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Texas Instruments SN74ACT74DRG4
- Part No.:
- SN74ACT74DRG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74ACT74DRG4.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,176
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Product details
Overview
SN74ACT74DRG4 from Texas Instruments is a dual positive-edge-triggered D-type flip-flop IC operating at 4.5V–5.5V VCC, with 10.5ns max propagation delay at 5V, TTL-voltage-compatible inputs, and independent preset/clear per channel. It serves as a synchronous storage element in digital control logic, clock-domain synchronization, and state-machine sequencing in industrial PLCs and communication interface buffers.
For engineers reviewing the SN74ACT74DRG4 datasheet, SN74ACT74DRG4 pinout, SN74ACT74DRG4 application, or SN74ACT74DRG4 equivalent, key selection criteria include its 14-pin SOIC (D) package, guaranteed 85MHz maximum clock frequency, dual-channel independent asynchronous control, and compatibility with 5V TTL-level signal domains.
Technical Context
The SN74ACT74DRG4 implements two identical, electrically isolated D-type flip-flop channels, each with separate active-low preset (PRE) and clear (CLR) inputs, enabling independent initialization without affecting the other channel. Its positive-edge-triggered clock input (CLK) transfers data from D to Q on the rising edge, while maintaining output state during hold time (1ns minimum) after CLK.
Each channel features complementary outputs (Q and Q̅), supports fan-out of ≥20 TTL loads, and operates across –40°C to +85°C ambient temperature. Input voltage tolerance extends to 5.5V regardless of VCC, allowing mixed-voltage interfacing with legacy 5V systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5V to 5.5V - Ensures stable operation across standard 5V supply rails with ±10% tolerance. |
| Max Propagation Delay (tpd) | 10.5ns at 5V - Enables reliable timing in high-speed digital logic up to 85MHz clock frequency. |
| Input Voltage Tolerance | Up to 5.5V - Allows direct connection to 5V TTL outputs without level-shifting circuitry. |
| Output Drive Strength | ±24mA - Sufficient to drive multiple TTL inputs or moderate capacitive loads (≤50pF). |
| Setup/Hold Time | tsu = 3.5ns, th = 1ns - Defines minimum data stability window before/after CLK edge for deterministic sampling. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded control and automation applications. |
| Power Dissipation Capacitance | 45pF - Predicts dynamic power consumption under 1MHz switching with 50pF load. |
Pinout & Package
SN74ACT74DRG4 is packaged in a 14-pin SOIC (D) body measuring 8.65mm × 6mm, with 3.9mm body width excluding leads. The package is RoHS-compliant, lead-finished with NiPdAu, and rated MSL-1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CLR | Channel 1 Clear Input | Active-low asynchronous reset; forces Q₁ = L, Q̅₁ = H regardless of clock or data state. |
| 2 D₁ | Channel 1 Data Input | Primary synchronous data source sampled on rising CLK₁ edge when PRE₁ and CLR₁ are inactive. |
| 3 CLK₁ | Channel 1 Clock Input | Positive-edge-triggered control signal; initiates data transfer from D₁ to Q₁/Q̅₁. |
| 4 PRE₁ | Channel 1 Preset Input | Active-low asynchronous set; forces Q₁ = H, Q̅₁ = L independently of clock or data. |
| 5 Q₁ | Channel 1 True Output | Non-inverted registered output reflecting D₁ state after CLK₁ rising edge. |
| 6 Q̅₁ | Channel 1 Complementary Output | Inverted copy of Q₁; enables differential signaling or logic inversion without external gates. |
| 7 GND | Ground Reference | Common return path for all internal circuits and output drivers; must be low-impedance. |
| 8 Q̅₂ | Channel 2 Complementary Output | Inverted output of second flip-flop; electrically isolated from Channel 1 signals. |
| 9 Q₂ | Channel 2 True Output | Non-inverted registered output of second flip-flop; shares no internal nodes with Channel 1. |
| 10 PRE₂ | Channel 2 Preset Input | Independent active-low set for Channel 2; does not affect Channel 1 operation. |
