ISL8703A

Adjustable Quad Sequencer

Product Status: Mass Production

OVERVIEW

The ISL8700A, ISL8701A, ISL8702A, ISL8703A, ISL8704A, ISL8705A family of ICs provide four delay adjustable sequenced outputs while monitoring an input voltage all with a minimum of external components.

High performance DSP, FPGA, µP and various subsystems require input power sequencing for proper functionality at initial power-up and the ISL870XA provides this function while monitoring the distributed voltage for over and undervoltage compliance.

These ICs operate over the +3.3V to +24V nominal voltage range. All have a user adjustable time from UV and OV voltage compliance to sequencing start via an external capacitor when in auto start mode and adjustable time delay to subsequent ENABLE output signal via external resistors.

Additionally, the ISL8702A, ISL8703A, ISL8704A and ISL8705A provide I/O for sequencing on and off operation (SEQ_EN) and for voltage window compliance reporting (FAULT) over the +3.3V to +24V nominal voltage range.

Easily daisy chained for more than 4 sequenced signals.Altogether, the ISL870XA provides these adjustable features with a minimum of external BOM.

KEY FEATURES

  • Adjustable Delay to Subsequent Enable Signal
  • Adjustable Delay to Sequence Auto Start
  • Adjustable Distributed Voltage Monitoring
  • Under and Overvoltage Adjustable Delay to Auto Start Sequence
  • I/O Options
  • ENABLE (ISL8700A, ISL8702A, ISL8704A) and
  • ENABLE# (ISL8701A, ISL8703A, ISL8705A)
  • SEQ_EN (ISL8702A, ISL8703A) and
  • SEQ_EN# (ISL8704A, ISL8705A)
  • Voltage Compliance Fault Output
  • Pb-Free (RoHS Compliant)

PARAMETRICS

Parameters
ISL8703A
Basic Information
Production Status
Mass Production
VBIAS (min)
3.3 V
VBIAS (max) (V)
24
Sequenced Voltages (min)
3.3 V
Sequenced Voltages (max)
24 V
Enable
Active Low
Logic Level (s)
TTL
Initial Startup Requirements
UV/OV & EN
Monitored Inputs
1
Sequenced Output Control
Active Low, Open Drain
# of Channels that Turn Off When VIN is non-compliant
4 Simultaneous
Preset Or Adjustable Sequence
Preset Order, Adjustable Delay
Features
Fault Reporting
Power Down Sequencing
Yes
Qualification Level
Standard
Sequenced Voltages Range (V)
3.3 to 24
Bias Voltage Range (V)
3.3 to 24
Temperature Range
-40 to +85

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