Overview
The SN74HCT244NSRG4 is an octal buffer and line driver with 3-state outputs, produced by Texas Instruments. This device is part of the 74HCT series, which is compatible with TTL (Transistor-Transistor Logic) levels. It is designed to improve the performance and density of bus interface applications, particularly where output drive and PCB trace length are critical.
The SN74HCT244NSRG4 is organized as two 4-bit buffers and drivers with separate output-enable (OE) inputs. When the OE input is low, the device passes non-inverted data from the A inputs to the Y outputs. When the OE input is high, the outputs are in the high-impedance state, which is essential for bus-oriented systems.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage Range (VCC) | 4.5 | 5 | 5.5 | V |
| High-Level Input Voltage (VIH) | 2 | V | ||
| Low-Level Input Voltage (VIL) | 0.8 | V | ||
| Output Current (IO) | ±6 mA | mA | ||
| Propagation Delay Time (tpd) | 13 | 25 | 38 | ns |
| Operating Free-Air Temperature (TA) | -40 | 85 | °C | |
| Power Dissipation Capacitance per Buffer/Driver | 40 | pF | ||
| Input Current (II) | ±0.1 | µA | ||
| Supply Current (ICC) | 80 | µA |
Key Features
- Wide Operating Voltage Range: The device operates within a voltage range of 4.5 V to 5.5 V, making it versatile for various applications.
- High-Current Outputs: Capable of driving up to 15 LSTTL loads, ensuring robust output drive.
- 3-State Outputs: Outputs can be set to a high-impedance state, which is crucial for bus-oriented systems.
- Low Power Consumption: Maximum supply current (ICC) of 80 µA, contributing to low power consumption.
- Fast Switching Times: Propagation delay times as low as 13 ns, ensuring high-speed data transfer.
- TTL Compatible Inputs: Accepts TTL voltage levels, making it compatible with a wide range of logic circuits.
Applications
- Servers and Data Centers: Used in high-drive applications where output drive and PCB trace length are critical.
- LED Displays: Suitable for driving LED displays due to its high-current output capabilities.
- Network Switches and Telecom Infrastructure: Ideal for bus interface applications in networking and telecom equipment.
- Motor Drivers and I/O Expanders: Can be used in motor control circuits and as I/O expanders in various systems.
Q & A
- What is the operating voltage range of the SN74HCT244NSRG4?
The operating voltage range is from 4.5 V to 5.5 V.
- How many LSTTL loads can the SN74HCT244NSRG4 drive?
The device can drive up to 15 LSTTL loads.
- What is the maximum propagation delay time of the SN74HCT244NSRG4?
The maximum propagation delay time is approximately 38 ns at 5.5 V.
- What is the purpose of the output-enable (OE) input?
The OE input controls the state of the outputs; when low, the outputs are active, and when high, the outputs are in the high-impedance state.
- What is the maximum supply current (ICC) of the SN74HCT244NSRG4?
The maximum supply current is 80 µA.
- What are the typical applications of the SN74HCT244NSRG4?
Typical applications include servers, LED displays, network switches, telecom infrastructure, motor drivers, and I/O expanders.
- What is the operating temperature range of the SN74HCT244NSRG4?
The operating temperature range is from -40°C to 85°C.
- How many buffers and drivers are in the SN74HCT244NSRG4?
The device is organized as two 4-bit buffers and drivers.
- What is the power dissipation capacitance per buffer/driver?
The power dissipation capacitance per buffer/driver is approximately 40 pF.
- Is the SN74HCT244NSRG4 compatible with TTL logic levels?
Yes, the device is compatible with TTL voltage levels.
- What package types are available for the SN74HCT244NSRG4?
The device is available in various packages including PDIP, SOIC, SSOP, SOP, and TSSOP.
