ISL8700 Datasheet, PDF (1/13 Pages) Intersil Corporation – Adjustable Quad Sequencer

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Data Sheet
ISL8700, ISL8701, ISL8702
March 21, 2008
FN9250.2
Adjustable Quad Sequencer
The ISL8700, ISL8701, ISL8702 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 ISL870x provides this function while
monitoring the distributed voltage for over and undervoltage
compliance.
The ISL8700 and ISL8701 operate over the +2.5V to +24V
nominal voltage range, whereas the ISL8702 operates over
the +2.5V to +12V nominal voltage range. All three 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 ISL8702 provides an input for sequencing
on and off operation (SEQ_EN) and for voltage window
compliance reporting (FAULT) over the +2.5V to +12V
voltage range.
Easily daisy chained for more than 4 sequenced signals.
Altogether, the ISL870x provides these adjustable features
with a minimum of external BOM. See Figure 1 for typical
implementation.
Ordering Information
PART NUMBER PART
TEMP. PACKAGE PKG.
(Note)
MARKING RANGE (°C) (Pb-free) DWG. #
ISL8700IBZ* ISL 8700IBZ -40 to +85 14 Ld SOIC M14.15
ISL8701IBZ* ISL 8701IBZ -40 to +85 14 Ld SOIC M14.15
ISL8702IBZ* ISL 8702IBZ -40 to +85 14 Ld SOIC M14.15
ISL870xEVAL1 Evaluation Platform
*Add “-T” suffix for tape and reel. Please refer to TB347 for details
on reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ
special Pb-free material sets; molding compounds/die attach
materials and 100% matte tin plate PLUS ANNEAL - e3 termination
finish, which is RoHS compliant and compatible with both SnPb and
Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed
the Pb-free requirements of IPC/JEDEC J STD-020.
Features
• Adjustable Delay to Subsequent Enable Signal
• Adjustable Delay to Sequence Auto Start
• Adjustable Distributed Voltage Monitoring
• Undervoltage and Overvoltage Adjustable Delay to Auto
Start Sequence
• I/O Options
ENABLE (ISL8700, ISL8702) and ENABLE# (ISL8701)
SEQ_EN (ISL8702)
• Voltage Compliance Fault Output
• Pb-Free (RoHS Compliant)
Applications
• Power Supply Sequencing
• System Timing Function
2.5V TO 24V (2.5V TO 12V FOR ISL8702)
Ru
VIN
ENABLE_A
SEQ_EN*
ENABLE_B
ENABLE_C
UV
ENABLE_D
Rm
OV
FAULT*
GND TB TC TD TIME
Rl
EN
DC/DC
Vo1
EN
DC/DC
Vo2
EN
DC/DC
Vo3
EN
DC/DC
Vo4
* SEQ_EN and FAULT are not available on ISL8700 and ISL8701
FIGURE 1. ISL870x IMPLEMENTATION
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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