Overview
The SN74HC244PWR, produced by Texas Instruments, is an octal buffer and line driver with 3-state outputs. This device is part of the 74HC series, known for its high performance and low power consumption. It is designed to enhance the performance and density of 3-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters. The SN74HC244 is organized as two 4-bit buffers and drivers with separate output-enable (OE) inputs, allowing for flexible control over the output states.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage Range (VCC) | 2 | - | 6 | V |
| Input Clamp Current (IIK) | - | - | ±20 | mA |
| Output Clamp Current (IOK) | - | - | ±20 | mA |
| Continuous Output Current (IO) | - | - | ±35 | mA |
| Junction Temperature (TJ) | - | - | 150 | °C |
| Storage Temperature (Tstg) | -65 | - | 150 | °C |
| Output Drive at VCC = 5 V | - | - | ±6 | mA |
| Propagation Delay (tpd) at VCC = 4.5 V | 42 | - | - | ns |
| Low Input Current | - | - | 1 | µA |
| Power Consumption (ICC) at VCC = 6 V | - | - | 80 | µA |
Key Features
- Wide operating voltage range of 2 V to 6 V.
- High-current outputs drive up to 15 LSTTL loads.
- 3-state outputs drive bus lines or buffer memory address registers.
- Low power consumption: ICC = 80 µA (maximum).
- Typical propagation delay (tpd) = 11 ns at VCC = 5 V.
- ±6 mA output drive at VCC = 5 V.
- Low input current of 1 µA (maximum).
- Separate output-enable (OE) inputs for each 4-bit buffer.
Applications
- Servers
- LED Displays
- Network Switches
- Telecom Infrastructure
- Motor Drivers
- I/O Expanders
- Bus interface type applications where output drive or PCB trace length is a concern.
Q & A
- What is the operating voltage range of the SN74HC244?
The operating voltage range is from 2 V to 6 V.
- How many LSTTL loads can the SN74HC244 drive?
The SN74HC244 can drive up to 15 LSTTL loads.
- What is the typical propagation delay of the SN74HC244 at VCC = 5 V?
The typical propagation delay is 11 ns.
- What is the maximum output current of the SN74HC244 at VCC = 5 V?
The maximum output current is ±6 mA.
- How much power does the SN74HC244 consume at VCC = 6 V?
The power consumption is ICC = 80 µA (maximum).
- What is the purpose of the output-enable (OE) inputs?
The OE inputs control the output states, allowing the outputs to be in a high-impedance state when OE is high.
- What are some common applications of the SN74HC244?
Common applications include servers, LED displays, network switches, telecom infrastructure, motor drivers, and I/O expanders.
- What is the junction temperature range of the SN74HC244?
The junction temperature range is from -40°C to 85°C for the SN74HC244.
- How should unused inputs be handled to ensure proper device operation?
Unused inputs must be held at VCC or GND to ensure proper device operation.
- What is the storage temperature range for the SN74HC244?
The storage temperature range is from -65°C to 150°C.
