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Texas Instruments CD74ACT273M
- Part No.:
- CD74ACT273M
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74ACT273M.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,910
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Product details
Overview
CD74ACT273M from Texas Instruments is an octal D-type flip-flop with asynchronous master reset, implemented in advanced CMOS technology. It features 8-bit edge-triggered storage, ±24mA output drive, 6.5ns typical propagation delay at 5V/25°C, and operates across -55°C to +125°C. It serves as a synchronous data latch in digital control logic, bus interface buffering, and state register applications.
For engineers reviewing the CD74ACT273M datasheet, CD74ACT273M pinout, CD74ACT273M application, or CD74ACT273M equivalent, key selection criteria include its 5V-only ACT logic family compatibility, common clock/reset architecture, SOIC-20 package footprint, and guaranteed operation over extended industrial/military temperature range.
Technical Context
The CD74ACT273M implements eight independent D flip-flops sharing a single rising-edge-triggered clock (CP) and active-low asynchronous master reset (!MR). All outputs update synchronously on the positive-going CP edge, while !MR forces Qn = L independently of clock timing.
It belongs to the ACT logic family, requiring 4.5V–5.5V supply, delivering TTL-compatible input thresholds (VIH ≥ 2.0V, VIL ≤ 0.8V), and supporting fanout to 15 FAST™ ICs or direct 50Ω transmission line driving - enabling robust signal integrity in high-speed digital systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ACT (Advanced CMOS TTL-compatible), ensuring interoperability with legacy 5V TTL systems without level translation. |
| Supply Voltage Range | 4.5V to 5.5V - mandates stable 5V rail; not compatible with 3.3V or mixed-voltage domains. |
| Propagation Delay (CP→Q) | 3.5ns (min) to 13.5ns (max) at 5V/125°C - supports >85MHz clock operation in worst-case thermal conditions. |
| Output Drive | ±24mA per pin - sufficient to drive 50Ω transmission lines or sink/source 15 FAST™ loads directly. |
| Operating Temperature | -55°C to +125°C - qualified for aerospace, defense, and under-hood automotive applications. |
| Input Capacitance | 10pF - low loading enables high-fanout clock distribution without excessive signal degradation. |
| Quiescent Current | 8μA typical (25°C), ≤160μA max (-55°C to 125°C) - ultra-low static power for always-on control registers. |
Pinout & Package
CD74ACT273M is supplied in a 20-pin SOIC (DW) package measuring 12.8mm × 10.3mm (body: 12.8mm × 7.5mm), RoHS-compliant with NIPDAU lead finish and Level-1 moisture sensitivity rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 !MR | Asynchronous Master Reset (active-low) | Forces all Q outputs low regardless of clock state; requires clean, debounced low pulse ≥4.4ns wide. |
| 2 Q0 – 9 Q3, 12 Q4 – 19 Q7 | Eight buffered complementary outputs | Qn reflects Dn sampled on prior CP rising edge; outputs drive loads directly without external buffers. |
| 3 D0 – 4 D1, 7 D2 – 8 D3, 13 D4 – 14 D5, 17 D6 – 18 D7 | Eight data inputs | Sampled on CP rising edge; inputs tolerate 0V–VCC voltage range and exhibit 10pF capacitance. |
| 10 GND | Ground reference | Primary return path for all I/O and supply currents; must be low-impedance and decoupled locally. |
| 11 CP | Clock input (rising-edge triggered) | Edge-sensitive control; requires <10ns input slew rate (4.5V–5.5V) and ≥5.3ns minimum pulse width. |
| 20 VCC | Positive supply | 5V nominal; requires 0.1µF ceramic bypass capacitor placed adjacent to pin to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| SCR-latchup-resistant process | Guarantees immunity to destructive latch-up under transient overvoltage or ESD stress per JEDEC JESD78. |
| Balanced propagation delays | Minimizes skew between parallel Q outputs (<1ns variation), critical for synchronous bus capture timing. |
| ±24mA output drive | Enables direct termination of 50Ω PCB traces - eliminates need for external line drivers in high-speed interconnects. |
| 1.5ns input rise/fall time support | Validated for fast-edge signals up to 10ns slew rate (4.5V–5.5V), preserving timing margins in dense logic layouts. |
| ESD tolerance | ±2000V HBM - exceeds standard industrial requirements, reducing susceptibility to handling damage. |
Applications
| Industrial PLC I/O Expansion | Aerospace Avionics Data Capture |
|---|---|
|
Use Scenario: Capturing sensor status bits from analog-to-digital converters in real-time control loops. IC Role / Device Role / Timing Role: Synchronizing 8-bit parallel ADC output into a deterministic clock domain before CPU readback. Use Value: Guaranteed setup/hold times (2ns) and sub-14ns propagation delay ensure reliable sampling at >70MHz system clocks. |
Use Scenario: Holding configuration data for flight-critical subsystems during power-up sequencing. IC Role / Device Role / Timing Role: Acting as a nonvolatile shadow register bank, retaining state across brown-out events via !MR control. Use Value: Extended -55°C to +125°C operation and SCR-latchup resistance meet DO-160E environmental compliance. |
| Automotive Engine Control Unit | Test Equipment Pattern Generator |
|
Use Scenario: Buffering diagnostic command bits sent from microcontroller to solenoid driver arrays. IC Role / Device Role / Timing Role: Isolating MCU GPIOs from high-current load transients using robust ±24mA outputs. Use Value: Direct 50Ω line drive capability eliminates external buffers, reducing BOM count and board area in space-constrained ECUs. |
