Details of pulse counters or frequency dividers

Introduced: September 1968

IPC and CPC are identically structured here. All 6 subcodes exist in both systems.

2 shared codes have differing titles between IPC and CPC.

Child Classifications

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H03K 21/02 Input circuits +2 CPC IPC+CPC Available in IPC and CPC
H03K 21/08 Output circuits IPC+CPC Available in IPC and CPC
H03K 21/16 Circuits for carrying over pulses between successive decades IPC+CPC Available in IPC and CPC
H03K 21/18 Circuits for visual indication of the result IPC+CPC Available in IPC and CPC
H03K 21/38 Starting, stopping or resetting the counter (counters with a base other than a power of two H03K23/48, H03K23/66) since 1985 IPC+CPC Available in IPC and CPC
H03K 21/40 Monitoring; Error detection; Preventing or correcting improper counter operation since 1985 +2 CPC IPC+CPC Available in IPC and CPC