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Texas Instruments SN74ACT74DE4
- Part No.:
- SN74ACT74DE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74ACT74DE4.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,512
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Product details
Overview
SN74ACT74DE4 from Texas Instruments is a dual positive-edge-triggered D-type flip-flop IC used for synchronous data storage and clocked logic control in digital systems. It operates from 4.5V to 5.5V, supports TTL-voltage-compatible inputs, delivers ≤10.5ns propagation delay at 5V, and features independent preset (PRE) and clear (CLR) inputs per channel with complementary Q and Q̅ outputs.
For engineers reviewing the SN74ACT74DE4 datasheet, SN74ACT74DE4 pinout, SN74ACT74DE4 application, or SN74ACT74DE4 equivalent, key selection criteria include its 14-pin PDIP package, dual-channel edge-triggered behavior, guaranteed 85MHz maximum clock frequency, and compatibility with 5V TTL/CMOS logic families in industrial control and test equipment designs.
Technical Context
The SN74ACT74DE4 implements two independent D-type flip-flops, each triggered on the rising edge of CLK while PRE and CLR are high. Its logic function follows standard D-flip-flop behavior: data at D is latched to Q on CLK↑ when both PRE and CLR are inactive (high), with asynchronous low-active PRE and CLR overriding clocked operation.
It uses advanced bipolar-CMOS (ACT) technology to achieve TTL-level input thresholds (VIH = 2V, VIL = 0.8V) while driving CMOS loads, supporting fan-out of ≥24 LSTTL loads. The device maintains defined output states across –40°C to +85°C and exhibits low power dissipation (ICC ≤ 20µA at 5.5V, 25°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5V–5.5V - Ensures robust operation across standard 5V supply tolerances in industrial environments. |
| Max Propagation Delay | 10.5ns at 5V - Enables reliable timing in high-speed digital circuits up to 85MHz clock frequency. |
| Input Voltage Compatibility | TTL-level (VIH = 2V, VIL = 0.8V) - Directly interfaces with legacy 5V TTL logic without level-shifting. |
| Output Drive Strength | ±24mA - Sufficient to drive multiple LSTTL loads or moderate capacitive bus lines. |
| Operating Temperature | –40°C to +85°C - Qualified for extended-temperature industrial applications. |
| Power Dissipation | 45pF typical Cpd - Predictable dynamic power consumption for thermal design at 1MHz switching. |
Pinout & Package
The SN74ACT74DE4 is supplied in a 14-pin plastic dual in-line package (PDIP, N package), body size 19.3mm × 6.35mm, with through-hole mounting and industry-standard pin spacing (0.1" pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CLR | Channel 1 Clear Input | Asynchronous active-low reset - forces Q₁ = 0, Q̅₁ = 1 regardless of clock or data state. |
| 2 D₁ | Channel 1 Data Input | Primary synchronous data source - value latched to Q₁ on next CLK↑ if PRE₁ and CLR₁ are high. |
| 3 CLK₁ | Channel 1 Clock Input | Rising-edge sensitive trigger - initiates sampling of D₁ only when PRE₁ and CLR₁ are inactive (high). |
| 4 PRE₁ | Channel 1 Preset Input | Asynchronous active-low set - forces Q₁ = 1, Q̅₁ = 0 independently of clock or data. |
| 5 Q₁ | Channel 1 True Output | Non-inverted registered output - reflects latched D₁ value after CLK↑ under normal operation. |
| 6 Q̅₁ | Channel 1 Complement Output | Inverted registered output - always opposite Q₁; useful for feedback or differential signaling. |
| 7 GND | Ground Reference | Common return path for all internal circuitry and I/O - must be low-impedance for noise immunity. |
| 8 Q̅₂ | Channel 2 Complement Output | Inverted registered output for second flip-flop - electrically isolated from Channel 1 except shared VCC/GND. |
| 9 Q₂ | Channel 2 True Output | Non-inverted registered output for second flip-flop - enables dual-bit storage in single package. |
| 10 PRE₂ | Channel 2 Preset Input | Asynchronous active-low set for Channel 2 - independent control of Q₂/Q̅₂ without affecting Channel 1. |
