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

Texas Instruments SN74ABT273PW

Name: SN74ABT273PW
Brand: Texas Instruments
SKU: SN74ABT273PW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74ABT273PW

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: 20-TSSOP (0.173", 4.40mm Width)

Datasheet:: SN74ABT273PW.pdf

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

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Product details

Overview

SN74ABT273PW from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with asynchronous clear, designed for high-speed digital logic buffering and storage in 5-V systems. It delivers 64-mA sink and –32-mA source drive strength, supports 150-MHz clock operation at 5 V, and operates across –40°C to 85°C. It is used in address latching, data register staging, and synchronous control path isolation in industrial bus interfaces.

For engineers reviewing the SN74ABT273PW datasheet, SN74ABT273PW pinout, SN74ABT273PW application, or SN74ABT273PW equivalent, key selection criteria include its TSSOP-20 package thermal performance (θ_JA = 128°C/W), guaranteed setup/hold timing (t_su = 2.5 ns, t_h = 1.2 ns), and high-drive capability enabling direct connection to multiple TTL loads without buffers.

Technical Context

The SN74ABT273PW 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 no output change when CLK is static-ensuring deterministic edge-triggered behavior unaffected by input transition rate.

Its EPIC-II^B BiCMOS process enables low power dissipation while maintaining TTL-compatible voltage thresholds (V_IH = 2 V, V_IL = 0.8 V) and robust latch-up immunity (>500 mA per JESD-17). Output ground bounce (V_OLP) remains below 1 V at 5 V and 25°C, supporting stable signal integrity in dense PCB layouts.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Function	Octal D-type flip-flop with asynchronous clear - provides 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 and CMOS systems; not rated for 3.3-V operation.
Max Clock Frequency	150 MHz at V_CC = 5 V, T_A = 25°C - supports high-throughput data staging in memory interface and bus arbitration circuits.
Output Drive	–32 mA I_OH, 64 mA I_OL - drives up to 10 standard TTL loads directly, eliminating need for external buffer stages.
Propagation Delay	t_PLH/t_PHL = 2.5–6.5 ns (CLK to Q) - ensures sub-7-ns worst-case timing margin for 100+ MHz synchronous designs.
Operating Temperature	–40°C to +85°C - qualified for industrial-grade embedded control, test equipment, and communications infrastructure.
Package	TSSOP-20 (PW), 6.95 mm × 4.4 mm × 1.2 mm - surface-mount footprint optimized for automated assembly and thermal management in space-constrained boards.

Pinout & Package

TSSOP-20 (PW) package: 0.65-mm lead pitch, 20-pin thin shrink small-outline package with exposed pad not present; JEDEC MO-153 compliant; body dimensions 6.95 mm × 4.4 mm × 1.2 mm max height.

Pin/Terminal	Circuit Role	Design Meaning
1	CLR	Asynchronous active-low clear - forces all Q outputs low independently of clock; requires pull-up for unused state.
2–9	1D–8D	Data inputs - each feeds corresponding flip-flop; must meet setup/hold timing relative to CLK edge.
10	GND	Ground reference - dedicated power return; decoupling capacitor required within 10 mm of pin.
11–18	1Q–8Q	Registered outputs - reflect D-input state after next positive CLK edge; high-drive capable.
19	V_CC	Positive supply - 4.5–5.5 V; requires local 0.1-µF ceramic bypass capacitor.
20	CLK	Global clock input - positive-edge sensitive; input threshold aligned to TTL levels (V_IL ≤ 0.8 V, V_IH ≥ 2 V).

Key Features

Feature	Design Value
High-Drive Outputs	64-mA sink / –32-mA source enables direct fanout to 10 TTL loads without level-shifting or buffering.
Low Ground Bounce	V_OLP < 1 V at 5 V/25°C - minimizes noise coupling into adjacent signals during simultaneous output switching.
Latch-Up Immunity	Exceeds 500 mA per JESD-17 - ensures robust operation under transient overvoltage or ESD stress conditions.
Edge-Triggered Timing	Rising-edge CLK sensitivity with 2.5-ns setup and 1.2-ns hold - supports reliable synchronization in high-speed control logic.
EPIC-II^B BiCMOS Process	Combines bipolar speed and CMOS low static power - achieves 150-MHz operation with sub-400-µA ICC quiescent current.

