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Texas Instruments SN74ABT574ADB
- Part No.:
- SN74ABT574ADB
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABT574ADB.pdf
- Description:
- D-TYPE FLIP-FLOPS
- Quantity:
- Payment:
- Shipping:
Inventory:6,160
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Product details
Overview
SN74ABT574ADB from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs in a 20-pin SSOP (DB) package. It provides high-drive capability (−32 mA IOH, 64 mA IOL), supports partial-power-down via Ioff, and operates across −40°C to 85°C at 4.5–5.5 V supply. It serves as a bus interface register in industrial control backplanes and data acquisition systems.
For engineers reviewing the SN74ABT574ADB datasheet, SN74ABT574ADB pinout, SN74ABT574ADB application, or SN74ABT574ADB equivalent, key selection criteria include its 150 MHz clock frequency, 1.0 ns setup time (low), 1.8 ns hold time, 3-state enable timing (tPZL = 2.1 ns), and compatibility with TTL-level inputs in 5-V digital systems.
Technical Context
This device implements eight independent D-type latches triggered on the rising edge of CLK, with synchronous data capture and asynchronous 3-state control via OE. Its output structure enables bidirectional bus driving without external pull-ups, leveraging high-impedance isolation during OE assertion.
The IC integrates Ioff circuitry to disable outputs during power-down, preventing backflow current when VCC = 0 V and VI/VO ≤ 4.5 V. Ground bounce (VOLP < 1 V) and latch-up immunity (>500 mA per JESD17) are specified for robust operation in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Octal D-type flip-flop with 3-state outputs - enables synchronized data latching and bus contention management. |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V TTL and CMOS system rails. |
| Max Clock Frequency | 150 MHz - supports high-speed data transfer in real-time control interfaces. |
| Output Drive | −32 mA IOH / 64 mA IOL - drives heavy capacitive loads (e.g., 50 pF buses) without signal degradation. |
| Setup/Hold Times | tsu(L) = 1.5 ns, th = 1.8 ns - tight timing margins for reliable synchronization in fast logic designs. |
| Ioff Support | Active at VCC = 0 V - prevents damaging current flow during hot-swap or partial-power-down sequences. |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded applications. |
Pinout & Package
SN74ABT574ADB uses a 20-pin SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch, 7.4 mm × 5.3 mm body size, and 2.0 mm max height per JEDEC MO-150. Pin 1 index is marked by a beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–8 (1D–8D) | Data Inputs | Synchronous D inputs for each of eight flip-flops; sampled on CLK↑. |
| 9 | GND | Ground reference for all internal logic and output drivers. |
| 10 | VCC | Positive supply rail (4.5–5.5 V); powers logic core and output buffers. |
| 11–18 (1Q–8Q) | 3-State Outputs | Registered Q outputs; high-impedance when OE = high. |
| 19 | CLK | Clock input; rising-edge trigger synchronizes all eight D-to-Q transfers. |
| 20 | OE | Output-enable control; active-low (OE = low → outputs enabled). |
Key Features
| Feature | Design Value |
|---|---|
| High-Drive Outputs | Delivers −32 mA source / 64 mA sink per output - eliminates need for external bus drivers in dense PCB layouts. |
| Ioff Partial-Power-Down | Blocks reverse current when powered off - enables safe insertion/removal in live-backplane systems. |
| Low Ground Bounce | VOLP < 1 V at 5 V/25°C - maintains signal integrity during simultaneous output switching. |
| Latch-Up Immunity | Exceeds 500 mA per JESD17 - ensures reliability in electrically harsh industrial settings. |
| ESD Protection | 2000-V HBM / 200-V MM - reduces risk of handling damage during assembly and test. |
Applications
| Industrial Backplane Interface | Data Acquisition Buffering |
|---|---|
Use Scenario: Interfacing microcontroller GPIOs to a shared 8-bit parallel bus in programmable logic controllers. IC Role / Device Role / Timing Role: Synchronizes and isolates control signals between CPU and peripheral modules using edge-triggered latching and 3-state bus arbitration. Use Value: Prevents bus contention during read/write cycles while supporting 150 MHz burst transfers. | Use Scenario: Capturing analog-to-digital converter (ADC) parallel output data before serial transmission. IC Role / Device Role / Timing Role: Acts as a pipeline register that holds sampled ADC words until host processor reads them via OE-controlled bus access. Use Value: Eliminates timing skew between conversion completion and host read, enabling deterministic sampling intervals. |
| Test Equipment Digital I/O Port | Legacy System Bus Extender |
Use Scenario: Expanding digital I/O capacity in automated test equipment with mixed-voltage subsystems. IC Role / Device Role / Timing Role: Provides level-shifted, isolated 8-bit I/O port with independent OE control per channel group. Use Value: Allows safe interfacing between 5-V logic and 3.3-V FPGA controllers without external level translators. | Use Scenario: Adding memory-mapped I/O registers to aging 8051-based instrumentation systems. IC Role / Device Role / Timing Role: Functions as a working register mapped into the microcontroller's external address space via address decoding and OE gating. Use Value: Enables software-configurable I/O expansion without modifying legacy firmware timing constraints. |
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 |
|---|---|---|---|
| SN74ABT574ADWR | SOIC-20 package (7.5 mm × 5.3 mm), higher θJA (58°C/W), same electrical specs. | Better thermal dissipation in low-airflow enclosures; requires larger PCB footprint than SSOP. | Select when board layout allows SOIC and thermal margin is critical over density. |
| SN74ABT574ANSR | SOP-20 package (7.6 mm × 5.3 mm), identical timing and drive, RoHS-compliant NIPDAU finish. | Compatible with wave-solder processes; slightly lower Ioff leakage (±100 μA vs ±500 μA). | Prefer for high-volume manufacturing where SOP tape-and-reel logistics align with existing SMT lines. |
Compared with SN74ABT574ADWR and SN74ABT574ANSR, the SN74ABT574ADB offers the smallest PCB footprint (SSOP-20), making it optimal for space-constrained industrial modules where thermal load remains within limits under forced convection.
