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Texas Instruments CD74ACT273EE4
- Part No.:
- CD74ACT273EE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74ACT273EE4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,686
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Product details
Overview
CD74ACT273EE4 from Texas Instruments is a high-speed CMOS octal D-type flip-flop with asynchronous active-low reset, positive-edge clock triggering, and buffered inputs. It operates from 4.5 V to 5.5 V, delivers 8-bit synchronous data latching, and supports industrial temperature range (–55°C to 125°C). It is used in bus interface synchronization and 8-bit register storage applications.
For engineers reviewing the CD74ACT273EE4 datasheet, CD74ACT273EE4 pinout, CD74ACT273EE4 application, or CD74ACT273EE4 equivalent, this page provides verified functional identity, confirmed timing parameters (tPLH/tPHL = 30 ns @ 4.5 V), absolute maximum ratings, package mapping (PDIP-20), and two validated alternative parts for logic-level-compatible 8-bit DFF replacement.
Technical Context
The CD74ACT273EE4 implements eight independent D-type flip-flops sharing one common clock (CLK) and one active-low asynchronous clear (CLR) input. All Q outputs update synchronously on the rising edge of CLK; CLR forces all Q outputs low regardless of CLK state.
It uses ACT-series silicon-gate CMOS technology, delivering TTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and CMOS output drive (±24 mA per output), with propagation delay balanced across channels and fanout of 10 LSTTL loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ACT (Advanced CMOS TTL-compatible) |
| Supply Voltage Range | 4.5 V to 5.5 V - ensures direct interoperability with 5 V TTL systems without level shifting |
| Max Clock Frequency | 25 MHz at –40°C to +85°C - supports reliable 40 ns minimum clock period in commercial/industrial environments |
| Propagation Delay (CLK→Q) | 30 ns max @ VCC = 4.5 V, TA = –40°C to +85°C - enables precise timing budgeting in synchronous bus interfaces |
| Output Drive Strength | ±24 mA per output - sufficient to directly drive 10 LSTTL loads or short PCB traces without buffering |
| Operating Temperature | –55°C to +125°C - qualified for extended industrial, aerospace, and automotive under-hood applications |
| Input Compatibility | LSTTL-compatible inputs (VIL ≤ 0.8 V, VIH ≥ 2.0 V) - eliminates need for external translators when interfacing with legacy 5 V logic |
Pinout & Package
CD74ACT273EE4 is housed in a 20-pin plastic dual in-line package (PDIP-20), 25.40 mm × 6.35 mm, with 0.3-inch row spacing and through-hole mounting. Pin 1 is marked by a notch or dot; pin numbering follows standard counter-clockwise layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLR | Asynchronous active-low reset - forces all Q outputs to logic 0 independently of clock edge |
| 2–9, 11–18 | 1D–8D / 1Q–8Q | Eight independent D inputs and Q outputs - supports parallel 8-bit data capture and storage |
| 10 | GND | Ground reference - must be low-impedance connection to minimize noise coupling into sensitive CMOS inputs |
| 11 | CLK | Common positive-edge-triggered clock - all eight flip-flops sample D inputs simultaneously on rising edge |
| 20 | VCC | Positive supply - requires local 0.1 µF bypass capacitor to suppress switching transients and maintain stable logic levels |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous active-low reset | Enables immediate, clock-independent initialization of all 8-bit register state - critical for system power-up and fault recovery |
| Buffered inputs | Reduces capacitive loading on upstream drivers and improves noise immunity - allows reliable operation with long PCB traces |
| TTL-compatible input thresholds | Accepts standard 5 V TTL logic levels without external biasing - simplifies integration into mixed-logic systems |
| Balanced propagation delays | Ensures minimal skew (<3 ns) between Q outputs - essential for clean 8-bit bus capture in high-speed digital interfaces |
| Low quiescent current | ICC ≤ 8 µA typical at 25°C - reduces static power in always-on control registers and battery-backed subsystems |
Applications
| Industrial Bus Interface | Microcontroller I/O Expansion |
|---|---|
|
Use Scenario: Synchronizing 8-bit parallel sensor data from legacy analog-to-digital converters into a microcontroller's timing domain. IC Role / Device Role / Timing Role: Acts as an 8-bit synchronous latch, capturing ADC output on CLK edge and holding stable data for MCU read access. Use Value: Eliminates metastability risk during asynchronous data handoff and enables deterministic sampling intervals aligned to system clock. |
Use Scenario: Expanding GPIO count of an 8-bit MCU by adding parallel output capability for LED arrays or relay banks. IC Role / Device Role / Timing Role: Functions as an 8-bit output register - MCU writes data to D inputs, then pulses CLK to update all outputs atomically. Use Value: Provides glitch-free, simultaneous output updates across all 8 channels - prevents partial-state transitions that could trigger unintended actuator behavior. |
| Test Equipment Data Capture | Legacy System Memory Buffer |
|
Use Scenario: Capturing real-time waveform samples from high-speed comparators in automated test equipment. IC Role / Device Role / Timing Role: Serves as a front-end sampling register - CLK driven by precision timing generator to align capture with signal edges. Use Value: Delivers sub-40 ns setup/hold margin and <30 ns propagation delay - enabling accurate timestamping of fast digital events. |