| 11 CLK₂ | Channel 2 Clock Input | Dedicated rising-edge trigger for Channel 2; may be driven separately from CLK₁. |
| 12 D₂ | Channel 2 Data Input | Independent synchronous data input for second flip-flop; no coupling to D₁. |
| 13 CLR₂ | Channel 2 Clear Input | Independent active-low reset for Channel 2; fully decoupled from Channel 1 controls. |
| 14 VCC | Positive Supply | 5V nominal power rail; requires local 0.1µF bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent flip-flops | Two fully isolated D-type storage elements sharing only VCC and GND; enables compact dual-bit register design. |
| TTL-compatible inputs | Accepts standard 5V TTL logic levels (VIL ≤ 0.8V, VIH ≥ 2.0V) without external biasing or level translation. |
| Asynchronous preset/clear per channel | Permits immediate initialization or reset of either channel without waiting for clock edge or affecting the other channel. |
| Low propagation delay | 10.5ns max tPLH/tPHL at 5V ensures minimal timing skew in critical path logic and pipeline stages. |
| High noise immunity | Input hysteresis and 0.4V noise margin (VIH – VIL) reduce susceptibility to ground bounce and crosstalk in dense PCB layouts. |
Applications
| Industrial Control Logic | Digital Communication Interface |
|---|---|
Use Scenario: Synchronizing asynchronous sensor interrupts into a microcontroller's clock domain within a programmable logic controller. IC Role / Device Role / Timing Role: Dual-channel metastability-hardened synchronizer, using one flip-flop per stage to suppress setup/hold violations. Use Value: Reduces interrupt loss probability by >99.9% compared to single-stage sampling, leveraging independent PRE/CLR for manual recovery. |
Use Scenario: Generating matched enable/disable strobes for RS-485 transceiver direction control in half-duplex UART links. IC Role / Device Role / Timing Role: Edge-aligned dual-output generator where Q₁ enables driver and Q̅₁ disables receiver with zero skew. Use Value: Eliminates bus contention by guaranteeing simultaneous, glitch-free transition between transmit/receive states. |
| State-Machine Sequencing | Test Equipment Pattern Generation |
Use Scenario: Implementing a 2-bit binary counter in automated test equipment sequencers requiring precise step advancement. IC Role / Device Role / Timing Role: Core storage element in Moore-type finite-state machine, with CLK driving state transitions and PRE/CLR enabling reset to known initial state. Use Value: Provides deterministic startup and error recovery via hardware reset, avoiding software-dependent initialization delays. |
Use Scenario: Generating fixed-phase clock-divided waveforms (e.g., quadrature clocks) for ATE pin electronics calibration. IC Role / Device Role / Timing Role: Cascaded D-flip-flop pair producing 2× phase-shifted outputs (Q₁, Q₂) from common CLK with sub-nanosecond skew. Use Value: Achieves <100ps inter-channel skew at 85MHz, meeting IEEE 1149.1 boundary-scan timing compliance requirements. |
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 |
|---|---|---|---|
| SN74ACT74DR | Identical electrical specs and pinout; differs only in RoHS marking (G4 suffix denotes green packaging). | No functional difference; both qualified for industrial temperature range (–40°C to +85°C). | Select SN74ACT74DRG4 when RoHS-compliant, lead-free assembly and traceable green material documentation are required. |
| 74ACT74M | Same logic function and AC/DC specs, but in 14-pin PDIP (N) package with larger footprint (19.3mm × 9.4mm) and higher thermal resistance (RθJA = 80°C/W vs. 119.9°C/W). | Suitable for prototyping or through-hole assembly; less suitable for space-constrained or thermally demanding PCBs. | Choose 74ACT74M only for hand-soldered evaluation or legacy through-hole designs where SOIC reflow is unavailable. |
Compared with SN74ACT74DR and 74ACT74M, the SN74ACT74DRG4 offers identical timing and drive performance in a smaller, surface-mount SOIC package with certified lead-free finish-making it optimal for volume production of industrial control boards requiring IPC Class 3 compliance and thermal efficiency.
