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Home > Products > Integrated Circuits (ICs) > Logic > Flip Flops

NXP Semiconductors 74ABT574ADB,118

Name: 74ABT574ADB,118
Brand: NXP Semiconductors
SKU: 74ABT574ADB,118
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74ABT574ADB,118

Manufacturer:: NXP Semiconductors

Category:: Flip Flops

Package:: 20-SSOP (0.209", 5.30mm Width)

Datasheet:: 74ABT574ADB,118.pdf

Description:: IC FF D-TYPE SNGL 8BIT 20SSOP

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Product details

Overview

74ABT574ADB from NXP Semiconductors is an octal D-type edge-triggered flip-flop with 3-state outputs, designed for high-speed bus interfacing in digital systems. It features a rising-edge clock (CP), active-low output enable (OE), 8-bit parallel data storage, and operates over −40 °C to +85 °C at 4.5–5.5 V supply. It is used in microprocessor data bus latching and memory address/data buffering.

For engineers reviewing the 74ABT574ADB datasheet, 74ABT574ADB pinout, 74ABT574ADB application, or 74ABT574ADB equivalent, key selection considerations include its 3-state bus-driving capability, 400 MHz max clock frequency, 3.0 ns typical propagation delay, power-on 3-state behavior, and SSOP20 package compatibility with space-constrained PCB layouts.

Technical Context

The 74ABT574ADB implements eight independent D-type flip-flops, each triggered on the LOW-to-HIGH transition of CP, with data sampled one setup time before the clock edge. Its dual-control architecture separates clocking (CP) and output gating (OE), enabling independent register loading and bus release.

All eight 3-state outputs share a common OE input, allowing simultaneous bus disconnection without affecting internal state. The BiCMOS process delivers low static current (≤250 μA) and high sink/source drive (64 mA/−32 mA), supporting heavily loaded TTL and MOS buses.

Key Specifications

Parameter	Value and Actual Design Meaning
Function	Octal D-type flip-flop with 3-state outputs - stores 8 bits synchronously and drives shared data/address buses only when enabled.
Supply Voltage	4.5 V to 5.5 V - compatible with standard 5 V TTL logic domains and ensures stable operation across industrial temperature range.
Max Clock Frequency	400 MHz at 25 °C - enables high-throughput data capture in fast microprocessor and memory interface applications.
Propagation Delay (tPLH/tPHL)	3.0 ns typical (CP to Q) - supports sub-3 ns timing margins in critical synchronous paths.
Output Drive (IOL/IOH)	64 mA sink / −32 mA source - directly interfaces with legacy TTL loads and drives 50 pF buses without external buffers.
Operating Temperature	−40 °C to +85 °C - qualified for industrial-grade embedded control and communications equipment.
Input Clamping Voltage	−1.2 V (VIK) - protects against negative transients during live insertion or ESD events.

Pinout & Package

74ABT574ADB 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 automated assembly.

Pin/Terminal	Circuit Role	Design Meaning
1 (OE)	Active-low 3-state output enable	Asserting LOW enables all eight Q outputs; HIGH places them in high-impedance state - decouples device from bus without altering internal register contents.
2–9 (D0–D7)	Data inputs	Asynchronous parallel data inputs sampled on rising CP edge - accepts standard TTL-level signals with VIH ≥ 2.0 V and VIL ≤ 0.8 V.
10 (GND)	Ground reference	Primary 0 V return path for logic and output drivers - must be low-inductance connection to minimize ground bounce in high-speed switching.
11 (CP)	Clock pulse input	Rising-edge sensitive control signal - triggers simultaneous capture of all Dn inputs into respective flip-flops; requires minimum 2.0 ns pulse width.
12–19 (Q7–Q0)	3-state buffered outputs	Register outputs with tristate control - drive external buses only when OE = LOW; exhibit < 0.55 V VOL at 64 mA load.
20 (VCC)	Positive supply	5 V nominal power rail - requires local 100 nF ceramic decoupling near pin to suppress dynamic supply noise during output transitions.

Key Features

Feature	Design Value
Flow-through pinout (Dn on left, Qn on right)	Enables straight PCB trace routing between microprocessor data bus and peripheral latch - reduces crosstalk and layout complexity.
Power-on 3-state	Outputs remain in high-impedance state until VCC stabilizes - prevents bus contention during system power-up sequences.
Latch-up protection > 500 mA	Meets JESD78B Class II Level A - ensures robustness against transient-induced parasitic thyristor activation in noisy environments.
HBM ESD > 2000 V	Withstands human-body-model discharges per JESD22-A114F - supports safe handling and live insertion in field-replaceable modules.
Live insertion/extraction support	OE-controlled 3-state and power-on reset allow hot-swap capability in modular backplane systems without system reset.