Use Scenario: Generating precise multi-bit stimulus waveforms for IC functional validation. IC Role / Device Role / Timing Role: Constructing synchronized 8-bit parallel test vectors clocked by precision function generator. Use Value: Low 10pF input capacitance minimizes clock loading, preserving edge fidelity across multiple cascaded stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D flip-flop with reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT273N | Same ACT logic family, identical electrical specs, but in PDIP-20 package (24.33mm × 9.4mm). | Larger footprint and through-hole mounting; unsuitable for surface-mount production or high-density layouts. | Select when hand-soldering, prototyping, or legacy board compatibility requires DIP form factor. |
| CD74AC273M | AC-family variant: wider 1.5V–5.5V supply range, slower 12.3ns max propagation delay at 5V, lower drive (±24mA same). | Supports mixed-voltage systems (e.g., 3.3V logic interfacing), but lacks guaranteed 5V-only noise immunity of ACT version. | Choose for flexible supply rails or cost-sensitive industrial designs where speed <85MHz suffices. |
Compared with SN74ACT273N, CD74ACT273M offers superior board-space efficiency and reflow compatibility; versus CD74AC273M, it delivers tighter timing control and enhanced noise margin in fixed 5V environments - making it optimal for high-reliability, high-speed synchronous latching.
Availability
CD74ACT273M is available at Aetrix Electronics and suitable for industrial automation, aerospace avionics, and automotive engine control applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CD74ACT273M 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 military and industrial logic families.
CD74ACT273M belongs to TI's CD74ACT series - engineered for demanding applications requiring TTL-compatible speed, extended temperature resilience, and latch-up immunity in mission-critical digital systems.
FAQ
What is the recommended supply voltage range for CD74ACT273M?
The CD74ACT273M requires a supply voltage between 4.5V and 5.5V. Operation outside this range is not specified and may result in incorrect logic behavior or device damage. The part is not rated for 3.3V operation - use CD74AC273M instead if dual-voltage support is needed. Always decouple VCC with a 0.1µF ceramic capacitor placed within 2mm of the pin.
Does CD74ACT273M support hot insertion or live insertion into a powered backplane?
No, CD74ACT273M does not support hot insertion. Its absolute maximum ratings specify no current injection during power-up sequencing, and the device lacks bus-hold or Ioff protection. Applying signals to inputs or outputs before VCC reaches 4.5V risks violating IIK limits (±20mA) and may cause latch-up. Power sequencing must follow VCC-first, then signal application.
Can CD74ACT273M drive a 50Ω transmission line directly without external termination?
Yes, CD74ACT273M is explicitly characterized to drive 50Ω transmission lines - verified at 85°C with 75mA sink/source capability per output. At 5V supply, it delivers ≥3.7V VOH at -24mA and ≤0.5V VOL at +24mA, meeting required line-driving voltage margins. No series resistor or external driver is needed for point-to-point 50Ω traces up to 15cm.
What is the minimum pulse width required on the !MR pin to ensure reliable reset of CD74ACT273M?
The minimum !MR pulse width is 4.4ns at 5V and 25°C, increasing to 5ns at -55°C to +125°C per datasheet Section 4.6. To ensure robust operation across temperature and voltage extremes, design for ≥6ns low pulse width with monotonic edges. Glitches shorter than specification will not guarantee full reset of all eight flip-flops.
Is CD74ACT273M pin-compatible with CD74AC273M?
Yes, CD74ACT273M and CD74AC273M share identical pinout, package (SOIC-20 DW), and functional block diagram. However, they differ electrically: CD74ACT273M requires 4.5V–5.5V only and offers faster timing, while CD74AC273M supports 1.5V–5.5V but has looser AC specs. Swapping requires verifying supply rail compatibility and timing margins in the target design.
CD74ACT273M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 85 MHz
- Max Propagation Delay @ V, Max CL:
- 13.5ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 10 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
CD74ACT273M FAQ
1.How can I place an order for CD74ACT273M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74ACT273M 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 CD74ACT273M reliable?
The price and inventory of CD74ACT273M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74ACT273M is usually 5 days.
3.What payment methods are accepted for CD74ACT273M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74ACT273M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74ACT273M?
CD74ACT273M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74ACT273M 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 CD74ACT273M?
For technical support, including CD74ACT273M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74ACT273M requirements.
6.How does Aetrix verify that CD74ACT273M is sourced from the original manufacturer or authorized distributors?
All CD74ACT273M 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 CD74ACT273M meets industry standards.
7.What is the process for return or replacement of CD74ACT273M?
All CD74ACT273M units undergo pre-shipment inspection (PSI). If there is an issue with CD74ACT273M, 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 CD74ACT273M part is unused and in its original packaging.
Return procedure for CD74ACT273M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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