Part number : 7491, 74LS91, 74HC91
Functions : 8-bit Shift Register
Package : 14 Pin DIP type
Manufactures : Hitachi, Texas Instruments
Image
Description
This serial-in, serial-out, 8-bit shift register is composed of eight R-S master-slave flip-flops, input gating, and a clock drive. Single-rail data and input control are gated through inputs A and B and an internal inverter to form the complementary inputs to the first bit of the shift register. Drive for the internal common clock line is provided by an inverting clock driver. This clock pulse inverter/driver causes these circuits to shift information one bit on the positive edge of an input clock pulse.
Pinout
Features
1. High Speed Operation: tpd (Data Word Input to Output) = 21 ns typ (CL = 50 pF)
2. High Output Current: Fanout of 10 LSTTL Loads
3. Wide Operating Voltage: VCC = 2 to 6 V
4. Low Input Current: 1 µA max
5. Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
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Truth Table
Applications
1. Digital Computer System
2. Data-Handling System
3. Control System