Applications

Industrial Bus Interface	Memory Address Latching
Use Scenario: Isolating and synchronizing parallel address/data lines between microcontroller and legacy peripheral ICs operating at different timing margins. IC Role / Device Role / Timing Role: Acts as an 8-bit registered buffer that captures address bits on CLK edge and holds stable during peripheral access cycles. Use Value: Eliminates timing skew between address and control signals, enabling reliable interfacing with slower peripherals like EEPROMs or LCD controllers.	Use Scenario: Capturing and holding microprocessor address bus segments during memory read/write operations. IC Role / Device Role / Timing Role: Provides edge-triggered storage for upper/lower address nibbles, releasing them only upon valid strobe assertion. Use Value: Ensures address stability throughout memory cycle duration, preventing spurious accesses caused by bus float or metastability.
Test Equipment Pattern Generation	Synchronous Control Register
Use Scenario: Generating precise, repeatable digital stimulus waveforms for functional testing of digital ASICs or FPGAs. IC Role / Device Role / Timing Role: Stores and sequences preloaded test vectors synchronized to system clock, with CLR enabling pattern reset. Use Value: Delivers deterministic, jitter-free output transitions critical for setup/hold validation and timing margin analysis.	Use Scenario: Holding configuration bits for programmable logic devices or analog front-end settings in embedded instrumentation. IC Role / Device Role / Timing Role: Serves as a clocked control register where bit states are updated only on defined system events. Use Value: Prevents partial updates or glitches during reconfiguration, ensuring atomic parameter changes in safety-critical subsystems.

Industrial Bus Interface

Memory Address Latching

Use Scenario: Isolating and synchronizing parallel address/data lines between microcontroller and legacy peripheral ICs operating at different timing margins.

IC Role / Device Role / Timing Role: Acts as an 8-bit registered buffer that captures address bits on CLK edge and holds stable during peripheral access cycles.

Use Value: Eliminates timing skew between address and control signals, enabling reliable interfacing with slower peripherals like EEPROMs or LCD controllers.

Use Scenario: Capturing and holding microprocessor address bus segments during memory read/write operations.

IC Role / Device Role / Timing Role: Provides edge-triggered storage for upper/lower address nibbles, releasing them only upon valid strobe assertion.

Use Value: Ensures address stability throughout memory cycle duration, preventing spurious accesses caused by bus float or metastability.

Test Equipment Pattern Generation

Synchronous Control Register

Use Scenario: Generating precise, repeatable digital stimulus waveforms for functional testing of digital ASICs or FPGAs.

IC Role / Device Role / Timing Role: Stores and sequences preloaded test vectors synchronized to system clock, with CLR enabling pattern reset.

Use Value: Delivers deterministic, jitter-free output transitions critical for setup/hold validation and timing margin analysis.

Use Scenario: Holding configuration bits for programmable logic devices or analog front-end settings in embedded instrumentation.

IC Role / Device Role / Timing Role: Serves as a clocked control register where bit states are updated only on defined system events.

Use Value: Prevents partial updates or glitches during reconfiguration, ensuring atomic parameter changes in safety-critical subsystems.

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
SN74ACT273PW	AC-family; lower drive (–24 mA / 24 mA); higher speed (t_P ≈ 5.5 ns); 4.5–5.5 V supply.	Lower noise immunity (V_IL = 1.5 V), less tolerant of TTL-level inputs; better for low-power, high-speed logic-only use.	Choose when minimizing propagation delay is critical and load drive requirements are ≤ 24 mA.
SN74LS273N	LS-TTL family; 5-V only; lower drive (–0.4 mA / 8 mA); slower (t_P ≈ 17 ns); higher ICC (48 mA typical).	Compatible with legacy LS-TTL systems; lacks high-drive capability and fails to meet modern fanout or speed needs.	Use only for backward compatibility in existing LS-based designs where upgrade path is constrained.

Compared with SN74ACT273PW and SN74LS273N, the SN74ABT273PW uniquely balances high drive, fast timing, and TTL input compatibility-making it optimal for bridging legacy and modern 5-V logic domains where both fanout and speed matter.

