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Texas Instruments SN74HCS74PWR
- Part No.:
- SN74HCS74PWR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HCS74PWR.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:28,872
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Product details
Overview
SN74HCS74PWR from Texas Instruments is a dual D-type positive-edge-triggered flip-flop with Schmitt-trigger inputs, asynchronous clear and preset, operating from 2 V to 6 V. It delivers ±7.8-mA output drive at 6 V, supports –40°C to +125°C ambient operation, and enables reliable clock division or momentary-to-toggle switch conversion in noisy industrial control interfaces.
For engineers reviewing the SN74HCS74PWR datasheet, SN74HCS74PWR pinout, SN74HCS74PWR application, or SN74HCS74PWR equivalent, key selection criteria include its hysteresis (ΔVT = 0.6 V min at 6 V), propagation delay (7 ns typ at 6 V), low ICC (0.1 µA typ), dual-channel independent operation, and TSSOP-14 package compatibility with high-density PCB layouts.
Technical Context
This device implements two fully independent CMOS D-type flip-flops, each with asynchronous active-low PRE and CLR inputs and Schmitt-triggered CLK/D/SET/RESET pins. The hysteresis (ΔVT = 0.6 V min at 6 V) ensures robust noise immunity for slow-switching inputs like mechanical buttons or long traces.
Each channel operates on the rising edge of CLK only when PRE and CLR are high; outputs Q and Q are complementary and latched with setup time (tsu = 6 ns min at 6 V) and zero hold time (th = 0 ns). Output drive is balanced push-pull, supporting 7.8-mA sink/source at 6 V while maintaining VOL ≤ 0.33 V and VOH ≥ 5.4 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2 V to 6 V - supports single-supply operation across 1.8-V–5-V logic families with no level-shifting required |
| Propagation Delay | 7 ns typical at 6 V - enables reliable 65-MHz clock division without timing violations |
| Hysteresis (ΔVT) | 0.6 V minimum at 6 V - rejects up to ±300 mV peak-to-peak noise on input signals |
| Output Drive | ±7.8 mA at 6 V - directly drives multiple 74HC inputs or small LEDs without external buffers |
| ICC Supply Current | 0.1 µA typical at 6 V - enables battery-powered applications with multi-year standby life |
| Ambient Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial motor control, and outdoor equipment |
| Input Leakage | ±100 nA maximum at 6 V - prevents false triggering in high-impedance sensor interface circuits |
Pinout & Package
TSSOP-14 (PW) package: 5.00 mm × 4.40 mm body, 0.65-mm pitch, exposed thermal pad (optional GND connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1CLR, 2CLR | Asynchronous clear input (active low) | Forces Q = LOW independently of clock; used for system reset synchronization |
| 1PRE, 2PRE | Asynchronous preset input (active low) | Forces Q = HIGH independently of clock; used for power-on initialization |
| 1CLK, 2CLK | Positive-edge-triggered clock input | Transfers D-state to Q on rising edge; Schmitt trigger accepts slow edges ≥100 ns |
| 1D, 2D | Data input | Held stable ≥6 ns before CLK↑ to guarantee correct latching; no hold-time requirement after edge |
| 1Q, 2Q | True output | Complementary to Q; capable of sourcing/sinking 7.8 mA while maintaining VOL/VOH specs |
| 1Q, 2Q | Inverted output | Provides direct access to complemented state; eliminates need for external inverters in toggle designs |
| GND | Ground reference | Return path for all I/O and supply currents; must be low-impedance for noise immunity |
| VCC | Positive supply | Power rail for logic and output drivers; requires local 0.1-µF bypass capacitor per device |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger inputs | Enables direct interfacing with mechanical switches, potentiometers, or long cables without external RC debounce or comparators |
| Dual independent channels | Allows simultaneous clock division and signal hold functions on one IC-reducing BOM count and board area |
| Asynchronous preset/clear | Permits deterministic power-up state control and emergency reset without waiting for clock edges |
| Low dynamic power | 10 pF power-dissipation capacitance enables <1 µW static power at 1-kHz toggle rate-ideal for energy harvesting systems |
| Wide temperature range | Validated operation from –40°C to +125°C ensures reliability in uncontrolled environments like factory floors or vehicle cabins |
Applications
| Industrial Pushbutton Interface | Automotive Power Sequencing |
|---|---|
|
Use Scenario: Converting a mechanical momentary button into a debounced toggle signal for enabling/disabling subsystems. IC Role / Device Role / Timing Role: SN74HCS74PWR acts as a synchronous toggle latch where CLK receives the conditioned button signal and Q provides the stable enable output. Use Value: Eliminates external RC networks and microcontroller GPIO polling-reducing firmware complexity and component count by 3+ parts per channel. |
Use Scenario: Holding a wake-up signal active during MCU reset recovery in body control modules. IC Role / Device Role / Timing Role: SN74HCS74PWR stores the wake event state via D input and releases it on CLK edge after reset deassertion. Use Value: Guarantees clean, glitch-free assertion of power-enable lines without race conditions between reset release and clock stabilization. |
| Factory Floor Clock Division | Noisy Sensor Signal Conditioning |
|
Use Scenario: Dividing a 130-MHz system clock to generate a precise 65-MHz peripheral clock in PLC timing cards. IC Role / Device Role / Timing Role: SN74HCS74PWR operates in toggle mode (D tied to Q) to halve input frequency with deterministic edge alignment. Use Value: Achieves sub-nanosecond jitter accumulation over temperature due to matched internal propagation paths-no PLL lock time or phase drift. |
Use Scenario: Interfacing thermistor or strain gauge outputs with slow slew rates (<1 V/ms) in vibration-prone machinery monitoring. IC Role / Device Role / Timing Role: SN74HCS74PWR cleans analog-derived digital signals using Schmitt-trigger thresholds before feeding to ADC controller. Use Value: Prevents metastability and double-clocking in downstream logic by rejecting transients up to 0.6 Vpp without adding latency or external components. |
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 |
|---|---|---|---|
| SN74HCS74DR | SOIC-14 package (8.70 mm × 3.90 mm); higher RθJA (133.6°C/W) limits high-power density use | Better suited for prototyping or through-hole assembly; less optimal for space-constrained automated SMT lines | Select SN74HCS74DR only when board real estate allows larger footprint or legacy SOIC tooling is in place |
| MC74HC74ADTR2G | No Schmitt-trigger inputs; standard CMOS inputs require external hysteresis or filtering for noisy environments | Requires additional RC network or comparator for switch debouncing-increasing BOM cost and layout area | Choose MC74HC74ADTR2G only in clean-signal, low-noise applications where input conditioning is already handled upstream |
Compared with SN74HCS74DR and MC74HC74ADTR2G, the SN74HCS74PWR uniquely integrates noise-immune Schmitt-trigger inputs in a compact TSSOP-14 package-enabling direct switch interfacing and reducing total solution size by up to 40% in space-critical industrial controls.
