SN74HC244ADBR Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments SN74HC244ADBR is an 8-channel unidirectional bus buffer and line driver with 3-state outputs in a 20-SSOP package, operating from 2 V to 6 V across -40 to 85°C. It features active-low enable control and 150 pF load capacitance rating for robust bus driving. Available with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- SN74HC244ADBR 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
Key Features
- 8-channel unidirectional buffer with 3-state outputs and active-low enable for controlled bus isolation in CMOS digital systems
- Wide 2 V to 6 V supply range supporting both 3.3 V and 5 V logic families in mixed-voltage digital designs
- 20-SSOP compact surface-mount package rated for -40 to 85°C industrial temperature range with 150 pF load drive capability
Applications
The SN74HC244ADBR is used as a bus buffer and line driver in microprocessor address and data bus expansion, where 3-state outputs allow multiple drivers to share a common bus without contention. Its 2 V to 6 V supply range enables use in both 3.3 V and 5 V CMOS logic systems including FPGA I/O expansion, memory interface buffering, and LCD or peripheral bus driving. The 20-SSOP package suits compact digital control boards operating in -40 to 85°C industrial environments.
Specifications
| Pbfree Code | Yes |
| YTEOL | 0 |
| Control Type | ENABLE LOW |
| Count Direction | UNIDIRECTIONAL |
| Family | HC |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 150pF |
| Logic IC Type | BUS DRIVER |
| Max I(ol) | 0.0078A |
| 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 Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, SHRINK PITCH |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 0.08mA |
| Prop. Delay@Nom-Sup | 210ns |
| Propagation Delay (tpd) | 210ns |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 2V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| 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 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the 3-state output feature of the SN74HC244ADBR enable multi-driver bus sharing in microprocessor systems?
The SN74HC244ADBR's 3-state outputs allow the device to disconnect all 8 output channels from the bus when the active-low enable pin is deasserted, preventing bus contention when multiple drivers share the same data or address lines. This is essential in 8-bit microprocessor systems where memory, peripherals, and DMA controllers must arbitrate bus ownership across a shared 8-wire bus.
Can the SN74HC244ADBR interface between 3.3 V and 5 V logic families in a mixed-voltage digital design?
The SN74HC244ADBR operates across a 2 V to 6 V supply range, which allows it to be powered at 3.3 V or 5 V, but it does not perform level shifting between different voltage domains — the input and output logic thresholds are referenced to the same VCC. For 3.3 V to 5 V translation, a dedicated level shifter is required; however, within a single 3.3 V or 5 V domain it drives 8 channels with up to 150 pF load per output.
For an industrial control board operating at -40°C, how does the SN74HC244ADBR's temperature rating affect bus reliability?
The SN74HC244ADBR is rated across -40 to 85°C industrial temperature range, ensuring all 8 buffer channels maintain guaranteed HC-family logic levels and 150 pF drive capability even at cold startup. In industrial PLCs and panel controllers that power up in freezing environments, this temperature rating eliminates the output-low current degradation seen in commercial-grade logic ICs below 0°C.
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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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