74HC245N is a bidirectional data buffer IC with output state locking capability, commonly used in communication applications between devices with different voltage levels or for signal isolation. Here are some basic information about 74HC245N:
1. Main functions:
Data buffering: This IC acts as a buffer to transfer signals from input to output without changing the logic state of the signal.
Bidirectional data transmission: 74HC245N can transmit data in both directions between two buses (A and B).
Output state locking: This IC has the ability to lock (tri-state) its outputs, meaning that when the OE (Output Enable) control signal is high, all its outputs will be in a high impedance state, preventing signal transmission.
2. IC pins:
Pin 1 (DIR): Controls the data transmission direction (A to B or B to A).
Pin 19 (OE): Controls the operational state of the IC. When OE is low, the IC operates normally. When OE is high, all outputs are in a high impedance state.
Pins 2-9 (A0-A7): Data bus A.
Pins 18-11 (B0-B7): Data bus B.
Pin 10 (GND): Ground connection.
Pin 20 (VCC): Power supply.
3. Voltage and current:
Operating voltage: 2V to 6V, typically 5V.
Current consumption: Very low, typically below 1µA in static state.
4. Applications:
Communication between circuits with different voltage levels.
Signal isolation between devices.
Used in microcontroller circuits to expand data bus.
This IC is commonly used in microcontroller circuits, communication circuits, and applications that require data buffering and signal isolation.