MSM58321

¡ Semiconductor MSM58321 ¡ Semiconductor REAL TIME CLOCK/CALENDAR DESCRIPTION The MSM 58321 is a metal gate CMOS Real Time Clock/Calendar with a battery backup function for use in bus-oriented microprocessor applications. The 4-bit bidirectional bus line method is used for the data I/O circuit; the clock is set, corrected, or read by accessing the memory. MSM58321 The time is read with 4-bit DATA I/O, ADDRESS WRITE, READ, and BUSY; it is written with 4-bit DATA I/O, ADDRESS WRITE, WRITE, and BUSY. FEATURES 7 Function-Second, Minute, Hour, Day, Day-of-Week, Month, Year Automatic leap year calender 12/24 hour format Frequency divider 5-poststage reset Reference signal output 32.768 kHz crystal controlled operation Single 5V power supply Back-up battery operation to VDD = 2.2V Low power dissipation 90 µW max. at VDD = 3V 2.5 mW max. at VDD = 5V 16 pin plastic DIP (DIP 16-P-300) FUNCTIONAL BLOCK DIAGRAM 5-poststage (O11~O15) XT XT BUSY N STOP Rp TEST Rp WRITE Rp READ Rp CS1 Rp CS2 Rp D0 D1 D2 D3 TRI-STATE CONTROL ADDRESS LATCH ADDRESS DECODER 0 1 2 3 4 5 6 7 8 9 A B C D E-F S1 S10 MI1 MI10 H1 H10 W D1 D10 MO1 MO10 Y1 Y10 D E-F 1024 Hz 1 Hz 1/60 Hz 1/3600 Hz \DATA BUS 4 E-F 4 SWITCH S1 S10 1/10 1/6 3 4 MI1 MI10 1/10 1/6 MINUTE 3 H1 H10 1/12 or 1/24 W 1/7 WEEK RFB 1 OSC 215 R BUSY R 4 3 TEST D WRIETE 1 Hz WRITE S1 S10 MI1 MI10 H1 H10 W SECOND HOUR READ CS 4 D1 D10 1/10 1/3 DAY WRITE D1 D10 MO1 MO10 Y1 Y10 DATA BUS TEST-P 4 4 MO1 MO10 4 Y1 Y10 ...