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Texas Instruments SN74ABT574ADBR
- Part No.:
- SN74ABT574ADBR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABT574ADBR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,307
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Product details
Overview
SN74ABT574ADBR from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs in a 20-pin SSOP (DB) package. It features high-drive capability (−32 mA IOH, 64 mA IOL), Ioff support for partial-power-down mode, and operates across −40°C to 85°C. It is used in bidirectional bus drivers and I/O port buffering in industrial control and data acquisition systems.
For engineers reviewing the SN74ABT574ADBR datasheet, SN74ABT574ADBR pinout, SN74ABT574ADBR application, or SN74ABT574ADBR equivalent, key selection considerations include its 150 MHz clock frequency, 3.3 ns minimum CLK pulse width, 1.0 ns setup time (high-level data), 1.5 ns setup time (low-level data), and 1.8 ns hold time - all specified at VCC = 5 V and TA = 25°C.
Technical Context
This device implements eight independent positive-edge-triggered D flip-flops with synchronous data capture on CLK↑ and asynchronous 3-state output control via OE. Each Q output reflects the corresponding D input state after the rising clock edge, while OE enables or disables all outputs simultaneously without affecting internal latch operation.
It supports hot-insertion and partial-power-down via Ioff circuitry that limits current backflow when VCC = 0 V and VI/VO ≤ 4.5 V. Output ground bounce (VOLP) is specified <1 V at VCC = 5 V and TA = 25°C, and latch-up performance exceeds 500 mA per JEDEC JESD17.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Octal positive-edge-triggered D-type flip-flop with 3-state outputs |
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and ABT logic families |
| Max Clock Frequency | 150 MHz - supports high-speed synchronous data latching in bus interface applications |
| Output Drive | −32 mA IOH / 64 mA IOL - drives heavy capacitive loads or low-impedance buses without external buffers |
| Propagation Delay | tPLH/tPHL ≤ 6.8/7.1 ns (CLK to Q, CL = 50 pF) - enables timing-critical register staging in pipeline designs |
| Ioff Current | ±100 μA max at VCC = 0 - prevents damaging back-current during power sequencing or hot-swap events |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded systems and automation equipment |
Pinout & Package
SN74ABT574ADBR uses a 20-pin SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch, 7.4 mm × 5.3 mm body size, and maximum height of 2.0 mm. Pin 1 is located at the top-left corner with index marking in the upper-left quadrant of the tape reel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low control: drives all Q outputs to high-impedance when high; no effect on internal flip-flop state |
| 2–9 | 1D–8D | Data inputs for each of eight D-type flip-flops; sampled on rising CLK edge |
| 10 | GND | Ground reference for all internal circuitry and output drivers |
| 11 | VCC | Positive supply (4.5–5.5 V); powers logic core and output drivers |
| 12–19 | 1Q–8Q | Registered outputs; reflect D-input states after CLK↑, tri-stated when OE is high |
| 20 | CLK | Clock input; positive-edge sensitive; triggers simultaneous capture of all eight D inputs |
Key Features
| Feature | Design Value |
|---|---|
| High-Drive Outputs | −32 mA source / 64 mA sink capability enables direct driving of 50-pF+ buses without buffer stages |
| Ioff Partial-Power-Down | Prevents current backflow when powered down, supporting live insertion and safe system power sequencing |
| Low Ground Bounce | VOLP <1 V at VCC = 5 V ensures signal integrity during simultaneous output switching in dense PCB layouts |
| Robust ESD Protection | 2000-V HBM and 200-V MM ratings reduce susceptibility to handling damage in manufacturing environments |
| Latch-Up Immunity | Exceeds 500 mA per JEDEC JESD17 - eliminates risk of destructive latch-up under transient overvoltage conditions |
Applications
| Industrial Bus Interface | Programmable Logic I/O Expansion |
|---|---|
|
Use Scenario: Isolating and latching parallel data between a microcontroller and legacy industrial fieldbus peripherals (e.g., Modbus RTU slave interfaces). IC Role / Device Role / Timing Role: Acts as an octal registered transceiver, synchronizing asynchronous peripheral data to the MCU clock domain while enabling/disabling bus access via OE. Use Value: Eliminates need for discrete pull-up resistors or level-shifting buffers due to high drive strength and 5-V TTL compatibility. |
Use Scenario: Expanding GPIO count on FPGA or CPLD development boards where dedicated I/O pins are limited. IC Role / Device Role / Timing Role: Provides synchronized, edge-triggered input capture and output latching with independent OE control for multiplexed peripheral access. Use Value: Enables deterministic timing alignment across eight signals using a single clock edge, reducing skew vs. software-based bit-banging. |
| Test Equipment Data Capture | Digital Signal Acquisition Buffer |
|
Use Scenario: Capturing parallel sensor output streams (e.g., 8-bit ADC results) in automated test equipment with precise timestamping. IC Role / Device Role / Timing Role: Latches analog-to-digital conversion results on CLK↑ and holds stable values until read by host controller via 3-state outputs. Use Value: Guarantees glitch-free sampling with 1.0 ns setup time (high-level data), supporting sub-10 ns timing margins in high-speed test fixtures. |
