74LS91 8-Bit Shift Registers IC DIP-14

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74LS91 IC 8-Bit Shift Registers DIP-14 The 74LS91 IC 8-Bit Shift Registers DIP-14 is an 8-bit shift register integrated circuit housed in a 14-pin DIP (Dual In-line Package) configuration. It functions primarily as a decade counter, capable of dividing the input frequency by 10, providing binary-coded decimal outputs. This IC features serial-in and serial-out capabilities, enabling the shifting of data bits serially through the register. It supports synchronous operation with a clock input and carries a reset function to clear the count. The 74LS91 is useful in digital circuits for counting, frequency division, and data storage applications, making it a versatile component in timing and sequencing circuits. Its 14-pin package incorporates all necessary inputs and outputs for interfacing with other TTL logic devices, optimized for use in digital systems requiring stable and reliable 8-bit counting or shifting operations. Features Monolithic 8-bit serial-in, serial-out shift register. Utilizes transistor-transistor logic (TTL) circuits. Packaged in a 14-pin DIP type for easy integration. Data on input pins is clocked into the first register on clock pulse. Previous data shifts serially to accommodate new input (FIFO buffer). Supports cascaded operation for longer shift registers. Operates at a supply voltage of 5 V typical. Plastic/Epoxy package body material for durability. Terminal pitch of 2.54 mm compatible with standard DIP sockets. Suitable for digital circuits requiring data storage, buffering, or serial-to-parallel data conversion. Can be used to form buffers, delay lines, or shift registers of varying lengths. TTL compatible signals ensure easy interfacing with other logic ICs. Pinout Configuration Pin Number Pin Name Description 1 NC No Connection 2 NC No Connection 3 NC No Connection 4 NC No Connection 5 VCC Positive Supply Voltage 6 NC No Connection 7 NC No Connection 8 NC No Connection 9 CLK Clock Input 10 GND Ground 11 E Input E 12 D Input D 13 Q7 Output Q7 14 Q7‾\overline{Q7} Q 7 Output Q7 (Inverted) Specifications Parameters Description Technology Family LS Supply Voltage (Min) (V) 4.75 Supply Voltage (Max) (V) 5.25 High-level Output Current, I(OH) -400 µA Low-level Output Current, I(OL) 8 mA Operating Temperature Range 0 to 70 °C Typical Maximum Clock Frequency 18 MHz Typical Power Dissipation 80 mW Number of Bits 8 bits Package Type 14-pin DIP Operating Voltage (Nominal) 5V Applications Used as a data buffer to store serial data for later conversion to parallel output in digital systems.​ Serial-in, serial-out data shift operations for timing and sequence control—commonly found in microprocessor circuits.​ Frequency division and pulse counting functions (acting as counter in digital clocks, timers, and event counters).​ Data-handling in control systems, such as state machines, control logic, or digital communication interfaces.​ Can be cascaded to create longer shift registers or FIFO buffers for data handling and delay operations.​ Utilized in digital computers, data acquisition systems, and register-based memory elements.​ Signal processing and data serialization/deserialization tasks.​ Package Contents 1 x 74LS91 8-Bit Shift Registers IC DIP-14. Datasheet 74LS91