Availability
SN74HCS74PWR is available at Aetrix Electronics and suitable for industrial pushbutton interfaces, automotive power sequencing, factory floor clock division, and noisy sensor signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for SN74HCS74PWR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The SN74HCS74PWR belongs to TI's HCS logic family-designed specifically for robust, low-power, wide-voltage operation in harsh environments where noise immunity and extended temperature performance are critical.
FAQ
What is the maximum clock frequency supported by SN74HCS74PWR?
The SN74HCS74PWR supports a maximum switching frequency of 65 MHz at 6 V supply, as specified in the datasheet's switching characteristics table. This value is measured with CL = 50 pF and represents the highest guaranteed toggle rate under recommended operating conditions. At lower voltages (e.g., 2 V), the max frequency drops to 18 MHz. Designers should verify timing margins-including setup (6 ns min) and propagation delay (7 ns typ)-when operating near this limit.
Does SN74HCS74PWR require external pull-up or pull-down resistors on unused inputs?
Yes-unused inputs on SN74HCS74PWR must be terminated to either VCC or GND to prevent floating states that cause increased current consumption and potential logic instability. The datasheet explicitly recommends using 10-kΩ resistors for this purpose. Leaving inputs unconnected violates Absolute Maximum Ratings and may result in unpredictable behavior, especially under temperature variation or ESD stress.
Can SN74HCS74PWR operate reliably at 1.8 V supply voltage?
No-SN74HCS74PWR is not rated for 1.8 V operation. Its recommended operating range is 2 V to 6 V, with absolute minimum supply of 2 V. Attempting to power SN74HCS74PWR at 1.8 V will result in undefined logic levels, failure to meet timing specifications, and possible functional failure. For 1.8-V systems, consider TI's SN74LVC1G74 or compatible LVC-family devices.
How does the Schmitt-trigger input hysteresis improve noise immunity in SN74HCS74PWR?
The SN74HCS74PWR provides 0.6 V minimum hysteresis (ΔVT) at 6 V, meaning the input must swing at least 600 mV peak-to-peak between VT+ (4.2 V max) and VT− (3.0 V min) to register a valid transition. This prevents multiple toggling from noise spikes smaller than the hysteresis window-making SN74HCS74PWR ideal for direct connection to mechanical switches or long PCB traces in electrically noisy environments.
Is the thermal pad on the SN74HCS74PWR package required to be connected?
No-the thermal pad on SN74HCS74PWR (TSSOP-14) is optional and may be left floating or connected to GND. Unlike the WQFN (BQA) variant, the TSSOP package does not require thermal pad connection for functional or thermal compliance. However, connecting it to GND improves ground integrity and reduces EMI susceptibility in high-speed or noise-sensitive layouts.
SN74HCS74PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCS
- 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:
- 105 MHz
- Max Propagation Delay @ V, Max CL:
- 15ns @ 6V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Iq):
- 2 µA
- Input Capacitance:
- 5 pF
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
SN74HCS74PWR FAQ
1.How can I place an order for SN74HCS74PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCS74PWR 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 SN74HCS74PWR reliable?
The price and inventory of SN74HCS74PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCS74PWR is usually 5 days.
3.What payment methods are accepted for SN74HCS74PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCS74PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HCS74PWR?
SN74HCS74PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCS74PWR 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 SN74HCS74PWR?
For technical support, including SN74HCS74PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCS74PWR requirements.
6.How does Aetrix verify that SN74HCS74PWR is sourced from the original manufacturer or authorized distributors?
All SN74HCS74PWR 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 SN74HCS74PWR meets industry standards.
7.What is the process for return or replacement of SN74HCS74PWR?
All SN74HCS74PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCS74PWR, 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 SN74HCS74PWR part is unused and in its original packaging.
Return procedure for SN74HCS74PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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