SN74ALS244CNS Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments SN74ALS244CNS is an octal 3-state non-inverting bus buffer and line driver with two 4-bit enable controls, operating from a 5 V supply with 24 mA output drive, in a 20-pin SOP package. From $0.80 in stock worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- ACTIVE
- Datasheet
- SN74ALS244CNS Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74ALS244CNS?
- Octal 3-state outputs allow the SN74ALS244CNS to safely share an 8-bit data bus with other drivers without contention
- 24 mA output drive current supports long bus traces and multiple load connections typical in backplane and memory interface designs
- ALS-family low-power Schottky logic reduces switching current versus standard TTL while maintaining full TTL-compatible 5 V operation
What is SN74ALS244CNS used for?
The SN74ALS244CNS is used in bus interface circuits, memory address buffers, and microprocessor data bus expansion where high drive current and 3-state control are required. Its dual 4-bit enable inputs allow the 8-bit buffer to be split into two independent nibble-width sections, adding flexibility in 8086 or Z80 style memory interface designs. Industrial and embedded system designers also use it to isolate and buffer shared parallel data buses connecting multiple peripherals to a CPU.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the SN74ALS244CNS datasheet?
SN74ALS244CNS Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74ALS244CNS?
Compatible alternatives and drop-in replacements for SN74ALS244CNS:
Frequently Asked Questions
What output drive current and logic family does the SN74ALS244CNS belong to, and why does this matter for bus driving?
The SN74ALS244CNS is an Advanced Low-power Schottky (ALS) TTL device that provides 24 mA output sink current per channel at 5 V supply. This 24 mA drive capability allows it to source or sink current for multiple bus loads—such as 8 CMOS or TTL inputs—simultaneously without voltage droop, making it a reliable choice for memory data bus buffering and peripheral interface applications in 5 V digital systems.
How do the 3-state outputs of the SN74ALS244CNS prevent bus contention in a shared 8-bit data bus design?
Each of the 8 output channels of the SN74ALS244CNS can be placed in a high-impedance (3-state) condition by asserting the output enable pins, effectively disconnecting the driver from the bus. This prevents contention when multiple bus masters or buffer chips share the same 8-bit data lines, as only the active master drives the bus at any time while all others present high-Z outputs—critical in multiplexed bus architectures with 2 or more bus masters.
For a microprocessor memory expansion design, when is the SN74ALS244CNS preferred over a CMOS HC244 buffer?
The SN74ALS244CNS is preferred over HC244 in 5 V TTL-level systems where the input thresholds must be compatible with older TTL output levels (V_OH as low as 2.4 V), since the ALS device is guaranteed to switch correctly from TTL-level inputs. The HC244 requires inputs above 3.5 V to guarantee a logic high at 5 V supply, which can cause marginal operation when driven by TTL outputs. Additionally, the 24 mA drive strength of the SN74ALS244CNS exceeds the 6 mA to 8 mA typical of HC244, better supporting longer PCB traces and heavier bus loading.
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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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