Availability
SN74ACT74DRG4 is available at Aetrix Electronics and suitable for industrial control logic, digital communication interface design, and state-machine sequencing requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for SN74ACT74DRG4 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 electronic components.
The SN74ACT74DRG4 belongs to TI's ACT (Advanced CMOS Technology) logic family, engineered for high-speed 5V digital systems requiring TTL compatibility, low power, and robust noise immunity in industrial and communications infrastructure.
FAQ
What is the maximum clock frequency supported by the SN74ACT74DRG4?
The SN74ACT74DRG4 supports a maximum clock frequency of 85MHz under recommended operating conditions (VCC = 4.5V–5.5V, TA = –40°C to +85°C). This value is derived from its 10.5ns maximum propagation delay and verified timing margins in the official TI datasheet SCAS520J. Exceeding this frequency risks setup/hold violations and metastability in the SN74ACT74DRG4 outputs.
Does the SN74ACT74DRG4 require external pull-up or pull-down resistors on its preset and clear inputs?
No, the SN74ACT74DRG4 does not require external pull-up or pull-down resistors on PRE or CLR inputs when actively driven, as these are standard CMOS inputs with defined logic thresholds. However, if left unconnected during operation, they must be tied to VCC (to disable) or GND (to assert) to prevent floating states that could cause unintended resets or sets in the SN74ACT74DRG4 flip-flop channels.
Can the SN74ACT74DRG4 operate reliably with a 3.3V supply?
No, the SN74ACT74DRG4 is not specified for 3.3V operation. Its absolute minimum VCC is 4.5V, and its input thresholds (VIH ≥ 2.0V, VIL ≤ 0.8V) and output drive characteristics are optimized for 5V TTL compatibility. Using 3.3V will result in undefined logic states and failure to meet timing or drive specifications for the SN74ACT74DRG4.
What is the purpose of the complementary Q and Q̅ outputs on the SN74ACT74DRG4?
The complementary Q and Q̅ outputs on the SN74ACT74DRG4 provide logically inverted copies of the same stored bit, enabling direct implementation of differential signaling, XOR/XNOR logic, or clocked inverters without external gates. This reduces component count and propagation delay in applications like Johnson counters or bus arbitration logic using the SN74ACT74DRG4.
How does the SN74ACT74DRG4 handle simultaneous assertion of PRE and CLR on the same channel?
When both PRE and CLR are asserted low on the same channel of the SN74ACT74DRG4, the device enters a nonstable state (Q = Q̅ = H), which is explicitly documented as transient and non-persistent. Upon release of either control signal, the output resolves to the state dictated by the remaining active control-ensuring predictable recovery without latch-up or undefined behavior in the SN74ACT74DRG4.
SN74ACT74DRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
SN74ACT74DRG4 FAQ
1.How can I place an order for SN74ACT74DRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT74DRG4 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 SN74ACT74DRG4 reliable?
The price and inventory of SN74ACT74DRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT74DRG4 is usually 5 days.
3.What payment methods are accepted for SN74ACT74DRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT74DRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT74DRG4?
SN74ACT74DRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT74DRG4 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 SN74ACT74DRG4?
For technical support, including SN74ACT74DRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT74DRG4 requirements.
6.How does Aetrix verify that SN74ACT74DRG4 is sourced from the original manufacturer or authorized distributors?
All SN74ACT74DRG4 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 SN74ACT74DRG4 meets industry standards.
7.What is the process for return or replacement of SN74ACT74DRG4?
All SN74ACT74DRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT74DRG4, 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 SN74ACT74DRG4 part is unused and in its original packaging.
Return procedure for SN74ACT74DRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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