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PDF CAT884 Data sheet ( Hoja de datos )
| Número de pieza | CAT884 | |
| Descripción | Quad Voltage Supervisor | |
| Fabricantes | ON Semiconductor | |
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CAT884
Quad Voltage Supervisor
Description
The CAT884 is a four−channel power supply supervisory circuit
with high accuracy reset thresholds and very low power consumption.
The device features an active−low open−drain output with manual
reset to perform basic system reset and voltage monitoring functions
for a wide range of electronic products.
CAT884 monitors four system voltages maintaining its reset output
active until all the power supply voltages exceed the specified
threshold values. The four threshold voltages are user controlled and
can be set for system specific requirements over a range of 0.635 V to
5.5 V using external resistor dividers.
The CAT884 lowers system costs and saves board space by
integrating four channels into a single, small SOIC 8−lead package
and operates over the industrial temperature range of −40°C to +85°C.
Features
• Quad Voltage Monitoring
• Adjustable Threshold Voltages down to 0.635 V with ±2% Accuracy
• Low Supply Current: 3 mA (typ)
• RESET Valid to VCC = 1 V
• Immune to Short Supply Transients
• Operating Temperature Range: −40°C to +85°C
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
• Monitoring of Multiple Power Supply Voltages in mP Based Systems
S1 S2 S3 S4
V+
V1 VDD
V2 RESET
V3 MR
V4 GND
Optional
mP
Reset
Manual
Reset
Figure 1. Typical Application Circuit
http://onsemi.com
SOIC−8
V SUFFIX
CASE 751BD
PIN CONNECTIONS
1
VDD
V1
RESET
V2
MR V3
GND
V4
(Top View)
MARKING DIAGRAM
884VYM
884V = Device Code
Y = Production Year (Last Digit)
M = Production Month: 1−9, A, B, C
ORDERING INFORMATION
Device
CAT884RVI−GT3
Package
SOIC−8
(Pb−Free)
Shipping†
3,000/
Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2010
October, 2010 − Rev. 0
1
Publication Order Number:
CAT884/D
1 page  
CAT884
Detailed Description
The CAT884 is a space−saving, low−power, quad voltage
microprocessor supervisory circuit designed monitor 4
voltage supplies.
Applications Information
Reset Output
CAT884 provides an active LOW system reset signal via
an open drain output which requires an external pull−up
resistor to an external power supply. This supply can be less
than or greater than VDD, but should not exceed 5.5 V. When
the external pull−up voltage is greater than VDD reverse
current flow from the external pull−up voltage to VDD is
prevented by CAT884’s internal circuitry.
VDD is also a monitored voltage in CAT884 with
thresholds set for 2.6 V rising and 2.4 V falling. When any
monitored supply drops below its threshold, the reset output
asserts LOW and remains LOW as long as VDD is above
1.0 V.
CAT884
3.3 V
V1 VDD
V2 RESET
V3
V4
5V
mP
RESET
Figure 7. Interfacing to Different Logic−Supply
Voltage
VDD
0
VMON
0
MR
0
RST
0
VPOR
1V
VTH
tRPD
tFIL
<tFIL
>TPW
tRD tMD
Figure 8. Operational Timing Diagram
tMR
http://onsemi.com
5
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet CAT884.PDF ] | |
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