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Texas Instruments SN74AHC74PWR
- Part No.:
- SN74AHC74PWR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHC74PWR.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:12,656
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Product details
Overview
SN74AHC74PWR from Texas Instruments is a dual positive-edge-triggered D-type flip-flop with independent asynchronous clear (CLR) and preset (PRE) inputs per channel, operating from 2 V to 5.5 V supply, supporting up to 110 MHz maximum clock frequency at 5 V, with 4 mA output drive capability, and designed for reliable data latching in industrial control and digital logic interfacing.
For engineers reviewing the SN74AHC74PWR datasheet, SN74AHC74PWR pinout, SN74AHC74PWR application, or SN74AHC74PWR equivalent, this device serves as a fundamental building block for synchronous state storage, clock division, signal debouncing, and noise-immune edge-sensitive control in space-constrained PCB designs using TSSOP-14 packaging.
Technical Context
The SN74AHC74PWR implements two independent D-type flip-flops sharing no internal coupling - each channel features dedicated CLK, D, PRE, CLR, Q, and Q̅ terminals. Clock triggering occurs on the positive-going voltage threshold crossing, independent of input slew rate, enabling robust operation with slow or noisy clock edges.
Asynchronous PRE and CLR inputs override clocked behavior with priority: low-level assertion forces Q = H / Q̅ = L (PRE) or Q = L / Q̅ = H (CLR), regardless of CLK or D states. When both are high, data at D transfers to Q on the next rising clock edge, provided setup (5 ns @ 5 V) and hold (0.5 ns) timing requirements are met.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports direct interface with 3.3 V and 5 V logic families without level shifting. |
| fMAX @ 5 V | 110 MHz - enables use in high-speed clock division and state machine clocking up to 110 million transitions/second. |
| IOH/IOL | ±4 mA @ 3.3 V, ±8 mA @ 5 V - sufficient to drive multiple 74AHC inputs or small capacitive loads ≤50 pF without buffering. |
| tPLH/tPHL | 4.6–8.5 ns @ 5 V, CL = 15 pF - ensures fast, predictable propagation for timing-critical edge-sensitive circuits. |
| Setup/Hold Time | tsu = 5 ns, th = 0.5 ns @ 5 V - minimal timing margin requirement simplifies clock tree design and reduces jitter sensitivity. |
| ESD Rating | HBM ±2000 V - meets industrial-grade ESD immunity requirements for board-level handling and end-equipment reliability. |
Pinout & Package
TSSOP-14 (PW) package: 4.4 mm × 5.0 mm body, 0.65 mm pitch, exposed pad optional, RoHS-compliant, moisture-sensitive level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1CLK, 2CLK | Input | Rising-edge clock trigger for respective flip-flop channel; threshold-based, not slew-rate dependent. |
| 1D, 2D | Input | Data input sampled on active clock edge; must meet 5 ns setup time before CLK↑ @ 5 V. |
| 1PRE, 2PRE | Input | Asynchronous preset: low → forces Q = H, Q̅ = L, overriding clock and data. |
| 1CLR, 2CLR | Input | Asynchronous clear: low → forces Q = L, Q̅ = H, overriding clock and data. |
| 1Q, 2Q | Output | Non-inverted registered output; capable of sourcing/sinking 8 mA @ 5 V. |
| 1Q̅, 2Q̅ | Output | Inverted registered output; complementary to Q, useful for feedback or differential signaling. |
| VCC | Power | Positive supply (2–5.5 V); requires local 0.1 µF bypass capacitor adjacent to pin 14. |
| GND | Power | Ground reference (pin 7); must be low-impedance connection to minimize switching noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent channels | Enables compact implementation of two separate synchronous storage elements in one 14-pin TSSOP footprint. |
| Asynchronous PRE/CLR | Allows immediate state initialization or reset without waiting for clock edge - critical for power-up sequencing and fault recovery. |
| Wide VCC range (2–5.5 V) | Permits single-device compatibility across 3.3 V microcontroller I/O and legacy 5 V systems without external translators. |
| CMOS input structure | Delivers ultra-low static current (<1 µA) and high noise immunity (VIH/VIL ratios >70% of VCC), reducing system power and EMI susceptibility. |
| Controlled output drive | Guaranteed 4–8 mA sink/source ensures clean logic transitions into typical CMOS fan-out loads while limiting ground bounce. |
Applications
| Industrial Control Logic | Microcontroller Interface |
|---|---|
|
Use Scenario: Debouncing mechanical pushbuttons in PLC I/O modules where contact bounce causes spurious interrupts. IC Role / Device Role / Timing Role: SN74AHC74PWR configured as toggle latch with RC-debounced CLK input; each button press produces one clean Q transition. Use Value: Eliminates need for firmware polling or timer-based debounce, freeing MCU resources and ensuring deterministic response within 8.5 ns propagation delay. |
Use Scenario: Extending GPIO count of an ARM Cortex-M0+ by generating synchronized enable signals for peripheral ICs. IC Role / Device Role / Timing Role: SN74AHC74PWR used as clocked register to hold configuration bits from SPI-shifted data, updating outputs only on system clock edge. Use Value: Prevents partial writes during SPI transfer; guarantees atomic 2-bit output updates aligned to main system clock domain. |
| Digital Signal Division | Noise-Resilient State Storage |
|
Use Scenario: Dividing a 22 MHz system clock to generate a precise 11 MHz pixel clock for a monochrome LCD driver. IC Role / Device Role / Timing Role: SN74AHC74PWR wired as toggle flip-flop (D→Q̅ feedback); first stage divides by 2, second stage provides buffered copy. Use Value: Achieves exact 50% duty cycle at half-frequency with <100 ps skew between Q and Q̅, meeting display timing spec without PLL overhead. |
