NXP Semiconductors 74LVT574DB,118

Overview

74LVT574DB,118 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 delays as low as 1.7 ns (t_PLH) at 3.0–3.6 V and f_max = 150 MHz. Designed for high-speed 3.3 V systems interfacing to 5 V buses, it features bus hold on inputs and power-up 3-state.

For engineers reviewing the 74LVT574DB,118 datasheet, 74LVT574DB,118 pinout, 74LVT574DB,118 application, or 74LVT574DB,118 equivalent, key selection criteria include its 20-pin SSOP package, TTL-compatible I/O levels, 32 mA output drive capability, −40 °C to +85 °C industrial temperature range, and bus-hold input protection eliminating external pull-ups.

Technical Context

This device implements eight independent D-type flip-flops synchronized to a common rising-edge clock (CP), each feeding a dedicated 3-state output buffer. The output enable (OE) is active-low and operates asynchronously-asserting OE HIGH places all Q0–Q7 outputs in high-impedance regardless of clock state or stored data.

It supports mixed-voltage interfacing: inputs tolerate up to 5.5 V, outputs swing rail-to-rail within V_CC = 2.7–3.6 V, and bus-hold circuitry maintains valid logic states on unused Dn inputs without external resistors. Latch-up protection exceeds JESD78 Class II (500 mA), and ESD robustness meets HBM >2000 V and MM >200 V.

Key Specifications

Pinout & Package

74LVT574DB,118 uses the SSOP20 (SOT339-1) package: plastic shrink small outline, 20 leads, body width 5.3 mm, 0.65 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVTH574DB,118, the 74LVT574DB,118 offers sufficient drive for most 3.3 V bus loads while consuming less supply current in active mode; versus SN74LVC574APW, it delivers superior noise immunity and layout simplicity via integrated bus-hold, eliminating two external resistors per unused input.

Availability

74LVT574DB,118 is available at Aetrix Electronics and suitable for industrial control systems, embedded microprocessor interfaces, and memory subsystems requiring stable component supply, long-term lifecycle support, and guaranteed 3.3 V logic compatibility.

Supply support for 74LVT574DB,118 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with leadership in high-performance logic and interface ICs.

The 74LVT574DB,118 belongs to NXP's LVT (Low-Voltage TTL) logic family, engineered for high-speed 3.3 V operation with backward compatibility to 5 V systems-targeting bus interface, data capture, and signal conditioning in resource-constrained embedded platforms.

FAQ

What is the maximum clock frequency supported by the 74LVT574DB,118?

The 74LVT574DB,118 supports a maximum clock frequency of 150 MHz under recommended operating conditions (V_CC = 3.0 V to 3.6 V). This specification is validated across the full industrial temperature range (−40 °C to +85 °C) and reflects guaranteed timing performance with proper signal integrity and load conditions. The 74LVT574DB,118 achieves this using optimized internal propagation paths and low-skew clock distribution.

Does the 74LVT574DB,118 require external pull-up resistors on unused data inputs?

No, the 74LVT574DB,118 does not require external pull-up resistors on unused D0–D7 inputs because it integrates bus-hold circuitry. This feature actively maintains the last-valid logic state on floating inputs with ±75 µA to ±150 µA holding current, eliminating risk of undefined states and simplifying PCB layout. This behavior is confirmed in the Static Characteristics table (IBHL/IBHH parameters) of the 74LVT574DB,118 datasheet.

Can the 74LVT574DB,118 safely interface with a 5 V bus while operating at 3.3 V V_CC?

Yes, the 74LVT574DB,118 can safely interface with a 5 V bus while powered at 3.3 V. Its inputs tolerate up to 5.5 V, and its 3-state outputs exhibit no bus current loading when tied to a 5 V line-verified by the "No bus current loading when output is tied to 5 V bus" feature and limiting values (V_O = −0.5 V to +7.0 V). This eliminates risk of reverse current injection and enables mixed-voltage system design without level shifters.

What is the power-up behavior of the 74LVT574DB,118 outputs?

At power-up, the 74LVT574DB,118 outputs enter a high-impedance (3-state) condition regardless of OE or CP state-a feature explicitly documented as "Power-up 3-state." This prevents bus contention during system initialization and ensures deterministic startup behavior. The 74LVT574DB,118 maintains this state until OE is actively driven LOW and a valid CP edge occurs, making it safe for hot-plug and multi-drop bus architectures.

Is the 74LVT574DB,118 pin-compatible with other packages in the same family?

Yes, the 74LVT574DB,118 (SSOP20) shares identical pinout and functionality with the SO20 (74LVT574D), TSSOP20 (74LVT574PW), and DHVQFN20 (74LVT574BQ) variants. All versions use the same pin configuration shown in Figure 4 of the datasheet: OE at pin 1, D0–D7 at pins 2–9, GND at pin 10, CP at pin 11, Q0–Q7 at pins 12–19, and V_CC at pin 20. This allows drop-in replacement across package types without PCB redesign.