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Texas Instruments CD74ACT273EG4
- Part No.:
- CD74ACT273EG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74ACT273EG4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20DIP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
CD74ACT273EG4 from Texas Instruments is an octal D-type flip-flop with asynchronous master reset, designed for high-speed digital logic interfacing in industrial and embedded control systems. It features 5V operation (4.5–5.5 V), 12.3 ns typical propagation delay at VCC = 5 V, ±24 mA output drive, and TTL-compatible inputs. It operates across –55°C to +125°C and supports 50 Ω transmission-line driving.
For engineers reviewing the CD74ACT273EG4 datasheet, CD74ACT273EG4 pinout, CD74ACT273EG4 application, or CD74ACT273EG4 equivalent, key selection criteria include its ACT-series speed-power balance, robust ESD immunity (±2000 V HBM), wide temperature range, and compatibility with legacy TTL and modern CMOS logic families.
Technical Context
The CD74ACT273EG4 implements eight edge-triggered D flip-flops sharing a common rising-edge clock (CP) and active-low asynchronous master reset (!MR). Its architecture uses advanced CMOS process technology with SCR-latchup resistance, enabling reliable operation in noisy environments without external protection circuitry.
All outputs respond synchronously to CP edges, while !MR forces Qn low independently of clock timing. Input thresholds are TTL-compatible (VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 4.5–5.5 V), and output drive strength supports fanout to 15 FAST™ ICs or direct 50 Ω line termination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures interoperability with standard 5 V TTL and mixed-voltage logic systems. |
| tPLH / tPHL (Typ) | 12.3 ns at VCC = 5 V, CL = 50 pF - Enables >85 MHz clock operation in synchronous data capture applications. |
| Output Drive | ±24 mA per pin - Sufficient to directly drive 50 Ω transmission lines or interface with multiple FAST™ loads without buffers. |
| Operating Temp | –55°C to +125°C - Qualified for extended-temperature industrial, automotive under-hood, and military-grade designs. |
| ESD Rating | ±2000 V HBM - Meets JEDEC JS-001 requirements for robust handling in manufacturing and field deployment. |
| Input Thresholds | VIH ≥ 2.0 V, VIL ≤ 0.8 V - Guarantees reliable recognition of TTL-level signals across full VCC and temperature range. |
| ICC (Quiescent) | ≤160 μA at –55°C to +125°C - Supports low-static-power system design without compromising speed or noise immunity. |
Pinout & Package
CD74ACT273EG4 is packaged in a 20-pin PDIP (Plastic Dual In-line Package) with body size 24.33 mm × 6.35 mm and standard 0.3-inch width. 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 regardless of clock state; critical for power-up initialization and fault recovery. |
| 2 Q0 | Output | Complementary data latch output for D0; synchronized to positive CP edge unless reset. |
| 3 D0 | Data input | Primary data source for Q0; sampled on rising CP edge and held until next valid edge or reset. |
| 4 D1 | Data input | Primary data source for Q1; shares same timing constraints and setup/hold requirements as D0. |
| 5 Q1 | Output | Complementary data latch output for D1; matches Q0 timing behavior and drive capability. |
| 6 Q2 | Output | Complementary data latch output for D2; maintains consistent propagation delay and load tolerance across all eight outputs. |
| 7 D2 | Data input | Primary data source for Q2; part of unified 8-bit parallel data path with shared clock and reset. |
| 8 D3 | Data input | Primary data source for Q3; enables byte-wide data registration in bus interface and control register applications. |
| 9 Q3 | Output | Complementary data latch output for D3; supports simultaneous 8-bit output assertion for address/data latching. |
| 10 GND | Ground reference | Common return path for all internal logic and I/O; must be low-impedance to maintain noise margin and timing integrity. |
| 11 CP | Clock input | Rising-edge-triggered control signal; all eight flip-flops sample Dn simultaneously on CP transition. |
| 12 Q4 | Output | Complementary data latch output for D4; identical electrical characteristics to Q0–Q3. |
| 13 D4 | Data input | Primary data source for Q4; completes first half of octal data path with matched trace-length routing requirements. |
| 14 D5 | Data input | Primary data source for Q5; supports full 8-bit parallel loading in microcontroller peripheral interfaces. |
