R&E International
RE46C108
Piezoelectric Horn Driver with Voltage Regulator
Product Specification
Telephone 610.992.0727 Facsimile 610.992.0734 E-mail:rande@randeint.com
Page 1 of 4 DS-RE46C108-102402
General Description
The RE46C108 is a piezoelectric horn driver
with a voltage regulator that can operate at
3.3V or 5V. It is intended for applications
requiring a 9V horn driver with a low voltage
logic supply. The horn feedback control pin
is designed for use with self-oscillating
piezoelectric horn but can also be used in
direct drive applications.
Applications
Smoke detectors
CO Detectors
Personal Security Products
Electronic Toys
Features
Low Quiescent Current
Low Horn Driver Ron
Voltage Regulation to 3.3V or 5V
Available in DIP and SOIC packaging
Pin Configuration
REGSEL
VDD
REGOUT
FEED
HRNEN
HORNS
HORNB
VSS
1
8
Absolute maximum ratings
Supply Voltage Vdd ......................................................-.5V to +14V
Input voltage Range Vin ............................................... -.3V to VDD+.3V, except FEED
FEED Input Voltage Range Vinf .................................... -10V to +22V
Input Current Iin .......................................................... 10mA, except FEED
Operating Temperature ................................................ -40 to 85
C
Continuous Output Current (HornS, HornB) ..................... 30mA
Continuous Output Current (REGOUT) ........................... 55mA
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are
stress ratings only and operation at these conditions for extended periods may affect device reliability.
This product utilizes CMOS technology with static protection; however proper ESD prevention procedures should be
used when handling this product. Damage can occur when exposed to extremely high static electrical charges
R&E International
RE46C108
Piezoelectric Horn Driver with Voltage Regulator
Product Specification
Telephone 610.992.0727 Facsimile 610.992.0734 E-mail:rande@randeint.com
Page 2 of 4 DS-RE46C108-102402
Electrical Characteristics at TA = 25
C, VDD = 9V, Vss = 0V (unless otherwise noted).
Parameter
Test
Pin
Test Conditions
Limits
Min Typ Max
Units
Supply Voltage
Vdd
Operating
6.0 9.0 13.8
V
Standby Supply
Current
Vdd
Hrnen=Vss; No Loads
4
uA
Input Leakage
Hrnen,Resel
Vin=Vdd or Vss
-100 100
nA
FEED
Feed = +22V
20 50
uA
FEED
Feed = -10V
-50 -15
uA
Input Voltage Low
Hrnen,
Regsel
1.0
V
Input Voltage High
Hrnen,
Regsel
2.3
V
Output Low Voltage
Horns or
Hornb
Iout=16mA; Vdd=9V
Vdd=7.2V
0.3 0.5
0.9
V
V
Output High Voltage
Horns or
Hornb
Iout=-16mA; Vdd=9V
Vdd=7.2V
8.5 8.7
6.3
V
V
Regulator Voltage
Regout
Iout<50mA; Regsel=Vdd
Iout<50mA; Regsel=Vss
Iout<5mA; Regsel=Vss
T
A
=-40 to 85
C
See note #3
4.75 5.0 5.25
3.14 3.3 3.47
3.17 3.3 3.43
V
V
V
Line Regulation
Regout
6V<Vdd<12V; No load
30
mV
Load Regulation
Regout
0mA<Iout<50mA
100
mV
Brown-Out Threshold
Voltage
*See note #1
Vdd
Regsel=Vdd or Vss
Falling edge of Vdd
4.5 5.0 5.5
V
Brown-Out Pull Down
Current
Regout
Vdd=4.5V; Regout=2V
15 25
mA
Regout Overvoltage
Clamp
*See note #2
Regout
Regsel=Vdd; Iout > 1mA
Regsel=Vss; Iout > 1mA
5.5 6.0 6.5
3.7 4.0 4.3
V
V
Notes:
1/ The brown-out threshold voltage is the Vdd voltage at which the regulator will be disabled and
Regout will be pulled to Vss.
2/ In normal operation, the regulator will provide high-side current of up to 50mA, but current
sinking capability is typically under 1uA. The overvoltage clamp is intended to limit the voltage at
Regout when it is pulled up by an external source.
3/ The limits shown are 100% tested at 25C only. Test limits are guard-banded based on
temperature characterization to guarantee compliance at temperature extremes.
R&E International
RE46C108
Piezoelectric Horn Driver with Voltage Regulator
Product Specification
Telephone 610.992.0727 Facsimile 610.992.0734 E-mail:rande@randeint.com
Page 3 of 4 DS-RE46C108-102402
Typical Application
Functional Block Diagram
Bandgap
Reference
Output
Adjust
2
4
3
1
8
7
6
5
VDD
VSS
REGSEL
REGOUT
HRNEN
HORNB
HORNS
FEED
Clamp &
Shutdown
Circuit
R&E International
RE46C108
Piezoelectric Horn Driver with Voltage Regulator
Product Specification
Telephone 610.992.0727 Facsimile 610.992.0734 E-mail:rande@randeint.com
Page 4 of 4 DS-RE46C108-102402
R&E INTERNATIONAL, Inc. reserves the right to make changes without further notice to any
products herein to improve reliability, function or design.
R&E INTERNATIONAL, Inc. does not assume any liability arising out of the application or use
of any product or circuit described herein; neither does it convey any license under its patent
rights, nor the rights of others.
R&E INTERNATIONAL, Inc. products are not authorized for use as critical components in life
support devices or systems without the express written approval of the President of R&E
INTERNATIONAL, Inc. Life support devices or systems are devices or systems which are
intended for surgical implant into the body to support or sustain life, and whose failure to
perform, when properly used in accordance with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury to the user. A critical component is any
component of a life support device or system whose failure to perform can be reasonably
expected to cause the failure of the life support device or system, or to affect its safety or
effectiveness.
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