Production Data

WM8782

w

PD, August 2006, Rev 4.2

15

Test Conditions

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Power Supply Input Timing Information

DVDD level to activate POR

– power on

Measured from DGND

0.7

V

AVDD level to activate POR –

power on

Measured from AGND

0.7

V

VMID level to activate POR –

power on

Measured from AGND

0.7

V

DVDD level to release POR –

power on (see notes 1 and 2)

Measured from DGND

DVDD Min

V

AVDD level to release POR –

power on (see notes 1 and 2)

Measured from AGND

AVDD Min

V

VMID level to release POR –

power on (see notes 1 and 2)

Measured from AGND

1

V

POR active period (see notes

1 and 2)

Measured from POR

active to POR release

30

(note 6)

Defined by DVDD/AVDD/

VMID Rise Time

µs

DVDD level to activate POR

– power off (see note 5)

Measured from DGND

0.8

V

AVDD level to activate POR –

power off (see note 5)

Measured from AGND

0.8

V

VMID level to activate POR –

power off (see note 5)

Measured from AGND

0.7

V

Power on - POR propagation

delay through device

Measured from rising

EDGE of POR

30

µs

Power down - POR

propagation delay through

device

Measured from falling

EDGE of POR

30

µs

Notes:

1.

2.

3.

The rate of rise of VMID depends on the rate of rise of AVDD, the internal 50kΩ resistance and the external

decoupling capacitor. Typical tolerance of 50K resistor can be taken as +/-20%.

4.

If AVDD, DVDD or VMID suffer a brown-out (i.e. drop below the minimum recommended operating level but do

the recommended level again.

5.

if the supply is turned on and off frequently by a power management system.

6.

guaranteed by design rather than test.