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Texas Instruments SN74AHC273DW
- Part No.:
- SN74AHC273DW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AHC273DW.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,845
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Product details
Overview
SN74AHC273DW from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with asynchronous clear, operating from 2 V to 5.5 V, featuring 8 independent data inputs and single-rail outputs, used for synchronous data latching in digital logic systems such as memory registers and pattern generation circuits.
For engineers reviewing the SN74AHC273DW datasheet, SN74AHC273DW pinout, SN74AHC273DW application, or SN74AHC273DW equivalent, key selection factors include its 20-pin SOIC (DW) package, 5.5-V tolerant inputs enabling 5 V → 3.3 V level translation, ±25 mA output drive capability, and guaranteed operation across –40°C to +125°C industrial temperature range.
Technical Context
This device implements eight independent D-type latches triggered on the rising edge of CLK, with a dedicated active-low CLR input that asynchronously resets all Q outputs to low regardless of clock state. Each D input directly controls its corresponding Q output, with no internal feedback or combinational logic between stages.
Input voltage tolerance up to 5.5 V allows interfacing with legacy 5-V logic while powered from 3.3-V supplies, and slow edge-rate design minimizes output ringing under light capacitive loads - critical for noise-sensitive board-level timing integrity in servers and network switches.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports mixed-voltage system integration and brown-out resilience down to 2 V. |
| Max Output Current | ±25 mA per output - sufficient to drive standard CMOS loads and small bus segments without external buffers. |
| Input Voltage Tolerance | Up to 5.5 V - enables direct connection to 5-V logic sources when VCC = 3.3 V, eliminating level-shifters. |
| Propagation Delay | Typ. 8.7 ns at VCC = 3.3 V, CL = 15 pF - ensures tight timing margins in high-speed register applications. |
| Operating Temperature | –40°C to +125°C - qualified for industrial and extended-temperature embedded control environments. |
| ESD Rating | ±2000 V HBM - meets JEDEC JESD22-A114-A for robust handling in automated assembly lines. |
Pinout & Package
SN74AHC273DW is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 10.3 mm (body size 12.8 mm × 7.5 mm), with gull-wing leads and standard JEDEC MS-013 outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLR | Asynchronous clear input - forces all Q outputs low when asserted low, independent of CLK. |
| 2 | 1Q | Output for first flip-flop - reflects stored value of 1D on positive CLK edge. |
| 3 | 1D | Data input for first flip-flop - sampled at CLK rising edge if setup/hold times met. |
| 4 | 2D | Data input for second flip-flop - electrically isolated from other D inputs. |
| 5 | 2Q | Output for second flip-flop - non-inverting, single-rail CMOS output stage. |
| 6 | 3Q | Output for third flip-flop - shares same timing characteristics and drive strength as 1Q/2Q. |
| 7 | 3D | Data input for third flip-flop - requires minimum 5.5 ns setup time before CLK↑ at VCC = 3.3 V. |
| 8 | 4D | Data input for fourth flip-flop - no internal coupling to adjacent stages. |
| 9 | 4Q | Output for fourth flip-flop - compatible with standard 3.3-V or 5-V CMOS logic families. |
| 10 | GND | Ground reference - must be connected to system ground plane for stable operation and EMI control. |
| 11 | CLK | Clock input - rising-edge sensitive; triggering occurs at fixed voltage threshold, not transition rate. |
| 12 | 5Q | Output for fifth flip-flop - identical electrical specs to other Q outputs. |
| 13 | 5D | Data input for fifth flip-flop - supports same VIH/VIL thresholds as all D inputs. |
| 14 | 6D | Data input for sixth flip-flop - tolerant to 5.5-V inputs regardless of VCC setting. |
| 15 | 6Q | Output for sixth flip-flop - capable of sourcing/sinking ±25 mA continuously. |
| 16 | 7Q | Output for seventh flip-flop - designed for low-output ringing in high-speed routing. |
| 17 | 7D | Data input for seventh flip-flop - unaffected by CLK state when not transitioning. |
| 18 | 8D | Data input for eighth flip-flop - fully independent timing domain per channel. |
| 19 | 8Q | Output for eighth flip-flop - matches propagation delay and skew of other Q outputs. |
| 20 | VCC | Power supply - bypass capacitor (0.1 µF) required near pin for stable switching performance. |
Key Features
| Feature | Design Value |
|---|---|
| 5.5-V tolerant inputs | Enables direct interface with 5-V logic in 3.3-V systems without external level shifters or resistive dividers. |
| Asynchronous clear | Allows global reset of all eight outputs independently of clock phase - essential for power-up initialization and fault recovery. |
| Low-output ringing design | Controlled edge rates reduce EMI and signal integrity issues in high-density PCB layouts with unterminated traces. |
| Industrial temperature range | Validated operation from –40°C to +125°C supports deployment in automotive engine control modules and industrial PLCs. |
| JESD 22 ESD compliance | ±2000 V HBM and ±1000 V CDM ratings ensure reliability during automated PCB assembly and field service handling. |
Applications
| Memory Register Storage | Pattern Generation |
|---|---|
Use Scenario: Holding 8-bit parallel data from microcontroller GPIO or address/data bus during multi-cycle operations. IC Role / Device Role / Timing Role: Synchronous latch providing edge-triggered storage with simultaneous update on CLK↑. Use Value: Eliminates need for discrete latch ICs or FPGA logic resources; supports deterministic timing via guaranteed setup/hold windows. |
Use Scenario: Generating repeating binary sequences (e.g., 0x55, 0xAA) for test stimulus or LED animation control. IC Role / Device Role / Timing Role: Eight-stage shift register element when cascaded with feedback or external logic. Use Value: Provides deterministic, glitch-free output transitions with minimal external components due to controlled edge rates. |