Availability

SN74ABT273PW is available at Aetrix Electronics and suitable for industrial bus interface, memory address latching, test equipment pattern generation, and synchronous control register applications requiring stable component supply and long-term industrial temperature support.

Supply support for SN74ABT273PW 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 heritage in high-reliability logic families.

The SN74ABT273PW 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 automation and test instrumentation.

FAQ

What is the maximum clock frequency supported by the SN74ABT273PW?

The SN74ABT273PW supports a maximum clock frequency of 150 MHz under recommended operating conditions (V_CC = 5 V, T_A = 25°C). At full industrial temperature range (–40°C to 85°C), timing margins remain sufficient for reliable 100+ MHz operation in well-decoupled layouts. The SN74ABT273PW datasheet specifies t_w(CLK) ≥ 3.3 ns minimum pulse width, confirming this capability.

Does the SN74ABT273PW support 3.3-V operation?

No, the SN74ABT273PW is specified only for 4.5 V to 5.5 V supply operation and is not rated for 3.3-V use. Its input thresholds (V_IL = 0.8 V, V_IH = 2 V) and output drive characteristics are optimized for 5-V TTL compatibility. Using the SN74ABT273PW with 3.3-V supplies may result in undefined logic states or degraded noise margins.

What is the purpose of the CLR pin on the SN74ABT273PW?

The CLR (clear) pin on the SN74ABT273PW is an asynchronous, active-low input that forces all eight Q outputs low regardless of clock state or D-input values. It operates independently of the clock edge and provides immediate reset functionality-critical for system initialization, error recovery, or pattern synchronization. The SN74ABT273PW requires CLR to be pulled high when not actively asserted.

Can unused inputs on the SN74ABT273PW be left floating?

No, unused inputs on the SN74ABT273PW-including D inputs and CLR-must be held high or low via resistors or direct connection. Floating inputs can cause increased ICC, erratic switching, or oscillation due to internal input stage sensitivity. The SN74ABT273PW datasheet explicitly states that unused inputs must be tied to V_CC or GND to ensure predictable operation and avoid reliability risks.

What package type does the SN74ABT273PW use, and what are its key mechanical features?

The SN74ABT273PW uses a TSSOP-20 (PW) package: 20-pin thin shrink small-outline with 0.65-mm lead pitch, body size 6.95 mm × 4.4 mm × 1.2 mm max height, and JEDEC MO-153 compliance. Its gull-wing leads enable reliable reflow soldering, and the compact footprint supports high-density PCB layouts. Thermal resistance is θ_JA = 128°C/W, requiring attention to copper pour and airflow in thermally demanding applications.

SN74ABT273PW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74ABT

Package/Case:: 20-TSSOP (0.173", 4.40mm Width)

Packaging:: Bulk

Product Status:: Active

Function:: Master Reset

Type:: D-Type

Output Type:: Non-Inverted

Number of Elements:: 1

Number of Bits per Element:: 8

Clock Frequency:: 150 MHz

Max Propagation Delay @ V, Max CL:: 6.8ns @ 5V, 50pF

Trigger Type:: Positive Edge

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

Voltage - Supply:: 4.5V ~ 5.5V

Current - Quiescent (Iq):: 400 µA

Input Capacitance:: 7 pF

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-TSSOP

SN74ABT273PW FAQ

1.How can I place an order for SN74ABT273PW through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74ABT273PW 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 SN74ABT273PW reliable?

The price and inventory of SN74ABT273PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT273PW is usually 5 days.

3.What payment methods are accepted for SN74ABT273PW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT273PW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74ABT273PW?

SN74ABT273PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74ABT273PW 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 SN74ABT273PW?

For technical support, including SN74ABT273PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT273PW requirements.

6.How does Aetrix verify that SN74ABT273PW is sourced from the original manufacturer or authorized distributors?

All SN74ABT273PW 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 SN74ABT273PW meets industry standards.

7.What is the process for return or replacement of SN74ABT273PW?

All SN74ABT273PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT273PW, 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 SN74ABT273PW part is unused and in its original packaging.

Return procedure for SN74ABT273PW:

1.Submit a request within 90 days.

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

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