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Texas Instruments SN74HCT273PW
- Part No.:
- SN74HCT273PW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HCT273PW.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:738
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Product details
Overview
SN74HCT273PW from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with common asynchronous clear (CLR), operating at 4.5V–5.5V, delivering 12ns typical propagation delay, ±4mA output drive, and 80µA maximum ICC. It serves as a synchronous storage register in digital control logic, bus interface buffering, and pattern generation circuits.
For engineers reviewing the SN74HCT273PW datasheet, SN74HCT273PW pinout, SN74HCT273PW application, or SN74HCT273PW equivalent, key selection criteria include TTL-compatible input thresholds, 20-pin TSSOP package constraints, single-rail 5V operation, and edge-triggered register behavior with global reset functionality.
Technical Context
The SN74HCT273PW implements eight independent D-type latches synchronized to the rising edge of CLK, with all Q outputs simultaneously cleared by a low-active CLR signal. Its HCT logic family ensures TTL-voltage compatibility while maintaining CMOS power efficiency.
It operates strictly within 4.5V–5.5V supply range and supports –40°C to +85°C ambient temperature. Timing parameters are specified for both 4.5V and 5.5V VCC, with minimum clock frequency support up to 20MHz at 4.5V and 23MHz at 5.5V under industrial conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - TTL-compatible inputs, CMOS power efficiency, 5V-only operation |
| Supply Voltage Range | 4.5V–5.5V - Requires stable 5V rail; no wide-VCC flexibility |
| Propagation Delay (tpd) | 12ns typical at 5V - Enables ≤23MHz synchronous operation in industrial temp range |
| Output Drive | ±4mA at 5V - Sufficient to drive 10 LSTTL loads directly |
| Input Compatibility | TTL voltage thresholds (VIH = 2V, VIL = 0.8V) - Interoperable with legacy 74LS logic without level shifters |
| Quiescent Current (ICC) | 80µA max - Ultra-low static power for always-on register applications |
| Operating Temperature | –40°C to +85°C - Qualified for industrial environments, not automotive |
Pinout & Package
Packaged in a 20-pin Thin Shrink Small Outline Package (TSSOP, PW), body size 6.5mm × 4.4mm, height ≤1.2mm, with gull-wing leads on 0.65mm pitch. Thermal pad is optional and may be left floating or connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CLR) | Asynchronous clear input | Active-low global reset; forces all Q outputs low regardless of CLK state |
| 2–9, 12, 15–16, 19 (1Q–8Q) | Eight registered outputs | Edge-triggered Q states reflect D inputs sampled at CLK↑; retain value between clocks |
| 3–4, 7–8, 13–14, 17–18 (1D–8D) | Eight data inputs | Sampled only on rising CLK edge; ignored during hold/setup violations |
| 10 (GND) | Ground reference | Return path for all internal logic and I/O; must be low-impedance |
| 11 (CLK) | Clock input | Rising-edge sensitive; no internal debouncing - external clean clock required |
| 20 (VCC) | Positive supply | Single 5V rail; requires local 0.1µF bypass capacitor per device |
Key Features
| Feature | Design Value |
|---|---|
| Octal D-type flip-flop architecture | Eight independent registers sharing one CLK and one CLR - ideal for parallel data capture |
| Asynchronous active-low clear | Immediate, unconditional reset of all outputs without waiting for clock edge |
| TTL-compatible input thresholds | VIH = 2V, VIL = 0.8V - seamless integration into mixed 74LS/74HCT systems |
| Low-power CMOS core | 80µA max ICC enables use in power-constrained industrial controllers |
| 20-pin TSSOP footprint | 6.5mm × 4.4mm body - space-efficient for high-density PCBs without thermal vias required |
Applications
| Buffer or Storage Registers | Shift Registers |
|---|---|
Use Scenario: Holding parallel data from microcontroller GPIO ports before serial transmission or DAC update. IC Role / Device Role / Timing Role: Synchronous latch array capturing 8-bit parallel words on CLK↑, with instantaneous reset via CLR. Use Value: Eliminates need for discrete gating logic; provides deterministic setup/hold timing (25ns min tsu at 4.5V) for reliable sampling. | Use Scenario: Constructing 8-bit unidirectional shift register using cascaded D-flip-flops with feedback routing. IC Role / Device Role / Timing Role: Eight-stage register stage with shared clock and reset - each stage advances data on CLK↑. Use Value: Reduces component count vs. discrete flip-flops; maintains consistent tpd (12ns typ) across all stages for predictable timing. |
| Pattern Generators | Digital Control Logic |
Use Scenario: Generating fixed test patterns (e.g., walking 1s, checkerboard) for FPGA or ASIC validation. IC Role / Device Role / Timing Role: Preloaded register bank driven by sequencer logic; CLR initializes known state before pattern start. Use Value: Guarantees repeatable startup condition; ±4mA drive ensures robust fanout to multiple test points or logic analyzers. | Use Scenario: Storing configuration bits for peripheral enable/disable, mode selection, or status flags in embedded systems. IC Role / Device Role / Timing Role: Nonvolatile storage element synchronized to system clock domain; CLR resets to safe default on power-up. Use Value: Provides glitch-free initialization and avoids undefined startup states in safety-critical control paths. |
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 |
|---|---|---|---|
| SN74HCT377PW | Same 20-pin TSSOP package, but features clock-enable (OE) instead of CLR; no asynchronous reset | Suitable where gated clocking is preferred over global reset; incompatible for CLR-dependent initialization sequences | Select SN74HCT377PW only if system design uses clock enable for power gating or conditional latching |
| SN74ACT273PW | ACT family: higher speed (25MHz min fmax at 4.5V), wider VCC range (4.5V–5.5V), but higher ICC (200µA max) | Better for high-speed timing-critical paths; less suitable for ultra-low-power standby modes | Choose SN74ACT273PW when propagation delay <10ns and fanout >10 LSTTL loads are required |
Compared with SN74HCT377PW and SN74ACT273PW, the SN74HCT273PW uniquely balances low static power, guaranteed asynchronous reset, and TTL compatibility - making it optimal for industrial register banks requiring deterministic initialization and minimal quiescent consumption.