Use Scenario: Buffering real-time digital audio or instrumentation data before serial transmission over SPI/I²C. IC Role / Device Role / Timing Role: Serves as a temporary holding register, decoupling bursty acquisition from slower serial interface timing constraints. Use Value: Reduces host processor interrupt load by allowing batch reads of all eight bits with one OE assertion cycle. |
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 | Same logic function and electrical specs; packaged in SOIC (DW) with 1.27 mm pitch and 2.65 mm height | Preferred for through-hole prototyping or legacy board designs requiring wider lead spacing | Select when board layout accommodates larger SOIC footprint and hand-soldering is required |
| SN74ABT574ANSR | Identical functionality; uses SOP (NS) package with 1.27 mm pitch but 1.75 mm body height and different thermal resistance (60°C/W vs. DB's 70°C/W) | Better suited for space-constrained consumer electronics where SOP's lower profile reduces Z-height | Choose when vertical clearance is critical and thermal load remains within 60°C/W derating limits |
Compared with SN74ABT574ADWR and SN74ABT574ANSR, the SN74ABT574ADBR offers the smallest PCB footprint (7.4 mm × 5.3 mm) and highest pin density among production variants, making it optimal for compact industrial modules where board area is constrained but 5-V bus drive and timing precision remain essential.
Availability
SN74ABT574ADBR is available at Aetrix Electronics and suitable for industrial bus interface, programmable logic I/O expansion, and test equipment data capture requiring stable component supply and long-term manufacturability.
Supply support for SN74ABT574ADBR 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 specializing in analog, embedded processing, and logic solutions with over 50 years of innovation in industrial and automotive electronics.
The SN74ABT574A family was designed to deliver robust, high-speed 5-V TTL-compatible bus interfacing with enhanced noise immunity and power-down safety for mission-critical industrial control systems.
FAQ
What is the maximum clock frequency supported by the SN74ABT574ADBR?
The SN74ABT574ADBR supports a maximum clock frequency of 150 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C). This rating is validated with CL = 50 pF and accounts for propagation delays up to 6.8 ns (tPLH) and 7.1 ns (tPHL), ensuring reliable edge-triggered operation in high-speed synchronous systems.
How does the Ioff feature protect the SN74ABT574ADBR during partial power-down?
The Ioff circuitry in the SN74ABT574ADBR disables all outputs when VCC = 0 V, limiting current backflow to ±100 μA maximum even if input or output pins are driven to 4.5 V. This prevents damage during hot-swap events or staggered power sequencing in multi-rail systems, a key requirement for industrial backplane designs.
Can the SN74ABT574ADBR be used with 3.3-V logic systems?
No - the SN74ABT574ADBR is specified only for 4.5 V to 5.5 V supply operation and requires TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max). Direct connection to 3.3-V logic without level translation risks unreliable switching and violates recommended operating conditions.
What is the purpose of the OE pin on the SN74ABT574ADBR?
The OE (Output Enable) pin on the SN74ABT574ADBR is an active-low control that places all eight Q outputs in high-impedance state when asserted high. It operates independently of clock and data, allowing bus sharing without disrupting internal flip-flop states - essential for bidirectional data transfer and multi-drop bus architectures.
Does the SN74ABT574ADBR require external pull-up resistors on the OE pin?
Yes - to ensure the outputs enter high-impedance state during power-up or power-down, OE should be tied to VCC via a pull-up resistor. The minimum value depends on the driver's current-sinking capability; TI recommends verifying against the specific driver's IOH specification to avoid unintended OE activation.
SN74ABT574ADBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
SN74ABT574ADBR FAQ
1.How can I place an order for SN74ABT574ADBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT574ADBR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of SN74ABT574ADBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT574ADBR is usually 5 days.
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SN74ABT574ADBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT574ADBR 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 SN74ABT574ADBR?
For technical support, including SN74ABT574ADBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT574ADBR requirements.
6.How does Aetrix verify that SN74ABT574ADBR is sourced from the original manufacturer or authorized distributors?
All SN74ABT574ADBR 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 SN74ABT574ADBR meets industry standards.
7.What is the process for return or replacement of SN74ABT574ADBR?
All SN74ABT574ADBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT574ADBR, 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 SN74ABT574ADBR part is unused and in its original packaging.
Return procedure for SN74ABT574ADBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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