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Original question:
[FAQ] What are the performance specifications of the HCS logic family at 3.3V operation?
Hi,
Values from the FAQ : https://e2e.ti.com/support/logic-group/logic/f/logic-forum/993726/faq-what-are-the-performance-specifications-of-the-hcs-logic-family-at-3-3v-operation
| VT+ | Positive switching threshold | 3.3 V | 1.22 | 1.93 | 2.358 | V | |
| VT- | Negative switching threshold | 3.3 V | 0.768 | 1.28 | 2.04 | V |
The FAQ link to an Excel file : 6303.linear_interpolation_v2.xlsx
When I try to recalculate VT threshold with HCS family datasheet I find same value for VT+ but not for VT-
74HCS165 Datasheet (other component like HCS04 or HCS14 have same values) :
XLS : Same VT+ values (1.22/2.358) as in the FAQ but VT- are different 0.612/1.164 versus 0.768/2.04
=> How can you explain the difference for VT-?
=> What are the correct values?
