ICL7673 Intersil Corporation, ICL7673 Datasheet

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ICL7673

Manufacturer Part Number
ICL7673
Description
Automatic Battery Back-Up Switch
Manufacturer
Intersil Corporation
Datasheet

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Automatic Battery Back-Up Switch
The Intersil ICL7673 is a monolithic CMOS battery backup
circuit that offers unique performance advantages over
conventional means of switching to a backup supply. The
ICL7673 is intended as a low-cost solution for the switching
of systems between two power supplies; main and battery
backup. The main application is keep-alive-battery power
switching for use in volatile CMOS RAM memory systems
and real time clocks. In many applications this circuit will
represent a low insertion voltage loss between the supplies
and load. This circuit features low current consumption, wide
operating voltage range, and exceptionally low leakage
between inputs. Logic outputs are provided that can be used
to indicate which supply is connected and can also be used
to increase the power switching capability of the circuit by
driving external PNP transistors.
Ordering Information
Pinouts
ICL7673CPA
ICL7673CPAZ
(See Note)
ICL7673CBA
ICL7673CBA-T
ICL7673CBAZA
(See Note)
ICL7673CBAZA-T
(See Note)
*Pb-free PDIPs can be used for through hole wave solder
processing only. They are not intended for use in Reflow solder
processing applications.
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are RoHS compliant and
compatible with both SnPb and Pb-free soldering operations. Intersil
Pb-free products are MSL classified at Pb-free peak reflow
temperatures that meet or exceed the Pb-free requirements of
IPC/JEDEC J STD-020.
NUMBER
PART
S
GDN
BAR
V
V
O
S
8 Ld SOIC (N) Tape and Reel
TEMP. RANGE
ICL7673 (SOIC, PDIP)
1
2
3
4
0 to 70
0 to 70
0 to 70
0 to 70
0 to 70
(°C)
TOP VIEW
®
1
8 Ld PDIP
8 Ld PDIP*
(Pb-free)
8 Ld SOIC (N)
8 Ld SOIC (N)
(Pb-free)
8 Ld SOIC (N)
(Pb-free)
Data Sheet
PACKAGE
8
7
6
5
V
NC
P
NC
P
BAR
E8.3
E8.3
M8.15
M8.15
M8.15
M8.15
DWG. #
PKG.
1-888-INTERSIL or 1-888-468-3774
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Features
• Automatically Connects Output to the Greater of Either
• If Main Power to External Equipment is Lost, Circuit Will
• Reconnects Main Power When Restored
• Logic Indicator Signaling Status of Main Power
• Low Impedance Connection Switches
• Low Internal Power Consumption
• Wide Supply Range: . . . . . . . . . . . . . . . . . . . 2.5V to 15V
• Low Leakage Between Inputs
• External Transistors May Be Added if Very Large
• Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
• On Board Battery Backup for Real-Time Clocks,
• Over/Under Voltage Detector
• Peak Voltage Detector
• Other Uses:
Functional Block Diagram
GND
V
V
Input Supply Voltage
Automatically Connect Battery Backup
Currents Need to Be Switched
Timers, or Volatile RAMs
- Portable Instruments, Portable Telephones, Line
P
S
Operated Equipment
All other trademarks mentioned are the property of their respective owners.
July 22, 2005
V
V
+
-
|
P
S
Intersil (and design) is a registered trademark of Intersil Americas Inc.
> V
> V
Copyright © Intersil Americas Inc. 1999-2005. All Rights Reserved
S
P
, P1 SWITCH ON AND P
, P2 SWITCH ON AND S
P1
BAR
BAR
P2
SWITCH ON
SWITCH ON
ICL7673
FN3183.4
V
S
P
O
BAR
BAR

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ICL7673 Summary of contents

Page 1

... The Intersil ICL7673 is a monolithic CMOS battery backup circuit that offers unique performance advantages over conventional means of switching to a backup supply. The ICL7673 is intended as a low-cost solution for the switching of systems between two power supplies; main and battery backup. The main application is keep-alive-battery power switching for use in volatile CMOS RAM memory systems and real time clocks ...

Page 2

... Operating Conditions Temperature Range: ICL7673C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. ...

Page 3

... INPUT VOLTAGE V FIGURE 1. ON-RESISTANCE SWITCH FUNCTION OF INPUT VOLTAGE 0.8 0.6 0.4 0 SUPPLY VOLTAGE (V) FIGURE 3. SUPPLY CURRENT AS A FUNCTION OF SUPPLY VOLTAGE 3 ICL7673 SYMBOL TEST CONDITIONS 0V 15V 0mA LPBAR P S LOAD +85° 15V 0V 0mA LSBAR ...

Page 4

... P FIGURE 5. I LEAKAGE CURRENT V S FUNCTION OF INPUT VOLTAGE Detailed Description As shown in the Functional Diagram, the ICL7673 includes a comparator which senses the input voltages V output of the comparator drives the first inverter and the open-drain N-Channel transistor P BAR drives a large P-Channel switch second inverter, and ...

Page 5

... V open drain output S Figure 12. For high power applications hysteresis can be applied as shown in Figure 13. 4 The ICL7673 can also be used as a clipping circuit as illustrated in Figure 14. With high impedance loads the circuit output will be nearly equal to the greater of the two input signals. 8 ...

Page 6

... FIGURE 13. HIGH CURRENT BACKUP SYSTEM WITH HYSTERESIS 6 ICL7673 R PNP 2 PNP (NOTE NOTE 4. > ICL7673 GND GND R PNP 2 PNP EXTERNAL EQUIPMENT W EXTERNAL EQUIPMENT FN3183 ...

Page 7

... However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 7 ICL7673 V O ICL7673 V S GND V O FIGURE 14. CLIPPLING CIRCUITS ...

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