PCA9509P

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Product data sheet

Rev. 1 — 14 August 2012

2 of 23

NXP Semiconductors

PCA9509P

1.1 Selection recommendations

The PCA9509P should be used if an external A-port pull-up resistor is required to adjust

current for noise margin considerations or to reduce operating current consumption. See

Table 1 for comparison.

[1]

The PCA9509 current mirrors do not shut down when the device is disabled allowing instant turn-on, but at

the cost of the higher standby current. The PCA9509A and PCA9509P current mirrors are turned off when

disabled for lowest standby power consumption, but sufficient delay (10

s) after enable is needed before

resuming operation.

[2]

Operating currents do not include the current consumed by the external pull-ups on B-port or the external

pull-ups on the A-port of the PCA9509P.

2.

Features and benefits

applications

Remark: The maximum system operating frequency may be less than 400 kHz

because of the delays added by the repeater.

JESD22-C101

Table 1.

Device selection recommendation

Concern

Recommended device

PCA9509

PCA9509A

PCA9509P

A-port — lowest voltage

0.1 V

0.85 V

0.85 V

A-port — current source[1]

yes — 1 mA

yes — 270

A

no — external pull-up

operating current[2]

<6.1 mA

<1.9 mA

< 0.95mA

standby current EN = LOW

< 2 mA

< 22

A max.

< 22

A max.