Availability
SN74HCT273PW is available at Aetrix Electronics and suitable for industrial control systems, digital instrumentation, legacy logic upgrades, and embedded microcontroller interface buffering requiring stable component supply and long-term sourcing continuity.
Supply support for SN74HCT273PW 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 U.S.-based semiconductor company specializing in analog, embedded processing, and logic solutions, with decades of leadership in industry-standard logic families.
The SN74HCT273PW belongs to TI's 74HCT logic series, designed specifically for 5V systems requiring TTL input compatibility, low power, and robust noise immunity in industrial and commercial applications.
FAQ
What is the maximum clock frequency supported by the SN74HCT273PW?
The SN74HCT273PW supports up to 23MHz maximum clock frequency at VCC = 5.5V and TA = –40°C to +85°C. At 4.5V, the guaranteed minimum fmax is 20MHz under the same temperature range. These values derive from timing specifications in Section 5.5 of the official TI datasheet SCLS068H.
Does the SN74HCT273PW require external pull-up or pull-down resistors on unused inputs?
Yes - all unused inputs of the SN74HCT273PW must be tied to either VCC or GND to prevent floating states that cause excessive current draw or metastability. This requirement is explicitly stated in Section 5.2 of the SN74HCT273PW datasheet and applies to any unconnected D, CLK, or CLR pins.
Is the SN74HCT273PW pin-compatible with other 20-pin 74xx273 variants like SN74HCT273N or SN74HCT273PWR?
Yes - the SN74HCT273PW shares identical pinout and logic function with all SN74HCT273 variants including SN74HCT273N (PDIP) and SN74HCT273PWR (TSSOP). The PW and PWR suffixes denote the same TSSOP package; SN74HCT273PW is the base orderable part number, while SN74HCT273PWR is the tape-and-reel version.
Can the SN74HCT273PW operate at 3.3V?
No - the SN74HCT273PW is rated exclusively for 4.5V–5.5V operation. Its TTL-compatible input thresholds (VIH = 2.0V min) and internal HCT circuitry are not characterized or guaranteed below 4.5V. For 3.3V systems, consider the SN74LVC273 or SN74ALVC273 families instead.
What is the purpose of the thermal pad on the SN74HCT273PW package?
The exposed thermal pad on the SN74HCT273PW (TSSOP) package may be left floating or connected to GND - it is not electrically functional and serves only as a mechanical anchor and minor thermal relief path. TI documentation explicitly states it must not be connected to any signal or supply voltage other than GND.
SN74HCT273PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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:
- 37 MHz
- Max Propagation Delay @ V, Max CL:
- 29ns @ 5.5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 4mA, 4mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- 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-TSSOP
SN74HCT273PW FAQ
1.How can I place an order for SN74HCT273PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT273PW 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 SN74HCT273PW reliable?
The price and inventory of SN74HCT273PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT273PW is usually 5 days.
3.What payment methods are accepted for SN74HCT273PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCT273PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HCT273PW?
SN74HCT273PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT273PW 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 SN74HCT273PW?
For technical support, including SN74HCT273PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT273PW requirements.
6.How does Aetrix verify that SN74HCT273PW is sourced from the original manufacturer or authorized distributors?
All SN74HCT273PW 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 SN74HCT273PW meets industry standards.
7.What is the process for return or replacement of SN74HCT273PW?
All SN74HCT273PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT273PW, 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 SN74HCT273PW part is unused and in its original packaging.
Return procedure for SN74HCT273PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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