| 11 CLK₂ | Channel 2 Clock Input | Rising-edge sensitive trigger for Channel 2 - allows independent clocking or common clock with Channel 1. |
| 12 D₂ | Channel 2 Data Input | Primary synchronous data source for Channel 2 - supports independent or mirrored data paths. |
| 13 CLR₂ | Channel 2 Clear Input | Asynchronous active-low reset for Channel 2 - provides per-channel reset capability. |
| 14 VCC | Positive Supply | +4.5V to +5.5V power rail - requires local 0.1µF bypass capacitor near pin for stable high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent D-type flip-flops | Enables compact 2-bit synchronous storage or pipeline stages without external gating or routing. |
| Positive-edge clock triggering | Eliminates metastability concerns from asynchronous sampling; aligns with standard synchronous design practices. |
| Asynchronous PRE/CLR per channel | Supports immediate initialization or fault recovery in real-time control loops without waiting for clock edges. |
| TTL-compatible input thresholds | Interoperates directly with legacy 5V TTL logic families (e.g., 74LS, 74F) without interface buffers. |
| Complementary Q and Q̅ outputs | Provides both true and inverted outputs per channel - simplifies feedback, enable logic, and bus driving. |
Applications
| Industrial Control Logic | Digital Test Equipment |
|---|---|
Use Scenario: Synchronizing sensor readouts and actuator commands in PLC I/O modules. IC Role / Device Role / Timing Role: Dual-channel register holding sampled analog-to-digital converter outputs and generating timed control pulses. Use Value: Precise edge-aligned capture ensures deterministic timing between input sampling and output assertion within 10.5ns window. | Use Scenario: Generating precise stimulus patterns and capturing response waveforms in automated test fixtures. IC Role / Device Role / Timing Role: Clock-domain crossing buffer and pattern sequencer element in digital pattern generators. Use Value: Guaranteed 85MHz max clock rate supports high-speed digital vector generation with sub-11ns setup/hold margins. |
| Legacy System Interface | Power-Up State Initialization |
Use Scenario: Bridging modern microcontrollers to legacy 5V TTL peripherals such as displays or encoders. IC Role / Device Role / Timing Role: Level-tolerant data latch enabling clean handshake between mixed-voltage subsystems. Use Value: TTL-compatible inputs accept 2V–5V logic highs, eliminating need for discrete level shifters in retrofit designs. | Use Scenario: Establishing known initial states for downstream logic during system reset sequences. IC Role / Device Role / Timing Role: Asynchronous preset/clear controller asserting default values before main clock stabilizes. Use Value: Independent PRE/CLR pins per channel allow selective initialization of functional blocks without global reset propagation delays. |
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 die, identical electrical specs and pinout; differs only in RoHS-compliant lead finish (NIPDAU vs. SNPB in DE4). | No functional difference - suitable for new designs requiring RoHS compliance; DE4 remains valid for legacy repair or non-RoHS environments. | Select SN74ACT74N for new production targeting RoHS; retain SN74ACT74DE4 for exact form-fit-function replacement in existing assemblies. |
| SN74HC74N | Higher propagation delay (21ns typ), lower drive strength (±4mA), wider VCC range (2–6V), but same PDIP-14 package and pinout. | Better suited for low-power, battery-operated, or multi-voltage systems where speed <40MHz suffices and 5V TTL compatibility is not required. | Choose SN74HC74N only when power efficiency or wide supply range outweighs need for 85MHz operation and TTL input compatibility. |
Compared with SN74ACT74N and SN74HC74N, the SN74ACT74DE4 uniquely combines 5V TTL input compatibility, 10.5ns propagation, and ±24mA drive in a legacy PDIP package - making it irreplaceable in high-speed industrial control upgrades requiring direct drop-in compatibility with existing 74ACT logic families.