| Server I/O Buffering | Network Switch Control Logic |
Use Scenario: Isolating and synchronizing status signals (e.g., fan speed, temperature alerts) between server management controller and baseboard management unit. IC Role / Device Role / Timing Role: Level-translating register buffering 5-V sensor outputs into 3.3-V BMC domain. Use Value: Input overvoltage tolerance avoids signal conditioning circuitry; wide VCC range accommodates varying rail tolerances. |
Use Scenario: Capturing port configuration bits from switch fabric ASICs before forwarding to PHY layer controllers. IC Role / Device Role / Timing Role: Edge-aligned data capture element ensuring setup/hold compliance in multi-Gbps backplane timing domains. Use Value: Low propagation delay variation (<1.5 ns skew) maintains inter-channel timing alignment across 8-bit control words. |
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 |
|---|---|---|---|
| SN74LVC273PWR | Lower VCC range (1.65–3.6 V); 3.6-V max input tolerance; faster tPLH/tPHL (typ. 4.2 ns @ 3.3 V). | Better suited for pure 3.3-V or 2.5-V systems; not compatible with 5-V input sources. | Select when operating exclusively below 3.6 V and requiring higher speed; avoid if interfacing with 5-V logic. |
| 74AHC273PW,118 | Same AHC family specs; packaged in TSSOP-20 (PW) with smaller footprint (6.5 mm × 6.4 mm) and higher thermal resistance (RθJA = 116.8°C/W). | Preferred for space-constrained designs; requires tighter thermal management due to lower power dissipation margin. | Choose for compact PCB layouts where SOIC footprint is prohibitive; verify thermal derating at full load. |
Compared with SN74AHC273DW, SN74LVC273PWR offers higher speed but sacrifices 5-V input compatibility, while 74AHC273PW,118 retains full functional equivalence with reduced board area at the cost of thermal performance - making DW optimal for industrial applications needing robustness and mixed-voltage support.
Availability
SN74AHC273DW is available at Aetrix Electronics and suitable for industrial control systems, server management subsystems, and network infrastructure equipment requiring stable component supply and long-term lifecycle support.
Supply support for SN74AHC273DW 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 digital ICs.
The SN74AHC273DW belongs to TI's advanced high-speed CMOS (AHC) logic family, engineered for low-power, high-noise-immunity digital interfacing in industrial, computing, and communications applications.
FAQ
What is the maximum clock frequency supported by SN74AHC273DW?
The SN74AHC273DW supports up to 100 MHz maximum clock frequency at VCC = 5 V and CL = 15 pF, and 65 MHz at VCC = 3.3 V under the same load condition. These values are specified in the switching characteristics tables and assume proper layout, bypassing, and signal integrity practices - actual usable frequency depends on board-level parasitics and timing margins.
Can SN74AHC273DW be used with a 3.3-V supply while accepting 5-V input signals?
Yes, SN74AHC273DW supports 5.5-V tolerant inputs, allowing it to accept 5-V logic levels even when powered from a 3.3-V supply. This makes SN74AHC273DW ideal for voltage translation in mixed-signal systems, eliminating the need for external level-shifting components while maintaining full timing compliance.
What is the function of the CLR pin on SN74AHC273DW?
The CLR pin on SN74AHC273DW is an active-low asynchronous clear input that forces all eight Q outputs to logic low immediately upon assertion, regardless of clock state or data inputs. It operates independently of CLK and does not require a clock edge - critical for system initialization and error recovery sequences.
Is SN74AHC273DW pin-compatible with other members of the SN74AHC273 family?
Yes, SN74AHC273DW shares identical pinout and functionality with all other package variants of SN74AHC273 (e.g., DB, DGV, NS, PW), including matching pin numbering, signal assignments, and electrical behavior - enabling drop-in replacement across SOIC, SSOP, TVSOP, and TSSOP packages without PCB redesign.
Does SN74AHC273DW require external pull-up or pull-down resistors on unused inputs?
Yes, all unused inputs on SN74AHC273DW - including D, CLK, and CLR - must be tied to either VCC or GND to prevent floating states that could cause increased current consumption, erratic output behavior, or ESD susceptibility. TI recommends connecting unused D inputs to GND or VCC depending on desired default latch state.
SN74AHC273DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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:
- 110 MHz
- Max Propagation Delay @ V, Max CL:
- 11ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 2V ~ 5.5V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 2.5 pF
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74AHC273DW FAQ
1.How can I place an order for SN74AHC273DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC273DW 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 SN74AHC273DW reliable?
The price and inventory of SN74AHC273DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC273DW is usually 5 days.
3.What payment methods are accepted for SN74AHC273DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC273DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC273DW?
SN74AHC273DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC273DW 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 SN74AHC273DW?
For technical support, including SN74AHC273DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC273DW requirements.
6.How does Aetrix verify that SN74AHC273DW is sourced from the original manufacturer or authorized distributors?
All SN74AHC273DW 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 SN74AHC273DW meets industry standards.
7.What is the process for return or replacement of SN74AHC273DW?
All SN74AHC273DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC273DW, 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 SN74AHC273DW part is unused and in its original packaging.
Return procedure for SN74AHC273DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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