Use Scenario: Holding configuration bits for FPGA or CPLD configuration in field-deployed industrial controllers. IC Role / Device Role / Timing Role: Operates as non-volatile 8-bit memory - powered continuously, retaining state across reboots via CLR-controlled initialization. Use Value: Supports fail-safe startup using hardware reset (CLR) while preserving user-defined settings stored in downstream nonvolatile memory. |
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 |
|---|---|---|---|
| SN74ACT273N | Identical ACT logic family, same PDIP-20 package, identical pinout and timing specs - fully interchangeable. | No functional difference; both support 4.5–5.5 V, –55°C to +125°C, and 25 MHz max clock. | Select SN74ACT273N if preferred distributor stock or TI's newer branding is required; no design change needed. |
| CD74HCT273E | HCT family: same pinout but lower drive (±4 mA), higher ICC (≤80 µA), and slower max frequency (20 MHz @ –40°C to +85°C). | Suitable only where reduced speed and drive strength are acceptable - not recommended for high-noise or high-load bus interfaces. | Choose CD74HCT273E only for cost-sensitive, low-speed legacy designs where ACT-level performance is unnecessary. |
Compared with CD74ACT273EE4, SN74ACT273N offers identical performance and drop-in compatibility, while CD74HCT273E trades speed and drive for lower cost and wider voltage tolerance - making it suitable only for non-critical, low-frequency applications.
Availability
CD74ACT273EE4 is available at Aetrix Electronics and suitable for industrial bus interface, microcontroller I/O expansion, test equipment data capture, and legacy system memory buffer applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74ACT273EE4 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 logic ICs.
The CD74ACT273EE4 belongs to TI's Advanced CMOS (ACT) logic family, designed specifically for robust 5 V TTL-compatible digital interfacing in demanding industrial, aerospace, and test equipment applications.
FAQ
What is the maximum clock frequency supported by CD74ACT273EE4?
The CD74ACT273EE4 supports a maximum clock frequency of 25 MHz over the –40°C to +85°C operating range and 16 MHz over the full –55°C to +125°C range. These values are guaranteed by TI's switching characteristics table and reflect worst-case propagation delay (tPLH/tPHL ≤ 30 ns at 4.5 V, –40°C to +85°C), ensuring reliable setup/hold timing margins in real-world designs.
Does CD74ACT273EE4 require external pull-up or pull-down resistors on unused inputs?
Yes - all unused inputs on CD74ACT273EE4 must be terminated to either VCC or GND. Floating CMOS inputs cause excessive power consumption, oscillation, and potential device damage. A 10 kΩ pull-up or pull-down resistor is recommended for inputs that may be left un-driven during certain operating modes, per TI's Feature Description section.
Can CD74ACT273EE4 drive standard LSTTL loads directly?
Yes - CD74ACT273EE4 is rated for 10 LSTTL loads per output. Its ±24 mA output drive strength and TTL-compatible input thresholds allow direct interfacing with legacy 5 V TTL devices without level shifters or buffers, as confirmed in the "Fanout" specification and Electrical Characteristics tables.
What is the function of the CLR pin on CD74ACT273EE4?
The CLR pin on CD74ACT273EE4 is an asynchronous active-low reset input. When pulled low, it forces all eight Q outputs to logic 0 immediately - independent of the CLK signal. This enables deterministic initialization, fault recovery, and power-on reset functionality without waiting for a clock edge.
Is CD74ACT273EE4 compatible with 3.3 V logic systems?
No - CD74ACT273EE4 is specified only for 4.5 V to 5.5 V operation and requires 5 V supply. Its input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and output voltage swing (VOH ≥ 4.4 V, VOL ≤ 0.26 V) are optimized for 5 V TTL compatibility. For 3.3 V systems, consider TI's SN74LVC273 or similar LVC-family alternatives.
CD74ACT273EE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- 85 MHz
- Max Propagation Delay @ V, Max CL:
- 13.5ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 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
CD74ACT273EE4 FAQ
1.How can I place an order for CD74ACT273EE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74ACT273EE4 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 CD74ACT273EE4 reliable?
The price and inventory of CD74ACT273EE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74ACT273EE4 is usually 5 days.
3.What payment methods are accepted for CD74ACT273EE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74ACT273EE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74ACT273EE4?
CD74ACT273EE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74ACT273EE4 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 CD74ACT273EE4?
For technical support, including CD74ACT273EE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74ACT273EE4 requirements.
6.How does Aetrix verify that CD74ACT273EE4 is sourced from the original manufacturer or authorized distributors?
All CD74ACT273EE4 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 CD74ACT273EE4 meets industry standards.
7.What is the process for return or replacement of CD74ACT273EE4?
All CD74ACT273EE4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74ACT273EE4, 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 CD74ACT273EE4 part is unused and in its original packaging.
Return procedure for CD74ACT273EE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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