DATASHEET ICL7673 FN3183 Rev 5.00 Automatic Battery Back-Up Switch December 3, 2015 The Intersil ICL7673 is a monolithic CMOS battery backup Features circuit that offers unique performance advantages over Automatically Connects Output to the Greater of Either conventional means of switching to a backup supply. The Input Supply Voltage ICL7673 is intended as a low-cost solution for the switching of systems between two power supplies main and battery If Main Power to External Equipment is Lost, Circuit Will Automatically Connect Battery Backup backup. The main application is keep-alive-battery power switching for use in volatile CMOS RAM memory systems Reconnects Main Power When Restored and real time clocks. In many applications this circuit will Logic Indicator Signaling Status of Main Power represent a low insertion voltage loss between the supplies and load. This circuit features low current consumption, wide Low Impedance Connection Switches operating voltage range, and exceptionally low leakage Low Internal Power Consumption between inputs. Logic outputs are provided that can be used to indicate which supply is connected and can also be used Wide Supply Range: . 2.5V to 15V to increase the power switching capability of the circuit by Low Leakage Between Inputs driving external PNP transistors. External Transistors May Be Added if Very Large Currents Need to Be Switched Ordering Information Pb-Free Plus Anneal Available (RoHS Compliant) PART TEMP. RANGE PKG. NUMBER (C) PACKAGE DWG. Applications ICL7673CPA No 0 to 70 8 Ld PDIP E8.3 longer available On Board Battery Backup for Real-Time Clocks, or supported. Timers, or Volatile RAMs Recommended Replacement Over/Under Voltage Detector ICL7673CPAZ Peak Voltage Detector ICL7673CPAZ 0 to 70 8 Ld PDIP* E8.3 Other Uses: (See Note) (Pb-free) - Portable Instruments, Portable Telephones, Line ICL7673CBA No 0 to 70 8 Ld SOIC (N) M8.15 Operated Equipment longer available or supported. Pinout Recommended Replacement ICL7673 (SOIC, PDIP) ICL7673CBAZA-T TOP VIEW ICL7673CBAZA 0 to 70 8 Ld SOIC (N) M8.15 (See Note) (Pb-free) V 1 8 V O P ICL7673CBAZA-T 0 to 70 8 Ld SOIC (N) M8.15 V 2 7 NC S (See Note) (Pb-free) S 3 6 P BAR BAR *Pb-free PDIPs can be used for through hole wave solder GDN 4 5 NC 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. FN3183 Rev 5.00 Page 1 of 8 December 3, 2015ICL7673 Functional Block Diagram V V P O P1 V S P2 S BAR - + P BAR GND V > V , P1 SWITCH ON AND P SWITCH ON P S BAR V > V , P2 SWITCH ON AND S SWITCH ON S P BAR FN3183 Rev 5.00 Page 2 of 8 December 3, 2015