| 15 Q5 | Output | Complementary data latch output for D5; maintains tight skew (<1 ns) between Q outputs for synchronous bus timing. |
| 16 Q6 | Output | Complementary data latch output for D6; enables deterministic hold time for downstream logic sampling. |
| 17 D6 | Data input | Primary data source for Q6; used in pipeline stages where data validity must be extended beyond one clock cycle. |
| 18 D7 | Data input | Primary data source for Q7; final bit of octal register; requires same PCB layout rules (length matching, decoupling) as D0–D6. |
| 19 Q7 | Output | Complementary data latch output for D7; provides full byte-wide output for status registers or display drivers. |
| 20 VCC | Power supply | +5 V 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 |
|---|---|
| SCR-latchup-resistant CMOS process | Prevents destructive latch-up under transient overvoltage or ESD events, eliminating need for external current-limiting resistors. |
| TTL-compatible input thresholds | Ensures seamless integration with legacy 5 V microcontrollers, FPGAs, and logic families without level-shifting circuitry. |
| ±24 mA output drive per pin | Directly drives 50 Ω transmission lines or up to 15 FAST™ IC inputs, reducing component count in high-speed bus interfaces. |
| Balanced propagation delays | Minimizes inter-output skew (<1 ns), enabling reliable byte-wide data capture in real-time control and instrumentation systems. |
| Wide operating temperature range | –55°C to +125°C rating supports deployment in harsh environments including motor drives, power supplies, and avionics. |
Applications
| Industrial PLC I/O Expansion | Automotive Engine Control Unit (ECU) Interface |
|---|---|
|
Use Scenario: Latching sensor data from analog-to-digital converters before transfer to microcontroller via parallel bus. IC Role / Device Role / Timing Role: Octal D flip-flop providing synchronized, glitch-free registration of 8-bit status or measurement values on rising clock edge. Use Value: Eliminates metastability risk during high-noise engine bay operation and ensures deterministic timing alignment across all eight channels. |
Use Scenario: Capturing diagnostic codes from CAN transceiver status pins for real-time fault logging. IC Role / Device Role / Timing Role: Parallel data register holding 8-bit error flags synchronized to ECU main clock domain. Use Value: Provides noise-immune, temperature-stable storage of critical fault indicators without requiring additional isolation or buffering. |
| Test Equipment Digital Pattern Generator | Legacy System Bus Interface Adapter |
|
Use Scenario: Generating precise, repeatable digital stimulus waveforms for IC functional testing. IC Role / Device Role / Timing Role: High-speed data latch feeding programmable logic or FPGA-based waveform sequencer. Use Value: 12.3 ns propagation delay enables sub-10 ns timing resolution, supporting test vectors for 100+ MHz digital devices. |
Use Scenario: Bridging Z80 or 8085 CPU address/data buses to modern peripherals using 5 V tolerant logic. IC Role / Device Role / Timing Role: Byte-wide transparent latch isolating legacy processor bus from external memory or I/O devices. Use Value: TTL-compatible inputs and strong outputs ensure reliable handshaking and bus contention avoidance in retro-computing upgrades. |
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 |
|---|---|---|---|
| SN74ACT273N | Same ACT-family logic, identical pinout and AC/DC specs; manufactured by TI with different packaging and RoHS compliance labeling. | No functional difference; suitable for drop-in replacement where PDIP-20 mechanical fit and legacy marking are required. | Select SN74ACT273N when sourcing from TI's current production line with updated MSL-1 tape-and-reel packaging. |
| CD74AC273E | AC-series variant: wider VCC range (1.5–5.5 V), slower max speed (100 MHz vs 97 MHz), lower drive (±24 mA same, but reduced noise immunity at 3 V). | Preferred for multi-supply systems or battery-powered designs needing 3.3 V operation; not recommended for strict 5 V TTL-only environments. | Choose CD74AC273E only if dual-voltage support or lower static power at partial VCC is required; otherwise CD74ACT273EG4 offers superior 5 V performance. |
Compared with SN74ACT273N, CD74ACT273EG4 offers identical functionality and timing but differs in packaging marking and historical orderable suffix; compared with CD74AC273E, it delivers higher noise immunity, tighter timing margins, and guaranteed 5 V TTL compatibility-making it optimal for industrial control and automotive interface designs.
