The 74LS194 bidirectional shift register is designed to incorporate virtually all of the features a system designer may want in a shift register; they feature parallel inputs, parallel outputs, right-shift and left-shift serial inputs, operating-mode-control inputs, and a direct overriding clear line. The register has four distinct modes of operation, namely: Parallel load, Shift right, Shift left, Inhibit clock. Synchronous parallel loading is accomplished by applying the four bits of data and taking both mode control inputs, S0 and S1, HIGH. The data is loaded into the associated flip-flops and appear at the outputs after the positive transition of the clock input. During loading, serial data flow is inhibited. Shift right is accomplished synchronously with the rising edge of the clock pulse when S0 is HIGH and S1 is LOW. Serial data for this mode is entered at the shift-right data input. When S0 is LOW and S1 is HIGH, data shifts left synchronously, and new data is entered at the shift-left serial input. Clocking of the flip-flop is inhibited when both mode control inputs are LOW.
Features
- Parallel inputs and outputs
- Four operating modes:
Synchronous parallel load
Right shift
Left shift
Do nothing - Positive edge-triggered clocking
- Direct overriding clear
Specifications
| Product Attribute | Attribute Value |
| Product Category: | Counter Shift Registers |
| Counting Sequence: | Serial/Parallel to Parallel |
| Number of Circuits: | 1 |
| Number of Bits: | 4 bit |
| Package/Case: | PDIP-16 |
| Logic Family: | 74LS |
| Logic Type: | Bipolar |
| Number of Input Lines: | 2 / 1 |
| Propagation Delay Time: | 26 ns |
| Supply Voltage – Max: | 5.25 V |
| Minimum Operating Temperature: | 0 C |
| Maximum Operating Temperature: | + 70 C |
| Packaging: | Tube |
| Function: | Shift Register |
| Mounting Style: | Through Hole |
| Number of Output Lines: | 1 |
| Operating Supply Voltage: | 4.75 V to 5.25 V |
| Operating Temperature Range: | 0 C to + 70 C |
| Product Type: | Counter Shift Registers |
74LS194 DataSheet
