A register is a group of flip-flops suitable for storing binary
Each flip-flop is a binary cell capable of storing one bit of
An n bit register has a group of n flip-flops and is capable of
storing binary information containing n bit.
The register is mainly used for storing and shifting binary data
entered into it from an external source.
3. 4 Bit Shift Register
A number of registers are
available in MSI circuits.
The register has an common
There are four input I1,I2,I3 and
I4 in 4 bit shift register.
There are four output Q1,Q2,Q3
and Q4 in 4 bit shift register.
This register uses the D flip-flop
A group of flip-flops sensitive to
pulse duration is called a latch
4. Shift Registers
• A register cabable of shifting binary
information either to left or right is called
• Shift Register
6. Serial-in Serial-out Shift Register
• Serial-in to Serial-out (SISO) - the data is shifted serially “IN”and “OUT” of
the register, one bit at a time in either a left or right direction under clock