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Texas Instruments CD74AC273EG4
- Part No.:
- CD74AC273EG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74AC273EG4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,162
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Product details
Overview
CD74AC273EG4 from Texas Instruments is an octal D-type flip-flop with asynchronous master reset, implemented in advanced CMOS logic. It transfers data from eight D inputs to corresponding Q outputs on the rising edge of a common clock (CP), with independent low-level active reset (MR). Key confirmed parameters: 1.5–5.5 V supply range, 6.5 ns typical propagation delay at 5 V/25°C/50 pF, ±24 mA output drive, and operation across –55°C to +125°C. It serves as a synchronous data latch in digital control registers and bus interface logic.
For engineers reviewing the CD74AC273EG4 datasheet, CD74AC273EG4 pinout, CD74AC273EG4 application, or CD74AC273EG4 equivalent, this page delivers verified functional identity, exact pin functions, real-world timing behavior under load, absolute maximum ratings, and validated alternative options for industrial-grade logic design and legacy system replacement.
Technical Context
The CD74AC273EG4 implements eight edge-triggered D flip-flops sharing one clock input (CP) and one active-low master reset (MR), enabling synchronized state capture and global initialization without clock dependency. Its SCR-latchup-resistant CMOS process ensures robustness in noisy industrial environments.
It supports wide-voltage operation (1.5 V to 5.5 V) with balanced noise immunity-30% of VCC-and meets AC-series specifications including 10 pF input capacitance, 45 pF power dissipation capacitance, and guaranteed 114 MHz max clock frequency at 5 V and 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5 V to 5.5 V - enables direct interfacing with 1.8 V, 2.5 V, 3.3 V, and 5 V logic families without level shifters |
| Propagation Delay (CP→Q) | 3.5 ns (typ) at 5 V - supports high-speed synchronous data capture up to 100 MHz in worst-case temperature conditions |
| Output Drive Current | ±24 mA - drives 50 Ω transmission lines directly and fans out to 15 FAST™ ICs without buffers |
| Operating Temperature | –55°C to +125°C - qualified for extended-temperature industrial and automotive under-hood applications |
| Input Capacitance | 10 pF - minimizes loading on preceding drivers and preserves signal integrity in high-frequency clock distribution |
| Quiescent Supply Current | 8 μA (max at 25°C) - enables ultra-low static power consumption in battery-backed or energy-sensitive systems |
Pinout & Package
CD74AC273EG4 is packaged in a 20-pin PDIP (Plastic Dual In-line Package) with body size 24.33 mm × 6.35 mm and full package size 24.33 mm × 9.4 mm. Pin 1 is located at the left end of the top row, identified by a notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 !MR | Asynchronous master reset input | Active-low signal that forces all Q outputs low independently of clock edge; critical for system initialization and fault recovery |
| 2 Q0 | Data output | Complementary output for D0 latch; provides registered data path for bit 0 in parallel bus or control register applications |
| 3 D0 | Data input | Primary data input for first flip-flop; must meet setup/hold time (2 ns min) relative to CP rising edge |
| 4 D1 | Data input | Primary data input for second flip-flop; shares same timing constraints and electrical characteristics as D0 |
| 5 Q1 | Data output | Complementary output for D1 latch; maintains consistent timing relationship with Q0 for parallel word transfer |
| 6 Q2 | Data output | Output for third flip-flop; used in multi-bit counter stages or status register bit fields |
| 7 D2 | Data input | Input for third flip-flop; part of contiguous D0–D7 group supporting 8-bit parallel data capture |
| 8 D3 | Data input | Input for fourth flip-flop; electrically identical to other D inputs with 10 pF capacitance and TTL-compatible thresholds |
| 9 Q3 | Data output | Output for fourth flip-flop; enables full byte-wide latching when used with Q0–Q7 |
| 10 GND | Ground reference | Primary return path for all internal logic and I/O; requires low-inductance connection to minimize ground bounce |
| 11 CP | Clock input | Rising-edge-triggered clock for all eight flip-flops; slew rate limited to 20 ns max (3.6–5.5 V) to ensure reliable edge detection |
| 12 Q4 | Data output | Output for fifth flip-flop; extends parallel register capability to full 8-bit width |
| 13 D4 | Data input | Fifth data input; completes lower half of octal structure and supports byte-aligned data paths |
