| Type | Description | Common ICs |
|---|---|---|
| Asynchronous (Ripple) | Cascaded flip-flops; clock applied to first stage only | 74LS90, 74LS93 |
| Synchronous | All flip-flops share same clock signal | 74LS160, 74LS161, 74LS163 |
| Up/Down | Counts forward or backward based on control signal | 74LS190, 74LS191, 74LS192, 74LS193 |
| Decade | Counts 0–9 (BCD) | 74LS90, 74LS160 |
| Modulo-N | Custom count sequence (e.g., Mod-6, Mod-12) | Designed using reset feedback |
Note: Use synchronous counters for higher speed and glitch-free operation.
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