3

FN9005.4

June 10, 2005

2

GATE_A

FET Gate Drive

Output

ISL6125 Open

Drain Outputs

Drives the external FETs with a 1µA current source to soft start ramp into the load.

On the ISL6125 only, these are open drain outputs that can be pulled up to a maximum of VDD

voltage.

5GATE_B

6GATE_C

7GATE_D

22

SYSRST#

System Reset I/O

As an input, allows for immediate and unconditional latch-off of all GATE outputs when driven low. This

input can also be used to initiate the programmed sequence with ‘zero’ wait (no 10ms stabilization delay)

from input signal on this pin being driven high to first GATE. As an output when there is a UV condition this

pin pull low. If common to other SYSRST# pins in a multiple IC configuration it will cause immediate and

unconditional latch-off of all other GATEs on all other ISL612X sequencers. This pin is a NC on ISL6126

and ISL6128

19

No Connect No Connect

No Connect

ISL612X Variant Feature Matrix

PART

NAME

EN/EN#

CMOS/

TTL

GATE DRIVE

OR OPEN

DRAIN

OUTPUTS

REQUIRED

CONDITIONS

FOR INITIAL

START-UP

NUMBER OF

UVLO

INPUTS

MONITORED

BY EACH

RESET#

NUMBER OF

CHANNELS

THAT

TURN-OFF

WHEN 1

UVLO

FAULTS

PRESET OR

ADJUSTABLE

SEQUENCE

NUMBER OF

UVLO AND

PAIRS OF I/O

FEATURES

ISL6123

EN

TTL

Gate Drive

4 UVLO

1 EN

4 UVLO

4 Gates

Adjustable On &

Off

4 Monitors with

1 I/O

Auto restart

ISL6124

EN#

CMOS

Gate Drive

4UVLO

1 EN

4 UVLO

4 Gates

Adjustable On &

Off

4 Monitors with

1 I/O

Auto restart

ISL6125

EN#

CMO

Open Drain

4 UVLO

1 EN

4 UVLO

4 Open Drain Adjustable On &

Off

4 Monitors with

1 I/O

Auto restart

ISL6126

EN#

CMOS

Gate Drive

1 UVLO

1 EN

4 UVLO

1 Gate

Adjustable Off 4 Monitors with

1 I/O

Gates independent

on as UVLO Valid

ISL6127

EN#

CMOS

Gate Drive

4 UVLO

1 EN

4 UVLO

4 Gates

Preset

4 Monitors with

1 I/O

Auto restart

ISL6128

EN#

CMOS

Gate Drive

4 UVLO

2 EN

2 UVLO

2 Gates

Preset

2 Monitors

with 2 I/O

Dual Redundant

Operation

PIN #

PIN NAME

FUNCTION

DESCRIPTION

ISL6123, ISL6124, ISL6125, ISL6126, ISL6127, ISL6128