Availability
CD74ACT273EG4 is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and test equipment requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CD74ACT273EG4 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 for industrial, automotive, and communications markets.
The CD74ACT273EG4 belongs to TI's legacy high-speed CMOS logic family, engineered specifically for robust, pin-compatible replacements of bipolar TTL devices while delivering lower power and enhanced noise immunity in demanding environments.
FAQ
What is the maximum clock frequency supported by CD74ACT273EG4?
The CD74ACT273EG4 supports a maximum clock frequency of 97 MHz at VCC = 5 V and TA = –40°C to +85°C, and 85 MHz across the full –55°C to +125°C operating range. This is derived from its 5.3 ns minimum CP pulse width and 12.3 ns typical propagation delay, ensuring reliable setup/hold timing margins in synchronous systems using the CD74ACT273EG4.
Does CD74ACT273EG4 require external pull-up or pull-down resistors on unused inputs?
Yes - all unused inputs of the CD74ACT273EG4 must be tied to a defined logic level (VCC or GND) to prevent floating states that cause increased power consumption, noise susceptibility, or erratic output behavior. The CD74ACT273EG4 does not include internal input biasing, so external termination is mandatory per TI layout guidelines.
Can CD74ACT273EG4 drive 50 Ω transmission lines directly?
Yes - the CD74ACT273EG4 is explicitly characterized to drive 50 Ω transmission lines at 85°C, verified by its ±24 mA output drive capability and specified VOL/VOL performance under 50 Ω load conditions. This eliminates the need for external line drivers in high-speed digital interconnects using the CD74ACT273EG4.
Is CD74ACT273EG4 compatible with 3.3 V logic systems?
No - the CD74ACT273EG4 is an ACT-series device rated for 4.5 V to 5.5 V operation only. Its input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and output voltage levels are optimized for 5 V TTL compatibility. For 3.3 V systems, consider the AC-series CD74AC273E or level-shifting solutions instead of the CD74ACT273EG4.
What is the thermal resistance (θJA) of CD74ACT273EG4 in its PDIP package?
The CD74ACT273EG4 in the 20-pin PDIP (N) package has a junction-to-ambient thermal resistance (θJA) of 69 °C/W, as specified in TI's thermal information table. This value assumes standard JEDEC 2S2P board conditions and informs thermal design for continuous operation at maximum ambient temperatures using the CD74ACT273EG4.
CD74ACT273EG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- 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:
- 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
CD74ACT273EG4 FAQ
1.How can I place an order for CD74ACT273EG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74ACT273EG4 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 CD74ACT273EG4 reliable?
The price and inventory of CD74ACT273EG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74ACT273EG4 is usually 5 days.
3.What payment methods are accepted for CD74ACT273EG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74ACT273EG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74ACT273EG4?
CD74ACT273EG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74ACT273EG4 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 CD74ACT273EG4?
For technical support, including CD74ACT273EG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74ACT273EG4 requirements.
6.How does Aetrix verify that CD74ACT273EG4 is sourced from the original manufacturer or authorized distributors?
All CD74ACT273EG4 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 CD74ACT273EG4 meets industry standards.
7.What is the process for return or replacement of CD74ACT273EG4?
All CD74ACT273EG4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74ACT273EG4, 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 CD74ACT273EG4 part is unused and in its original packaging.
Return procedure for CD74ACT273EG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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