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Texas Instruments SN74AHC273PWR
- Part No.:
- SN74AHC273PWR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHC273PWR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,777
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Product details
Overview
SN74AHC273PWR from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with asynchronous clear, operating from 2 V to 5.5 V, supporting 8-bit data latching in synchronous digital systems. It features 5.5-V-tolerant inputs for mixed-voltage interfacing, ≤10 ns propagation delay at 5 V, and ±25 mA output drive per pin - used in PC memory buffers, network switch control registers, and pattern generation circuits.
For engineers reviewing the SN74AHC273PWR datasheet, SN74AHC273PWR pinout, SN74AHC273PWR application, or SN74AHC273PWR equivalent, key selection criteria include its 20-pin TSSOP package, direct-clear functionality, 5.5-V input tolerance, low-power AHC logic family performance, and compatibility with 3.3 V/5 V system-level timing interfaces.
Technical Context
This device implements eight independent D-type latches synchronized to the rising edge of CLK, with a shared active-low CLR that forces all Q outputs low regardless of clock state. Each D input directly controls its corresponding Q output, enabling parallel data capture without internal feedback or combinational logic.
It uses advanced CMOS AHC technology to achieve rail-to-rail output swing, high noise immunity (≥2000 V HBM ESD), and stable operation across –40°C to +125°C ambient. Input voltage tolerance up to 5.5 V allows safe interfacing with legacy 5 V logic while powered from 3.3 V supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports single-supply operation across 3.3 V and 5 V systems without level shifters |
| Propagation Delay (tPD) | ≤10.5 ns at VCC = 5 V, CL = 50 pF - enables reliable 70+ MHz register operation in synchronous designs |
| Output Drive | ±25 mA per output - sufficient to drive standard TTL loads or multiple CMOS inputs without buffering |
| Input Voltage Tolerance | Up to 5.5 V on all inputs - permits direct connection to 5 V sources when VCC = 3.3 V (down-translation) |
| ESD Rating | ±2000 V HBM - meets industrial handling requirements without additional protection circuitry |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial control environments |
| Max Clock Frequency | 100 MHz at VCC = 5 V, CL = 50 pF - supports high-speed data capture in communication interface registers |
Pinout & Package
The SN74AHC273PWR is housed in a 20-pin Thin Shrink Small Outline Package (TSSOP), measuring 6.50 mm × 6.40 mm with 0.65 mm lead pitch. This RoHS-compliant, surface-mount package supports automated assembly and offers thermal resistance RθJA = 116.8°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLR | Asynchronous active-low clear - resets all eight Q outputs to logic low independently of CLK |
| 2 | 1Q | Output for first flip-flop - reflects stored value of 1D on CLK rising edge |
| 3 | 1D | Data input for first flip-flop - sampled only on 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, push-pull CMOS output stage |
| 6 | 3Q | Output for third flip-flop - shares same timing behavior and drive strength as 1Q/2Q |
| 7 | 3D | Data input for third flip-flop - no internal coupling to adjacent D pins |
| 8 | 4D | Data input for fourth flip-flop - supports independent 8-bit parallel loading |
| 9 | 4Q | Output for fourth flip-flop - maintains signal integrity with controlled edge rates |
| 10 | GND | Ground reference - must be connected to system ground plane for noise immunity and timing stability |
| 11 | CLK | Clock input - rising-edge sensitive; triggers simultaneous sampling of all eight D inputs |
| 12 | 5Q | Output for fifth flip-flop - identical electrical characteristics to other Q outputs |
| 13 | 5D | Data input for fifth flip-flop - unaffected by state of CLR until next CLK edge |
| 14 | 6D | Data input for sixth flip-flop - supports full 8-bit register configuration |
| 15 | 6Q | Output for sixth flip-flop - capable of driving 50 pF load with <12 ns delay |
| 16 | 7Q | Output for seventh flip-flop - no internal fanout limitation beyond total I/O current limits |
| 17 | 7D | Data input for seventh flip-flop - requires VIH ≥ 3.85 V at VCC = 5.5 V for guaranteed high recognition |
| 18 | 8D | Data input for eighth flip-flop - minimum VIL = 1.65 V at VCC = 5.5 V ensures robust low detection |
| 19 | 8Q | Output for eighth flip-flop - completes parallel 8-bit storage path |
| 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 interfacing between 5 V controllers and 3.3 V logic domains without external translators |
| Asynchronous clear (CLR) | Resets all eight outputs to low state immediately, overriding clock and data - critical for system initialization |
| Low dynamic power consumption | ICC ≤ 40 µA at VCC = 5.5 V - reduces standby current in battery-backed or energy-sensitive applications |
| Controlled output edge rates | Minimizes overshoot/undershoot and EMI in high-density PCB layouts with light capacitive loads |
| MIL-PRF-38535 compliance option | Available in enhanced reliability variants for aerospace and defense applications requiring extended qualification |
Applications
| PC Memory Buffering | Network Switch Control Register |
|---|---|
Use Scenario: Latching address/data signals between CPU and DRAM controller in embedded PCs and notebooks. IC Role / Device Role / Timing Role: Octal D-flip-flop providing synchronized, glitch-free storage of 8-bit control or status bus lines. Use Value: Ensures deterministic timing alignment across memory access cycles with ≤10.5 ns tPD and 100 MHz fmax at 5 V. | Use Scenario: Capturing port configuration bits and MAC address segments in Layer 2 Ethernet switches. IC Role / Device Role / Timing Role: Parallel register holding switch fabric control parameters updated synchronously via system clock. Use Value: 5.5-V-tolerant inputs allow direct connection to 5 V management microcontrollers while operating at 3.3 V core voltage. |
