ISL8724 Intersil Corporation, ISL8724 Datasheet - Page 14

• Manufacturer Part Number: ISL8724
• Description: (ISL8723 / ISL8724) Power Sequencing Controllers
• Manufacturer: Intersil Corporation

Application Implementations
Multiple Sequencer Implementations
In order to control the sequencing of more than 4 voltages in
applications where the integrity of these critical voltages
must be assured prior to sequencing, several of the ISL8723
or ISL8724 devices can configured together to accomplish
this.
Figure 23 shows a typical multi sequencer implementation,
note the common SYSRST# signal that asserts once all
monitored voltages are valid allowing the sequence to
initiate. The sequencing is straight forward across multiple
sequencers as all DLY_ON capacitors will simultaneously
start charging once all monitored voltages area valid and
~10ms after the common ENABLE input signal is delivered.
This allows the choice of capacitors to be related to each
other no different than using a single sequencer. When the
common enabling signal is deasserted this configuration will
then execute the turn-off sequence across all sequencers as
programmed by the DLY_OFF capacitor values.
With all the SYSRST# pins bused together once the on
sequence is complete simultaneous shutdown upon any
UVLO input failure is assured as the SYSRST# output will
pull low, simultaneously turning off all GATE outputs.
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notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
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ISL8723, ISL8724
SUPPLY
ENABLE
POWER
FIGURE 23. MULTIPLE ISL872X CONFIGURATION
HIGH = SEQUENCE COMPLETED
ENABLE#
UVLO
UVLO
ENABLE#
SYSRST#
SYSRST#
ISL872X
RESET#
ISL872X
RESET#
HIGH = POWER GOOD
G
A
T
E
G
A
T
E
December 21, 2006
FN6413.0