SN64BCT244NSR Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
SN64BCT244NSR is a non-inverting 8-bit bus driver from Texas Instruments featuring two 4-bit sections with 3-state outputs and active-low output-enable control. The BCT-family device supports unidirectional bus driving with power-off disable to allow live insertion without bus contention. Housed in a 20-pin SOIC package, it targets backplane, memory, and CPU-to-bus buffering in embedded and industrial systems.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- SN64BCT244NSR Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN64BCT244NSR?
- Non-inverting 8-bit (2x4-bit) 3-state bus driver
- Power-off disable outputs permit live insertion without bus contention
- Active-low output enable for unidirectional flow control
- BCT/FBT logic family for high-drive 3-state backplane buffering
- 50 pF load capacitance rating for robust bus driving
- 20-pin SOIC (R-PDSO-G20) package with RoHS-compliant construction
What is SN64BCT244NSR used for?
The SN64BCT244NSR is used as a high-drive bus buffer on address, data, and control buses in embedded processors, single-board computers, and VME or PCI backplane systems where live-board insertion is required. Its 3-state outputs and active-low enable also make it suitable for memory interface buffering and bus isolation in industrial control equipment.
What are the specifications of SN64BCT244NSR?
| Pbfree Code | Yes |
| YTEOL | 0 |
| Additional Feature | POWER OFF DISABLE OUTPUTS TO PERMIT LIVE INSERTION |
| Control Type | ENABLE LOW |
| Count Direction | UNIDIRECTIONAL |
| Family | BCT/FBT |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS DRIVER |
| Max I(ol) | 0.064A |
| Number of Bits | 4 |
| Number of Functions | 2 |
| 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) | 260 |
| Power Supply Current-Max (ICC) | 80mA |
| Prop. Delay@Nom-Sup | 6ns |
| Propagation Delay (tpd) | 6ns |
| 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 | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
Where can I find the SN64BCT244NSR datasheet?
SN64BCT244NSR Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN64BCT244NSR?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the power-off disable feature of SN64BCT244NSR benefit hot-swap backplane designs?
When VCC is removed or absent, the SN64BCT244NSR automatically disables its outputs and presents a high-impedance state on all 8 output pins, preventing the device from loading the bus during live insertion. This avoids bus contention and protects other drivers on shared backplane data lines, which typically operate at 3.3 V or 5 V logic levels.
What load capacitance is SN64BCT244NSR rated for, and how does that affect signal integrity?
SN64BCT244NSR is rated for a load capacitance of 50 pF per output, which means it can reliably drive typical PCB traces and bus stubs on a backplane without significant signal degradation. Designers targeting low-skew data bus buffering at frequencies up to several tens of MHz can rely on this 50 pF specification when calculating trace length and termination requirements.
Is SN64BCT244NSR pin-compatible with standard 74BCT244 bus drivers from other vendors?
Yes, the SN64BCT244NSR follows the industry-standard 74BCT244 pin assignment in a 20-pin SOIC package, which makes it directly interchangeable with equivalent devices from other manufacturers. Both output-enable pins (1OE and 2OE) are active-low and share the same pinout, and the 8 I/O pairs maintain identical 1A–4A / 1Y–4Y ordering across compatible suppliers.
In which embedded system bus architectures is SN64BCT244NSR most commonly deployed?
SN64BCT244NSR is commonly used in ISA, VMEbus, and custom parallel-bus embedded architectures where an 8-bit unidirectional buffer is needed to isolate high-capacitance backplane segments from local processor buses operating at 3.3 V or 5 V. It also appears in DRAM and SRAM address buffering stages and in FPGA I/O expansion circuits requiring 3-state drive capability.
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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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