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LTC1536C Datasheet

  • LTC1536C

  • Linear Technology [Precision Triple Supply Monitor for PCI ...

  • LINER

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LTC1536
Precision Triple Supply Monitor
for PCI Applications
FEATURES
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
Simultaneously Monitors 5V, 3.3V and
Adjustable Inputs
Guaranteed Threshold Accuracy:
鹵0.75%
Low Supply Current: 100碌A
Internal Reset Time Delay: 200ms
Manual Pushbutton Reset Input
Active Low and Active High Reset Outputs
Active Low 鈥淪oft鈥?Reset Output
Power Supply Glitch Immunity
Guaranteed Reset for Either V
CC3
鈮?/div>
1V or V
CC5
鈮?/div>
1V
Meets PCI t
FAIL
Timing Specifications Rev 2.1
8-Pin SO and MSOP Packages
The LTC
廬
1536 is designed for PCI local bus applications
with multiple supply voltages that require low power,
small size, high speed and high accuracy supply
monitoring.
For 3.3V and 5V supplies that are > 500mV below spec or
for the condition when the 5V supply falls below the 3.3V
supply, the LTC1536 has a very fast response time capable
of meeting the PCI t
FAIL
timing specification. Tight 0.75%
threshold accuracy and glitch immunity ensure reliable
reset operation without false triggering.
The RST output is guaranteed to be in the correct state for
V
CC5
or V
CC3
down to 1V. The 100碌A typical supply current
makes the LTC1536 ideal for power-conscious systems.
A manual pushbutton reset input provides the ability to
generate a very narrow 鈥渟oft鈥?reset pulse (100碌s typ) or a
200ms reset pulse equivalent to a power-on reset. Both
SRST and RST outputs are open-drain and can be OR-tied
with other reset sources.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
s
s
PCI-Based Systems
Desktop Computers
Notebook Computers
Intelligent Instruments
Portable Battery-Powered Equipment
Network Servers
TYPICAL APPLICATIO
Motherboard PCI RST Generation
3.3V
鹵
0.3V
0.1碌F
1
5V
鹵
5%
0.1碌F
2
3
4
PWR GOOD
R
PU
SELECTED TO MEET RISE TIME
SLEW RATE REQUIREMENTS (1k MIN)
1536 TA01
LTC1536
V
CC3
V
CC5
V
CCA
GND
PBR
SRST
RST
RST
8
7
6
5
PUSHBUTTON
RESET
R
PU
VOLTAGE (1V/DIV)
RST
PCI
LOCAL
BUS
U
Power Fail Waveform
5V Dropping Below 3.3V by 300mV
V
CC5
= 5V TO 3V STEP
V
CC3
= V
CCA
= 3.3V
4.7k PULL-UP FROM
RST TO V
CC3
V
CC5
5
4
3
2
RST
1
0
TIME (20ns/DIV)
1536 TA02
U
U
1

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