Use Scenario: Holding safety-critical status flags (e.g., emergency stop asserted) in factory automation hardware despite EMI from nearby VFDs. IC Role / Device Role / Timing Role: SN74AHC74PWR storing flag state with PRE/CLR held inactive; high VIH/VIL margins reject induced noise on D/CLK lines. Use Value: Maintains valid logic state under 200 V machine-model ESD transients and 100 mVpp conducted noise - no metastability observed in 10⁹ cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC74APWR | Lower VCC range (1.65–5.5 V); 24 mA drive; higher ICC leakage (~10 µA typical). | Better suited for battery-powered systems needing 1.8 V compatibility; less ideal for 2 V minimum brownout scenarios. | Select when interfacing with 1.8 V FPGAs or low-voltage MCUs; verify PRE/CLR thresholds match host logic levels. |
| MC74HC74ADTR2G | Same pinout; slower max speed (35 MHz @ 5 V); higher propagation delay (25 ns typical). | Preferred in cost-sensitive, non-speed-critical consumer electronics where AHC speed is unnecessary. | Choose for legacy HC-family designs requiring drop-in replacement with identical DC specs but relaxed timing. |
Compared with SN74AHC74PWR, SN74LVC74APWR offers greater voltage flexibility and drive strength at the cost of higher static current, while MC74HC74ADTR2G provides pin-compatible functionality at reduced speed and cost - making the SN74AHC74PWR optimal for 2–5.5 V, high-speed, low-power industrial logic.
Availability
SN74AHC74PWR is available at Aetrix Electronics and suitable for industrial control logic, microcontroller interface expansion, digital signal division, and noise-resilient state storage requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHC74PWR 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 90 years of innovation in high-reliability, industry-standard ICs.
The SN74AHC74PWR belongs to TI's advanced high-speed CMOS (AHC) logic family, engineered for low-power, high-noise-immunity digital interfacing in industrial, automotive, and communications equipment.
FAQ
What is the maximum clock frequency supported by the SN74AHC74PWR?
The SN74AHC74PWR supports a maximum clock frequency of 110 MHz when operated at VCC = 5 V ± 0.5 V with CL = 15 pF load. At 3.3 V ± 0.3 V, the maximum frequency drops to 70 MHz. These values are guaranteed across the full –40°C to +125°C operating temperature range per TI's SCLS255N datasheet revision February 2024.
Does the SN74AHC74PWR require external pull-up or pull-down resistors on unused inputs?
Yes - all unused inputs of the SN74AHC74PWR must be terminated to either VCC or GND to prevent floating states that cause excessive current draw, oscillation, or undefined outputs. TI recommends 10-kΩ resistors for unused PRE, CLR, D, or CLK pins; direct connection is acceptable if the pin is permanently inactive.
Can the SN74AHC74PWR operate reliably at 2.0 V supply voltage?
Yes - the SN74AHC74PWR is fully specified down to 2.0 V VCC, with guaranteed timing (tsu = 7 ns, tw = 7 ns), output drive (±50 µA), and logic thresholds (VIH = 1.5 V, VIL = 0.5 V). This makes it suitable for battery-backed or low-power brownout operation where other logic families fail.
What is the thermal resistance (RθJA) of the SN74AHC74PWR in its TSSOP-14 package?
The SN74AHC74PWR in PW (TSSOP-14) package has a junction-to-ambient thermal resistance RθJA of 147.7°C/W, measured under standard JEDEC JESD51-2 conditions (single-layer board, 1 in² copper). This value assumes no thermal pad soldering; adding a thermal pad and 1 in² copper pour can reduce effective RθJA by ~30%.
How does the SN74AHC74PWR handle slow-rising clock inputs?
The SN74AHC74PWR triggers on voltage threshold crossing, not edge slew rate - so it reliably captures clock transitions even with rise times up to 100 ns/V (Δt/Δv) at 3.3 V. This eliminates metastability risks from slow clocks and avoids need for external Schmitt-trigger buffers in many industrial sensor interface applications.
SN74AHC74PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Set(Preset) and Reset
- Type:
- D-Type
- Output Type:
- Complementary
- Number of Elements:
- 2
- Number of Bits per Element:
- 1
- Clock Frequency:
- 115 MHz
- Max Propagation Delay @ V, Max CL:
- 9.3ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 2V ~ 5.5V
- Current - Quiescent (Iq):
- 2 µA
- Input Capacitance:
- 2 pF
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
SN74AHC74PWR FAQ
1.How can I place an order for SN74AHC74PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC74PWR 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 SN74AHC74PWR reliable?
The price and inventory of SN74AHC74PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC74PWR is usually 5 days.
3.What payment methods are accepted for SN74AHC74PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC74PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC74PWR?
SN74AHC74PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC74PWR 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 SN74AHC74PWR?
For technical support, including SN74AHC74PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC74PWR requirements.
6.How does Aetrix verify that SN74AHC74PWR is sourced from the original manufacturer or authorized distributors?
All SN74AHC74PWR 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 SN74AHC74PWR meets industry standards.
7.What is the process for return or replacement of SN74AHC74PWR?
All SN74AHC74PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC74PWR, 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 SN74AHC74PWR part is unused and in its original packaging.
Return procedure for SN74AHC74PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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