NXP Semiconductors 74LVTH574D,112

Overview

74LVTH574D,112 from NXP Semiconductors is a 3.3 V octal D-type flip-flop with 3-state outputs, edge-triggered by a rising clock (CP), and independently controlled output enable (OE). It features bus hold on all data inputs, TTL-compatible I/O levels, and operates from −40 °C to +85 °C. It serves as an 8-bit latch/register for data buffering in high-speed microprocessor buses and memory interfaces.

For engineers reviewing the 74LVTH574D,112 datasheet, 74LVTH574D,112 pinout, 74LVTH574D,112 application, or 74LVTH574D,112 equivalent, key selection criteria include 3-state bus driving capability, 3.3 V supply compatibility with 5 V-tolerant inputs, propagation delay ≤5.9 ns at 2.7 V, bus hold functionality eliminating external pull-ups, and SO20 package suitability for legacy PCB layouts.

Technical Context

The 74LVTH574D,112 implements eight independent D-type flip-flops, each capturing the state of its Dn input one setup time before the LOW-to-HIGH CP transition. Its 3-state output buffers are optimized for driving heavily loaded buses, MOS memories, and microprocessors - with OE active LOW enabling simultaneous high-impedance control regardless of clock state.

It integrates bus hold circuitry on all Dn inputs (IBHL = 75–150 µA at VCC = 3.0 V), supports live insertion/extraction, and includes power-up 3-state and latch-up protection exceeding JESD78 Class II (500 mA). Input voltage tolerance extends to 5.5 V, allowing direct interfacing with 5 V systems without level shifters.

Key Specifications

Pinout & Package

74LVTH574D,112 uses the SO20 (SOT163-1) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm pitch, with gull-wing leads suitable for surface-mount reflow.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC574APWR and 74ALVC574PW, the 74LVTH574D,112 uniquely combines 5 V-tolerant inputs, integrated bus hold, and industrial temperature range - making it optimal for legacy bus interfacing where input termination and mixed-voltage robustness are mandatory.

Availability

74LVTH574D,112 is available at Aetrix Electronics and suitable for industrial control systems, microprocessor bus expansion, and memory interface designs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74LVTH574D,112 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The 74LVTH574D,112 belongs to NXP's LVT/LVTH logic family, engineered for high-speed 3.3 V operation with backward compatibility to 5 V TTL systems - targeting board-level signal integrity and system-level interoperability in mixed-voltage digital infrastructure.

FAQ

What is the maximum clock frequency supported by the 74LVTH574D,112?

The 74LVTH574D,112 supports a maximum clock frequency of 150 MHz under recommended operating conditions (VCC = 3.0 V to 3.6 V). This value is derived from dynamic characterization in Table 7 of the NXP datasheet, where fmax is specified with defined load and test conditions. The 74LVTH574D,112 achieves this performance while maintaining setup/hold times as low as 2.0 ns and propagation delays down to 1.7 ns.

Does the 74LVTH574D,112 require external pull-up resistors on its D inputs?

No, the 74LVTH574D,112 does not require external pull-up resistors on its D0–D7 inputs because it integrates bus hold circuitry. Per Table 6, IBHL is 75–150 µA at VCC = 3.0 V, actively maintaining valid logic states on floating inputs. This feature is explicitly documented in the "Features and benefits" section and eliminates the need for external termination components - a key design advantage of the 74LVTH574D,112.

Can the 74LVTH574D,112 safely interface with 5 V logic signals?

Yes, the 74LVTH574D,112 supports 5 V-tolerant inputs: VI is rated up to 5.5 V per Table 5, and input clamping voltage (VIK) remains within safe limits (−1.2 V min) even under overvoltage. Its TTL-compatible thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) ensure reliable recognition of 5 V logic levels. This capability is confirmed in both the General Description and Features sections of the NXP datasheet for the 74LVTH574D,112.

What is the purpose of the OE pin on the 74LVTH574D,112?

The OE (output enable) pin on the 74LVTH574D,112 is an active-LOW control that independently places all eight Q0–Q7 outputs into high-impedance (OFF-state) regardless of clock activity or stored register state. When OE is HIGH, outputs are disabled and present negligible loading on the bus; when OE is LOW, registered data appears at Q0–Q7. This function is central to bus sharing and is validated in Table 3 (Function Table) and the General Description of the 74LVTH574D,112 datasheet.

Is the 74LVTH574D,112 pin-compatible with the standard 74LVT574D?

Yes, the 74LVTH574D,112 is pin-compatible with the 74LVT574D in the same SO20 package (SOT163-1), sharing identical pin configuration, numbering, and electrical pin functions as confirmed in Section 5.2 (Pin description) and Table 1 (Ordering information) of the NXP datasheet. Both devices use pins 1 (OE), 2–9 (D0–D7), 10 (GND), 11 (CP), 12–19 (Q0–Q7), and 20 (VCC) with identical roles - making the 74LVTH574D,112 a direct functional upgrade with added bus hold.