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MSM58321 Datasheet(PDF) 1 Page - OKI electronic componets |
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MSM58321 Datasheet(HTML) 1 Page - OKI electronic componets |
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1 / 16 page  ¡ Semiconductor MSM58321 7 DESCRIPTION The MSM 58321 is a metal gate CMOS Real Time Clock/Calendar with a battery backup function for use in bus-oriented micropro- cessor applications. The 4-bit bidirectional bus line method is used for the data I/O circuit; the clock is set, cor- rected, or read by accessing the memory. ¡ Semiconductor MSM58321 REAL TIME CLOCK/CALENDAR The time is read with 4-bit DATA I/O, AD- DRESS 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 XT XT BUSY STOP TEST WRITE READ CS1 CS2 D0 D1 D2 D3 RFB OSC 215 1 R BUSY R 5-poststage (O11~O15) 1024 Hz 1 Hz 1/60 Hz 1/3600 Hz \DATA BUS 3 N TEST D E-F SWITCH 1 Hz WRITE S1 S10 1/10 1/6 SECOND MI1 MI10 1/10 1/6 MINUTE H1 H10 1/12 or 1/24 HOUR W 1/7 WEEK 43 4 43 4 WRIETE S1 S10 MI1 MI10 H1 H10 W Rp Rp Rp Rp Rp Rp READ CS DATA BUS TEST-P 44 4 4 4 WRITE D1 D10 1/10 1/3 DAY MO1 MO10 1/12 MONTH Y1 Y10 1/10 1/10 YEAR D1 D10 MO1 MO10 Y1 Y10 Rp = 200 k TYP TRI-STATE CONTROL ADDRESS LATCH Rp ADDRESS WRITE 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 |
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