RTC72421 ETC | Alldatasheet
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4-bit REAL TIME CLOCK MODULE D> <> RTC-72421 / 12423 a > au t @ The built-in quartz crystal makes regulation unnecessary and allows for easy design . joe wae yal <, as ®@ Direct bus-compatibility (120 ns. access time) Sean its AL Wg ey” @ ALE INPUT terminal available for 8048, 8051, and 8085 series ioe i Wei ae @ Incorporates built-in Time (hour, minute, second), and Date (year, month, week, day) counters ie — » ee @12H/24H clock switchover function and automatic leap year setting ) a a @ Interrupt masking a @30 seconds error adjustment function @ READ, WRITE, HOLD, STOP, RESET, and CHIP SELECT INPUTS “RTC _ | @ Low current consumption and features a backup function feacg 3120 Specifications (characteristics) Absolute Maximum Rating i Terminal Connection Input and output voltage Ta=25'C | GND -03to Vo +03 Sonanooooo 2 Se 7 oe + RTC-72421 c ALE 16 Woo Storage temperatura ss [—pTe-79493 5 Fa 6 an 1 the 18 ) Under 260°C within 10 6 A. 13 D, if: 8 RO 11. Ds Soldering condition Tsou Under 260°C within 10 sec Xup | 2 3 4 5 6 7? 8 9 9 GND 10. WR RTC-72423 to 2 times or under 230°C within min . @RTC-72423 be 23 Wo) Operating Range 24 23 22 21 20 19 18 17 16 I5 14 13 3 NC 22 (Vov) [Operating voltage | Moo (| | 4 StS. V 6NC 19 = RTC-72421 —10 to 70 > ASRTC aN ° 17 NC RTCA TOA o T2423A 1151 ar Data holding voltage Von 2.00 5.5 Nm ao vorta TOUDCOUUOUUOL HAD 14 CSi data holding time Refer to the data S i 23 65 67 8 ¥ WI 2 ° restoring time | te | holding timing # on) IS ° be are eve ore aee as of Vpp Do not connect it to any external terminals Operation Is Not conne Imematly W@Frequency characteristics and current consump- ; 7242tA er ra25¢ 722 pees ose en ee ee a 762 Frequency temperature —10 to +70°C +10/—120 characteristics (25°C reference temperature) xe7tT [CC | uz =6V, Ta= SIV EGA OAR AO gd vse Aging] ft] tye | ES MAX. [ppm/Y’ =1\\ 0 6MAX op at of 8 | * . ar rom m S cman cmamaton | im _).C8=0v OM r| “8 WeElectrical Characteristics _— @ RTC-72423 “HI input voltage (1) | Vin | —— | 22 |-| — | y | atoms 63 “input vote) | Vis | —— [| - || 08] | & Pen mrerr: input oak curert (| bs] yy, py| || CTEEEEEEEEE V,=Vpp/OV uA Pe to: input ak ourent @) [hn | YT | a0 "output votage (| Vou. lin=25mal - |-| 04] ) | oan, ; =f [HP output voltage — | Vou |lv=-400~a| 24 | - | — | | “L output voltage (2) | Vor. [lx=25mA] — |-| 04 | V_ HABER AE REE OFF leak current Vi=Vo/OV| - | - | 10 | ZA | Input capacity C, | reavency oF g eee ee a Von =2 to 5.5V V “L" input voltage (2) | = | = | 1/5¥e0 — 47 —
WFunction Table MiWRITE mode (with ALE) “BESCC ESESESES Gel Ae Fie | tS cs ; Vinnie si Vint sD OO | OTE F Se, | ss | & | S& | & | Oto9 | 1-second digit register CS, tsi sutstca-abrtMaLe a thee s1) TFOPO TOT HES] * | Sw | Sm | Si | 005 | 10-second digit register Ae to Ay - PaO [SET € Mba + | mio | min | min | Ot05 | 10-minute digit regster vate SlabsfelFfial «puts. [m [282 [mmomenrmem| | “= A 2 ee re 0 to 1 WR Vin aN eect po te oe 1-day digit register 1 -— fsua-ate PTD bl Filet Fro | «| | deo | dio | Oto3 | 10-day digit register _ {vn Ta iM EGS omMOd mo, | mo, | mo, | mo, | 0109 |T-month digit register ~ vs ‘ 9 | ea FO 1 fe [x [+ [mow | 0 t01 [10-month digit register CIE) CEST 0 to.9 | 10-year digit register SY Pet POLS (ae « | w | we | wi | Oto6 | Week register tng 1°41 gel-4 dita] SOSeC | IRQ - . tit (| 1 di ADJ | FLAG | BUSY | HOLD | Control Rigister D MIREAD mode (with ALE) MOT ake big | pe an ITRPT ; | el + i ar TEST | 24/12 | STOP | REST = Control Register F Vines Vine 919 ul tf cs, ter cc sitet cA-ALeoth¢al &-a) %#0="L" revel, 1="H" revel, REST=RESET ITRPT/STND =INTERRUPT/STANDARD 1 — 1) Bit x does not exist = eve TT hye 2) Please mask AM/PM bit with 10's of hours operations. : WALID 3) Busy is read only. IRQ can only be set low ( “0” ) Sk 4) Vi , ee es a we " Po Taw C‘CR]YN’NAnn'—~=CézC = 5) TEST bit should be “0”. tense vn WiSwitching Characteristics (with ALE) tren opamp be eftersinne (Please connect ALE to Vpp if the microprocessor does not have an ALE OUTPUT) Ds~Ds < eS ee SS ee PALE Sot eTmepBeore WATE tes isu of miData Holding Timing tuum | | 0 | Vpn bees | 1000 | — CS, or WR not occurred ? emma READ/WRITE Recovery Time” | 200 | - (Vpp=5V +0.5V) HIBlock Diagram RD WR CS, ALE CSO Ap Ar Ad As D BO DB. OD, o[]ho , STD«P fared (ed aad Foal ADDRESS DECODER ~? CARRY PER a CARRY etn ORY ete a ee ee f} of] f f ¢ f f ff ff ff jy yy Ty yyy ‘yl dsp eet fl ¢] ¢T fe Ft ve Fe vy Tl Ch £ a fj Seconds Minutes Hours Days Months Years ' LL Min |} Min 10} Hou |} Hou 10! Day |} Day 10) Mon | |Mon |0] Yea || Yea 10 Reg D Reg E Reg F A A A AR AR RO RR ED [F a = — 48 —