NXP Semiconductors 74LVTH574DB,112

Overview

74LVTH574DB,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 provides 8-bit registered data latching and bus-isolated output driving for microprocessor data buses, with propagation delay as low as 1.7 ns (t_PLH, V_CC = 3.0–3.6 V) and maximum clock frequency of 150 MHz.

For engineers reviewing the 74LVTH574DB,112 datasheet, 74LVTH574DB,112 pinout, 74LVTH574DB,112 application, or 74LVTH574DB,112 equivalent, this device is selected for high-speed 3.3 V bus interfacing where latch timing integrity, 3-state bus contention control, and TTL-level compatibility with 5 V systems are required.

Technical Context

The 74LVTH574DB,112 implements eight independent D-type flip-flops synchronized to the rising edge of CP, each capturing D_n one setup time before the clock transition. Its 3-state output buffers are fully decoupled from clock operation and activated solely by the active-low OE signal.

It features bus hold circuitry on all data inputs (D₀–D₇), eliminating external pull-up resistors for unused inputs, and supports live insertion/extraction. Input and output voltage levels comply with TTL thresholds while operating at 3.3 V V_CC, enabling direct interface to both 3.3 V and 5 V logic systems.

Key Specifications

Pinout & Package

74LVTH574DB,112 is housed in a plastic shrink small outline package (SSOP20) with 20 leads, body width 5.3 mm (SOT339-1), optimized for high-density PCB layouts and thermal performance in industrial applications.

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 74ALVCH162244DGGR, the 74LVTH574DB,112 uniquely combines 3.3 V operation, TTL-compatible I/O, bus hold, live insertion, and true edge-triggered latching-making it irreplaceable in industrial microprocessor bus interfaces requiring deterministic timing and robust floating-input handling.

Availability

74LVTH574DB,112 is available at Aetrix Electronics and suitable for industrial control systems, test equipment design, and embedded microprocessor bus interfacing requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for 74LVTH574DB,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 leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in high-performance logic and interface ICs.

The 74LVTH574DB,112 belongs to NXP's LVT/LVTH logic family, engineered specifically for high-speed 3.3 V bus interfacing in industrial and computing systems where TTL compatibility, latch timing precision, and ruggedness are mandatory.

FAQ

What is the recommended operating voltage range for the 74LVTH574DB,112?

The 74LVTH574DB,112 is specified for operation from 2.7 V to 3.6 V. Operation outside this range may cause unreliable latching, increased propagation delay variation, or violation of absolute maximum ratings. The device achieves its rated 150 MHz f_max and 1.7 ns t_PLH within the 3.0–3.6 V sub-range, making 3.3 V the optimal nominal supply.

Does the 74LVTH574DB,112 support 5 V tolerant inputs?

Yes, the 74LVTH574DB,112 accepts input voltages up to 5.5 V (VI max), enabling direct interface with 5 V microprocessors and peripherals without external level-shifting circuitry. This is achieved through internal input clamping and TTL-compatible threshold design, confirmed in Table 5 (Recommended Operating Conditions) and Table 4 (Limiting Values).

How does the bus hold feature work on the 74LVTH574DB,112 data inputs?

The 74LVTH574DB,112 integrates bus hold circuitry on all D₀–D₇ inputs, providing ±75 µA to ±150 µA weak pull-up/pull-down current (per Table 6) to maintain a valid logic state when inputs float. This eliminates the need for external pull-up resistors and prevents undefined states during power-up, hot-swap, or unconnected pins-critical for industrial I/O expansion.

What is the maximum output drive capability of the 74LVTH574DB,112?

The 74LVTH574DB,112 delivers ±32 mA per output (I_OH/I_OL), verified at V_CC = 3.0 V and Tamb = −40 °C to +85 °C (Table 5). At 32 mA sink, VOL remains ≤0.5 V, and at 32 mA source, VOH stays ≥2.0 V (Table 6), ensuring reliable signaling into heavy capacitive or resistive bus loads common in microprocessor and memory interfaces.

Is the 74LVTH574DB,112 pin-compatible with other packages in the same family?

Yes-the 74LVTH574DB,112 (SSOP20, SOT339-1) shares identical pinout and functionality with the SO20 (74LVTH574D, SOT163-1), TSSOP20 (74LVTH574PW, SOT360-1), and DHVQFN20 (74LVTH574BQ, SOT764-1) variants. All share the same pin assignment (OE=1, D0–D7=2–9, GND=10, CP=11, Q0–Q7=12–19, V_CC=20), enabling drop-in replacement across package types without layout changes.