18. On the 74LVC2G74 FF O PRESET is active low; CLEAR is active low O PRESET is active low; CLEAR is active high O PRESET is active high; CLEAR is active low O PRESET is active high; CLEAR is active high 19. Can I use latches to make synchronous counters? Ο NO O YES 20. Both the 74LVC2G74 and the 74LVC1G73 devices have tri-state outputs. O TRUE O FALSE 21. A shift-register can O perform parallel to serial data conversion O perform serial to parallel data conversion O all of the above O none of the above 22. Which counter circuit requires a special initial condition? O a binary counter O a modulo-n counter O a decade counter O a ring counter 23. It is recommended that the OE input on a 74LVC1G373 be tied high using a pullup resistor. O TRUE O FALSE
Introduction
74LVC1G373:
It is recommended to tie the OE input of a 74LVC1G373 high using a pullup resistor in order to ensure proper device operation. This technique will allow the output to be enabled in order to properly perform its operations. When OE is low, the output will be placed in a high-impedance state, effectively disconnecting it from any other circuits connected to it. Many applications use this technique, including shift registers and counters.
Latches:
It can also be used to create synchronous counters, as long as the clock signal is connected to the enabled input. This allows the counter to take one step every time the clock signal goes high, thus increasing the speed and accuracy of the counter.
Binary modulo-n:
A binary, modulo-n, decade, and ring counter all require specialized initial conditions in order to work properly. A binary counter requires an initial count of 0, a modulo-n counter requires the initial count to match the modulus size, a decade counter requires the initial count to be 9, and a ring counter requires the initial count to be at the first stage in order to properly rotate through the sequence.
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