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Texas Instruments SN74BCT574DW
- Part No.:
- SN74BCT574DW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74BCT574DW.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,234
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Product details
Overview
SN74BCT574DW from Texas Instruments is an octal transparent D-type flip-flop with 3-state outputs, designed for bus interface and data latching in TTL-compatible systems. It operates at 4.5 V to 5.5 V, supports 77 MHz clock frequency, delivers ±64 mA output drive, and features BiCMOS architecture for low ICCZ (4.9–8 mA) and high noise immunity.
For engineers reviewing the SN74BCT574DW datasheet, SN74BCT574DW pinout, SN74BCT574DW application, or SN74BCT574DW equivalent, this device serves as a high-drive, 3-state buffer register for bidirectional bus driving, I/O port expansion, and working register implementation in industrial control and legacy computing systems.
Technical Context
The SN74BCT574DW implements eight edge-triggered D-type flip-flops synchronized on the rising edge of CLK, capturing parallel D-input data and presenting it at Q-outputs. Its 3-state outputs are controlled independently by an active-low OE input that does not affect internal latch operation.
This BiCMOS device combines bipolar input stages for TTL-level compatibility and CMOS output drivers for high current sourcing/sinking (±64 mA), enabling direct connection to capacitive buses without external pull-ups. Thermal resistance is 58°C/W (DW package), supporting stable operation across 0°C to 70°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V TTL and mixed-voltage logic systems. |
| Max Clock Frequency | 77 MHz - Supports high-speed data capture in real-time control and communication interfaces. |
| Output Drive | ±64 mA - Drives heavy capacitive loads (e.g., >50 pF buses) without external buffers or termination. |
| Propagation Delay (tPLH/tPHL) | 2.2 ns to 10 ns - Enables tight timing margins in synchronous bus architectures with minimal skew. |
| 3-State Enable/Disable Time | tPZH = 1 ns, tPZL = 1.3 ns - Allows rapid bus arbitration and multi-master contention resolution. |
| Input Clamp Protection | −18 mA - Prevents damage from transient overvoltage or floating inputs during power sequencing. |
| ICCZ Quiescent Current | 4.9–8 mA - Reduces standby power in powered-but-idle bus-hold configurations. |
Pinout & Package
SN74BCT574DW uses a 20-pin SOIC (DW) package with 7.5 mm width, 12.83 mm length, and 2.65 mm max height, compliant with JEDEC MS-013 and RoHS (NIPDAU finish, MSL Level-1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Data Inputs (1D–8D) | Parallel asynchronous inputs latched on CLK↑; TTL-compatible thresholds (VIH = 2 V, VIL = 0.8 V). |
| 11, 13, 14, 15, 16, 17, 18, 19 | 3-State Outputs (1Q–8Q) | BiCMOS totem-pole outputs; high-impedance when OE = high, capable of ±64 mA drive. |
| 9 | Output Enable (OE) | Active-low control; places all Q-outputs in high-Z without affecting internal latch state or CLK/D operation. |
| 10 | GND | Signal reference ground; decoupling required near pin for noise-sensitive bus switching. |
| 20 | VCC | Positive supply (4.5–5.5 V); requires local 0.1 µF ceramic bypass capacitor. |
| 12 | CLK | Single-edge clock input; triggers simultaneous latching of all eight D inputs on rising transition. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS Process Technology | Combines TTL input compatibility with CMOS output drive strength, reducing ICCZ by >50% vs. pure bipolar equivalents. |
| Full Parallel Load Architecture | Enables simultaneous capture of 8-bit data on one clock edge-ideal for address/data bus registration. |
| Independent 3-State Control | OE pin disables outputs without disrupting internal latch state, allowing data retention during bus release. |
| ESD Robustness | 2000-V HBM, 200-V MM, 1000-V CDM protection ensures reliability in handling and board assembly environments. |
| Bus-Friendly Output Stage | High-current sinking (64 mA) and sourcing (15 mA) eliminate need for external bus drivers or pull-up resistors. |
Applications
| Industrial PLC Backplane Interface | Legacy Computer I/O Expansion |
|---|---|
Use Scenario: Interfacing microcontroller GPIOs to a 24 V-rated industrial backplane with long trace runs and high capacitance. IC Role / Device Role / Timing Role: Acts as a level-translating, high-drive bus latch between 5 V logic and noisy field-side peripherals. Use Value: Eliminates external bus transceivers and pull-up networks while maintaining signal integrity at 77 MHz burst rates. |
Use Scenario: Adding parallel I/O capability to an ISA-bus-based embedded controller running DOS-based firmware. IC Role / Device Role / Timing Role: Functions as an 8-bit bidirectional data port register with hardware-controlled tristate enable for shared bus arbitration. Use Value: Provides TTL-compatible timing and drive strength matching original IBM PC/AT design requirements. |
| Test Equipment Digital Pattern Generator | Automated Test Fixture Data Capture |
Use Scenario: Generating synchronized 8-bit stimulus patterns for IC functional testing under automated test equipment (ATE) control. IC Role / Device Role / Timing Role: Serves as a programmable pattern register clocked by ATE master clock; OE enables pattern hold during setup/hold windows. Use Value: Delivers sub-10 ns propagation delay and <1.3 ns disable time for precise timing alignment across multiple channels. |
