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The 74LS323 8-bit Universal Shift Register with 3-state outputs. Its function is similar to the SN54/74LS299 except for Synchronous Reset. Input parallel load and flip-flop outputs are multiplexed to minimize pin counting. For flip-flops, separate inputs and outputs are provided through Q0 and Q7. There are four operation modes possible: Store, shift right, shift left and parallel load. All modes are activated on Low to high transition of the clock.
| Pin Number | Pin Name | Description |
| 1, 19 | S0 and S1 | Input Pins for Mode Select |
| 3, 4 | OE1 & OE2 | 3-State Output Enable Inputs |
| 4, 5, 6, 7, 13, 14,15,16 | I/O0 – I/O7 | Parallel Output (3-State) or
Parallel Data Input |
| 8, 17 | Q0 and Q7 | Serial Output |
| 9 | SR | Synchronous Reset Input |
| 11 | DS0 | Serial Data Input for Right Shift |
| 18 | DS7 | Serial Data Input for Left Shift |
| 12 | CP | Clock Pulse (input) |
| 7 | VSS | Ground (- supply) |
| 14 | VCC | 5V, 10V, 15V +Supply Voltage |
| Name | Type |
| 74LS379 | Quad Parallel Shift Register |
| CD4035 | 8-Bit Shift Register |
| 4014 | 4-Bit Static Shift Register |
| 74HC595 | Dual 4-bit Static Register |
| 74LS166 | 8-bit Shift Register |
| 74LS299 | 8 Bit Shift/Storage Register |
The 74LS323 is an 8-bit Universal Shift/Storage Register often used in projects where many LEDs have to be controlled through the Microcontroller. It can also be used to interface LCD screens because it can act as the data bit for the LCD display.
It is commonly used with microcontrollers or microprocessors to expand the GIPO functionalities. To choose the mode two function-select inputs (S0, S1) and two output-control inputs (Q0, Q7) can be used. A simple circuit is given below to show the application of 74LS323.
