US12231

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

2 of 15

www.unisonic.com.tw

QW-R502-A82.a



MARKING INFORMATION

PACKAGE

MARKING

TSSOP-20

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PIN CONFIGURATION



PIN DESCRIPTION

PIN NO.

PIN NAME

I/O

DESCRIPTION

1

SYSRST

I

System Reset input – active low, logic level signal. Internally pulled up to

AUXIN.

2

SHDN

I

Shutdown input – active low, logic level signal. Internally pulled up to AUXIN.

3

STBY

I

Standby input – active low, logic level signal. Internally pulled up to AUXIN.

4, 5

I

3.3-V input for 3.3VOUT

6, 7

O

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

8

PERST

O

A logic level power good to slot 0 (with delay)

9

NC

No connection

10

GND

Ground

11

CPUSB

I

Card Present input for USB cards. Internally pulled up to AUXIN.

12

CPPE

I

Card Present input for PCI Expresscards

13, 14

O

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

15,16

I

1.5-V input for 1.5VOUT

17

O

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

18

I

AUX input for AUXOUT and chip power

19

RCLKEN

I/O

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

for slot 0 (no delay – open drain). As an input, if kept inactive (low) by the host,

prevents PERST from being de-asserted. Internally pulled up to AUXIN.

20

OC

O

Overcurrent status output for slot 0 (open drain)