DS1672-33+ Analog Devices

19-6032 Rev 9/11 DS1672 2 I C 32-Bit Binary Counter RTC GENERAL DESCRIPTION FEATURES The DS1672 incorporates a 32-bit counter and 32-Bit Counter 2 power-monitoring functions. The 32-bit counter I C Serial Interface is designed to count seconds and can be used to Automatic Power-Fail Detect and Switch derive time-of-day, week, month, month, and Circuitry year by using a software algorithm. A precision, Power-Fail Reset Output temperature-compensated reference and Low-Voltage Oscillator Operation comparator circuit monitors the status of V . (1.3V min) CC When an out-of-tolerance condition occurs, an Trickle-Charge Capability internal power-fail signal is generated that forces Underwriters Laboratories (UL) Recognized the reset to the active state. When V returns to -40C to +85C Operating Range CC an in-tolerance condition, the reset signal is kept in the active state for a period of time to allow PIN CONFIGURATION the power supply and processor to stabilize. TOP VIEW TYPICAL OPERATING CIRCUIT X1 1 8 V CC DS1672 X2 2 7 RST V 3 6 SCL BACKUP GND 4 5 SDA PDIP SO SOP . 1 of 15 DS1672 ORDERING INFORMATION PART TEMP RANGE VOLTAGE (V) PIN-PACKAGE TOP MARK* DS1672-2+ -40C to +85C 2.0 8 PDIP (300 mils) DS1672-2 DS1672-3+ -40C to +85C 3.0 8 PDIP (300 mils) DS1672-3 DS1672-33+ -40C to +85C 3.3 8 PDIP (300 mils) DS1672-33 DS1672S-2+ -40C to +85C 2.0 8 SO (150 mils) D1672-2 DS1672S-3+ -40C to +85C 3.0 8 SO (150 mils) D1672-3 DS1672S-33+ -40C to +85C 3.3 8 SO (150 mils) D167233 8 SO (150 mils)/Tape DS1672S-3+T&R -40C to +85C 3.0 D1672-3 and Reel 8 SO (150 mils)/Tape DS1672S-33+T&R -40C to +85C 3.3 D167233 and Reel 1672 DS1672U-2+ -40C to +85C 2.0 8 SOP(3mm) rr -2 1672 DS1672U-3+ -40C to +85C 3.0 8 SOP(3mm) rr -3 1672 DS1672U-33+ -40C to +85C 3.3 8 SOP(3mm) rr -33 1672 8 SOP(3mm)/Tape DS1672U-33+T&R -40C to +85C 3.3 rr -33 and Reel + Denotes a lead-free/RoHS-compliant device. * A + anywhere on the top mark denotes a lead-free device. rr = 2-digit alphanumeric revision code. 2 of 15