PCF8831 datasheet(13/28 Pages) PHILIPS

13 / 28 page

2002 Aug 14

Philips Semiconductors

Preliminary speciﬁcation

STN RGB - 160 output row driver

PCF8831

11.1

Power-up and power-down sequences

When the PCF8831 is powering-up or powering-down, the various supply voltages and some interface signals have to

be applied in a certain sequence.

Table 2

Power-up and power-down sequences

Tamb = −40 to +85 °C; refer to Figs 7 and 8.

Notes

1. With no VH or VMH supply, both pads VH and VMH are clamped by separate internal diodes to VDD, see Fig.10.

2. When no VL is supplied, pad VL is clamped to VSS by a separate internal diode, see Fig.10.

3. When ROWRES2 is active (at VSS), the level not-selected goes to VSS and pad VM can be disconnected.

SYMBOL

PARAMETER

CONDITIONS

MIN.

UNIT

td(VDD-VH)

delay VDD(on) to VH(on)

note 1

td(VDD-VMH)

delay VDD(on) to VMH(on)

note 1

td(VDD-VL)

delay VDD(on) to VL(on)

note 2

td(VH-VDD)

delay VH(off) to VDD(off)

note 1

td(VMH-VDD)

delay VMH(off) to VDD(off)

note 1

td(VL-VDD)

delay VL(off) to VDD(off)

note 2

tPU(VH-SVM)

power-up time VH(on) to SVM inactive

SVM falls to VSS

0ns

tPU(VMH-SVM) power-up time VMH(on) to SVM inactive

SVM falls to VSS

0ns

tPU(VL-SVM)

power-up time VL(on) to SVM inactive

SVM falls to VSS

0ns

trel(RES1-SVM) ROWRES1 release time to SVM inactive

release ROWRES1 before making

SVM inactive

0ns

trel(RES1)

ROWRES1 release time

allow at least one rising RCLK edge

before releasing ROWRES1

trel(RES2)

ROWRES2 release time

deﬁne VM when ROWRES2 is

inactive; note 3

0ns

tPD(VH)

power-down time from SVM active to VH(off)

0ns

tPD(VMH)

power-down time from SVM active to VMH(off)

0ns

tPD(VL)

power-down time from SVM active to VL(off)

0ns

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