| 14 D5 | Data input | Sixth data input; matches D0–D3 in voltage thresholds (VIH = 3.85 V min at 5.5 V) and leakage (<±1 μA) |
| 15 Q5 | Data output | Sixth output; used in address latches, configuration registers, or pipeline stage storage |
| 16 Q6 | Data output | Seventh output; supports multi-bit control word generation in programmable logic interfaces |
| 17 D6 | Data input | Seventh data input; shares same input hysteresis and ESD rating (±2000 V HBM) as all inputs |
| 18 D7 | Data input | Eighth and final data input; completes full octal D register functionality |
| 19 Q7 | Data output | Eighth and final output; provides complete 8-bit registered output bus for microcontroller peripheral interfacing |
| 20 VCC | Power supply | Positive supply rail; requires local 0.1 μF ceramic bypass capacitor placed within 5 mm of pin to suppress switching noise |
Key Features
| Feature | Design Value |
|---|---|
| Buffered inputs | Reduces capacitive loading on upstream drivers and improves noise rejection across full operating voltage range |
| SCR-latchup-resistant CMOS | Prevents destructive latch-up during transient overvoltage events in industrial power environments |
| Balanced propagation delays | Ensures simultaneous Q-output transitions across all eight bits, minimizing skew in parallel data paths |
| 1.5 V to 5.5 V operation | Eliminates need for external level translators when interfacing mixed-voltage subsystems (e.g., 3.3 V MCU to 5 V legacy peripherals) |
| ±24 mA output drive | Directly terminates 50 Ω transmission lines and drives multiple TTL/CMOS loads without external buffers |
Applications
| Industrial PLC I/O Expansion | Digital Audio Sample Buffering |
|---|---|
Use Scenario: Latching sensor status or actuator commands in modular I/O racks where microcontroller GPIO is limited. IC Role / Device Role / Timing Role: Synchronous 8-bit parallel register providing deterministic sampling window aligned to system clock domain. Use Value: Enables reliable capture of fast-changing fieldbus signals (e.g., encoder quadrature, limit switch edges) with sub-10 ns timing margin at 5 V. | Use Scenario: Holding stereo audio sample words between ADC acquisition and DSP processing in embedded audio codecs. IC Role / Device Role / Timing Role: Edge-triggered data latch synchronizing 16-bit audio samples to a shared frame clock. Use Value: Provides glitch-free sample hold with <13.5 ns max propagation delay, preserving SNR in 96 kHz audio paths. |
| Automotive Body Control Module | Legacy Industrial Bus Interface |
Use Scenario: Storing door lock, mirror position, and lighting configuration states in AEC-Q100-compliant body controllers. IC Role / Device Role / Timing Role: Nonvolatile register element holding user-configurable settings across power cycles via external EEPROM handshake. Use Value: Operates reliably at –40°C to +125°C ambient with <8 μA quiescent current, reducing parasitic drain on vehicle battery. | Use Scenario: Adapting modern microcontrollers to legacy parallel buses such as ISA or proprietary backplane protocols. IC Role / Device Role / Timing Role: Bidirectional data register buffering write data to and read data from 8-bit parallel address/data multiplexed buses. Use Value: Supports 114 MHz max clock rate and ±24 mA drive, matching timing requirements of 80286-era peripherals without timing glue logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D flip-flop with reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AC273N | Same AC logic family, identical pinout, but manufactured by TI with different packaging code (N = PDIP); identical electrical specs and timing. | No functional difference; suitable for drop-in replacement where part marking or RoHS compliance history differs. | Select when sourcing consistency with TI's standard commercial catalog line is required. |
| CD74ACT273E | TTL-compatible input thresholds (VIH = 2.0 V min), higher drive strength at 5 V, but narrower 4.5–5.5 V supply range versus CD74AC273EG4's 1.5–5.5 V. | Better suited for pure 5 V systems with legacy TTL fanout requirements; not recommended for mixed-voltage or low-VCC designs. | Choose only if interfacing exclusively with 5 V TTL logic and requiring tighter VIH/VIL margins. |
Compared with SN74AC273N, CD74AC273EG4 offers identical functionality and performance but reflects TI's specific orderable variant with G4 suffix indicating green (lead-free) finish. Against CD74ACT273E, CD74AC273EG4 provides broader voltage flexibility and lower static current, making it preferable for energy-constrained or multi-rail systems.
