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LTC1536CS8#TRPBF

P1-P3P4-P6P7-P9P10-P12
1
LTC1536
1536fa
Precision Triple Supply Monitor
for PCI Applications
1
2
3
4
8
7
6
5
V
CC3
V
CC5
V
CCA
GND
PBR
SRST
RST
RST
LTC1536
PUSHBUTTON
RESET
PCI
LOCAL
BUS
R
PU
SELECTED TO MEET RISE TIME
SLEW RATE REQUIREMENTS (1k MIN)
5V ± 5%
3.3V ± 0.3V
0.1µF
R
PU
RST
1536 TA01
PWR GOOD
0.1µF
Motherboard PCI RST Generation
TIME (20ns/DIV)
VOLTAGE (1V/DIV)
5
4
3
2
1
0
1536 TA02
V
CC5
= 5V TO 3V STEP
V
CC3
= V
CCA
= 3.3V
4.7k PULL-UP FROM
RST TO V
CC3
RST
V
CC5
Power Fail Waveform
5V Dropping Below 3.3V by 300mV
■
Simultaneously Monitors 5V, 3.3V and
Adjustable Inputs
■
Guaranteed Threshold Accuracy: ±0.75%
■
Low Supply Current: 100µA
■
Internal Reset Time Delay: 200ms
■
Manual Pushbutton Reset Input
■
Active Low and Active High Reset Outputs
■
Active Low “Soft” Reset Output
■
Power Supply Glitch Immunity
■
Guaranteed Reset for Either V
CC3
≥ 1V or V
CC5
≥ 1V
■
Meets PCI t
FAIL
Timing Specifications Rev 2.1
■
8-Pin SO and MSOP Packages
The LTC
®
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 100µA typical supply current
makes the LTC1536 ideal for power-conscious systems.
A manual pushbutton reset input provides the ability to
generate a very narrow “soft” reset pulse (100µs 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.
■
PCI-Based Systems
■
Desktop Computers
■
Notebook Computers
■
Intelligent Instruments
■
Portable Battery-Powered Equipment
■
Network Servers
DESCRIPTIO
U
FEATURES
APPLICATIO S
U
TYPICAL APPLICATIO
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
2
LTC1536
1536fa
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
Terminal Voltage
V
CC3
, V
CC5
, V
CCA
.................................... – 0.3V to 7V
RST, SRST ............................................ – 0.3V to 7V
RST ......................................... –0.3V to V
CC3
+ 0.3V
PBR .......................................................... –7V to 7V
Operating Temperature Range
LTC1536C .............................................. 0°C to 70°C
LTC1536I............................................ –40°C to 85°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
WU
U
PACKAGE
/
O
RDER I FOR ATIO
ORDER PART NUMBER
ORDER PART NUMBER
LTC1536CMS8
1
2
3
4
8
7
6
5
TOP VIEW
S8 PACKAGE
8-LEAD PLASTIC SO
V
CC3
V
CC5
V
CCA
GND
PBR
SRST
RST
RST
T
JMAX
= 125°C, θ
JA
= 150°C/W
1
2
3
4
V
CC3
V
CC5
V
CCA
GND
8
7
6
5
PBR
SRST
RST
RST
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 125°C, θ
JA
= 160°C/W
MS8 PART MARKING
LTBV
S8 PART MARKING
1536
1536I
LTC1536CS8
LTC1536IS8
(Notes 1, 2)
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
RT3
Reset Threshold V
CC3
0°C ≤ T
A
≤ 70°C ● 2.962 2.985 3.000 V
–40°C ≤ T
A
≤ 85°C ● 2.925 2.985 3.008 V
V
RT5
Reset Threshold V
CC5
0°C ≤ T
A
≤ 70°C ● 4.687 4.725 4.750 V
–40°C ≤ T
A
≤ 85°C ● 4.625 4.725 4.762 V
V
RTA
Reset Threshold V
CCA
0°C ≤ T
A
≤ 70°C ● 0.992 1.000 1.007 V
–40°C ≤ T
A
≤ 85°C ● 0.980 1.000 1.007 V
V
CC
V
CC3
or V
CC5
Operating Voltage RST in Correct Logic State ● 17V
I
VCC3
V
