PDF MSM58321 Data sheet ( Hoja de datos )

Número de pieza	MSM58321
Descripción	REAL TIME CLOCK/CALENDAR
Fabricantes	OKI
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No Preview Available ! ¡¡SemicondSucetormiconductor MSM58321 REAL TIME CLOCK/CALENDAR MSM58321 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 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. 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. 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) 1024 Hz XT RFB XT OSC BUSY STOP TEST N Rp Rp WRITE READ CS1 CS2 Rp Rp Rp Rp D0 D1 D2 D3 ADDRESS WRITE Rp 1 215 R BUSY R WRIETE 1 Hz TEST D E-F 1/60 Hz 1/3600 Hz \DATA BUS SWITCH 43 43 S1 S10 MI1 MI10 44 H1 H10 3 W 1 Hz WRITE 1/10 1/6 SECOND 1/10 1/6 MINUTE 1/12 or 1/24 HOUR 1/7 WEEK S1 S10 MI1 MI10 H1 H10 W READ CS TRI-STATE CONTROL ADDRESS ADDRESS LATCH DECODER S1 0 S10 1 MI1 2 MI10 3 H1 4 5 6 7 8 9 A B C D E-F H10 W D1 D10 MO1 MO10 Y1 Y10 D E-F DATA BUS TEST-P 44 4 D1 D10 MO1 MO10 1/10 1/3 DAY WRITE D1 D10 1/12 MONTH MO1 MO10 44 Y1 Y10 1/10 1/10 YEAR Y1 Y10 Rp = 200 k TYP 7 1 page ¡ Semiconductor (2) READ mode Rating Symbol CS setup time CS hold time Address setup time Address write pulse width Address hold time Read access time Read delay time Read inhibit time tCS tCH tAS tAW tAH tRA tDD tRI Note 1. tRA = 1 µs + CR ln ( VDD VDD – VIH min ) Condition – – – – – – – – MSM58321 Min. 0 0 0 0.5 0.1 – – 0 (VDD = 5V ±5%, Ta = 25°C) Typ. Max. Unit – – µs – – µs – – µs – – µs – – µs – see Note 1 µs – 1 µs – – µs H CS1 CS2 L D0 ~ D3 (ADDRESS/DATA) ADDRESS WRITE ,,,,,,,,, READ tRI DATA VALID tCS tAS tAW tRH tRA tDD ,,,,,,,, DATA INVALID ,,,,,,,,, tCH ,,,,,,,,,,, High Impedance ,,,,,,,,, ADDRESS DATA Read Cycle Note: ADDRESS WRITE and READ inputs are activated by the level, not by the edge. 11 5 Page ¡ Semiconductor MSM58321 Name XT XT Pin No. 14 15 Description Oscillator pin. A 32.768 kHz crystal oscillator, capacitor and trim capacitor for frequency adjustment are to be connected as shown in Figure 8 below. C1 GND or VDD XT RFB = 10 MΩ TYP XT RFB C2 RS MSM58321 RS = 200 kΩ typ X-TAL 32.768 kHz, The crystal impedance is 30 kΩ or less. Figure 8 If an external clock is to be used for MSM58321's oscillation source, the external clock is to be input to XT, while XT should be left open. Refer to the Figure 9 below. CMOS or +5V XT XT TTL MSM58321 Figure 9 VDD 16 Power supply pin. Refer to the application circuit. 17 11 Page

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