The MM74C902N is an IC (integrated circuit) component that is designed as a serial-parallel converter for keyboard applications. It is developed by Fairchild Semiconductor Corporation. Below is an overview and key features of the MM74C902N:
1. Overview:
The MM74C902N is a CMOS (Complementary Metal-Oxide-Semiconductor) device that serves as an interface between a serial data source (such as a keyboard) and a parallel data sink (such as a microprocessor). It receives data in a serial format and converts it into parallel form to be easily processed by a computer or other digital devices.
2. Key Features:
Here are some important features of the MM74C902N:
a. 8-Bit Parallel Output: The IC has 8 parallel output lines that provide the converted data in parallel format.
b. Serial Input: It accepts a serial data stream as input, typically sourced from a keyboard or similar input device.
c. Keyboard Scan Timing: The MM74C902N has internal timing circuitry that enables it to control the keyboard scan timing. It ensures accurate scanning of the keyboard matrix.
d. Debounce Circuit: The IC incorporates a debounce circuit to eliminate bounce glitches caused by mechanical switches in the keyboard. It ensures reliable and accurate input detection.
e. No External Components Required: The MM74C902N is designed to operate without any external components, simplifying the circuit design and reducing the component count
