74194 Bit PIPO Shift Register

The M54/74HC194 is a high speed CMOS 4 BIT PIPO SHIFT REGISTER fabricated in silicon  gate CMOS technology.

It has the same high speed performance of LSTTL combined with  true CMOS low power consumption. This SHIFT REGISTER is designed to incorporate  virtually all of the features a system designer may want in a shift register. It  features parallel inputs,  parallel outputs, right shift and left shift serial  inputs, clear line. The register has four distinct modes of operation : PARALLEL  (broadside) LOAD ; SHIFT RIGHT (in the direction QA QD); SHIFT LEFT ; INHIBIT CLOCK  (do nothing). Synchronous parallel loading is accomplished by applying the four  data bits and taking both mode control inputs, S0 and S1 high.

The data are loaded  into their respective flip-flops and appear at the outputs after the positive  transition of the CLOCK input. In 74194 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 flipflops is in hibited when  both mode control inputs are low. The mode control inputs should be changed only  when the CLOCK input is high. All inputs are equipped with protection circuits against  static discharge and transient excess voltage.

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Features of 74194 Shift Register

• V_CC Supply Voltage -0.5 to +7 V

• V_I DC Input Voltage -0.5 to VCC + 0.5 V

• V_O DC Output Voltage -0.5 to VCC + 0.5 V

• I _IK DC Input Diode Current ± 20 mA

• I_OK DC Output Diode Current ± 20 mA

• I_O DC Output Source Sink Current Per Output Pin ± 25 mA

• I_CC or I_GND DC VCC or Ground Current ± 50 mA

• P_D Power Dissipation 500 (*) mW

• T_stg Storage Temperature -65 to +150 oC

• T_L Lead Temperature (10 sec) 300 oC