Availability
SN74ABT574ADB is available at Aetrix Electronics and suitable for industrial automation, test equipment, and legacy system upgrades requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for SN74ABT574ADB 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
Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The ABT logic family-including SN74ABT574ADB-is engineered for high-speed, high-drive 5-V TTL-compatible applications with robust noise immunity and power-down safety features.
FAQ
What is the maximum clock frequency supported by SN74ABT574ADB?
The SN74ABT574ADB supports a maximum clock frequency of 150 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C). This value is guaranteed across the full industrial temperature range (−40°C to +85°C) and applies to both data capture and output enable/disable transitions, ensuring deterministic timing in real-time control loops.
Does SN74ABT574ADB support partial-power-down operation?
Yes, SN74ABT574ADB includes Ioff circuitry that disables outputs when VCC = 0 V and any input or output voltage is ≤ 4.5 V. This feature prevents damaging current backflow during hot-swap or staged power sequencing, making SN74ABT574ADB suitable for modular backplane architectures where subsystems power up/down independently.
What is the function of the OE pin on SN74ABT574ADB?
The OE (output-enable) pin on SN74ABT574ADB is an active-low control that places all eight Q outputs in high-impedance state when asserted high. It operates asynchronously-OE does not affect internal flip-flop states-allowing data retention or new loading while outputs remain isolated from the bus, which is essential for bidirectional data transfer protocols.
Can SN74ABT574ADB drive a 50-pF capacitive load reliably?
Yes, SN74ABT574ADB is characterized for CL = 50 pF in its switching specifications. Propagation delays (tPLH/tPHL ≤ 6.8 ns) and enable/disable times (tPZL/tPHZ ≤ 6.7 ns) are guaranteed under this load, and its 64-mA low-level drive ensures clean signal edges even with PCB trace capacitance and connector parasitics typical in industrial backplanes.
Is SN74ABT574ADB pin-compatible with other packages in the SN74ABT574A family?
Yes, all SN74ABT574A variants-including SN74ABT574ADB, SN74ABT574ADWR, and SN74ABT574ANSR-share identical 20-pin functional pinouts per JEDEC MO-150/MO-153 footprints. Signal assignments (D/Q/CLK/OE/VCC/GND) are consistent across SSOP, SOIC, and SOP packages, enabling drop-in replacement when mechanical constraints allow.
SN74ABT574ADB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 200 MHz
- Max Propagation Delay @ V, Max CL:
- 6.6ns @ 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:
- 3.5 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74ABT574ADB FAQ
1.How can I place an order for SN74ABT574ADB through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT574ADB 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 SN74ABT574ADB reliable?
The price and inventory of SN74ABT574ADB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT574ADB is usually 5 days.
3.What payment methods are accepted for SN74ABT574ADB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT574ADB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT574ADB?
SN74ABT574ADB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT574ADB 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 SN74ABT574ADB?
For technical support, including SN74ABT574ADB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT574ADB requirements.
6.How does Aetrix verify that SN74ABT574ADB is sourced from the original manufacturer or authorized distributors?
All SN74ABT574ADB 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 SN74ABT574ADB meets industry standards.
7.What is the process for return or replacement of SN74ABT574ADB?
All SN74ABT574ADB units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT574ADB, 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 SN74ABT574ADB part is unused and in its original packaging.
Return procedure for SN74ABT574ADB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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