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Texas Instruments SN74HC273NS
- Part No.:
- SN74HC273NS
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74HC273NS.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,989
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Product details
Overview
SN74HC273NS from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with active-low asynchronous clear, operating from 2 V to 6 V, delivering ±4-mA output drive at 5 V, 12-ns typical propagation delay, and 80-µA maximum ICC - used in synchronous data latching and register storage within industrial control logic and digital instrumentation.
For engineers reviewing the SN74HC273NS datasheet, SN74HC273NS pinout, SN74HC273NS application, or SN74HC273NS equivalent, key selection criteria include its 20-pin SO package, direct-clear functionality, CMOS-level input compatibility, and guaranteed timing performance across –40°C to +85°C industrial temperature range.
Technical Context
The SN74HC273NS implements eight independent D-type flip-flops sharing a common clock (CLK) and global active-low clear (CLR), with each flip-flop capturing data on the rising edge of CLK while CLR forces all Q outputs low asynchronously. Its design follows standard HC-series CMOS logic architecture with rail-to-rail input thresholds and push-pull outputs.
It operates under recommended conditions of VCC = 2–6 V and TA = –40°C to +85°C, supports up to 10 LSTTL loads per output, and exhibits low input current (≤1 µA max) and low power consumption - making it suitable for noise-sensitive, battery-aware, and multi-stage logic interfacing applications without external level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | High-speed CMOS (HC), compatible with TTL input levels and driving LSTTL loads |
| Supply Voltage Range | 2 V to 6 V - enables operation from single Li-ion cells to 5-V legacy systems |
| Propagation Delay (tpd) | Typical 12 ns at VCC = 4.5 V - supports >21 MHz clock frequency in industrial temperature range |
| Output Drive | ±4 mA at 5 V - sufficient to directly drive LEDs, small buffers, or multiple gate inputs |
| Input Current | ≤1 µA max - minimizes loading on upstream drivers and preserves signal integrity |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and automation equipment |
| Clear Function | Asynchronous active-low CLR - enables immediate, clock-independent reset of all eight registers |
Pinout & Package
SN74HC273NS is housed in a 20-pin Small Outline Package (SO), body size 12.60 mm × 5.30 mm, with gull-wing leads, RoHS-compliant NiPdAu finish, and moisture sensitivity level (MSL) 1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLR | Active-low asynchronous clear input - forces all Q outputs low regardless of CLK state |
| 2, 5, 6, 9, 12, 15, 16, 19 | Q1–Q8 | Eight buffered, non-inverted registered outputs - each reflects corresponding D-input state after CLK↑ |
| 3, 4, 7, 8, 13, 14, 17, 18 | D1–D8 | Eight independent data inputs - sampled synchronously on rising CLK edge |
| 10 | GND | Ground reference for logic and power return - must be low-impedance connection |
| 11 | CLK | Single global clock input - rising-edge sensitive; triggers simultaneous capture across all eight flip-flops |
| 20 | VCC | Positive supply rail - bypassing with 0.1-µF ceramic capacitor near pin is mandatory for stable operation |
Key Features
| Feature | Design Value |
|---|---|
| Octal D-type flip-flop with shared clock and global clear | Enables compact 8-bit register implementation without external gating or glue logic |
| Wide 2-V to 6-V supply range | Supports mixed-voltage system integration - e.g., interfacing 3.3-V microcontrollers to 5-V peripherals |
| Low ICC (≤80 µA max) | Reduces standby power in always-on industrial controllers and remote sensor nodes |
| 12-ns typical tpd at 4.5 V | Meets timing budgets for high-speed control loops and real-time data acquisition sampling |
| ±4-mA output drive capability | Drives multiple LSTTL inputs or small-signal discrete loads without buffer amplification |
| CMOS input thresholds with ≤1-µA leakage | Minimizes input loading and prevents false triggering in high-impedance or long-trace PCB layouts |
Applications
| Industrial PLC I/O Register | Digital Instrumentation Latch |
|---|---|
|
Use Scenario: Capturing parallel status bits from field sensors (e.g., limit switches, pressure transducers) in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Synchronous 8-bit data latch synchronized to master scan clock; CLR used for emergency system-wide reset. Use Value: Ensures deterministic sampling window and eliminates metastability risk via controlled setup/hold timing (≥25 ns at 4.5 V). |
Use Scenario: Holding calibrated measurement values (e.g., ADC output words) in digital multimeters or oscilloscope front-ends until display update cycle. IC Role / Device Role / Timing Role: Nonvolatile register stage isolating conversion result from dynamic bus activity; CLK aligned to internal processing clock. Use Value: Provides glitch-free hold with 0 ns hold time requirement and <34 ns max tpd ensures sub-microsecond latency. |
| LED Matrix Row Driver | Pattern Generator for Test Equipment |
|
Use Scenario: Driving 8-row segments of multiplexed LED displays in industrial HMIs where brightness control requires precise duty-cycle timing. IC Role / Device Role / Timing Role: Row-enable register updated at scan rate; CLR resets all rows during blanking interval. Use Value: ±4-mA drive sustains consistent LED current across rows; SO package allows dense layout in space-constrained panels. |
