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Texas Instruments SN74HCS273RKSR
- Part No.:
- SN74HCS273RKSR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
SN74HCS273RKSR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,750
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Product details
Overview
SN74HCS273RKSR from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with Schmitt-trigger inputs, shared asynchronous active-low clear (CLR), and shared clock (CLK) input. It operates from 2 V to 6 V, delivers ±7.8-mA output drive at 6 V, supports –40°C to +125°C ambient temperature, and provides 135-MHz max clock frequency at 6 V. It is used for synchronizing 8-bit parallel data streams in industrial control interfaces.
For engineers reviewing the SN74HCS273RKSR datasheet, SN74HCS273RKSR pinout, SN74HCS273RKSR application, or SN74HCS273RKSR equivalent, key selection criteria include Schmitt-trigger noise immunity, low ICC (100 nA typical), 20-pin VQFN (RKS) package thermal performance, and compatibility with 50-pF load timing specifications.
Technical Context
The SN74HCS273RKSR implements eight independent D-type latches sharing a single rising-edge-triggered CLK and a common active-low asynchronous CLR. Its Schmitt-trigger inputs provide hysteresis (ΔVT = 0.6–1.6 V) to reject slow-rising or noisy signals without external conditioning.
All outputs feature balanced CMOS push-pull drivers capable of sourcing/sinking up to ±7.8 mA at 6 V, with propagation delay tpd = 12.1–14.3 ns and transition time tt = 7.4–10.4 ns under CL = 50 pF conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2 V to 6 V - enables direct interface with 3.3-V and 5-V logic systems without level shifters |
| Max Clock Frequency | 135 MHz at 6 V - supports high-speed data capture in real-time control loops |
| Output Drive | ±7.8 mA at 6 V - drives multiple standard CMOS loads or moderate capacitive traces without buffering |
| Input Hysteresis (ΔVT) | 0.6–1.6 V - rejects noise spikes up to ±0.8 V peak-to-peak on data or clock lines |
| Supply Current (ICC) | 100 nA typical - enables ultra-low-power operation in battery-backed or energy-harvesting systems |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, motor drive, and industrial PLC environments |
| Input Leakage | ±100 nA - ensures stable logic states with high-impedance pull-up/down resistors (e.g., 10 kΩ) |
Pinout & Package
RKS package is a 20-pin VQFN (4.50 mm × 2.50 mm) with exposed thermal pad. Pin 1 marked via top-side dot; thermal pad recommended connected to GND for improved thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CLR) | Asynchronous Clear Input | Active-low global reset - forces all Q outputs LOW regardless of CLK state; critical for system initialization |
| 3, 4, 7, 8, 13, 14, 17, 18 (D1–D8) | Data Inputs | Eight independent D inputs - each samples its value on CLK rising edge; Schmitt-triggered for noise margin |
| 2, 5, 6, 9, 12, 15, 16, 19 (Q1–Q8) | Registered Outputs | Eight synchronized Q outputs - retain state until next CLK edge or CLR assertion |
| 11 (CLK) | Clock Input | Rising-edge-triggered master clock - all eight flip-flops update simultaneously; no internal clock skew |
| 10 (GND), 20 (VCC) | Power Terminals | Dual power pins - reduce supply impedance; require local 0.1-μF bypass capacitor per datasheet layout guidelines |
| Thermal Pad | Thermal Interface | Exposed copper pad - improves θJA by ~25% vs. TSSOP; must be soldered to GND plane for rated thermal performance |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger inputs | Enables reliable operation with slow-rising signals (e.g., mechanical switch debouncing or long PCB traces) without external RC filters |
| Ultra-low ICC (100 nA) | Reduces standby power in always-on monitoring circuits - e.g., sensor hub wake-up logic consuming <1 μW total |
| ±7.8-mA output drive | Drives 10+ standard CMOS inputs or 50-pF bus capacitance while maintaining VOL < 0.33 V and VOH > 5.4 V at 6 V |
| Extended temperature range | Validated operation from –40°C to +125°C - eliminates derating calculations for industrial motor control gate drivers |
| VQFN (RKS) thermal pad | Lowers junction-to-board thermal resistance to 57.4°C/W - sustains full output drive at TA = 125°C without thermal throttling |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
|
Use Scenario: Latching 8-bit sensor status (e.g., door open/closed, seatbelt fastened) before CAN message framing. IC Role / Device Role / Timing Role: Synchronizes asynchronous mechanical switch inputs to the microcontroller's system clock domain using shared CLK and CLR. Use Value: Schmitt-trigger inputs eliminate need for external debounce circuitry; 125°C rating ensures reliability near engine bay electronics. |
Use Scenario: Capturing diagnostic LED enable signals from MCU GPIOs for fault-indicating dashboard lighting. IC Role / Device Role / Timing Role: Buffers and registers 8-channel LED control bits with simultaneous update on CLK edge to prevent partial illumination states. Use Value: ±7.8-mA drive directly powers LEDs without external transistors; low ICC extends battery life during sleep mode. |
| Factory Automation Sensor Hub | Medical Infusion Pump Controller |
|
Use Scenario: Sampling 8-channel analog-to-digital converter (ADC) output bus synchronized to a central timing controller. IC Role / Device Role / Timing Role: Acts as a clock-domain crossing register - transfers ADC result bits into the MCU's processing clock domain on rising CLK edge. Use Value: 135-MHz max clock supports sampling rates up to 135 MSPS per channel; 50-pF load compliance ensures signal integrity on dense PCBs. |
