74190: Decade (÷10) Up/Down Counter (Synchronous, Presettable)

This is a synchronous decade counter that counts in either direction. One input clock is used.

For a normal up-counting sequence, Load should be high, Enable should be low, Up/Down should be low.

The counter advances one count on each ground-to-positive transition of the input clock. Outputs Q1, Q2, Q4, and Q8 are weighted 1-2-4-8 BCD. The clock must be noise free.

To count down, the Up/Down input is made high.

To load, the desired word is placed on Load inputs L1, L2, L4, and L8, and the Load input is briefly brought low. There is no separate Clear input; to clear the counter, load all zeros.

The ripple clock output can be used for cascading, along with the Max/Min output gating. Refer to data sheet for more information about applications.

Pinout
Pin # Pin Assignment
1 Input 2
2 Output 2
3 Output 1
4 Enable
5 Up/Down
6 Output 4
7 Output 8
8 Ground
9 Input 8
10 Input 4
11 Load
12 Max/Min Out
13 Ripple Clock Out
14 Clock
15 Input 1
16 Power (+5V)

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