1

®

FN9005.8

ISL6123, ISL6124, ISL6125,

ISL6126, ISL6127, ISL6128, ISL6130

Power Sequencing Controllers

The Intersil ISL6123, ISL6124, ISL6125, ISL6126, ISL6127,

ISL6128 and ISL6130 are integrated four channel

controlled-on/controlled-off power-supply sequencers with

supply monitoring, fault protection and a “sequence

completed” signal (RESET#). For larger systems, more than

four supplies can be sequenced by simply connecting a wire

between SYSRESET# pins of cascaded IC's. The ISL6125

uses four open-drain outputs to control the on/off sequencing

of four supplies, while the other sequencers use a patented,

micropower 7X charge pump to drive four external low-cost

NFET switch gates above the supply rail by 5.3V. These IC's

can be biased from any supply 5V down to 1.5V. Individual

product descriptions follow.

The four channel ISL6123 (ENABLE input), ISL6124

(ENABLE# input) and ISL6125 ICs offer the designer 4 rail

control when it is required that all four rails are in minimal

compliance prior to turn on and that compliance must be

maintained during operation. The ISL6123 and ISL6130

have a low power standby mode when disabled, suitable for

battery powered applications.

The ISL6125 operates like the ISL6124 but instead of

charge pump driven gate drive outputs it has open drain

logic outputs for direct interface to other circuitry.

In contrast to the majority, for both the ISL6126 and ISL6130

each of the four channels operates independently so that the

various GATEs will turn on once its individually associated

input voltage requirements are met.

The ISL6127 is a pre programmed A-B-C-D turn-on and

D-C-B-A turn-off sequenced IC. Once all inputs are in

compliance and ENABLE is asserted the sequencing starts

and each subsequent GATE will turn-on after the previous

one completes turning-on.

The ISL6128 has two groups of two channels each with its

independent I/O and is ideal for voltage sequencing into

redundant capability loads as all four inputs need to be

satisfied prior to turn on but a single group fault is ignored by

the other group.

External resistors provide flexible voltage threshold

programming of monitored rail voltages. Delay and

sequencing are provided by external capacitors for both

ramp up and ramp down.

Additional I/O is provided indicating and driving RESET state

in various configurations.

For volume applications, other programmable options and

features can be had. Contact the factory with your needs.

Features

• Enables arbitrary turn-on and turn-off sequencing of up to

four power supplies (0.7V to 5V)

• Operates from 1.5V to 5V supply voltage

• Adjustable voltage slew rate for each rail

• Multiple sequencers can be daisy-chained to sequence an

infinite number of independent supplies

• Glitch immunity

• Under voltage lockout for each supply

• 1µA Sleep State (ISL6123, ISL6130)

• Active high (ISL6123, ISL6130) or low (ISL6124, ISL6125,

ISL6126, ISL6127, ISL6128) ENABLE# input

• Open drain version available (ISL6125)

• Voltage Determined Sequence (ISL6126, ISL6130)

• Pre-programmed Sequence available (ISL6127)

• Dual channel groupings (ISL6128)

• QFN package with Pb-free plus anneal option (RoHS

compliant)

Applications

• Graphics cards

• FPGA/ASIC/microprocessor/PowerPC supply sequencing

• Network routers

• Telecommunications systems

Pinout

ISL6123, ISL6124, ISL6125,

ISL6126, ISL6127, ISL6128, ISL6130

(24 LD QFN)

TOP VIEW

1

2

3

4

5

6

18

17

16

15

14

13

24

23

22

21

20

19

7

8

9

10

11

12

4mmx4mm

ENABLE/

ENABLE#

GATE_A

DLY_OFF_C

DLY_OFF_D

GATE_B

GATE_C

DLY_OFF_B

UVLO_D

DLY_ON_D

DLY_ON_C

UVLO_C

DLY_OFF_A

Data Sheet

February 5, 2007

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-468-3774

Copyright Intersil Americas Inc. 2001, 2003-2007. All Rights Reserved.

All other trademarks mentioned are the property of their respective owners.