RT9716A/B

2

DS9716A/B-01 April 2011

www.richtek.com

Pin No.

Pin Name

Pin Function

1

STBY

Standby input-active low, logic level signal, Internal pulled up to AUXIN.

2

3.3VIN

Input pin for 3.3V output voltage.

3

3.3VOUT

Switched output that delivers 0V,3.3V or high impedance to card.

4, 5, 13, 14, 16

NC

No Internal Connection.

6

SYSRST

System reset input-active low, logic level signal, Internal pulled up to AUXIN for

RT9716A or floating for RT9716B.

7, 21 (Exposed Pad) GND

GND for maximum power dissipation.

8

PERST

A logic level power good to slot (with delay).

9

CPUSB

Card present input for USB cards, Internal pulled up to AUXIN.

10

CPPE

Card present input for PCI cards, Internal pulled up to AUXIN.

11

1.5VOUT

Switched output that delivers 0V,1.5V or high impedance to card.

12

1.5VIN

Input pin for 1.5V output voltage.

15

AUXOUT

Switched output that delivers 0V,AUX or high impedance to card.

17

AUXIN

AUX input for AUXOUT and chip power.

18

RCLKEN

Reference Clock Enable signal. As an output, a logic power good to host for slot

(no delay-open drain). As an input, if kept inactive(low) by the host, prevents

PERST from being de-asserted. Internal pulled up to AUXIN

19

FLG

Over current or over temperature status output for slot (open drain)

20

SHDN

Shutdown input-active low, logic level signal. Internal pulled up to AUXIN

Functional Pin Description

Typical Application Circuit

RT9716A/B

3.3VIN

3.3VOUT

GND

RCLKEN

AUXIN

AUXOUT

1.5VIN

1.5VOUT

SYSRST

SHDN

STBY

PERST

CPPE

CPUSB

FLG

22uF

22uF

3.3V

3.3V

1.5V

SYSRST

SHDN

STBY

FLG

3.3VOUT

AUXOUT

1.5VOUT

PERST

CPPE

CPUSB

RCLKEN

4.7uF

4.7uF

4.7uF

22uF

100k