CY7C65213A TXDEN signal polarity

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SuSh_1535366
Level 5
Level 5
Distributor - Macnica (Japan)
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Hello,

When RS485 is enabled in CY7C65213A, according to the timing chart of the data sheet, the TXDEN signal seems to be active low (low at transmitting).

However, most RS485 level shifter ICs appear to require active high (High when transmitting) logic for the RE # and DE signals.

Do I need an inverter IC to connect these ICs?
Or is there a setting to invert the signal output of CY7C65123A?

Regards,

Shimamura

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1 Solution
HirotakaT_91
Moderator
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Moderator
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Good question.

Unfortunately, the TXDEN signal is active low, you need to use an inverter to make it active high.

(Updated) It is a mistake of Cypress datasheet. TXDEN signal is active high. We will consider to update the datasheet.

Best regards,

Hirotaka Takayama

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HirotakaT_91
Moderator
Moderator
Moderator
500 replies posted 250 replies posted 100 replies posted

Good question.

Unfortunately, the TXDEN signal is active low, you need to use an inverter to make it active high.

(Updated) It is a mistake of Cypress datasheet. TXDEN signal is active high. We will consider to update the datasheet.

Best regards,

Hirotaka Takayama