ICL7673_14 Datasheet, PDF (1/7 Pages) Intersil Corporation – Automatic Battery Back-Up Switch

®
Data Sheet
July 22, 2005
ICL7673
FN3183.4
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
PART
NUMBER
TEMP. RANGE
(°C)
PACKAGE
PKG.
DWG. #
ICL7673CPA
0 to 70 8 Ld PDIP
E8.3
ICL7673CPAZ
(See Note)
0 to 70
8 Ld PDIP*
(Pb-free)
E8.3
ICL7673CBA
0 to 70 8 Ld SOIC (N) M8.15
ICL7673CBA-T 8 Ld SOIC (N) Tape and Reel M8.15
ICL7673CBAZA
(See Note)
0 to 70
8 Ld SOIC (N) M8.15
(Pb-free)
ICL7673CBAZA-T
(See Note)
0 to 70
8 Ld SOIC (N) M8.15
(Pb-free)
*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.
Pinouts
ICL7673 (SOIC, PDIP)
TOP VIEW
V_O 1
V_S 2
S_BAR 3
GDN 4
8 V_P
7 NC
6 P_BAR
5 NC
Features
• Automatically Connects Output to the Greater of Either
Input Supply Voltage
• If Main Power to External Equipment is Lost, Circuit Will
Automatically Connect Battery Backup
• 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
Currents Need to Be Switched
• Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
• On Board Battery Backup for Real-Time Clocks,
Timers, or Volatile RAMs
• Over/Under Voltage Detector
• Peak Voltage Detector
• Other Uses:
- Portable Instruments, Portable Telephones, Line
Operated Equipment
Functional Block Diagram
V_P
P1
V_O
V_S
P2
S_BAR
-
+
P_BAR
GND
V_P > V_S, P1 SWITCH ON AND P_BAR SWITCH ON
V_S > V_P, P2 SWITCH ON AND S_BAR SWITCH ON
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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