Applications

Microprocessor Data Bus Latching	Memory Address Buffering
Use Scenario: Capturing and holding 8-bit data from an 8051 or Z80 CPU during multi-cycle memory read/write operations. IC Role / Device Role / Timing Role: Synchronous data register that samples CPU data on rising clock edge and holds it stable for slower peripheral access. Use Value: Eliminates need for external timing logic by providing edge-triggered storage with guaranteed setup/hold times (tsu = 1.0 ns, th = 1.0 ns).	Use Scenario: Isolating and driving 8-bit address lines between a microcontroller and multiple SRAM or EPROM devices. IC Role / Device Role / Timing Role: Bidirectional bus buffer controlled via OE, enabling shared address bus among multiple memory chips. Use Value: 64 mA output drive supports fan-out to ≥10 TTL loads; 3-state disable prevents address bus contention during chip select transitions.
Industrial I/O Expansion	Digital Signal Acquisition Interface
Use Scenario: Latching parallel sensor data (e.g., 8-channel ADC output) before serial transfer to a PLC or MCU. IC Role / Device Role / Timing Role: Input capture register synchronized to system clock, decoupled from downstream serial interface timing. Use Value: Power-on 3-state prevents spurious I/O activation; −40 °C to +85 °C rating ensures reliability in factory-floor environments.	Use Scenario: Interfacing high-speed digital test equipment (e.g., logic analyzer inputs) to a host controller's data bus. IC Role / Device Role / Timing Role: High-bandwidth data pipeline stage with minimal propagation delay (3.0 ns typ.) and precise edge alignment. Use Value: 400 MHz max clock frequency and 5 ns worst-case tPLH/tPHL support sampling rates up to 250 MSPS in pipelined acquisition chains.

Microprocessor Data Bus Latching

Memory Address Buffering

Use Scenario: Capturing and holding 8-bit data from an 8051 or Z80 CPU during multi-cycle memory read/write operations.

IC Role / Device Role / Timing Role: Synchronous data register that samples CPU data on rising clock edge and holds it stable for slower peripheral access.

Use Value: Eliminates need for external timing logic by providing edge-triggered storage with guaranteed setup/hold times (tsu = 1.0 ns, th = 1.0 ns).

Use Scenario: Isolating and driving 8-bit address lines between a microcontroller and multiple SRAM or EPROM devices.

IC Role / Device Role / Timing Role: Bidirectional bus buffer controlled via OE, enabling shared address bus among multiple memory chips.

Use Value: 64 mA output drive supports fan-out to ≥10 TTL loads; 3-state disable prevents address bus contention during chip select transitions.

Industrial I/O Expansion

Digital Signal Acquisition Interface

Use Scenario: Latching parallel sensor data (e.g., 8-channel ADC output) before serial transfer to a PLC or MCU.

IC Role / Device Role / Timing Role: Input capture register synchronized to system clock, decoupled from downstream serial interface timing.

Use Value: Power-on 3-state prevents spurious I/O activation; −40 °C to +85 °C rating ensures reliability in factory-floor environments.

Use Scenario: Interfacing high-speed digital test equipment (e.g., logic analyzer inputs) to a host controller's data bus.

IC Role / Device Role / Timing Role: High-bandwidth data pipeline stage with minimal propagation delay (3.0 ns typ.) and precise edge alignment.

Use Value: 400 MHz max clock frequency and 5 ns worst-case tPLH/tPHL support sampling rates up to 250 MSPS in pipelined acquisition chains.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
74ABT374ADB	Same function but non-flow-through pinout (inputs/outputs on same side); identical electrical specs and package.	Requires U-turn PCB routing; less optimal for microprocessor bus interface where D/Q separation simplifies layout.	Select 74ABT574ADB when minimizing trace length and crosstalk between processor and latch is critical.
SN74ABT574PWR	TSSOP20 package (SOT360-1, 4.4 mm width); otherwise identical logic, timing, and drive specs.	Smaller footprint and finer pitch - suitable for ultra-compact designs but requires tighter assembly process control.	Choose SN74ABT574PWR only if board area is constrained and TSSOP reflow capability is confirmed.

Compared with 74ABT374ADB, the 74ABT574ADB's flow-through pinout reduces interconnect inductance and improves signal integrity in high-speed bus applications; versus SN74ABT574PWR, the SSOP20 package offers greater solder joint reliability and easier inspection while maintaining compatibility with existing 74ABT574A footprints.

Availability

74ABT574ADB is available at Aetrix Electronics and suitable for industrial control systems, microprocessor peripheral interfacing, and digital test equipment requiring stable component supply, long-term lifecycle support, and consistent SSOP20 packaging.

