Updated: 10/07/2019 by Computer Hope

TTL may refer to any of the following:

TTL in black lettering on green background.

1. Short for transistor-transistor logic, TTL was developed by Texas Instruments in 1965. A TTL is a common digital circuit where the output is derived from two transistors.

2. Short for time-to-live, TTL is a value specified in every packet transmitted on the Internet according to the Internet Protocol. The TTL value specifies how many more hops the packet can travel before its delivery fails, and the packet is disregarded.

With communications using IPv6, a packet's TTL is called its hop limit.

Computer acronyms, Network terms