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ISL8723 の電気的特性と機能

ISL8723のメーカーはIntersil Corporationです、この部品の機能は「(ISL8723 / ISL8724) Power Sequencing Controllers」です。


製品の詳細 ( Datasheet PDF )

部品番号 ISL8723
部品説明 (ISL8723 / ISL8724) Power Sequencing Controllers
メーカ Intersil Corporation
ロゴ Intersil Corporation ロゴ 




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ISL8723 Datasheet, ISL8723 PDF,ピン配置, 機能
®
Data Sheet
ISL8723, ISL8724
December 21, 2006
FN6413.0
Power Sequencing Controllers
The Intersil ISL8723 and ISL8724 are 4 channel sequencers
controlling the on and off sequence of voltages with under
voltage supply fault protection and a “sequence completed”
signal (RESET#). For larger systems, more than 4 voltages
can be sequenced by a simple connection of multiple IC's.
These sequencers use an integrated charge pump to drive 4
external low-cost N-channel MOSFET switch gates above
the IC bias voltage by 5.3V. These IC's can be biased from
and control any supply from 2.5V to 5V and additionally
monitor any voltage above 0.7V. Individual product
descriptions are below.
The four channel ISL8723 (ENABLE input), ISL8724
(ENABLE# input) offer the designer 4 voltage 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 ISL8723 has a low power standby mode
when it is disabled suitable for battery powered applications.
External resistors provide flexible voltage threshold
programming of monitored voltages. Delay and sequencing
timing are programmable by external capacitors for both
ramp up and ramp down.
Ordering Information
PART NUMBER
TEMP.
PART RANGE
MARKING (°C)
PKG.
PACKAGE DWG. #
ISL8723IRZ (Note) 8723IRZ -40 to +85 24 Ld 4x4 QFN L24.4x4
ISL8724IRZ (Note) 8724IRZ
(Pb-free)
L24.4x4
ISL8723IRZ-T (Note) 8723IRZ
ISL8724IRZ-T (Note) 8724IRZ
-40 to +85 24 Ld 4x4 QFN L24.4x4
(Pb-free)
L24.4x4
Tape & Reel
ISL8723EVAL1
Evaluation Platform
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100% matte
tin plate termination finish, which are 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
• Enables arbitrary turn-on and turn-off sequencing of up to
four power supplies (0.7V to 5V)
• Operates from 2.5V to 5V supply voltage
• Supplies VDD +5.3V of charge pumped gate drive
• Adjustable voltage slew rate for each rail
• Multiple sequencers can be easily daisy-chained to
sequence an infinite number of independent voltages
• Glitch immunity
• Under voltage lockout for each monitored supply voltage
• 30µA Sleep State (ISL8723)
• Active high (ISL8723) or low (ISL8724) ENABLE# input
• Pb-free plus anneal available (RoHS compliant) QFN
Package
Applications
• Graphics cards
• FPGA/ASIC/microprocessor/PowerPC supply sequencing
• Network Routers
• Telecommunications Systems
Pinout
ISL8723, ISL8724
(24 LD QFN)
TOP VIEW
24 23 22 21 20 19
ENABLE/
ENABLE# 1
18 DLY_OFF_A
GATE_A 2
17 UVLO_C
DLY_OFF_C 3
DLY_OFF_D 4
4mmx4mm
16 DLY_ON_C
15 DLY_ON_D
GATE_B 5
14 UVLO_D
GATE_C 6
13 DLY_OFF_B
7 8 9 10 11 12
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2006. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.

1 Page





ISL8723 pdf, ピン配列
ISL8723, ISL8724
Pin Descriptions (Continued)
PIN
# PIN NAME
FUNCTION
22 SYSRST# System Reset I/O
9,11, No Connect No Connect
19
DESCRIPTION
As an input, allows for immediate and unconditional latch-off of all GATE outputs when driven low. This pin
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 pulls 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 ISL872x
sequencers.
This pin is released to go high once all UVLO and enable conditions are satisfied and is pulled low
concurrent with the last GATE being turned off after EN disabled.
No Connect
3 FN6413.0
December 21, 2006


3Pages


ISL8723 電子部品, 半導体
ISL8723, ISL8724
the ~10ms enable delay to initiate DLY_ON cap charging
when released to go high. This feature can be used where
4 voltages can be monitored in addition to a on-off switch
position or, in the case of the ISL8724 a present pin pull
down.
Restart of the turn on sequence is automatic once all
requirements are met. This allows for no interaction
between the sequencer and a controller IC if so desired.
If no capacitors are connected between DLY_ON or
DLY_OFF pins and ground then all such related GATEs
start to turn on immediately after the 10ms (TUVLOdel)
ENABLE stabilization time out has expired and the GATEs
start to immediately turn off when ENABLE is deasserted.
Table 1 illustrates the nominal time delay from the start of
charging to the 1.27V reference for various capacitor
values on the DLY_X pins. This table does not include the
10ms of enable lock out delay during a start up sequence
but represents the time from the end of the enable lock out
delay to the start of GATE transition. There is no enable
lock out delay for a sequence off, so this table illustrates
the delay to GATE transition from a disable signal.
TABLE 1.
NOMINAL DELAY TO SEQUENCING THRESHOLD
DLY PIN CAPACITANCE
TIME (ms)
Open
0.02
100pF
0.135
1000pF
1.35
0.01μF
13.5
0.1μF
135
1μF 1350
NOTE: Nom. TDEL_SEQ = dly_cap (µF) X 1.35MΩ
Figure 2 illustrates the turn-on and Figure 3 the nominal turnoff
timing diagrams of the ISL8723 and ISL8724 product.
Note the delay and flexible sequencing possibilities. Multiple
series, parallel or adjustable capacitors can be used to easily
fine tune timing between that offered by standard value
capacitors.
6 FN6413.0
December 21, 2006

6 Page



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共有リンク

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部品番号部品説明メーカ
ISL8723

(ISL8723 / ISL8724) Power Sequencing Controllers

Intersil Corporation
Intersil Corporation
ISL8724

(ISL8723 / ISL8724) Power Sequencing Controllers

Intersil Corporation
Intersil Corporation


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