PCA9509P View Datasheet(PDF) - NXP Semiconductors.

Part Name

Description

Manufacturer

PCA9509P

Low power level translating I2C-bus/SMBus repeater

NXP Semiconductors. 

NXP Semiconductors

PCA9509P

Low power level translating I2C-bus/SMBus repeater

[2] Care must be taken to minimize the resistance in series with the ground pin of the PCA9509P to the ground reference point of the VCC(A)

supply because there is only 80 mV margin between the power good threshold and the 0.8 V minimum supply voltage at cold

temperature (40 C). Because the B-side IOL of up to 30 mA flows through the resistance causing a voltage drop that effectively

reduces the VCC(A) to chip ground voltage and when VCC(A) is less than the power good voltage ~0.72 V, the PCA9509P is disabled. For

example, if the resistance is 1.4 , then 1.4   60 mA = 84 mV and 0.8 V  0.084 V = 0.716 V, which is less than the power good

threshold, so the PCA9509P disables when both outputs drive LOW.

[3] As long as the chip ground is common with the input ground reference the driver resistance may be as large as 120 . However, ground

offset rapidly decreases the maximum allowed driver resistance.

[4] Guaranteed by design.

PCA9509P

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 4 — 18 May 2018

© NXP B.V. 2018. All rights reserved.

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