M41T315Y M41T315V, M41T315W Serial access phantom RTC supervisor Not For New Design Features 3.0V, 3.3V, or 5V operating voltage Real-time clock keeps track of tenths/hundredths of seconds, seconds, minutes, hours, days, date of the month, months, and years 16 Automatic leap year correction valid up to 2100 1 Automatic switch-over and deselect circuitry Choice of power-fail deselect voltages: SO16 (MQ) (V = power-fail deselect voltage) PFD (a) M41T315Y : V = 4.5 to 5.5V CC 4.25V V 4.50V PFD M41T315V: V = 3.0 to 3.6V CC 2.80V V 2.97V PFD M41T315W: V = 2.7 to 3.3V SNAPHAT (SH) CC 2.60V V 2.70V battery & crystal PFD No address space required to communicate with RTC Provides nonvolatile supervisor functions for battery backup of SRAM Full 10% V operating range CC Industrial operating temperature range (40 to +85C) 28 Ultra-low battery supply current of 500nA (max) 1 Optional packaging includes A 28-lead SOIC and SNAPHAT top (to be ordered separately) SOH28 (MH) SNAPHAT package provides direct connection for a snaphat top, which contains the battery and crystal RoHS compliant Lead-free second level interconnect a. Contact local ST sales office for availability. November 2007 Rev 3 1/30 This is information on a product still in production but not recommended for new designs. www.st.com 1 Obsolete Product(s) - Obsolete Product(s)Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s)Contents M41T315Y, M41T315V, M41T315W Contents 1 Description . 5 2 Operation . 10 2.1 Non-volatile supervisor operation . 11 2.2 Data retention 14 3 Clock operation 16 3.1 Clock register information . 16 3.2 AM-PM/12/24 mode . 16 3.3 Oscillator and reset bits 16 3.4 Zero bits 16 4 Maximum rating 18 5 DC and AC parameters 19 6 Package mechanical data 22 7 Part numbering 27 8 Revision history . 29 2/30 Obsolete Product(s) - Obsolete Product(s)Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s)