Availability
SN74ACT74DE4 is available at Aetrix Electronics and suitable for industrial control logic, digital test equipment, legacy system interface, and power-up state initialization requiring stable component supply and long-term obsolescence management.
Supply support for SN74ACT74DE4 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 industrial, automotive, and communications markets.
The SN74ACT74DE4 belongs to TI's 74ACT logic family - designed specifically for high-speed, low-noise 5V digital systems requiring TTL compatibility, robust noise immunity, and guaranteed AC/DC performance across industrial temperature ranges.
FAQ
What is the maximum clock frequency supported by the SN74ACT74DE4?
The SN74ACT74DE4 supports a maximum clock frequency of 85MHz under recommended operating conditions (VCC = 4.5V–5.5V, TA = –40°C to +85°C). This rating is derived from its guaranteed maximum propagation delay of 10.5ns at 5V and validated timing margins in the official TI datasheet SCAS520J. Operation beyond 85MHz may violate setup/hold timing and result in metastability or incorrect latching.
Does the SN74ACT74DE4 require external pull-up or pull-down resistors on unused inputs?
Yes - all unused inputs on the SN74ACT74DE4 must be tied to a defined logic level (VCC or GND) to prevent floating states that cause excessive current draw, noise susceptibility, or undefined outputs. TI's layout guidelines explicitly prohibit leaving PRE, CLR, D, or CLK pins unconnected. Unused outputs may remain floating unless driving a bus, in which case termination should follow signal integrity requirements.
Is the SN74ACT74DE4 pin-compatible with other 74xx74 variants like the SN74LS74 or SN74HC74?
The SN74ACT74DE4 shares the same 14-pin PDIP footprint and pinout as SN74LS74 and SN74HC74, but is not functionally interchangeable without design review. Key differences include TTL-compatible input thresholds (2V/0.8V), higher drive strength (±24mA), and faster speed (10.5ns vs. 21ns for HC, 25ns for LS). Substitution requires verification of voltage levels, loading, and timing margins in the target circuit.
What is the purpose of the complementary Q and Q̅ outputs on the SN74ACT74DE4?
The complementary Q and Q̅ outputs on each channel of the SN74ACT74DE4 provide logically inverted versions of the same stored bit, enabling direct implementation of toggle functions, differential signaling, bus drivers with enable control, and feedback paths without external inverters. This reduces component count and propagation delay in synchronous state machines and clocked data paths.
Can the SN74ACT74DE4 operate reliably at 3.3V supply voltage?
No - the SN74ACT74DE4 is specified only for 4.5V to 5.5V VCC operation per its absolute maximum and recommended operating conditions. At 3.3V, input thresholds (VIH = 2V, VIL = 0.8V) become marginal, output drive collapses, and timing parameters are not guaranteed. For 3.3V systems, TI recommends the SN74LVC74A or SN74AUP1G74, which are designed for lower-voltage operation.
SN74ACT74DE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Set(Preset) and Reset
- Type:
- D-Type
- Output Type:
- Complementary
- Number of Elements:
- 2
- Number of Bits per Element:
- 1
- Clock Frequency:
- 210 MHz
- Max Propagation Delay @ V, Max CL:
- 11ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 2 µA
- Input Capacitance:
- 3 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74ACT74DE4 FAQ
1.How can I place an order for SN74ACT74DE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT74DE4 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 SN74ACT74DE4 reliable?
The price and inventory of SN74ACT74DE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT74DE4 is usually 5 days.
3.What payment methods are accepted for SN74ACT74DE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT74DE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT74DE4?
SN74ACT74DE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT74DE4 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 SN74ACT74DE4?
For technical support, including SN74ACT74DE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT74DE4 requirements.
6.How does Aetrix verify that SN74ACT74DE4 is sourced from the original manufacturer or authorized distributors?
All SN74ACT74DE4 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 SN74ACT74DE4 meets industry standards.
7.What is the process for return or replacement of SN74ACT74DE4?
All SN74ACT74DE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT74DE4, 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 SN74ACT74DE4 part is unused and in its original packaging.
Return procedure for SN74ACT74DE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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