MM74C922WM

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The MM74C922WM is a logic integrated circuit (IC) developed by ON Semiconductor, widely used in signal switches, multiplexers, and decoders. It is a 4-bit synchronous programmable counter with parallel load capability and output logic. In addition, it has 4 decoded outputs and buffered parallel inputs. It is typically used in control or count systems where it is advantageous to preset the data into the counter prior to operation. This integrated circuit can also be used in applications requiring a wide variety of division ratios.

Features

• 4-bit counter with synchronous parallel load.
• 4 decoded outputs.
• CMOS Technology.
• Low power consumption.
• TTL input levels.

Applications

The MM74C922WM counter is used in a variety of applications. It is suitable for repetitive operations, monitoring, and time-delay operations. This unit can provide a wide variety of division ratios depending on the count type and mode selected.

• Automotive/Automotive diagnostic systems.
• 3D GPU rendering.
• Cellular/Mobile phone.
• Security systems.
• Industrial controllers and monitoring systems.

Working Principle

The working principle of the MM74C922WM is based on a synchronous counters with parallel load capability and output logic. The counter has four clock inputs, that can be synchronized to the same source enabling the unit to be clocked from a single clock source. It has four parallel data inputs that are loaded into the counter, when a positive-going pulse is applied to the Load input (LOAD). When the carry output (COUT) goes high and remains high until the counter is reset to zero. If the reset (RST) has a logic high applied, the count can be reset to zero.

The count type and mode are selectable with the mode type inputs. The count type can be selected between down or up-counting, while the counter mode can be selected between divider or modulo. When the counter is in modulo count mode, the current count will be repetitively compared with the preset count value loaded at the parallel input and the COUT remains high until the Up/Down count reaches the preset count.

The decoded outputs are available at the 4-bit flip-flop, each output will have a logic high or low dependent on the current state of the counter.

Advantages/Limitations

The MM74C922WM provides various advantages to the user. Being manufactured using CMOS technology, this IC is more efficient, which makes it easier for the user to achieve significant power savings. The logical levels of the inputs are also TTL compatible, which reduces the system complexity and cost. The majority of the IC’s components are also internally regulated, offering superior performance in all operating conditions.

The major limitation of this IC is its power requirements, as it needs over 10mA of current at +5V to operate. Thus, this IC should be used in applications where a high amount of power is acceptable.

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