SN74BCT574 - Octal D-Type Flip-Flop with 3-State Outputs | TI
MPN: SN74BCT574 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.25 | $1.25 |
| 10 | $1.12 | $11.20 |
| 100 | $0.95 | $95.00 |
| 500 | $0.82 | $410.00 |
| 1,000 | $0.74 | $740.00 |
Drop-in alternatives for SN74BCT574 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
SN74ACT574
β Drop-Inπ Reference alternative (not in catalog)
SN74ABT574
β Drop-Inπ Reference alternative (not in catalog)
74ABT574AN
β Drop-Inπ Reference alternative (not in catalog)
74F574
β Drop-Inπ Reference alternative (not in catalog)
SN74LS574
β Drop-Inπ Reference alternative (not in catalog)
SN74BCT574 Maximum Ratings & Electrical Characteristics
| Function | Octal D-Type Edge-Triggered Flip-Flop with 3-State Outputs |
| Number of Bits | 8 |
| Operating Voltage Range | 4.5 V to 5.5 V |
| Output Type | 3-State |
| Technology | BiCMOS |
| Package Options | DB (SSOP), DW (SOIC), N (PDIP), NS (SOP) |
| Propagation Delay | [DATA_NEEDED: propagation delay] |
| Maximum Clock Frequency | [DATA_NEEDED: max clock frequency] |
| Output Current | [DATA_NEEDED: output current] |
| Input Type | Standard CMOS |
| Operating Temperature Range | [DATA_NEEDED: operating temperature range] |
| Mounting Type | Surface Mount or Through-Hole |
| RoHS Status | Compliant |
| Number of Pins | 20 |
| Logic Family | BCT |
SN74BCT574 Pin Configuration
| Pin 1 | OE β Output enable (active low) |
| Pin 2 | 1Q β Output 1 |
| Pin 3 | 1D β Data input 1 |
| Pin 4 | 2D β Data input 2 |
| Pin 5 | 2Q β Output 2 |
| Pin 6 | 3Q β Output 3 |
| Pin 7 | 3D β Data input 3 |
| Pin 8 | 4D β Data input 4 |
| Pin 9 | 4Q β Output 4 |
| Pin 10 | GND β Ground |
| Pin 11 | CLK β Clock input (rising edge triggered) |
| Pin 12 | 5Q β Output 5 |
| Pin 13 | 5D β Data input 5 |
| Pin 14 | 6D β Data input 6 |
| Pin 15 | 6Q β Output 6 |
| Pin 16 | 7Q β Output 7 |
| Pin 17 | 7D β Data input 7 |
| Pin 18 | 8D β Data input 8 |
| Pin 19 | 8Q β Output 8 |
| Pin 20 | VCC β Power supply (4.5V to 5.5V) |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
SN74BCT574 is suitable for 6 applications: Buffer Registers, I/O Ports, Bidirectional Bus Drivers, Working Registers, Data Acquisition Systems, Industrial Control.
Buffer Registers
The SN74BCT574 is ideal for buffer registers in microprocessor systems, where it latches data from a data bus and drives it to output devices. Its 3-state outputs allow multiple registers to share a common bus without contention. The device's high drive capability ensures reliable signal integrity even with long traces and high capacitance loads. With a 4.5V to 5.5V operating range, it integrates seamlessly into standard 5V logic systems. The edge-triggered clocking ensures data is captured precisely, making it suitable for synchronous data transfer.
Recommended
I/O Ports
In microcontroller and FPGA systems, the SN74BCT574 is used to implement parallel I/O ports. The 3-state outputs allow the port to be tri-stated when not driving, enabling bidirectional communication. The device's ability to drive low-impedance loads makes it suitable for connecting to LEDs, relays, or other peripherals. The wide operating voltage range ensures compatibility with 5V logic, and the BiCMOS design minimizes power consumption, which is critical in battery-powered applications. The edge-triggered flip-flop ensures that output changes occur only on clock edges, providing predictable timing.
