SN74BCT574NSRE4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The SN74BCT574NSRE4 is an octal D-type edge-triggered flip-flop from Texas Instruments in the BCT logic family, operating at up to 77 MHz with 3-state outputs and active-low output enable. Available in SO-20 package with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- SN74BCT574NSRE4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74BCT574NSRE4?
- 8-bit octal flip-flop with 3-state bus outputs: buffers and registers 8 parallel data lines for address or data bus pipeline stages at up to 77 MHz clock frequency
- BCT logic family: BiCMOS technology provides TTL-compatible inputs with CMOS output drive, delivering 64 mA output sink current for driving backplane and memory bus loads with 50 pF capacitance
- Active-low output enable (OE): allows multiple SN74BCT574 devices to share a common bus with true high-impedance 3-state outputs, preventing bus contention in multi-master systems
What is SN74BCT574NSRE4 used for?
The SN74BCT574NSRE4 is used as an 8-bit data or address bus register in microprocessor and DSP system designs where it captures parallel data on the rising clock edge and holds it stable for downstream logic or memory bus interfaces operating at up to 77 MHz. Its 64 mA output sink current and 50 pF load specification make it suitable for driving heavily loaded VME, ISA, or custom backplane buses where standard CMOS logic lacks sufficient drive strength. The device also serves as an output port register in FPGA-based systems needing a buffered latch with 3-state capability to interface with TTL-level peripheral buses.
What are the specifications of SN74BCT574NSRE4?
| YTEOL | 0 |
| Control Type | ENABLE LOW |
| Count Direction | UNIDIRECTIONAL |
| Family | BCT/FBT |
| JESD-30 Code | R-PDSO-G20 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS DRIVER |
| Max Frequency@Nom-Sup | 77000000Hz |
| Max I(ol) | 0.064A |
| Number of Bits | 8 |
| Number of Functions | 1 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP20,.3 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | NOT SPECIFIED |
| Power Supply Current-Max (ICC) | 62mA |
| Prop. Delay@Nom-Sup | 10ns |
| Propagation Delay (tpd) | 10ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | BICMOS |
| Temperature Grade | COMMERCIAL |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
| Trigger Type | POSITIVE EDGE |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| HTS Code | 8542.39.00.60 |
Where can I find the SN74BCT574NSRE4 datasheet?
SN74BCT574NSRE4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74BCT574NSRE4?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the maximum clock frequency and output drive current of the SN74BCT574NSRE4?
The SN74BCT574NSRE4 supports a maximum clock frequency of 77 MHz at its nominal supply voltage and provides an output sink current (I_OL) of 64 mA, enabling it to drive heavily loaded TTL bus lines with up to 50 pF capacitive load while maintaining valid logic output levels across 8 parallel channels.
How does the BCT logic family of SN74BCT574NSRE4 differ from standard CMOS 74HC or 74ACT families for bus driving?
The BCT (BiCMOS Technology) family uses bipolar output transistors to achieve 64 mA output sink current — roughly 4 times the drive of a 74HC574 (8 mA) and comparable to 74ACT, but with lower static power than pure bipolar logic — making the SN74BCT574NSRE4 the preferred choice for driving long backplane traces or multiple memory chip select lines where standard CMOS families would produce excessive voltage droop under load.
In a multi-chip bus design, how does the active-low output enable of SN74BCT574NSRE4 prevent bus contention?
When OE (active-low output enable) is deasserted (logic high), all 8 outputs of the SN74BCT574NSRE4 enter a true high-impedance state regardless of clock or D inputs, allowing multiple 8-bit registers to share the same data bus by ensuring only 1 device drives the 8 lines at a time — a requirement for address multiplexing in 16-bit or 32-bit processor buses where up to 4 octal registers may be connected in parallel.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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