Supply support for 74ABT574ADB 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 74ABT574ADB belongs to NXP's ABT-series advanced BiCMOS logic family, engineered for high-speed, low-power 5 V digital interfacing with robust bus-driving capability and industrial temperature resilience.

FAQ

What is the maximum clock frequency supported by the 74ABT574ADB?

The 74ABT574ADB supports a maximum clock frequency of 400 MHz at 25 °C and 5.0 V supply, with a minimum of 125 MHz across the full −40 °C to +85 °C operating range. This specification is validated under defined load conditions (50 pF, 500 Ω), and actual system performance depends on PCB layout, supply stability, and signal integrity. The 74ABT574ADB achieves this speed using BiCMOS process technology that balances bipolar switching speed with CMOS low-power characteristics.

Does the 74ABT574ADB have power-on reset functionality?

Yes, the 74ABT574ADB incorporates power-on reset behavior: its outputs default to high-impedance (3-state) upon power application until VCC reaches a valid operating level, preventing bus contention during startup. This feature is inherent to the internal circuit design and does not require external components. The 74ABT574ADB maintains this safe state regardless of OE or CP pin states during power ramp-up, ensuring predictable initialization in industrial control and embedded systems.

What is the purpose of the flow-through pinout in the 74ABT574ADB?

The flow-through pinout places data inputs (D0–D7) on pins 2–9 (left side) and corresponding outputs (Q0–Q7) on pins 12–19 (right side) of the SSOP20 package, enabling direct left-to-right signal routing across the IC. This minimizes trace length, reduces crosstalk, and simplifies PCB layout when interfacing with microprocessors or memory devices. The 74ABT574ADB's flow-through architecture eliminates the need for U-turn traces required by conventional pinouts like those in the 74ABT374A, improving signal integrity in high-speed digital designs.

Can the 74ABT574ADB drive standard TTL loads directly?

Yes, the 74ABT574ADB can directly drive standard TTL loads: its outputs deliver up to 64 mA sink current (IOL) and −32 mA source current (IOH) at VCC = 5.0 V, meeting or exceeding TTL interface requirements. It guarantees VOL ≤ 0.55 V at 64 mA and VOH ≥ 2.5 V at −3 mA, ensuring noise margins above 0.4 V for both logic levels. The 74ABT574ADB's BiCMOS output stage provides this drive strength without external buffers, making it suitable for interfacing with legacy TTL, LVTTL, and mixed-voltage systems.

Is the 74ABT574ADB suitable for live insertion in backplane systems?

Yes, the 74ABT574ADB supports live insertion and extraction per manufacturer documentation, enabled by its power-on 3-state behavior, latch-up immunity (>500 mA), and robust ESD protection (HBM > 2000 V). When inserted into a powered backplane, the OE-controlled 3-state outputs prevent bus contention, and internal clamping structures safely dissipate transient energy. This makes the 74ABT574ADB appropriate for modular industrial controllers and telecom line cards where field-replaceable units require hot-swap capability without system interruption.

74ABT574ADB,118 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: 74ABT

Package/Case:: 20-SSOP (0.209", 5.30mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Function:: Standard

Type:: D-Type

Output Type:: Tri-State, Non-Inverted

Number of Elements:: 1

Number of Bits per Element:: 8

Clock Frequency:: 400 MHz

Max Propagation Delay @ V, Max CL:: 4.7ns @ 5V, 50pF

Trigger Type:: Positive Edge

Current - Output High, Low:: 32mA, 64mA

Voltage - Supply:: 4.5V ~ 5.5V

Current - Quiescent (Iq):: 250 µA

Input Capacitance:: 3 pF

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SSOP

74ABT574ADB,118 FAQ

1.How can I place an order for 74ABT574ADB,118 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74ABT574ADB,118 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 74ABT574ADB,118 reliable?

The price and inventory of 74ABT574ADB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT574ADB,118 is usually 5 days.

3.What payment methods are accepted for 74ABT574ADB,118?

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74ABT574ADB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74ABT574ADB,118 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 74ABT574ADB,118?

For technical support, including 74ABT574ADB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT574ADB,118 requirements.

6.How does Aetrix verify that 74ABT574ADB,118 is sourced from the original manufacturer or authorized distributors?

All 74ABT574ADB,118 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 74ABT574ADB,118 meets industry standards.

7.What is the process for return or replacement of 74ABT574ADB,118?

All 74ABT574ADB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT574ADB,118, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 74ABT574ADB,118 part is unused and in its original packaging.

Return procedure for 74ABT574ADB,118:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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