Recommended
Bidirectional Bus Drivers
The SN74BCT574 is well-suited for bidirectional bus drivers in computer and communication systems. Its 3-state outputs allow the device to be disconnected from the bus when not active, preventing data corruption. The high output drive capability ensures that signals can be transmitted over long bus lines with minimal degradation. The device's BiCMOS technology provides a balance of speed and power efficiency, making it ideal for high-speed data buses. The edge-triggered design ensures that data is latched synchronously, which is essential for reliable bus communication.
Recommended
Working Registers
The SN74BCT574 is used as a working register in CPUs and DSPs to store temporary data during processing. Its 8-bit width and edge-triggered clocking make it ideal for storing data words in synchronous systems. The 3-state outputs allow the register to be read by multiple subsystems without interference. The device's high speed and low power consumption are beneficial in high-performance computing applications. The wide operating voltage range ensures compatibility with various logic families, and the compact SOIC package saves board space.
Recommended
Data Acquisition Systems
In data acquisition systems, the SN74BCT574 is used to latch digital data from ADCs or sensors before processing. Its 3-state outputs allow multiple data sources to share a common bus, simplifying system architecture. The device's high drive capability ensures that data is transmitted reliably to the processing unit. The edge-triggered clocking ensures that data is captured at precise sampling instants, which is critical for accurate measurements. The wide operating voltage range and low power consumption make it suitable for portable and industrial data acquisition equipment.
Recommended
Industrial Control
The SN74BCT574 is used in industrial control systems for latching control signals and driving output actuators. Its robust design and wide operating voltage range make it suitable for harsh industrial environments. The 3-state outputs allow multiple controllers to share a common bus, enabling distributed control architectures. The device's high output drive capability ensures that signals can drive relays, solenoids, and other loads directly. The edge-triggered clocking provides deterministic timing, which is essential for safety-critical control applications.
Recommended
Recommended Products Summary
Engineering reference data for SN74BCT574 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SN74ACT574 | SN74ABT574 | 74ABT574AN | 74F574 | SN74LS574 |
|---|---|---|---|---|---|---|
| Package | SOIC-20 (DW) | SOIC-20 (DW) | SOIC-20 (DW) | SOIC-20 (SOT163-1) | SOIC-20 (SOT163-1) | SOIC-20 (DW) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | NXP Semiconductors | NXP Semiconductors | Texas Instruments |
| Technology | BiCMOS | CMOS | BiCMOS | BiCMOS | Bipolar | Bipolar |
| Operating Voltage Range | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.75V to 5.25V |
| Output Type | 3-State | 3-State | 3-State | 3-State | 3-State | 3-State |
| Number of Bits | 8 | 8 | 8 | 8 | 8 | 8 |
| Propagation Delay | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Max Clock Frequency | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- BiCMOS technology reduces power consumption while maintaining high drive capability (vs SN74ACT574)
- Wide operating voltage range of 4.5V to 5.5V (vs SN74LS574)
- Available in multiple package options including SSOP, SOIC, PDIP, and SOP (vs 74F574)
Design Notes
The SN74BCT574 operates from a 4.5V to 5.5V supply. Ensure a stable 5V supply with adequate decoupling. Place a 0.1uF ceramic capacitor close to the VCC pin and a 10uF bulk capacitor nearby to handle transient currents. The BiCMOS design reduces ICCZ, but power consumption increases with clock frequency and output loading. Calculate total power dissipation as VCC * ICC + sum of output currents * voltage drop to ensure thermal limits are not exceeded.
For high-speed operation, keep traces short and use controlled impedance if driving long bus lines. Place the device close to the bus connector to minimize trace length. Use a solid ground plane to reduce noise and ensure signal integrity. Decouple the VCC pin with a 0.1uF ceramic capacitor placed as close as possible to the pin, and connect the GND pin directly to the ground plane with a low-impedance via.
Ensure the OE pin is not left floating; tie it to ground to enable outputs or to VCC to disable them. Floating inputs can cause excessive power consumption and unpredictable behavior. Also, avoid bus contention by ensuring only one device drives the bus at a time. When using the device in a bidirectional bus, implement proper bus arbitration or use external buffers to prevent simultaneous drive.
Compliance Information
RoHS compliant per TI product page. Not AEC-Q100 qualified. Lead-free per TI's environmental data.
