Overview
The SN74HC244DWRSV, produced by Texas Instruments, is an octal buffer and line driver integrated circuit. It is designed to enhance the performance and density of 3-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters. The device is organized as two 4-bit buffers and drivers with separate output-enable (OE) inputs. When the OE input is low, the device passes noninverted 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 crucial for bus applications and memory address registers.
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 | |
| Propagation Delay Time (tpd) at VCC = 4.5V | 42 | 49 | ns | |
| Output Drive at VCC = 5V | ±6 | mA | ||
| Low Power Consumption (ICC) | 80 | µA | ||
| Input Current (II) | 1 | 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 of 80 µA (maximum).
- Typical propagation delay time (tpd) of 11 ns.
- ±6 mA output drive at VCC of 5 V.
- Low input current of 1 µA (maximum).
- Separate output-enable (OE) inputs for each 4-bit buffer.
- High-impedance state during power up or power down when OE is tied to VCC through a pullup resistor.
Applications
- Servers
- LED Displays
- Network Switches
- Telecom Infrastructure
- Motor Drivers
- I/O Expanders
Q & A
- What is the operating voltage range of the SN74HC244DWRSV? The operating voltage range is 2 V to 6 V.
- How many LSTTL loads can the high-current outputs drive? The high-current outputs can drive up to 15 LSTTL loads.
- What is the purpose of the 3-state outputs? The 3-state outputs drive bus lines or buffer memory address registers.
- What is the maximum power consumption of the SN74HC244DWRSV? The maximum power consumption is 80 µA.
- What is the typical propagation delay time (tpd) of the SN74HC244DWRSV? The typical propagation delay time is 11 ns.
- How much current can the outputs drive at VCC of 5 V? The outputs can drive ±6 mA at VCC of 5 V.
- What is the maximum input current of the SN74HC244DWRSV? The maximum input current is 1 µA.
- How are the outputs controlled in the SN74HC244DWRSV? The outputs are controlled by separate output-enable (OE) inputs for each 4-bit buffer.
- What should be done to ensure the high-impedance state during power up or power down? The OE should be tied to VCC through a pullup resistor.
- In what types of applications is the SN74HC244DWRSV commonly used? It is commonly used in servers, LED displays, network switches, telecom infrastructure, motor drivers, and I/O expanders.
