SG3546 Datasheet, PDF (1/7 Pages) Microsemi Corporation – 3.3 V UNDERVOLTAGE SENSING CIRCUIT

T H E I N F I N I T E P O W E R O F I N N O VAT I O N
L I N D O C #: 3546
SG3546
3 . 3 V UNDERVOLTAGE S ENSING C IRCUIT
PR O D U C T I O N D ATA S H E E T
DESCRIPTION
The SG3546 is an undervoltage sensing
circuit specifically designed for use as
a reset controller in 3.3V
microprocessor-based applications. Its
micropower operation makes this
device ideal for portable applications
where extended battery life is required.
The device offers a 1.2V temperature
compensated bandgap reference, a
precision comparator with hysteresis
and a high-current open collector
output. This device operates from 1 to
10V input supply and drains <10µA in
the non-fault condition.
The SG3546 is available in an 8-pin
150mil SOIC package or a 3-pin TO-92
package and is rated for an ambient
temperature of 0°C to 70°C.
PRODUCT HIGHLIGHT
LOW-VOLTAGE MICROPROCESSOR RESET
2
POWER
SUPPLY
R
1
RESET MICROPROCESSOR
CIRCUIT
C_DLY
KEY FEATURES
s LOW STANDBY CURRENT
s INTERNAL VOLTAGE THRESHOLD AT 2.95V
s TEMPERATURE COMPENSATED BANDGAP
REFERENCE
s PRECISION COMPARATOR WITH 40MV OF
HYSTERESIS
s CLAMP DIODE FOR DISCHARGING DELAY
CAPACITOR
s OUTPUT CURRENT SINK CAPABILITY
(typ 5mA)
s 1-10V INPUT SUPPLY RANGE
s AVAILABLE IN 150MIL, 8-PIN SOIC AND
3-PIN TO-92 PACKAGES
1.2 V_REF
3
PA C K A G E O R D E R I N F O R M AT I O N
T_A (°C)
DM
Plastic
8-pin
SOIC
LP
Plastic
3-pin
TO-92
0 to 70
SG3546DM
SG3546LP
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. SG3546DMT)
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Copyright © 1994
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841
1
Rev. 1.3 1/96