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Texas Instruments SN74ACT574NG4
- Part No.:
- SN74ACT574NG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ACT574NG4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,401
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Product details
Overview
SN74ACT574NG4 from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state outputs, designed for bus interface and data latching in 5V digital systems. It operates from 4.5V to 5.5V VCC, features 9ns max propagation delay at 5V, TTL-compatible inputs, and supports rising-edge clock triggering across all eight channels.
For engineers reviewing the SN74ACT574NG4 datasheet, SN74ACT574NG4 pinout, SN74ACT574NG4 application, or SN74ACT574NG4 equivalent, this device is selected for high-speed bidirectional bus buffering, I/O port expansion, and register-based data capture where low skew, 3-state drive capability, and robust noise immunity are required.
Technical Context
The SN74ACT574NG4 implements eight independent D-type flip-flops synchronized to the rising edge of a common CLK input, with asynchronous output control via an active-low OE terminal. Its architecture enables simultaneous data capture and conditional bus release without affecting internal state retention.
Each channel delivers ±24mA output drive at 5V, supports 50pF capacitive loads per output, and maintains defined logic states under TTL-level input thresholds (VIL ≤ 0.8V, VIH ≥ 2V). The device remains functional across –40°C to +85°C and exhibits 40pF typical power-dissipation capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5V to 5.5V - Ensures compatibility with standard 5V TTL/CMOS logic rails and tolerance against supply ripple. |
| Max tpd | 9ns at 5V - Enables reliable operation up to 85MHz clock frequency in synchronous bus systems. |
| Output Drive | ±24mA per Q output - Sufficient to directly drive 50pF loads or terminate stubs on medium-length PCB traces. |
| Input Compatibility | TTL-voltage compatible - Accepts 0.8V/2.0V thresholds, eliminating level-shifting when interfacing legacy TTL devices. |
| 3-State Enable | Active-low OE with 1.5ns typical tPHL - Allows precise timing-controlled bus release without glitches during data transitions. |
| Operating Temp | –40°C to +85°C - Qualified for industrial-grade embedded control, instrumentation, and communications equipment. |
| ESD Rating | ±2000V HBM - Meets JEDEC JS-001 requirements for robust handling in automated assembly environments. |
Pinout & Package
SN74ACT574NG4 is supplied in a 20-pin PDIP (N) package with 24.33mm × 9.4mm body size and through-hole mounting. Pin 1 is located at the top-left corner adjacent to the notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low output enable | Controls all eight Q outputs simultaneously; asserts high-impedance state when high, enabling bus sharing. |
| 2–9 (D1–D8) | Data inputs | Asynchronous inputs latched on CLK rising edge; accept TTL-compatible voltage levels up to 5.5V. |
| 10 (GND) | Ground reference | Primary return path for logic and output current; requires local 0.1µF bypass capacitor. |
| 11 (CLK) | Clock input | Rising-edge sensitive; minimum pulse width 3ns ensures reliable sampling across temperature and voltage extremes. |
| 12–19 (Q8–Q1) | 3-state outputs | Drive bus lines actively (low/high) or disconnect (high-Z); support hot-swap and multi-driver arbitration. |
| 20 (VCC) | Positive supply | Must be decoupled locally; supplies internal logic and output drivers; tolerates 4.5–5.5V range. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-triggered latching | Rising-edge CLK synchronizes all eight D inputs simultaneously, minimizing inter-channel skew (<1ns). |
| 3-state bus interface | OE-controlled high-impedance outputs eliminate need for external bus transceivers or pull-up resistors. |
| TTL-compatible inputs | Accepts 0–5.5V input voltages and meets standard TTL thresholds, simplifying mixed-logic system integration. |
| Low propagation delay | 9ns max tpd at 5V enables use in 85MHz data paths without added pipeline stages. |
| Industrial temperature range | Specified from –40°C to +85°C with full electrical performance, supporting deployment in harsh environments. |
Applications
| Microcontroller I/O Expansion | Parallel Bus Interface |
|---|---|
|
Use Scenario: Expanding GPIO count of an MCU by adding parallel 8-bit input/output ports via address-decoded control. IC Role / Device Role / Timing Role: Acts as an output latch and input buffer, capturing data on CLK rising edge while OE isolates the bus during read cycles. Use Value: Eliminates need for discrete buffers or CPLDs; supports direct connection to 5V MCU buses with no level translation. |
Use Scenario: Interfacing a microprocessor data bus to peripheral devices such as ADCs, DACs, or memory-mapped peripherals. IC Role / Device Role / Timing Role: Functions as a bidirectional data register, holding write data until strobed and presenting read data on demand. Use Value: Provides clean, glitch-free bus isolation during direction changes; 24mA drive handles multiple TTL loads without fanout buffers. |
| Industrial Control Register | Digital Test Equipment Latch |
|
Use Scenario: Capturing sensor status bits or actuator command signals in programmable logic controllers (PLCs) and motor drives. IC Role / Device Role / Timing Role: Serves as a synchronized input capture register, sampling parallel status lines on system clock edges. Use Value: Ensures deterministic timing alignment across all 8 bits; high noise immunity prevents spurious state changes in electrically noisy factory environments. |
Use Scenario: Holding test pattern data in automated test equipment (ATE) before applying to device-under-test (DUT) pins. IC Role / Device Role / Timing Role: Operates as a precision timing-critical latch, freezing stimulus vectors with sub-10ns setup/hold margins. Use Value: 2.5ns min tsu and 1ns th guarantee accurate vector launch at 85MHz; 3-state outputs prevent back-driving during pattern updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT374N | Same ACT family, identical pinout and AC specs, but includes separate Q and Q̅ outputs per channel. | Required when complementary outputs are needed for differential signaling or inverted logic paths. | Select SN74ACT374N only if Q̅ outputs are used; otherwise SN74ACT574NG4 offers lower pin count and cost for single-ended bus use. |
| 74LCX574M | Lower VCC range (2.0–3.6V), higher speed (tpd = 5.5ns), but reduced drive (±24mA only at 3.3V). | Suitable for mixed-voltage 3.3V systems; not interoperable with 5V buses without level shifters. | Choose 74LCX574M for 3.3V-only designs requiring faster timing; avoid for 5V legacy interfaces due to voltage incompatibility. |
Compared with SN74ACT374N and 74LCX574M, the SN74ACT574NG4 uniquely balances 5V bus compatibility, industrial temperature rating, and minimal footprint in PDIP packaging-making it optimal for retrofitting and industrial control applications where voltage and timing constraints are fixed.
