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NXP Semiconductors 74ABT574ADB,112
- Part No.:
- 74ABT574ADB,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74ABT574ADB,112.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,772
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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 5 V TTL-compatible systems. It features independent clock (CP) and active-Low output enable (OE), 8-bit data latching on rising CP edge, and drive capability up to 64 mA LOW-level output current at VCC = 4.5 V. It is used in microprocessor data bus buffering and address/data latch applications.
For engineers reviewing the 74ABT574ADB datasheet, 74ABT574ADB pinout, 74ABT574ADB application, or 74ABT574ADB equivalent, this device delivers verified 400 MHz maximum clock frequency, sub-5 ns propagation delays (tPLH/tPHL), power-on 3-state behavior, latch-up immunity >500 mA, and ESD protection exceeding 2000 V HBM - critical for robust digital interface design.
Technical Context
The 74ABT574ADB implements eight independent D-type flip-flops, each triggered on the Low-to-High transition of CP, with setup/hold times as low as 0.2 ns (tsu(L)) and −0.4 ns (th(L)). Its BiCMOS architecture enables simultaneous low static current (ICC ≤ 250 µA) and high dynamic drive (IOL = 64 mA).
All eight 3-state outputs are controlled collectively by OE, enabling full bus isolation without clock dependency. The SSOP20 package supports flow-through pinout (inputs on one side, outputs on the other), simplifying PCB routing for microprocessor data bus interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Type | Octal D-type positive-edge-triggered flip-flop with 3-state outputs |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL systems |
| Max Clock Frequency | 400 MHz at 25 °C - enables high-throughput data capture in fast buses |
| tPLH / tPHL | 3.0 / 3.4 ns typical - ensures tight timing margins in synchronous designs |
| IOL / IOH | 64 mA / −32 mA - drives heavily loaded 3-state buses and MOS memory loads |
| Operating Temperature | −40 °C to +85 °C - suitable for industrial-grade embedded control systems |
| ESD Protection | HBM >2000 V, MM >200 V - reduces risk of handling damage during assembly |
Pinout & Package
74ABT574ADB is housed in a plastic shrink small outline package (SSOP20) with 20 leads and 5.3 mm body width (SOT339-1). Pin pitch is 0.65 mm, and the package is lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-Low 3-state output enable | Asserting LOW enables all Q outputs; HIGH places them in high-impedance state independent of clock |
| 2–9 (D0–D7) | Data inputs | Synchronously latched on rising CP edge; require setup time ≥0.2 ns (LOW) or 0.6 ns (HIGH) |
| 10 (GND) | Ground reference | 0 V return path for logic and output drivers; must be low-impedance for noise immunity |
| 11 (CP) | Clock input | Rising-edge sensitive; minimum pulse width 0.7 ns HIGH/LOW ensures reliable triggering |
| 12–19 (Q0–Q7) | 3-state registered outputs | Reflect Dn state after CP edge when OE = LOW; tri-stated when OE = HIGH |
| 20 (VCC) | Positive supply | 4.5–5.5 V nominal; decoupling capacitor required near pin for stable switching performance |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Inputs (D0–D7) on left side, outputs (Q0–Q7) on right side - minimizes trace crossovers in microprocessor bus layouts |
| Power-on 3-state | Outputs default to high-impedance at power-up - prevents bus contention during system initialization |
| Latch-up protection | Exceeds 500 mA per JESD78B Class II Level A - ensures robustness against transient overcurrent events |
| Live insertion/extraction | Supported due to controlled output turn-on/off timing and input clamping - enables hot-swap board replacement |
| BiCMOS process | Combines bipolar speed and CMOS low static power - achieves ICC ≤ 30 µA in LOW-output mode |
Applications
| Microprocessor Data Bus Buffering | Memory Address Latching |
|---|---|
Use Scenario: Isolating and latching bidirectional data between a microprocessor and peripheral devices such as UARTs or ADCs. IC Role / Device Role / Timing Role: Acts as a registered 3-state buffer synchronized to CPU clock edges, holding data stable during read/write cycles. Use Value: Eliminates bus contention via OE-controlled tri-state and provides deterministic timing with 3.4 ns tPHL, enabling reliable 400 MHz burst transfers. |
Use Scenario: Capturing and holding memory address signals during multiplexed bus operation (e.g., in 8086-style systems). IC Role / Device Role / Timing Role: Latches address bits on rising CP edge while OE enables output drive to address decoder or memory chip select logic. Use Value: Ensures address stability across memory access windows using sub-5 ns propagation delay and 0.2 ns minimum setup time. |
| Industrial I/O Expansion Interface | Digital Control Signal Registration |