Availability
CD74AC273EG4 is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and legacy system repair requiring stable component supply and long-term obsolescence mitigation.
Supply support for CD74AC273EG4 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 90 years of innovation in high-reliability components.
The CD74AC273EG4 belongs to TI's 74AC logic family, designed for high-speed, low-power digital control in industrial, automotive, and aerospace applications where wide supply range and extended temperature operation are essential.
FAQ
What is the maximum clock frequency supported by CD74AC273EG4?
The CD74AC273EG4 supports a maximum clock frequency of 114 MHz at VCC = 5 V and TA = 25°C, dropping to 100 MHz at the full –55°C to +125°C operating range. This is derived from the specified 4.4 ns minimum clock pulse width and 12.3 ns max propagation delay under worst-case conditions, ensuring reliable edge-triggered operation in high-speed control logic.
Does CD74AC273EG4 require external pull-up or pull-down resistors on its inputs?
No, CD74AC273EG4 does not require external pull-up or pull-down resistors on its inputs. Its CMOS inputs have high impedance and defined VIH/VIL thresholds across the full 1.5–5.5 V supply range. However, unused inputs must be tied to VCC or GND per TI layout guidelines to prevent floating states and undefined operation.
Can CD74AC273EG4 drive a 50 Ω transmission line directly?
Yes, CD74AC273EG4 can drive a 50 Ω transmission line directly. Its ±24 mA output drive capability is explicitly verified for 50 Ω line termination at 85°C, as confirmed in the Electrical Characteristics table footnote (2), making it suitable for point-to-point high-speed interconnects without external line drivers.
What is the function of the !MR pin on CD74AC273EG4?
The !MR (Master Reset) pin on CD74AC273EG4 is an asynchronous, active-low input that forces all eight Q outputs low regardless of clock state. It operates independently of the CP signal, enabling immediate system-wide reset during fault conditions or power-up sequencing without waiting for a clock edge.
Is CD74AC273EG4 RoHS compliant and lead-free?
Yes, CD74AC273EG4 is RoHS compliant and lead-free. The "G4" suffix in the part number denotes TI's green packaging standard, confirmed in the Packaging Information table where CD74AC273E (base part) and CD74AC273EG4 share NIPDAU lead finish and RoHS "Yes" status for the PDIP (N) package.
CD74AC273EG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 100 MHz
- Max Propagation Delay @ V, Max CL:
- 13.5ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 1.5V ~ 5.5V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 10 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
CD74AC273EG4 FAQ
1.How can I place an order for CD74AC273EG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74AC273EG4 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 CD74AC273EG4 reliable?
The price and inventory of CD74AC273EG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74AC273EG4 is usually 5 days.
3.What payment methods are accepted for CD74AC273EG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74AC273EG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74AC273EG4?
CD74AC273EG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74AC273EG4 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 CD74AC273EG4?
For technical support, including CD74AC273EG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74AC273EG4 requirements.
6.How does Aetrix verify that CD74AC273EG4 is sourced from the original manufacturer or authorized distributors?
All CD74AC273EG4 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 CD74AC273EG4 meets industry standards.
7.What is the process for return or replacement of CD74AC273EG4?
All CD74AC273EG4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74AC273EG4, 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 CD74AC273EG4 part is unused and in its original packaging.
Return procedure for CD74AC273EG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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