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What is TTL?

April 26, 2017TTL

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What is TTL?

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“TTL” stands for “Time To Live” and refers often to the amount of time given to an item in the cache before it expires and must refreshed.

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TTL stands for transistor-transistor logic, but is used to describe voltage levels of 0 V and 5 V, with threshold values at 0.8 V and 2 V. Another popular standard is LVTTL which use voltage levels of 0 V and 3.3 V but are compatible with TTL thresholds. CMOS has a range of voltages with the thresholds at around 50%. Care must be taken when mixing logic levels because it’s possible to burn out a lower voltage chip. Also, some technologies may not provide sufficient current sourcing ability to properly drive others, for example TTL and CMOS. Note: In the networking domain, TTL has a different meaning: time-to-live.