Use Scenario: Interfacing programmable logic controllers (PLCs) with external sensor arrays requiring synchronized sampling. IC Role / Device Role / Timing Role: Registers parallel sensor data on system clock edge and presents it to controller via 3-state bus under OE control. Use Value: Provides noise-immune signal capture with 2000 V HBM ESD rating and 64 mA drive strength for long-trace industrial backplanes. |
Use Scenario: Stabilizing control signals (e.g., PWM enable, reset, or mode selection) before delivery to power stages or analog subsystems. IC Role / Device Role / Timing Role: Synchronizes asynchronous control inputs to system clock domain and buffers them with glitch-free 3-state isolation. Use Value: Prevents metastability and race conditions using positive-edge D-flip-flop architecture and guaranteed hold time down to −0.4 ns. |
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 |
|---|---|---|---|
| SN74ABT574N | DIP20 package (SOT146-1); same electrical specs but larger footprint and no flow-through pinout | Preferred for through-hole prototyping or legacy board upgrades where SSOP rework is impractical | Select when mechanical compatibility with existing DIP sockets or manual soldering is required |
| 74LVTH574PW | Lower voltage (3.3 V), higher speed (tPLH = 2.5 ns typ), but reduced drive (IOL = 32 mA) and no power-on 3-state | Used in mixed-voltage 3.3 V/5 V systems where level translation is handled externally | Choose only if system operates at 3.3 V and requires faster timing; verify OE behavior during power ramp |
Compared with SN74ABT574N and 74LVTH574PW, the 74ABT574ADB uniquely combines SSOP20 space efficiency, flow-through routing, power-on 3-state safety, and 5 V TTL compatibility - making it optimal for new industrial PCB designs prioritizing density and bus integrity.
Availability
74ABT574ADB is available at Aetrix Electronics and suitable for microprocessor bus buffering, memory address latching, and industrial I/O expansion requiring stable component supply across extended temperature ranges.
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 in industrial control and embedded computing platforms.
FAQ
What is the function of the OE pin on the 74ABT574ADB?
The OE (Output Enable) pin on the 74ABT574ADB is an active-Low control that independently enables or disables all eight 3-state outputs. When OE is LOW, Q0–Q7 reflect the latched D0–D7 values; when OE is HIGH, outputs enter high-impedance state regardless of clock or data activity. This allows safe bus sharing without requiring clock synchronization for output disable.
Does the 74ABT574ADB support live insertion into a powered system?
Yes, the 74ABT574ADB supports live insertion and extraction due to its BiCMOS design, input clamping diodes, and controlled output turn-on/off timing. Its JESD78B Class II Level A latch-up immunity (>500 mA) and 2000 V HBM ESD rating ensure robustness during hot-swap operations in backplane or modular industrial systems.
What is the minimum setup time required for data inputs on the 74ABT574ADB?
The 74ABT574ADB specifies a minimum setup time of 0.2 ns for LOW-level data inputs (tsu(L)) and 0.6 ns for HIGH-level inputs (tsu(H)), measured relative to the rising edge of CP. These ultra-short setup requirements are enabled by its BiCMOS architecture and must be met to guarantee reliable latching across the full −40 °C to +85 °C operating range.
How does the 74ABT574ADB behave during power-up?
During power-up, the 74ABT574ADB exhibits power-on 3-state behavior: all outputs remain in high-impedance until VCC stabilizes and internal circuitry reaches valid operating voltage. This prevents bus contention and spurious signal assertion during system startup - a critical feature for reliable industrial controller boot sequences.
Can the 74ABT574ADB drive standard 50 Ω transmission lines directly?
No, the 74ABT574ADB is not designed for direct 50 Ω line driving. Its 64 mA LOW-level output current and 32 mA HIGH-level sink/source capability target 3-state bus loading (e.g., multiple TTL inputs or MOS memory address lines), not RF impedance matching. For 50 Ω lines, external series termination or dedicated line drivers are required.
74ABT574ADB,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74ABT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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,112 FAQ
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6.How does Aetrix verify that 74ABT574ADB,112 is sourced from the original manufacturer or authorized distributors?
All 74ABT574ADB,112 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,112 meets industry standards.
7.What is the process for return or replacement of 74ABT574ADB,112?
All 74ABT574ADB,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT574ADB,112, 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,112 part is unused and in its original packaging.
Return procedure for 74ABT574ADB,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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