CD74HC4059
IC 74HC4059
The following circuit diagram is a divider through 10,000,000 to generate a 1PPS for a Banana PI out of a 10 MHz signal from a rubidium frequency standard. See also: Efratom LPRO-101 adjusting
divide-by-n mode: PIN latch enable = L ( PIN 2 )
ground: PIN 12 - Vcc: PIN 24
Kb ( PIN 13 ) = Kc ( PIN 11 ) = Low for master reset during power on
divide by 1000 ( n = 1000 )
input frequency 10000000 Hz = 10 MHz
output first stage 10000 Hz = 10 kHz
mode 5 -> preset value = 1000 / 5 = 200
n = 1000 = 5 * ( 0 * 1000 + 2 * 100 + 0 * 10 + 0 )
one ten hundred dec 0 0 0 0 2 jam j1 j2 j3 j4 j5 j6 j7 j8 j9 j10 j11 j12 j13 j14 j15 j16 Ka Kb Kc bin L L L L L L L L L L L L L H L L H L H PIN 3 4 5 6 22 21 20 19 18 17 16 15 10 9 8 7 14 13 11
divide by 2500 ( n = 2500 )
input frequency 5000 Hz = 5 kHz
output second stage 2 Hz
mode 5 -> preset value = 2500 / 5 = 500
n = 2500 = 5 * ( 0 * 1000 + 5 * 100 + 0 * 10 + 0 )
one ten hundred dec 0 0 0 0 5 jam j1 j2 j3 j4 j5 j6 j7 j8 j9 j10 j11 j12 j13 j14 j15 j16 Ka Kb Kc bin L L L L L L L L L L L L H L H L H L H PIN 3 4 5 6 22 21 20 19 18 17 16 15 10 9 8 7 14 13 11
Data sheet: 74HC4059