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Texas Instruments SN74ABT273DB
- Part No.:
- SN74ABT273DB
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- -
- Datasheet:
-
SN74ABT273DB.pdf
- Description:
- D FLIP-FLOP, ABT SERIES, 1-FUNC,
- Quantity:
- Payment:
- Shipping:
Inventory:2,662
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Product details
Overview
SN74ABT273DB from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with asynchronous clear, designed for high-speed data latching and storage in 5-V digital systems. It features 8-bit parallel register functionality, –32-mA high-drive IOH and 64-mA IOL output capability, and operates across –40°C to 85°C. It is widely used in address/data buffering, shift register stages, and pattern generation circuits.
For engineers reviewing the SN74ABT273DB datasheet, SN74ABT273DB pinout, SN74ABT273DB application, or SN74ABT273DB equivalent, key selection considerations include its 20-pin SSOP (DB) package, 150-MHz maximum clock frequency, 2.5-ns typical tPLH propagation delay, and compatibility with TTL-level input thresholds and 5-V CMOS logic interfaces.
Technical Context
The SN74ABT273DB implements eight independent D-type flip-flops sharing a common clock (CLK) and asynchronous clear (CLR) input. Each stage transfers data from D to Q on the rising edge of CLK, with setup time (tsu = 2.5 ns) and hold time (th = 1.2 ns) specified at VCC = 5 V and TA = 25°C. CLR overrides clocking and forces Q low asynchronously.
Its EPIC-II™ BiCMOS process enables high-output drive while maintaining low power dissipation and robust latch-up immunity (>500 mA per JESD-17). Output ground bounce (VOLP) remains below 1 V at 5 V supply, supporting noise-tolerant operation in dense PCB layouts with fast switching loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Octal D-type flip-flop with asynchronous clear - enables synchronized 8-bit data capture and reset in single-cycle control paths. |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V TTL/CMOS bus systems and tolerant of nominal rail variation. |
| Max Clock Frequency | 150 MHz - supports high-throughput register staging in memory interfaces and pipeline registers. |
| tPLH / tPHL | 2.5 ns / 3.3 ns (min), 6.5 ns / 7.3 ns (max) - ensures sub-7-ns worst-case propagation for timing-critical synchronous designs. |
| I/O Drive Strength | –32 mA IOH, 64 mA IOL - drives heavy capacitive loads (e.g., backplane traces or multiple inputs) without external buffers. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control, test equipment, and communications infrastructure. |
| Package | 20-pin SSOP (DB), 0.65-mm pitch, 7.4 mm × 5.3 mm footprint - surface-mount compatible with automated assembly and space-constrained layouts. |
Pinout & Package
SN74ABT273DB uses a 20-pin Shrink Small-Outline Package (SSOP, DB), measuring 7.4 mm × 5.3 mm with 0.65-mm lead pitch and maximum height of 2.0 mm. Pin 1 is located at the top-left corner with index marking adjacent to lead 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLR | Asynchronous active-low clear - forces all Q outputs low regardless of clock state; requires pull-up for static high operation. |
| 2–9, 11–18 | D1–D8, Q1–Q8 | Eight independent D inputs and Q outputs - arranged in interleaved order (D1,Q1,D2,Q2,...) to minimize trace coupling in layout. |
| 10 | GND | Ground reference - dedicated pin for low-impedance return path; must be connected to system ground plane. |
| 19 | VCC | Positive supply - decoupling capacitor (0.1 µF ceramic) required within 5 mm for stable high-speed operation. |
| 20 | CLK | Global clock input - edge-sensitive rising transition triggers simultaneous sampling of all D inputs to Q outputs. |
Key Features
| Feature | Design Value |
|---|---|
| High-Drive Outputs | –32 mA IOH / 64 mA IOL supports direct driving of 50-pF loads at 150 MHz without signal degradation. |
| Low Propagation Delay | Typical tPLH = 2.5 ns enables tight timing margins in multi-stage pipelined logic and address latch chains. |
| Robust ESD/Latch-up | Latch-up immunity >500 mA per JESD-17 and ±2-kV HBM ESD rating ensure reliability in handling and board-level operation. |
| Output Ground Bounce Control | VOLP < 1 V at 5 V/25°C reduces switching noise coupling into analog sections or adjacent high-speed signals. |
| TTL-Compatible Inputs | VIH = 2 V, VIL = 0.8 V allows seamless interfacing with legacy 5-V TTL families without level-shifting. |
Applications
| Memory Address Latching | Industrial Bus Interface |
|---|---|
|
Use Scenario: Capturing microprocessor address bus values during memory read/write cycles in 8-bit embedded controllers. IC Role / Device Role / Timing Role: Acts as an edge-triggered address register, holding stable address bits while data transfers occur. Use Value: Eliminates need for external glue logic by providing deterministic 8-bit parallel capture synchronized to CPU clock edges. |
Use Scenario: Buffering and isolating parallel control signals between PLC I/O modules and fieldbus master controllers. IC Role / Device Role / Timing Role: Serves as a synchronized output latch, ensuring glitch-free assertion of relay driver enable lines. Use Value: High-current drive (64 mA) directly drives optocoupler LEDs or small-signal MOSFET gates without buffer stages. |
| Test Equipment Pattern Generation | Digital Signal Processing Pipeline |
|
Use Scenario: Generating precise stimulus waveforms in automated test equipment (ATE) for IC functional validation. IC Role / Device Role / Timing Role: Functions as a programmable pattern register, updated via parallel load and clocked to output pins. Use Value: 150-MHz max clock rate supports generation of high-frequency digital test vectors with sub-7-ns timing resolution. |
