LTC1536CMS8#PBF Linear Technology, LTC1536CMS8#PBF Datasheet

IC PREC TRPL SPPLY MONITOR 8MSOP

LTC1536CMS8#PBF

Manufacturer Part Number
LTC1536CMS8#PBF
Description
IC PREC TRPL SPPLY MONITOR 8MSOP
Manufacturer
Linear Technology
Type
Multi-Voltage Supervisorr
Datasheet

Specifications of LTC1536CMS8#PBF

Number Of Voltages Monitored
3
Output
Open Drain or Open Collector
Reset
Active High/Active Low
Reset Timeout
140 ms Minimum
Voltage - Threshold
2.985V, 4.725V, Adj
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Voltage Supervisor Type
Voltage Monitor
Number Of Voltage Supervisors
3
Monitored Supervisor Voltage
2.985/4.725/Adj
Operating Supply Voltage (min)
1V
Operating Supply Voltage (max)
7V
Package Type
MSOP
Operating Temperature Classification
Commercial
Operating Temp Range
0C to 70C
Pin Count
8
Mounting
Surface Mount
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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FEATURES
TYPICAL APPLICATIO
APPLICATIO S
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
Meets PCI t
8-Pin SO and MSOP Packages
PCI-Based Systems
Desktop Computers
Notebook Computers
Intelligent Instruments
Portable Battery-Powered Equipment
Network Servers
PWR GOOD
3.3V ± 0.3V
5V ± 5%
FAIL
0.1µF
0.1µF
Timing Specifications Rev 2.1
U
Motherboard PCI RST Generation
1
2
3
4
R
SLEW RATE REQUIREMENTS (1k MIN)
V
V
V
GND
PU
CC3
CC5
CCA
LTC1536
SELECTED TO MEET RISE TIME
CC3
U
SRST
PBR
RST
RST
≥ 1V or V
8
7
6
5
PUSHBUTTON
RESET
CC5
≥ 1V
R
RST
PU
Precision Triple Supply Monitor
DESCRIPTIO
The LTC
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
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
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.
All other trademarks are the property of their respective owners.
CC5
PCI
LOCAL
BUS
, LTC and LT are registered trademarks of Linear Technology Corporation.
1536 TA01
or V
®
CC3
1536 is designed for PCI local bus applications
down to 1V. The 100µA typical supply current
for PCI Applications
U
FAIL
5
4
3
2
1
0
5V Dropping Below 3.3V by 300mV
timing specification. Tight 0.75%
Power Fail Waveform
V
CC5
TIME (20ns/DIV)
V
V
4.7k PULL-UP FROM
RST TO V
CC5
CC3
RST
= 5V TO 3V STEP
= V
LTC1536
CCA
CC3
= 3.3V
1536 TA02
1536fa
1

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LTC1536CMS8#PBF Summary of contents

Page 1

... 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. All other trademarks are the property of their respective owners. PUSHBUTTON R ...

Page 2

LTC1536 BSOLUTE Terminal Voltage .................................... – 0. CC3 CC5 CCA RST, SRST ............................................ – 0. RST ......................................... – 0. PBR .......................................................... – ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL PARAMETER I PBR Pull-Up Current PBR V PBR, RST Input Low Voltage IL V PBR, RST Input High Voltage IH t PBR Min Pulse Width PW t PBR Debounce DB ...

Page 4

LTC1536 W U TYPICAL PERFORMANCE CHARACTERISTICS I vs Temperature VCC3 140 120 100 – 45 – 25 – TEMPERATURE (°C) 1536 G01 V Threshold Voltage CC5 vs Temperature 4.750 4.745 ...

Page 5

W U TYPICAL PERFORMANCE CHARACTERISTICS V Typical Transient Duration CC3 vs Reset Comparator Overdrive 50 RESET OCCURS 45 ABOVE CURVE 0.001 0.01 0.1 V RESET COMPARATOR OVERDRIVE, V – V CC3 ...

Page 6

LTC1536 PIN FUNCTIONS V (Pin 1): 3.3V Sense Input and Power Supply Pin for CC3 the IC. Bypass to ground with ≥ 0.1µF ceramic capacitor. V (Pin 2): 5V Sense Input. Used as gate drive for RST ...

Page 7

DIAGRA S V Monitor Timing CC V RTX V CCX RST t Fast Undervoltage Detect FAIL SLEW RATE ≤0.1V/µs V RTX V CC3 OR V CC5 t FAIL RST U U APPLICATIONS INFORMATION Operation ...

Page 8

LTC1536 U U APPLICATIONS INFORMATION When the PBR is pulled low for less than t narrow (100µs typ) soft reset pulse is generated on the SRST output pin after the button is released. The push- button circuitry contains an internal ...

Page 9

U TYPICAL APPLICATIONS Triple Supply Monitor (3.3V, 5V and Adjustable) LTC1536 1 3.3V V CC3 CC5 ADJUSTABLE SUPPLY DC/DC FEEDBACK V CCA 4 DIVIDER R2 GND *OPTIONAL RESISTOR EXTENDS ESD TOLERANCE OF PBR INPUT ...

Page 10

LTC1536 PACKAGE DESCRIPTION 5.23 (.206) MIN 0.42 ± 0.038 (.0165 ± .0015) TYP RECOMMENDED SOLDER PAD LAYOUT 0.254 (.010) GAUGE PLANE 0.18 (.007) NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, ...

Page 11

... MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 12

... PBR CC3 SRST CC5 3 6 SYSTEM V RST CCA RESET 4 5 GND RST COMMENTS 4.65V Threshold 2.9V Threshold 4.65V Threshold 4.37V/4.62V Threshold 4.725V, 3.118V, 1V Thresholds (±0.75%) 2.363V, 3.118V, 1V Thresholds (±0.75%) LT 0106 REV A • PRINTED IN THE USA © LINEAR TECHNOLOGY CORPORATION 1997 1536fa ...

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