Availability
SN74ACT574NG4 is available at Aetrix Electronics and suitable for industrial control systems, test equipment design, and legacy 5V microcontroller interfacing requiring stable component supply and long-term obsolescence management.
Supply support for SN74ACT574NG4 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 SN74ACT574NG4 belongs to TI's advanced CMOS (ACT) logic family, engineered for high-speed, low-noise 5V digital interfacing in mission-critical industrial and instrumentation applications.
FAQ
What is the maximum clock frequency supported by the SN74ACT574NG4?
The SN74ACT574NG4 supports a maximum clock frequency of 85MHz under recommended operating conditions (VCC = 5V, TA = –40°C to +85°C). This is derived from its 9ns maximum propagation delay and verified timing parameters including 3ns minimum clock pulse width and 2.5ns setup time, ensuring reliable edge-triggered operation in high-speed bus applications.
Does the SN74ACT574NG4 require external pull-up resistors on the OE pin?
Yes - to ensure the outputs remain in high-impedance state during power-up or power-down, the OE pin of the SN74ACT574NG4 should be tied to VCC via a pull-up resistor. TI recommends a value determined by the driver's current-sinking capability; typical values range from 4.7kΩ to 10kΩ for robust noise immunity and fast disable timing.
Can the SN74ACT574NG4 interface directly with 3.3V logic devices?
No - the SN74ACT574NG4 is a 5V-only device with VCC range 4.5V–5.5V and TTL-compatible inputs rated for 0.8V/2.0V thresholds. While its inputs tolerate up to 5.5V, driving it from 3.3V logic may violate the 2.0V VIH minimum, risking unreliable high-level detection. Level translation is required for safe 3.3V-to-5V interfacing.
What thermal considerations apply to the SN74ACT574NG4 in continuous operation?
The SN74ACT574NG4 in PDIP (N) package has a junction-to-ambient thermal resistance (RθJA) of 69°C/W. At maximum load (all outputs switching at 85MHz), power dissipation remains below 100mW, resulting in <7°C junction rise above ambient. No heatsink is required, but proper PCB copper area and airflow should be maintained for sustained industrial operation.
Is the SN74ACT574NG4 pin-compatible with other 20-pin octal D flip-flops like the 74LS374?
Yes - the SN74ACT574NG4 shares identical pinout and function mapping with industry-standard 20-pin octal D flip-flops including the 74LS374 and 74HC574. Pin-for-pin compatibility extends to CLK, OE, D1–D8, Q1–Q8, VCC, and GND positions, enabling drop-in replacement in existing layouts while delivering superior speed, drive strength, and noise immunity.
SN74ACT574NG4 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:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 110 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):
- 4 µA
- Input Capacitance:
- 4.5 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74ACT574NG4 FAQ
1.How can I place an order for SN74ACT574NG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT574NG4 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 SN74ACT574NG4 reliable?
The price and inventory of SN74ACT574NG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT574NG4 is usually 5 days.
3.What payment methods are accepted for SN74ACT574NG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT574NG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT574NG4?
SN74ACT574NG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT574NG4 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 SN74ACT574NG4?
For technical support, including SN74ACT574NG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT574NG4 requirements.
6.How does Aetrix verify that SN74ACT574NG4 is sourced from the original manufacturer or authorized distributors?
All SN74ACT574NG4 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 SN74ACT574NG4 meets industry standards.
7.What is the process for return or replacement of SN74ACT574NG4?
All SN74ACT574NG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT574NG4, 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 SN74ACT574NG4 part is unused and in its original packaging.
Return procedure for SN74ACT574NG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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