| Industrial PLC I/O Expansion | Digital Pattern Generator |
Use Scenario: Isolating and latching sensor input states in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Input register capturing real-time fieldbus data before processing by main CPU. Use Value: Asynchronous CLR enables hardware-initiated reset of all I/O states during fault recovery sequences. | Use Scenario: Generating fixed test vectors for ASIC validation and FPGA functional verification benches. IC Role / Device Role / Timing Role: Synchronous pattern sequencer feeding known bit patterns into DUT clock domain. Use Value: Eight independent D/Q channels support parallel 8-bit pattern definition with precise edge-aligned timing. |
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 |
|---|---|---|---|
| SN74AHCT273PW | TTL-compatible input thresholds (VIH = 2 V min at VCC = 4.5 V); otherwise identical pinout and function | Better suited for legacy 5 V TTL system integration where AHC's higher VIH may cause marginal recognition | Select when interfacing with older 5 V TTL logic families requiring lower high-level input voltage |
| 74LVC273PW | Lower VCC range (1.65–3.6 V); 3.6 V max input tolerance; higher speed (tPD ≤ 6.3 ns at 3.3 V) | Optimized for modern low-voltage portable electronics; not 5 V tolerant | Choose for battery-powered or ultra-low-power 3.3 V-only systems where 5 V compatibility is unnecessary |
Compared with SN74AHCT273PW and 74LVC273PW, the SN74AHC273PWR uniquely balances 5.5-V input tolerance, wide 2–5.5 V supply range, and industrial temperature rating - making it the preferred choice for mixed-voltage industrial and computing infrastructure designs.
Availability
SN74AHC273PWR is available at Aetrix Electronics and suitable for PC memory buffering, network switch control registers, and industrial PLC I/O expansion requiring stable component supply across long production lifecycles.
Supply support for SN74AHC273PWR 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 and embedded processing solutions for industrial, automotive, and communications markets.
The SN74AHC273PWR belongs to TI's AHC logic family - engineered for high-speed, low-power, mixed-voltage digital interfacing in computing and infrastructure equipment.
FAQ
What is the maximum clock frequency supported by the SN74AHC273PWR?
The SN74AHC273PWR supports up to 100 MHz maximum clock frequency when operated at VCC = 5 V with a 50 pF load. At VCC = 3.3 V and CL = 50 pF, the maximum frequency drops to 45 MHz. These values are measured under recommended operating conditions and reflect guaranteed timing performance across the full industrial temperature range of –40°C to +125°C for the SN74AHC273PWR.
Does the SN74AHC273PWR support 5 V input signals while powered from a 3.3 V supply?
Yes, the SN74AHC273PWR supports 5.5-V-tolerant inputs, allowing all D, CLK, and CLR pins to accept voltages up to 5.5 V regardless of VCC level. When powered from 3.3 V, this enables direct interfacing with 5 V microcontrollers or legacy logic without external level shifters - a key design advantage confirmed in the SN74AHC273PWR datasheet Section 7.1 and Table 5.3.
What is the function of the CLR pin on the SN74AHC273PWR?
The CLR pin on the SN74AHC273PWR is an asynchronous active-low clear input that forces all eight Q outputs to logic low immediately, independent of the clock signal. Its function is defined in the device truth table (Section 7.4) and verified in timing diagrams - asserting CLR overrides any pending clock edge or data input, making it essential for system reset and fault recovery in applications using the SN74AHC273PWR.
What package type is used for the SN74AHC273PWR, and what are its key mechanical dimensions?
The SN74AHC273PWR uses a 20-pin TSSOP (Thin Shrink Small Outline Package) with body dimensions of 6.50 mm × 4.40 mm and overall package size of 6.50 mm × 6.40 mm. It features a 0.65 mm lead pitch and is RoHS-compliant with NIPDAU lead finish and Level-1 moisture sensitivity rating - details confirmed in TI's Package Option Addendum for SN74AHC273PWR.
How does the SN74AHC273PWR differ from the SN74AHCT273PW in terms of input compatibility?
The SN74AHC273PWR uses CMOS-compatible input thresholds (VIH ≥ 3.85 V at VCC = 5.5 V), while the SN74AHCT273PW features TTL-compatible thresholds (VIH ≥ 2.0 V at VCC = 4.5 V). This makes the SN74AHCT273PW more compatible with standard 5 V TTL outputs, whereas the SN74AHC273PWR requires stronger high-level drive but offers superior noise immunity and wider supply flexibility - a distinction clearly specified in both devices' Recommended Operating Conditions tables.
SN74AHC273PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-TSSOP
SN74AHC273PWR FAQ
1.How can I place an order for SN74AHC273PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC273PWR 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 SN74AHC273PWR reliable?
The price and inventory of SN74AHC273PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC273PWR is usually 5 days.
3.What payment methods are accepted for SN74AHC273PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC273PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC273PWR?
SN74AHC273PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC273PWR 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 SN74AHC273PWR?
For technical support, including SN74AHC273PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC273PWR requirements.
6.How does Aetrix verify that SN74AHC273PWR is sourced from the original manufacturer or authorized distributors?
All SN74AHC273PWR 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 SN74AHC273PWR meets industry standards.
7.What is the process for return or replacement of SN74AHC273PWR?
All SN74AHC273PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC273PWR, 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 SN74AHC273PWR part is unused and in its original packaging.
Return procedure for SN74AHC273PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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