CD74AC273EG4 Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
The CD74AC273EG4 is an octal D-type flip-flop with asynchronous master reset from Texas Instruments AC logic family, providing 8 bits of edge-triggered data storage in a single 20-pin DIP package. Operates from 2V to 6V supply with high-speed CMOS performance and low power consumption. Available from stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 20
- Lifecycle
- ACTIVE
- Datasheet
- CD74AC273EG4 Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 8-bit (octal) D-type flip-flop with common clock and asynchronous active-low master reset for simultaneous 8-bit data register operation
- AC logic family provides high-speed CMOS performance with 2V to 6V supply range and TTL-compatible input thresholds
- Non-inverting outputs with common clock enable synchronous parallel data capture for microprocessor bus interfacing
- 20-pin DIP package with through-hole pins ideal for prototyping, breadboarding, and legacy PCB replacement applications
Applications
The CD74AC273EG4 is used in digital data registers, address latches, and pipeline storage elements in microprocessor-based systems and digital signal processing circuits. Its 8-bit parallel clocked operation makes it ideal for capturing bus data, buffering output ports, and storing control words in embedded controllers and programmable logic applications. The asynchronous reset feature allows system initialization regardless of clock state, making it valuable in power-on reset and fault recovery circuits.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for CD74AC273EG4:
D Flip-Flop, AC Series, 1-Func, Positive Edge Triggered, 8-Bit, True Output, CMOS, PDIP20
Frequently Asked Questions
What is the function of the CD74AC273EG4?
The CD74AC273EG4 is an octal (8-bit) positive edge-triggered D-type flip-flop with a common active-low asynchronous master reset (MR). On the rising edge of the clock (CP), all 8 D inputs are sampled and transferred to the Q outputs simultaneously. When MR is pulled low, all 8 Q outputs are immediately reset to logic 0 regardless of the clock state, providing system-wide initialization capability.
What supply voltage does the CD74AC273EG4 support?
The CD74AC273EG4 operates from a supply voltage range of 2V to 6V. The AC (Advanced CMOS) family uses CMOS-compatible inputs with thresholds at approximately 50% of VCC, and outputs swing rail-to-rail for maximum noise margins. At 5V operation, typical propagation delay is around 5-7ns, making it significantly faster than older 74HC series devices while consuming lower power than TTL equivalents.
What package does the CD74AC273EG4 use and what does E suffix mean?
The CD74AC273EG4 is packaged in a 20-pin PDIP (Plastic Dual In-line Package) with 0.3-inch row spacing, as indicated by the E suffix. The G4 suffix denotes RoHS-compliant Green packaging. The DIP package allows through-hole mounting and is fully compatible with standard IC sockets and breadboards, making it practical for prototyping and repair of older equipment using legacy DIP board designs.
What is the difference between CD74AC273 and CD74ACT273?
The CD74AC273 uses CMOS-compatible input thresholds referenced to VCC (approximately VCC/2), while the CD74ACT273 uses fixed TTL-compatible thresholds (VIH min 2.0V, VIL max 0.8V at 5V operation). Use the AC version for pure CMOS-to-CMOS interfacing, especially at 3.3V supply, and the ACT version when the flip-flop inputs are driven by TTL outputs or older bipolar logic in 5V systems.
Can the CD74AC273EG4 be used as an 8-bit parallel output register?
Yes, the CD74AC273EG4 is commonly used as an 8-bit parallel output register or port latch. Data presented on the 8 D inputs is captured on each rising clock edge and held stable on the Q outputs until the next clock edge or a master reset event. This makes it useful for microcontroller GPIO expansion, printer port interfaces, LED display drivers, and stepper motor control where multiple outputs need to be updated simultaneously.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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