US12231

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

8 of 15

www.unisonic.com.tw

QW-R502-A82.a



FUNCTIONAL TRUTH TABLES

Table 1. Truth Table for Voltage Outputs

VOLTAGE INPUTS (Note 1)

LOGIC INPUTS

VOLTAGE OUTPUTS (Note 2)

MODE (Note 3)

SHDN

STBY

CP

(Note 4)

Off

x

x

x

x

x

Off

Off

Off

OFF

On

x

x

0

x

x

GND

GND

GND

Shutdown

On

x

x

1

x

1

GND

GND

GND

No Card

On

On

On

1

0

0

On

Off

Off

Standby

On

On

On

1

1

0

On

On

On

Card Inserted

Notes: 1. For input voltages, On means the respective input voltage is higher than its turnon threshold voltage;

otherwise, the voltage is Off (for AUX input, Off means the voltage is close to zero volt.)

2. For output voltages, On means the respective power switch is turned on so the input voltage is connected

to the output; Off means the power switch and its output discharge FET are both off; GND means the

power switch is off but the output discharge FET is on so the voltage on the output is pulled down to 0V.

3. Mode assigns each set of input conditions and respective output voltage results to a different name. These

modes are referred to as input conditions in the following Truth Table for Logic Outputs.

4. CP = CPUSB and CPPE -equal to 1 when both CPUSB and CPPE signals are logic high, or equal to 0

when either CPUSB or CPPE is low.

Table 2. Truth Table for Logic Outputs

INPUT CONDITIONS

LOGIC OUTPUTS

MODE

SYSRST

RCLKEN (Note 1)

PERST

RCLKEN (Note 2)

OFF

X

X

0

0

Shutdown

No Card

Standby

Card Inserted

0

Hi-Z

0

1

0

0

0

0

1

Hi-Z

1

1

1

0

0

0

Notes: 1. RCLKEN as a logic input in this column. RCLKEN is an I/O pin and it can be driven low externally, left open,

or connected to high-impedance terminals, such as the gate of a MOSFET. It must not be driven high

externally.

2. RCLKEN as a logic output in this column.