CC3
Supply Current PBR = V
CC3
● 100 200 µA
I
VCC5
V
CC5
Input Current V
CC5
= 5V ● 10 20 µA
I
VCCA
V
CCA
Input Current V
CCA
= 1V ● –15 0 15 nA
t
RST
Reset Pulse Width RST Low with 10kΩ Pull-Up to V
CC3
0°C to 70°C ● 140 200 280 ms
– 40°C to 85°C
● 140 200 300 ms
t
SRST
Soft Reset Pulse Width SRST Low with 10kΩ Pull-Up to V
CC3
● 50 100 200 µs
t
UV
V
CC
Undervoltage Detect to RST V
CC5
, V
CC3
or V
CCA
Less Than Reset 13 µs
Threshold V
RT
by 1%
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC3
= 3.3V, V
CC5
= 5V, V
CCA
= V
CC3
unless otherwise noted.
3
LTC1536
1536fa
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
PBR
PBR Pull-Up Current PBR = 0V, 0°C ≤ T
A
≤ 70°C ● 3710 µA
PBR = 0V, –40°C ≤ T
A
≤ 85°C ● 3715 µA
V
IL
PBR, RST Input Low Voltage ● 0.8 V
V
IH
PBR, RST Input High Voltage ● 2V
t
PW
PBR Min Pulse Width ● 40 ns
t
DB
PBR Debounce Deassertion of PBR Input to SRST ● 20 35 ms
Output (PBR Pulse Width = 1µs)
t
PB
PBR Assertion Time for Transition PBR Held Less Than V
IL
, 0°C to 70°C ● 1.4 2.0 2.8 s
from Soft to Hard Reset Mode PBR Held Less Than V
IL
, –40°C to 85°C ● 1.4 2.0 3.0 s
V
OL
RST Output Voltage Low I
SINK
= 5mA ● 0.15 0.4 V
I
SINK
= 100µAV
CC3
= 1V, V
CC5
= 0V ● 0.05 0.4 V
0°C ≤ T
A
≤ 70°CV
CC3
= 0V, V
CC5
= 1V ● 0.05 0.4 V
V
CC3
= 1V, V
CC5
= 1V ● 0.05 0.4 V
I
SINK
= 100µAV
CC3
= 1.1V, V
CC5
= 0V ● 0.05 0.4 V
–40°C ≤ T
A
≤ 85°CV
CC3
= 0V, V
CC5
= 1.1V ● 0.05 0.4 V
V
CC3
= 1.1V, V
CC5
= 1.1V ● 0.05 0.4 V
SRST Output Voltage Low I
SINK
= 2.5mA ● 0.15 0.4 V
RST Output Voltage Low I
SINK
= 2.5mA ● 0.15 0.4 V
V
OH
RST Output Voltage High (Note 3) I
SOURCE
= 1µA ● V
CC3
– 1 V
SRST Output Voltage High (Note 3) I
SOURCE
= 1µA ● V
CC3
– 1 V
RST Output Voltage High I
SOURCE
= 600µA ● V
CC3
– 1 V
t
PHL
Propagation Delay RST to RST C
RST
= 20pF 25 ns
High Input to Low Output
t
PLH
Propagation Delay RST to RST C
RST
= 20pF 45 ns
Low Input to High Output
t
FAIL
V
CC5
or V
CC3
0.5V Undervoltage V
CC5
Drops Below 4.25V or V
CC3
Drops ● 150 450 ns
to RST (Note 4) Below 2.5V (Note 5)
t
PF
V
CC5
< (V
CC3
– 300mV) RST (Note 4) V
CC5
Drops Below V
CC3
By 300mV ● 50 90 ns
(Note 6)
Note 4: Conforms to PCI Local Bus Specification Rev 2.1,
Sect. 4.3.2 for t
FAIL
.
Note 5: V
CC3
or V
CC5
falling at –0.1V/µs, time measured from
V
RTX
– 500mV to RST at 1.5V.
Note 6: V
CC5
falling from 5V to 3V in ≤10ns, time measured from
V
CC5
= (V
CC3
– 300mV) to RST at 1.5V.
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: All voltage values are with respect to GND.
Note 3: The output pins SRST and RST have weak internal pull-ups to
V
CC3
of 6µA. However, external pull-up resistors may be used when faster
rise times are required.
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC3
= 3.3V, V
CC5
= 5V, V
CCA
= V
CC3
unless otherwise noted.
P1-P3P4-P6P7-P9P10-P12

LTC1536CS8#TRPBF

Mfr. #:
Buy LTC1536CS8#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Supervisory Circuits uP PCI-Compliant Triple Supply Monitor
Lifecycle:
New from this manufacturer.
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