Use Scenario: Generating fixed test vectors (e.g., PRBS, walking-1s) for functional validation of FPGA-based communication interfaces. IC Role / Device Role / Timing Role: Deterministic pattern sequencer using feedback XOR logic; CLK sourced from precision function generator. Use Value: Guaranteed 21-MHz max clock frequency at 85°C enables >20-MHz pattern rates; low jitter (<1 ns variation) preserves vector timing fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT273N | TTL-compatible input thresholds (VIH = 2 V min); otherwise identical pinout, timing, and drive | Better suited for direct interface with 5-V TTL logic families without level shifters | Select when interfacing legacy 5-V TTL systems; same SO package available as SN74HCT273NSR |
| 74AC273PC | Faster tpd (typ. 8.5 ns at 5 V); higher ICC (120 µA max); wider VCC range (2–6 V) | Higher speed required in test equipment or high-frequency counters; less suitable for ultra-low-power designs | Choose for timing-critical paths where 3–4 ns reduction in tpd justifies increased power and cost |
Compared with SN74HC273NS, SN74HCT273N offers improved 5-V TTL interoperability without layout changes, while 74AC273PC delivers measurable speed gain at the expense of higher static current - making SN74HC273NS optimal for balanced industrial register applications prioritizing power efficiency and broad voltage flexibility.
Availability
SN74HC273NS is available at Aetrix Electronics and suitable for industrial PLC modules, digital instrumentation, LED display controllers, and automated test equipment requiring stable component supply across extended product lifecycles.
Supply support for SN74HC273NS 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 ICs, with over 50 years of innovation in industrial, automotive, and communications markets.
The SN74HC273NS belongs to TI's industry-standard 74HC logic family, designed specifically for robust, low-power, wide-supply-range digital interfacing and register functions in harsh industrial environments.
FAQ
What is the maximum clock frequency supported by SN74HC273NS at 5 V and 85°C?
At VCC = 4.5 V and TA = +85°C, SN74HC273NS supports a maximum clock frequency of 21 MHz, as specified in Section 6.10 and 6.13 of the datasheet. This value accounts for worst-case process, voltage, and temperature (PVT) corners and ensures reliable setup/hold timing margins across all eight flip-flops in the device.
Does SN74HC273NS require external pull-up resistors on unused inputs?
Yes - all unused inputs of SN74HC273NS must be tied to either VCC or GND to prevent floating states that cause excessive current draw, logic instability, or ESD susceptibility. The datasheet explicitly mandates this in Section 6.3 and Layout Guidelines (Section 11.1), especially for the CLR and D inputs not in use.
Can SN74HC273NS drive LEDs directly without current-limiting resistors?
No - SN74HC273NS outputs provide ±4 mA drive capability at 5 V, but direct LED connection without series current-limiting resistors risks exceeding absolute maximum output current (±25 mA) and damaging the output stage. A resistor must be used to set forward current within safe limits (e.g., 4–10 mA typical).
What is the thermal resistance (RθJA) of the SN74HC273NS package?
The junction-to-ambient thermal resistance (RθJA) for SN74HC273NS in its SO package is 113.4 °C/W, as documented in Table 6.4 of the datasheet. This value assumes standard JEDEC 2-layer board conditions and informs thermal design for continuous operation at rated load and ambient temperature.
Is SN74HC273NS pin-compatible with SN74HC273N (PDIP) or SN74HC273DB (SSOP)?
Yes - SN74HC273NS shares identical pin configuration and function mapping with SN74HC273N (20-pin PDIP) and SN74HC273DB (20-pin SSOP), as confirmed in the Pin Configuration table (Section 5) and Device Information table. All variants use the same 20-pin layout with matching signal assignments and electrical behavior.
SN74HC273NS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.209", 5.30mm 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:
- 60 MHz
- Max Propagation Delay @ V, Max CL:
- 27ns @ 6V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 3 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74HC273NS FAQ
1.How can I place an order for SN74HC273NS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC273NS 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 SN74HC273NS reliable?
The price and inventory of SN74HC273NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC273NS is usually 5 days.
3.What payment methods are accepted for SN74HC273NS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC273NS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC273NS?
SN74HC273NS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC273NS 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 SN74HC273NS?
For technical support, including SN74HC273NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC273NS requirements.
6.How does Aetrix verify that SN74HC273NS is sourced from the original manufacturer or authorized distributors?
All SN74HC273NS 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 SN74HC273NS meets industry standards.
7.What is the process for return or replacement of SN74HC273NS?
All SN74HC273NS units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC273NS, 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 SN74HC273NS part is unused and in its original packaging.
Return procedure for SN74HC273NS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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