Use Scenario: Holding safety-critical actuator enable signals (e.g., motor start/stop, valve open/close) during MCU firmware updates. IC Role / Device Role / Timing Role: Provides non-volatile hold function via asynchronous CLR - maintains last-safe state even if MCU resets or loses clock. Use Value: Asynchronous clear guarantees fail-safe behavior; 125°C rating accommodates sealed enclosure thermal buildup during continuous operation. |
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 |
|---|---|---|---|
| SN74HCS374RKR | Has tri-state outputs (OE control); lacks Schmitt-trigger inputs; same RKS package and voltage range | Used where bus-sharing or multiplexed data paths require output disable; unsuitable for noisy sensor inputs | Select SN74HCS374RKR only when tri-state capability is required and input noise immunity is handled externally |
| 74LVC273PW,118 | 3.3-V only (1.65–3.6 V); no Schmitt-trigger inputs; TSSOP-20 package; higher ICC (10 µA typical) | Targeted for low-voltage digital logic families; requires clean, fast-rising clocks; not rated beyond 125°C | Choose 74LVC273PW,118 for cost-sensitive 3.3-V-only systems with controlled signal integrity and ambient <85°C |
Compared with SN74HCS273RKSR, SN74HCS374RKR adds output control but removes noise immunity, while 74LVC273PW,118 reduces voltage flexibility and thermal robustness - making SN74HCS273RKSR uniquely suited for wide-supply, high-noise, high-temperature embedded synchronization.
Availability
SN74HCS273RKSR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, and medical infusion pump controllers requiring stable component supply across extended temperature and voltage ranges.
Supply support for SN74HCS273RKSR 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 50 years of innovation in high-reliability IC design.
The SN74HCS273RKSR belongs to TI's HCS logic family, engineered for ultra-low-power, noise-immune digital interfacing in harsh environments - particularly targeting industrial automation, automotive subsystems, and safety-critical control applications.
FAQ
What is the maximum clock frequency supported by the SN74HCS273RKSR?
The SN74HCS273RKSR supports a maximum clock frequency of 135 MHz at VCC = 6 V, 120 MHz at 4.5 V, and 49 MHz at 2 V. These values are measured under CL = 50 pF load conditions and define the upper limit for reliable synchronous data capture in designs using the SN74HCS273RKSR.
Does the SN74HCS273RKSR require external pull-up or pull-down resistors on unused inputs?
Unused inputs on the SN74HCS273RKSR must be terminated to either VCC or GND to prevent floating states. While Schmitt-trigger inputs tolerate slow transitions, unconnected pins risk undefined logic levels and increased dynamic current. A 10-kΩ resistor is commonly used, and the SN74HCS273RKSR datasheet explicitly recommends this practice for stability.
Can the SN74HCS273RKSR drive a 100-pF capacitive load reliably?
The SN74HCS273RKSR is characterized and guaranteed for CL ≤ 50 pF per output. Driving 100-pF loads may degrade timing margins - increasing propagation delay, reducing noise margin, and potentially violating setup/hold windows. For such cases, buffer stages or lower-capacitance routing should be used alongside the SN74HCS273RKSR.
How does the thermal pad on the SN74HCS273RKSR package affect thermal performance?
The exposed thermal pad on the SN74HCS273RKSR (RKS package) lowers junction-to-board thermal resistance to 57.4°C/W when soldered to a GND plane. Leaving it unconnected increases θJB by ~30%, risking thermal saturation at high ambient temperatures or sustained output loading - directly impacting long-term reliability of the SN74HCS273RKSR.
Is the SN74HCS273RKSR pin-compatible with other 20-pin octal flip-flops like the SN74HC273?
No - the SN74HCS273RKSR shares identical pinout with SN74HC273 in TSSOP/VSSOP packages, but the RKS (VQFN) variant has different pad layout and thermal pad placement. While electrical functionality matches, PCB footprint is not interchangeable; SN74HCS273RKSR requires its specific RKS land pattern defined in TI's SLOS992 document.
SN74HCS273RKSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Push-Pull
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 135 MHz
- Max Propagation Delay @ V, Max CL:
- 14.3ns @ 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:
- 20-VQFN (2.5x4.5)
SN74HCS273RKSR FAQ
1.How can I place an order for SN74HCS273RKSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCS273RKSR 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 SN74HCS273RKSR reliable?
The price and inventory of SN74HCS273RKSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCS273RKSR is usually 5 days.
3.What payment methods are accepted for SN74HCS273RKSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCS273RKSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HCS273RKSR?
SN74HCS273RKSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCS273RKSR 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 SN74HCS273RKSR?
For technical support, including SN74HCS273RKSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCS273RKSR requirements.
6.How does Aetrix verify that SN74HCS273RKSR is sourced from the original manufacturer or authorized distributors?
All SN74HCS273RKSR 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 SN74HCS273RKSR meets industry standards.
7.What is the process for return or replacement of SN74HCS273RKSR?
All SN74HCS273RKSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCS273RKSR, 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 SN74HCS273RKSR part is unused and in its original packaging.
Return procedure for SN74HCS273RKSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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