Integrated Circuits

4520
Dual 4-bit synchronous binary counter
PDF datasheet
       
1CP0 1  • 16 Vcc
1CP 1 2 15 2MR
1Q0 3 14 2Q3
1Q1 4 13 2Q2
1Q2 5 12 2Q1
1Q3 6 11 2Q0
1MR 7 10 2CP 1
GND 8 9 2CP0
       
Pin Symbol Description
1 1CP0 counter 1 clock input (low-to-high triggered)
2 1CP 1 counter 1 clock input (high-to-low triggered)
3 1Q0 counter 1 output
4 1Q1 counter 1 output
5 1Q2 counter 1 output
6 1Q3 counter 1 output
7 1MR counter 1 master reset (active high)
8 GND ground
9 2CP0 counter 2 clock input (low-to-high triggered)
10 2CP 1 counter 2 clock input (high-to-low triggered)
11 2Q0 counter 2 output
12 2Q1 counter 2 output
13 2Q2 counter 2 output
14 2Q3 counter 2 output
15 2MR counter 2 master reset (active high)
16 Vcc supply voltage

Notes
  • The 4520 counts from 0 to 15. The 4518 is identical but counts from 0 to 9.
  • Either nCP0 or nCP 1 may be used as the clock input; the other can be used as a clock enable input.
  • If nCP 1 is high, the counter advances on a low-to-high transition of nCP0.
  • If nCP0 is low, the counter advances on a high-to-low transition of nCP 1.

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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