SN74LVC244ANE4 Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
SN74LVC244A is an 8-channel non-inverting bus driver with 3-state outputs and active-low enable control. Operating in the LVC family from a 1.65 V to 3.6 V supply, it sources or sinks 24 mA per output for high-drive bus interfacing. Packaged in a 20-pin DIP for through-hole assembly in address bus, data bus, and signal buffering applications.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- SN74LVC244ANE4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74LVC244ANE4?
- 8 non-inverting channels with 3-state outputs for bus isolation control
- 24 mA output drive current (I(ol) max) for heavy bus loading
- LVC CMOS family operating from 1.65 V to 3.6 V supply
- Active-low output enable for unidirectional bus driver control
- 50 pF rated load capacitance per output channel
- 20-pin PDIP package for through-hole and socketed prototype designs
What is SN74LVC244ANE4 used for?
The SN74LVC244A is used as a unidirectional data bus driver and address line buffer in microprocessor systems, isolating the processor bus from high-capacitance memory or I/O peripheral loads. It also serves as a signal repeater on backplane buses where multiple cards share a common 3.3 V parallel data bus, with the 24 mA output drive ensuring reliable signal levels across extended PCB traces. In FPGA and CPLD development boards, it buffers high-fan-out clock or data lines to prevent excessive loading on programmable device outputs.
What are the specifications of SN74LVC244ANE4?
| Pbfree Code | Yes |
| YTEOL | 0 |
| Control Type | ENABLE LOW |
| Count Direction | UNIDIRECTIONAL |
| Family | LVC/LCX/Z |
| JESD-30 Code | R-PDIP-T20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS DRIVER |
| Max I(ol) | 0.024A |
| 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 | DIP20,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Packing Method | TUBE |
| Power Supply Current-Max (ICC) | 0.04mA |
| Prop. Delay@Nom-Sup | 7.2ns |
| Propagation Delay (tpd) | 16.4ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 3.6V |
| Supply Voltage-Min (Vsup) | 1.65V |
| Supply Voltage-Nom (Vsup) | 3.3V |
| Surface Mount | NO |
| Technology | CMOS |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| HTS Code | 8542.39.00.60 |
Where can I find the SN74LVC244ANE4 datasheet?
SN74LVC244ANE4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74LVC244ANE4?
Compatible alternatives and drop-in replacements for SN74LVC244ANE4:
Frequently Asked Questions
How does the SN74LVC244A's 3-state output improve bus sharing between multiple devices?
The SN74LVC244A's 3-state outputs allow the device to disconnect all 8 channels from the bus simultaneously when the active-low output enable is deasserted high, presenting a high-impedance state that prevents bus contention. In a shared bus system with multiple bus drivers, only one driver is enabled at a time while others remain in high-impedance, ensuring that conflicting logic levels do not appear on the bus simultaneously. This is essential in memory bus designs where address decoders select one of several SRAM or peripheral chips, each driving or reading the same shared data lines.
What supply voltage range does the SN74LVC244A support and which microcontroller families are compatible?
The SN74LVC244A operates from a 1.65 V to 3.6 V supply, making it directly compatible with 1.8 V, 2.5 V, and 3.3 V logic families used by modern ARM Cortex-M, RISC-V, and low-power microcontrollers. At 3.3 V, its input thresholds accept signals down to approximately 0.8 V (logic low) and above 2.0 V (logic high), covering the LVC/LVCMOS specification. For 5 V TTL compatibility, the SN74LVC244A inputs are also 5 V tolerant in most configurations, simplifying mixed-voltage board designs.
For a memory interface design, why choose the SN74LVC244A over a plain logic gate for address line buffering?
A dedicated bus driver like the SN74LVC244A provides 24 mA output current with guaranteed voltage swing margins, whereas general-purpose CMOS gates are typically rated for only 4 mA to 8 mA. On an address bus driving multiple SRAM chips simultaneously, the cumulative input capacitance can exceed 200 pF; the SN74LVC244A's 24 mA drive strength and 50 pF rated load per output reduce propagation delay and signal rise times to under 5 ns per channel at 3.3 V. The 3-state control also allows the buffer to be disabled during power-down states, preventing leakage currents from back-driving other bus devices.
When would the 20-pin PDIP package of the SN74LVC244ANE4 be selected over the SOIC or TSSOP variants?
The 20-pin PDIP package with 2.54 mm through-hole pin spacing is preferred for hand-soldered prototypes, socketed evaluation boards, and field-replaceable designs where component swapping is routine. Its 5.08 mm body width and through-hole leads provide strong mechanical retention compared to SOIC or TSSOP pads, making it more robust in connector-adjacent areas subject to mechanical stress. Production designs targeting minimal PCB area typically switch to the 20-pin SOIC (SN74LVC244ADW) or TSSOP (SN74LVC244APWR) which reduce land area by approximately 60% and 75% respectively compared to the PDIP.
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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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