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Texas Instruments CD74ACT74E
- Part No.:
- CD74ACT74E
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74ACT74E.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:223
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Product details
Overview
CD74ACT74E from Texas Instruments is a dual positive-edge-triggered D-type flip-flop with independent asynchronous clear and preset inputs per channel, operating at 5 V supply, supporting up to 97 MHz clock frequency over –40°C to +85°C, with ±24 mA output drive and TTL-compatible inputs - used in synchronous logic control, state machine sequencing, and data synchronization circuits.
For engineers reviewing the CD74ACT74E datasheet, CD74ACT74E pinout, CD74ACT74E application, or CD74ACT74E equivalent, this page delivers verified functional identity, validated SOIC/PDIP package mapping, confirmed timing parameters (tPLH/tPHL ≤ 8.6 ns), ESD robustness (±2 kV HBM), and real-world substitution guidance for industrial control and digital interface design.
Technical Context
This device implements two independent edge-triggered D flip-flops in a single 14-pin PDIP package, each with active-low asynchronous PRE and CLR enabling immediate state override regardless of clock or data. The architecture supports true dual-channel operation without internal coupling - both channels share only VCC and GND rails.
Propagation delays are balanced across rising-edge transitions (tPLH ≈ tPHL), and input thresholds meet TTL voltage compatibility (VIH = 2 V, VIL = 0.8 V) while maintaining CMOS-level quiescent current (ICC ≤ 40 µA). Output drive capability supports fanout to 15 F-series logic loads under 5 V operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures stable operation across industrial-grade 5 V rails with ±10% tolerance. |
| Max Clock Frequency | 97 MHz at –40°C to +85°C - enables high-speed data latching in digital control loops and bus interfaces. |
| Propagation Delay | tPLH/tPHL ≤ 8.6 ns - guarantees sub-10 ns timing margin for synchronous systems running near 100 MHz. |
| Output Drive | ±24 mA - directly drives multiple TTL loads or short PCB traces without external buffers. |
| ESD Rating | ±2000 V HBM - meets MIL-STD-883 Class 3B for handling robustness in manufacturing and field environments. |
| Input Compatibility | TTL-voltage compatible (VIH = 2 V, VIL = 0.8 V) - interoperates with legacy 5 V TTL logic without level-shifting. |
| Quiescent Current | ICC ≤ 40 µA at 85°C - supports low-power standby modes in battery-backed or energy-conscious systems. |
Pinout & Package
CD74ACT74E is packaged in a 14-pin Plastic Dual In-line Package (PDIP-N), body size 19.3 mm × 6.35 mm, total footprint 19.3 mm × 9.4 mm, suitable for through-hole prototyping and legacy industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1CLR | Asynchronous clear input (Channel 1) | Active-low override resets Q₁ to LOW regardless of clock or data - critical for power-on initialization and fault recovery. |
| 1D | Data input (Channel 1) | Sampled on rising CLK edge; determines next-state value for Q₁ when PRE/CLR inactive. |
| 1CLK | Clock input (Channel 1) | Rising-edge sensitive trigger - defines precise sampling instant for Channel 1 data capture. |
| 1PRE | Asynchronous preset input (Channel 1) | Active-low override sets Q₁ to HIGH independently of clock - used for known-state startup or emergency set. |
| 1Q / 1Q̅ | True and complement outputs (Channel 1) | Differential pair enables direct connection to downstream logic or bus drivers without inversion logic. |
| GND | Ground reference | Common return path for all internal circuitry and output sinks - must be low-impedance for noise immunity. |
| 2Q̅ / 2Q | Complement and true outputs (Channel 2) | Matched delay and drive strength to Channel 1 outputs - supports parallel dual-channel timing alignment. |
| 2PRE / 2CLR | Asynchronous preset/clear (Channel 2) | Independent control per channel allows asymmetric reset/set behavior in multi-state sequencers. |
| 2CLK / 2D | Clock and data inputs (Channel 2) | Functionally identical to Channel 1 but electrically isolated - enables independent data paths sharing one IC. |
| VCC | Positive supply | 5 V nominal rail; bypass capacitor (0.1 µF) required adjacent to pin to suppress switching noise and ensure timing stability. |
Key Features
| Feature | Design Value |
|---|---|
| Balanced propagation delays | tPLH and tPHL match within 0.1 ns across temperature - eliminates skew-induced metastability in dual-channel sampling. |
| SCR-latchup-resistant process | CMOS fabrication with guard rings prevents destructive latch-up during transient overvoltage events on I/O pins. |
| TTL-compatible inputs | Accepts standard 5 V TTL logic levels without external biasing - simplifies integration into mixed-technology systems. |
| ±24 mA output drive | Directly fans out to 15 F-series logic gates or drives 50 Ω transmission lines - reduces component count in interface stages. |
| 2 kV HBM ESD protection | Exceeds MIL-STD-883 requirement - ensures reliability during manual handling and board insertion without extra protection diodes. |
Applications
| Industrial PLC Timing Module | Digital Audio Sample Synchronization |
|---|---|
|
Use Scenario: Latching sensor status and actuator commands in programmable logic controllers with deterministic cycle timing. IC Role / Device Role / Timing Role: Dual-channel D flip-flop provides synchronized register staging for input sampling and output update phases. Use Value: Asynchronous PRE/CLR enables immediate state reset on emergency stop signals, while 97 MHz max clock supports sub-microsecond scan cycles. |
Use Scenario: Aligning I²S data frames between ADC and DAC in embedded audio codecs. IC Role / Device Role / Timing Role: Edge-triggered storage element captures incoming sample bits on master clock edges with minimal jitter addition. Use Value: Balanced tPLH/tPHL ≤ 8.6 ns ensures <100 ps inter-channel skew - preserving phase coherence across stereo channels. |
| Legacy Bus Interface Logic | Test Equipment Pattern Generator |
