Integrated Circuits

74390
Dual decade ripple counter
PDF datasheet
       
1CP 0 1  • 16 Vcc
1MR 2 15 2CP 0
1Q0 3 14 2MR
1CP 1 4 13 2Q0
1Q1 5 12 2CP 1
1Q2 6 11 2Q1
1Q3 7 10 2Q2
GND 8 9 2Q3
       
Pin Symbol Description
1 1CP 0 clock input, divide-by-2 section (high-to-low, edge-triggered)
2 1MR asynchronous master reset (active high)
3 1Q0 flip-flop output
4 1CP 1 clock input, divide-by-5 section (high-to-low, edge-triggered)
5 1Q1 flip-flop output
6 1Q2 flip-flop output
7 1Q3 flip-flop output
8 GND ground
9 2Q3 flip-flop output
10 2Q2 flip-flop output
11 2Q1 flip-flop output
12 2CP 1 clock input, divide-by-5 section (high-to-low, edge-triggered)
13 2Q0 flip-flop output
14 2MR asynchronous master reset (active high)
15 2CP 0 clock input, divide-by-2 section (high-to-low, edge-triggered)
16 Vcc supply voltage


Specifications
(typical values under recommended operating conditions, unless specified)
Parameter Value Unit
Propagation delay, nCP 0 to nQ0 14 (74HC)
18 (74HCT)
ns
Propagation delay, nCP 1 to nQ1 15 (74HC)
19 (74HCT)
ns
Propagation delay, nCP 1 to nQ2 23 (74HC)
26 (74HCT)
ns
Propagation delay, nCP 1 to nQ3 15 (74HC)
19 (74HCT)
ns
Propagation delay, nMR to nQn 16 (74HC)
18 (74HCT)
ns
Maximum clock frequency, nCP 0 and nCP 1 66 (74HC)
61 (74HCT)
MHz

Note
Data is maintained by an independent source and accuracy is not guaranteed. Check with the manufacturer's datasheet for up-to-date information.

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