American Football NCAA Rule 3-3-4-a
When timeouts are not exhausted and are available, an official shall allow a charged team timeout when requested by any player or head coach when the ball is dead. Consecutive charged team timeouts are not allowed by the same team in any individual dead ball period.
Each team is entitled to three charged team timeouts during each half, with no more than one charged team timeout available per team, per individual dead ball period.