reliability data latching in mixed-voltage systems requiring low ground bounce (<0.8 V), controlled output undershoot (>2.3 V), and robust ESD protection (±2000 V HBM).

Technical Context

The SN74LV374APWT implements eight independent D-type latches triggered on the rising edge of CLK, each with individually controllable 3-state outputs enabled by OE. Its logic diagram confirms positive-edge clocking and non-inverting output behavior.

It supports true mixed-mode operation: inputs tolerate up to 5.5 V regardless of V_CC, enabling level translation from higher-voltage buses into 2.5 V/3.3 V domains. The I_off circuitry actively disables outputs during power-down to prevent backflow current, satisfying JESD78 latch-up requirements (>250 mA).

Key Specifications

Pinout & Package

TSSOP-20 (PW) package: 6.50 mm × 4.40 mm body, 0.65 mm pitch, thin-profile surface-mount construction optimized for high-density industrial PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal D-type latch applications.

Compared with SN74LVC374APW and 74LVX374M, the SN74LV374APWT uniquely supports 5 V-tolerant inputs across its full 2–5.5 V V_CC range and operates reliably at 125°C - making it the only option for legacy 5 V peripheral interfacing in high-temperature industrial control.

Availability

SN74LV374APWT is available at Aetrix Electronics and suitable for programmable logic controllers, distributed control systems, AC inverter drives, and rail transportation electronics requiring stable component supply across extended temperature and mixed-voltage conditions.

Supply support for SN74LV374APWT 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 U.S.-based semiconductor company specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN74LV374APWT belongs to TI's LV logic family, engineered for low-voltage operation with robust noise immunity and mixed-signal interface capability - specifically targeting industrial automation and high-reliability control systems.

FAQ

What is the maximum clock frequency supported by the SN74LV374APWT at 3.3 V?

The SN74LV374APWT supports a maximum clock frequency of 150 MHz at V_CC = 3.3 V ± 0.3 V with 15 pF load capacitance, as specified in Section 6.7 of the datasheet. This value drops to 110 MHz at full temperature range (–40°C to +125°C). The actual usable frequency depends on board layout, trace impedance, and load conditions - SN74LV374APWT's low t_pd and controlled edge rates help maintain timing margin in noisy environments.

Does the SN74LV374APWT support 5 V logic inputs while operating at 3.3 V V_CC?

Yes, the SN74LV374APWT supports 5 V-tolerant inputs: its VI specification allows input voltages up to 5.5 V regardless of V_CC level, enabling direct connection to 5 V buses without external level shifters. This mixed-mode capability is explicitly confirmed in the Features section and Section 6.3 of the SN74LV374APWT datasheet.

How does the I_off feature function in the SN74LV374APWT during power-down sequences?

The I_off circuitry in the SN74LV374APWT automatically disables all outputs when V_CC falls below functional threshold, limiting leakage current to ≤5 µA. This prevents damaging backflow current from powered sections into unpowered ones - a critical requirement for modular I/O systems undergoing staged power cycling. The SN74LV374APWT maintains this protection across its full –40°C to +125°C operating range.

What is the recommended pull-up resistor value for OE on the SN74LV374APWT during power-up?

Texas Instruments recommends tying OE to V_CC through a pull-up resistor to guarantee high-impedance outputs at power-on. The minimum resistor value is determined by the current-sinking capability of the driving source; typical values range from 4.7 kΩ to 10 kΩ. This ensures the SN74LV374APWT enters a known safe state before clock or data signals are asserted - a requirement explicitly stated in Section 8.1 of the SN74LV374APWT datasheet.

Is the SN74LV374APWT pin-compatible with other TSSOP-20 octal latches like the SN74LVC374APW?

No, the SN74LV374APWT is not pin-compatible with SN74LVC374APW. Although both use TSSOP-20 packages, their pin functions differ: SN74LV374APWT places OE on Pin 1 and CLK on Pin 11, whereas SN74LVC374APW assigns OE to Pin 19 and CLK to Pin 11 - creating a conflict on Pin 1. Board-level replacement requires layout revision; SN74LV374APWT's unique pinout is documented in Figure 5-1 and Table 5-1 of its datasheet.