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UNIVERSAL SHIFT REGISTER
Today, high speed bi-directional "universal" type Shift Registers such as the TTL 74LS194, 74LS195 or the CMOS 4035 are available as a 4-bit multi-function devices that can be used in either serial-to-serial, left shifting, right shifting, serial-to-parallel, parallel-to-serial, and as a parallel-to-parallel multifunction data register, hence the name "Universal". These devices can perform any combination of parallel and serial input to output operations but require additional inputs to specify desired function and to pre-load and reset the device.
Universal shift registers are very useful digital devices. They can be configured to respond to operations that require some form of temporary memory, delay information such as the SISO or PIPO configuration modes or transfer data from one point to another in either a serial or parallel format. Universal shift registers are frequently used in arithmetic operations to shift data to the left or right for multiplication or division.
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