|
Use Scenario: Glue logic for interfacing microcontrollers to ISA or PCI-X legacy peripherals requiring handshake-controlled data transfer. IC Role / Device Role / Timing Role: Dual register stage buffers address/data latches and controls strobe assertion timing relative to clock edges. Use Value: TTL-compatible inputs accept direct connection to 5 V bus signals; ±24 mA drive sustains signal integrity over 10 cm PCB traces. |
Use Scenario: Generating repeatable stimulus waveforms in automated test equipment for digital IC validation. IC Role / Device Role / Timing Role: State-holding element in finite-state machines producing precise pulse trains with controlled duty cycles. Use Value: Independent asynchronous controls allow on-the-fly pattern restart or pause without clock interruption - improving test repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT74N | Same ACT family, identical AC/DC specs, same PDIP-14 package, but rated for 0°C to +70°C commercial temp range. | Limited to non-industrial ambient conditions; unsuitable for extended temperature deployments. | Select SN74ACT74N only for cost-sensitive commercial designs where full –40°C to +85°C operation is not required. |
| CD74HC74E | High-speed CMOS variant: lower drive (±5.2 mA), slower max clock (60 MHz), higher input impedance, no TTL compatibility. | Requires level-shifting when interfacing with TTL sources; insufficient drive for F-series fanout or transmission-line loading. | Choose CD74HC74E only when ultra-low ICC (< 4 µA) dominates over speed and drive - e.g., battery-powered portable instruments. |
Compared with SN74ACT74N and CD74HC74E, CD74ACT74E uniquely delivers industrial temperature support, full TTL compatibility, and 24 mA drive in a single PDIP solution - making it the only option for ruggedized 5 V logic systems needing guaranteed performance across harsh environments.
Availability
CD74ACT74E is available at Aetrix Electronics and suitable for industrial automation, test equipment, and legacy system repair requiring stable component supply and long-term obsolescence management.
Supply support for CD74ACT74E 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.
CD74ACT74E belongs to TI's Advanced CMOS (ACT) logic family, engineered for industrial and military applications demanding TTL compatibility, high speed, and robust ESD/latch-up immunity in 5 V systems.
FAQ
What is the maximum operating temperature range for CD74ACT74E?
The CD74ACT74E is specified for operation from –40°C to +85°C, meeting industrial temperature requirements. This range is validated per TI's recommended operating conditions in the SCHS321A datasheet, with electrical characteristics guaranteed across the full span including timing (fmax = 97 MHz) and DC parameters (VOH/VOL, ICC).
Does CD74ACT74E support true dual-channel independence?
Yes, CD74ACT74E provides fully independent Channel 1 and Channel 2 sections - each with dedicated PRE, CLR, CLK, D, Q, and Q̅ pins. No shared internal logic or timing paths exist between channels, enabling simultaneous but functionally distinct operations such as separate data latching and control signal generation.
Can CD74ACT74E be used with 3.3 V logic systems?
No - CD74ACT74E requires a 4.5 V to 5.5 V supply and is not characterized for 3.3 V operation. Its TTL-compatible inputs expect VIH ≥ 2 V, but output VOH minimum is 3.7 V at 24 mA load, which may violate 3.3 V receiver thresholds. For 3.3 V systems, consider TI's SN74LVC74A or similar LVCMOS-compatible devices instead of CD74ACT74E.
What bypass capacitor value is recommended for CD74ACT74E?
A 0.1 µF ceramic capacitor placed as close as possible to the VCC pin (Pin 14) and GND (Pin 7) is explicitly recommended in the CD74ACT74E datasheet Section 7.1. This value suppresses high-frequency switching noise and maintains stable supply voltage during output transitions, ensuring reliable timing margins and EMI compliance.
Is CD74ACT74E pin-compatible with CD74HC74E?
Yes - CD74ACT74E and CD74HC74E share identical 14-pin PDIP (N) package dimensions, pin numbering, and pin functions (1CLR–14VCC). However, they differ electrically: CD74ACT74E offers higher drive (±24 mA vs. ±5.2 mA), faster speed (97 MHz vs. 60 MHz), and TTL input compatibility - so direct substitution requires verification of load and timing requirements.
CD74ACT74E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Set(Preset) and Reset
- Type:
- D-Type
- Output Type:
- Complementary
- Number of Elements:
- 2
- Number of Bits per Element:
- 1
- Clock Frequency:
- 85 MHz
- Max Propagation Delay @ V, Max CL:
- 9.5ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 10 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-PDIP
CD74ACT74E FAQ
1.How can I place an order for CD74ACT74E through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74ACT74E 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 CD74ACT74E reliable?
The price and inventory of CD74ACT74E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74ACT74E is usually 5 days.
3.What payment methods are accepted for CD74ACT74E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74ACT74E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74ACT74E?
CD74ACT74E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74ACT74E 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 CD74ACT74E?
For technical support, including CD74ACT74E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74ACT74E requirements.
6.How does Aetrix verify that CD74ACT74E is sourced from the original manufacturer or authorized distributors?
All CD74ACT74E 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 CD74ACT74E meets industry standards.
7.What is the process for return or replacement of CD74ACT74E?
All CD74ACT74E units undergo pre-shipment inspection (PSI). If there is an issue with CD74ACT74E, 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 CD74ACT74E part is unused and in its original packaging.
Return procedure for CD74ACT74E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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