Use Scenario: Capturing parallel sensor outputs (e.g., 8-channel ADC results) into a microcontroller's memory-mapped I/O space. IC Role / Device Role / Timing Role: Latches sampled data on system clock edge and presents it via 3-state outputs to a multiplexed data bus. Use Value: Enables zero-wait-state read access due to fast tPLH (2.2 ns typical) and eliminates bus contention via OE-controlled isolation. |
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 |
|---|---|---|---|
| SN74ACT574DW | CMOS process; lower ICC (1.5 µA typ), higher VIH (3.5 V min), 50 MHz max speed | Better for low-power, 3.3 V–5 V mixed-signal systems; unsuitable for legacy 5 V TTL bus loading | Choose if power efficiency and noise margin outweigh raw drive strength and speed. |
| 74LS574N | Bipolar TTL; 35 MHz max clock, ±24 mA drive, higher ICC (45 mA), no BiCMOS ICCZ reduction | Compatible with older LS-based designs but lacks bus-driving capability and ESD robustness | Select only for drop-in replacement in existing LS-only boards where speed and drive are secondary. |
Compared with SN74ACT574DW and 74LS574N, the SN74BCT574DW uniquely balances 77 MHz speed, ±64 mA drive, and BiCMOS quiescent current optimization-making it the preferred choice for high-fanout, noise-immune 5 V bus interfacing where both performance and robustness are critical.
Availability
SN74BCT574DW is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy computer I/O expansion, automated test fixture data capture, and digital pattern generation requiring stable component supply and long-term obsolescence management.
Supply support for SN74BCT574DW 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74BCT574DW belongs to TI's BCT (Bipolar-CMOS Transistor) logic family, engineered specifically for high-speed, high-drive 5 V bus interface applications where TTL compatibility, noise immunity, and low standby current are simultaneously required.
FAQ
What is the maximum clock frequency supported by SN74BCT574DW?
The SN74BCT574DW supports a maximum clock frequency of 77 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C). This value is guaranteed across the full commercial temperature range (0°C to 70°C) and reflects the device's optimized BiCMOS architecture for high-speed data capture in synchronous bus systems.
Does SN74BCT574DW require external pull-up resistors on its outputs?
No, SN74BCT574DW does not require external pull-up resistors on its outputs. Its BiCMOS output stage provides active high- and low-level drive (±64 mA), enabling direct connection to capacitive buses without passive termination-unlike open-collector or older TTL devices.
How does the OE pin behave during power-up or power-down sequences?
To ensure high-impedance outputs during power-up or power-down, the OE pin of SN74BCT574DW must be tied to VCC through a pull-up resistor. The minimum resistor value depends on the current-sinking capability of the driver, as specified in the TI datasheet SCBS074C.
Can SN74BCT574DW operate reliably at 4.5 V supply voltage?
Yes, SN74BCT574DW is fully specified to operate at 4.5 V supply voltage. Its recommended operating range is 4.5 V to 5.5 V, and all key parameters-including propagation delay, output drive, and setup/hold times-are guaranteed across this range per the SCBS074C datasheet.
What package type and dimensions does SN74BCT574DW use?
SN74BCT574DW uses a 20-pin SOIC (DW) package measuring 12.83 mm × 7.5 mm × 2.65 mm max height, with 1.27 mm lead pitch and NIPDAU lead finish. It complies with JEDEC MS-013 and carries MSL Level-1 rating for unlimited floor life at ≤30°C/60% RH.
SN74BCT574DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 77 MHz
- Max Propagation Delay @ V, Max CL:
- 8.6ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 15mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 8 mA
- Input Capacitance:
- 5.5 pF
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74BCT574DW FAQ
1.How can I place an order for SN74BCT574DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT574DW 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 SN74BCT574DW reliable?
The price and inventory of SN74BCT574DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT574DW is usually 5 days.
3.What payment methods are accepted for SN74BCT574DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74BCT574DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74BCT574DW?
SN74BCT574DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT574DW 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 SN74BCT574DW?
For technical support, including SN74BCT574DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT574DW requirements.
6.How does Aetrix verify that SN74BCT574DW is sourced from the original manufacturer or authorized distributors?
All SN74BCT574DW 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 SN74BCT574DW meets industry standards.
7.What is the process for return or replacement of SN74BCT574DW?
All SN74BCT574DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT574DW, 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 SN74BCT574DW part is unused and in its original packaging.
Return procedure for SN74BCT574DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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