Use Scenario: Holding intermediate results between processing stages in fixed-point DSP subsystems using discrete logic. IC Role / Device Role / Timing Role: Provides pipeline register stage with zero hold-time requirement (th = 1.2 ns) for relaxed timing closure. Use Value: Low propagation delay and TTL-compatible inputs simplify integration with legacy ALU or accumulator blocks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT273DW | Same logic function and electrical specs, but in 20-pin SOIC (DW) package (7.5 mm × 12.8 mm, 1.27-mm pitch). | SOIC offers easier manual prototyping and higher thermal mass; SSOP (DB) provides 40% smaller footprint for high-density boards. | Select SN74ABT273DW for through-hole-compatible rework or lower-cost assembly; choose SN74ABT273DB for space-constrained production designs. |
| SN74ACT273N | AC-family variant with lower drive (–24 mA / 24 mA), higher speed (tPLH = 2.3 ns typ), and wider VCC range (4.5–5.5 V same, but AC supports 3.3 V variants). | ACT version consumes less dynamic power but lacks ABT's high-current drive; unsuitable for driving heavy capacitive loads. | Choose SN74ACT273N only when lower power and marginally faster propagation are prioritized over output strength. |
Compared with SN74ABT273DW and SN74ACT273N, the SN74ABT273DB uniquely balances high-output drive, compact SSOP packaging, and industrial temperature range-making it optimal for space-limited, noise-sensitive, and load-heavy 5-V digital systems where robustness and layout efficiency are critical.
Availability
SN74ABT273DB is available at Aetrix Electronics and suitable for industrial control systems, automated test equipment, and digital communication interface design requiring stable component supply and long-term manufacturing continuity.
Supply support for SN74ABT273DB 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 decades of experience in high-reliability logic families.
The SN74ABT273DB belongs to TI's ABT-series advanced bi-directional bus transceivers and registers, engineered for high-speed, high-drive 5-V digital systems in industrial and communications applications.
FAQ
What is the maximum clock frequency supported by the SN74ABT273DB?
The SN74ABT273DB supports a maximum clock frequency of 150 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C). This rating is validated across the full industrial temperature range (–40°C to +85°C), with timing parameters including tPLH ≤ 6.5 ns and tPHL ≤ 7.3 ns ensuring reliable operation at this rate in real-world PCB environments with CL = 50 pF.
Does the SN74ABT273DB require external pull-up resistors on the CLR pin?
Yes, the SN74ABT273DB CLR pin is active-low and internally unconnected; it must be pulled high (typically to VCC via a 10-kΩ resistor) when not actively asserted to prevent unintended resets. Leaving CLR floating risks metastability and erratic Q output behavior due to noise sensitivity on this critical control line.
Can the SN74ABT273DB operate reliably at 3.3 V?
No, the SN74ABT273DB is specified only for 4.5 V to 5.5 V supply operation. Its input thresholds (VIH = 2 V, VIL = 0.8 V) and output drive characteristics are optimized for 5-V TTL/CMOS compatibility. Operation below 4.5 V violates recommended conditions and may result in undefined logic states, reduced noise margin, or failure to meet timing specifications.
What is the thermal resistance (θJA) of the SN74ABT273DB package?
The SN74ABT273DB in its 20-pin SSOP (DB) package has a junction-to-ambient thermal resistance (θJA) of 115°C/W, measured per JEDEC Std JESD51. This value assumes standard 2-layer PCB layout with 1-in² copper pour; actual thermal performance improves significantly with internal copper planes and thermal vias beneath the exposed pad area.
How does the SN74ABT273DB handle unused input pins?
Unused input pins on the SN74ABT273DB-including D inputs and CLK-must be tied to a defined logic level (VCC or GND) to prevent floating. Floating inputs increase dynamic current consumption, induce crosstalk, and risk oscillation due to internal input stage instability; TI explicitly recommends pull-up or pull-down termination per Note 3 in the datasheet.
SN74ABT273DB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
- Type:
- -
- Output Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Clock Frequency:
- -
- Max Propagation Delay @ V, Max CL:
- -
- Trigger Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Current - Quiescent (Iq):
- -
- Input Capacitance:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74ABT273DB FAQ
1.How can I place an order for SN74ABT273DB through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT273DB 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 SN74ABT273DB reliable?
The price and inventory of SN74ABT273DB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT273DB is usually 5 days.
3.What payment methods are accepted for SN74ABT273DB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT273DB transactions.
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4.How is shipping managed for SN74ABT273DB?
SN74ABT273DB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT273DB 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 SN74ABT273DB?
For technical support, including SN74ABT273DB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT273DB requirements.
6.How does Aetrix verify that SN74ABT273DB is sourced from the original manufacturer or authorized distributors?
All SN74ABT273DB 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 SN74ABT273DB meets industry standards.
7.What is the process for return or replacement of SN74ABT273DB?
All SN74ABT273DB units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT273DB, 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 SN74ABT273DB part is unused and in its original packaging.
Return procedure for SN74ABT273DB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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