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SN74LVC244A: Chattering at undetermined input region

Part Number: SN74LVC244A
Other Parts Discussed in Thread: SN74LS06,

Hi team,

Could you give me comment on following customer question? The customer also considers Schmitt trigger input type logic, but they want to understand the phenomenon about the chattering. 

<Customer question>

Q1. For SN74LS06, the customer has observed chattering at undetermined region from VIL 0.8V to VIH 2V. And, the signal is in the undetermined region at least by 40us due to using low pass filter (0.1k, 0.1u) at input line. But using SN74LVC244A at the same low pass filter with SN74LS06, the chattering hasn't observed. What is the difference in terms of happen of chattering between SN74LS06 and SN74LVC244A?

Best regards,

Takeshi Sasaki