59 real time clock module absolute max. rating specifications (characteristics) operating range frequency characteristics dc characteristics external dimensions (unit: mm) terminal connection no. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 4574sa gnd f out n.c n.c n.c n.c v dd ce 0 airq tirq clk data ce 1 f con 4574je v dd f out ce 0 airq tirq clk data ce 1 f con gnd n.c n.c n.c n.c n.c n.c n.c n.c n.c n.c 1234567 14 13 12 11 10 9 8 RTC-4574sa RTC-4574je r4574 847 6a e 7.4 0.2 3.2 0.1 1.2 1.27 0.35 5.0 10.1 0.2 0.15 0.6 0.05 min. 0? to 10? RTC-4574sa RTC-4574je (sop 14-pin) (vsoj 20-pin) r4574 9356b e 1.5 max. 5.4 1.3 (0.75) (0.75) 7.0 0.3 6.0 0.2 0.65 0.22 20 19 18 17 16 15 14 13 12 11 123456789 10 (v dd =1.6 to 5.5v,ta=-40 to +85?c) serial rtc module with alarm and timer functions rtc- 4574sa / je item power voltage clock voltage operating temperature symbol v dd v clk v opr condition min. 1.6 -40 max. 5.5 +85 unit v ?c item frequency tolerance frequency temperature characteristics frequency voltage characteristics oscillation start up time aging symbol d f/fo t op fv t sta fa condition ta=25?c, v dd =3v ta=-10 to +70?c, reference at 25?c ta=25?c,v dd =1.6 to 5.5v ta=25?c,v dd =1.6 v ta=25?c, v dd =3v range +10 -120 ? 3 ? unit ppm ppm/v s ppm/year item input voltage input leakage current pulldown r1 pulldown r2 output voltage 1 output voltage 2 leakage current standby current 1 standby current 2 symbol v ih v il i lk r dwn1 r dwn2 v oh1 v oh2 v oh3 v ol1 v ol2 v ol3 v ol4 v ol5 l oz i dd1 i dd2 v dd =5v v dd =3v v dd =5v v dd =3v v dd =5v v dd =3v v dd =5v v dd =3v v dd =5v v dd =3v ce 0 , ce 1 =gnd condition ce 0 ,ce 1, clk, data,f con pins v i =gnd or v dd ce 0 ,ce 1 , clk f con pins i oh =- 1ma data,f out pins i oh =- 1ma airq, tirq pins i oh =- 1ma data,f out pins min. 0.8v dd 0 -0.5 75 150 4.5 2.0 2.9 gnd -0.5 typ. 150 300 1.0 0.5 max. v dd 0.2v dd 0.5 300 600 5.0 3.0 gnd+0.5 gnd+0.8 gnd+0.1 gnd+0.25 gnd+0.4 0.5 2.0 1.0 unit v ? k w v ? built-in crystal unit allows adjustment-free efficient operation. ? serial interface which can be controlled by three signal lines. ? alarm interrupt function for day of week, day, hour, and minute. regular cycle interrupt function which can be set up between 1/4096 second and 255 minutes . ? dedicated interrupt output of the two systems (alarm and regular cycle) which allows software masking. ? ability to detect stopping of oscillation and time update. automatic adjustment for leap year. wide range of interface voltage between 1.6 and 5.5v. wide range of clock voltage between 1.6 and 5.5v. low power consumption at 0.5?/3v. (typ.) available in two small packages:sop14-pin and vsoj20-pin. this is mostly suited for high density mounting. actual size v o =gnd or v dd , data , airq, tirq pins item supply voltage input voltage output voltage storage temperature symbol v dd v in v out1 v out2 t stg condition input pin tirq ____ ,airq ____ f out, data min. -0.3 gnd-0.3 -55 max. +7.0 v dd +0.3v +8.0 v dd +0.3v +125 unit v ?c * equivalent to 1 minute of monthly deviation ce 0 pins v i =v dd i oh =- 100 a data,f out pins i oh =- 100 a data,f out pins data , airq, tirq pins 5?3
60 real time clock module switching characteristics block diagram register table timing chart bus interface circuit output controller divider f out tirq airq data clk f con ce1 ce0 clock and calendar time register alarm register control register shift register interrupts controller osc 32.768khz control line t ch t rf t rf t wl t clk t ds t dh d0 d1 d6 d7 d0 d6 d7 d0 d1 d6 d7 d0 d6 d7 t wz t rd t wh t cs t cr ce clk data data read data data write 50% 10% 90% 90% (write data) (read data) from here the data pin turns into the output mode. (setup code, setup address) (setup code, setup address) 10% 0 : always set this bit to ?? address register symbol 0 1 2 3 4 5 6 7 8 9 a b c d e f sec min hour week day month year minutes alarm hours alarm week alarm day alarm f out control timer interrupt control count down timer control 1 control 2 bit 7 fos fr fr fr fr fr year80 ae ae ae ae fe te timer128 0 0 bit 6 s40 min40 0 w7 0 0 year40 a-min40 * a-w7 * * * timer64 0 test bit 5 s20 min20 hour20 w6 day20 0 year20 a-min20 a-hr20 a-w6 a-day20 fd 4 td 1 timer32 0 stop bit 4 s10 min10 hour10 w5 day10 month10 year10 a-min10 a-hr10 a-w5 a-day10 fd 3 td 0 timer16 ti/tp reset bit 3 s8 min8 hour8 w4 day8 month8 year8 a-min8 a-hr8 a-w4 a-day8 * * timer8 af hold bit 2 s4 min4 hour4 w3 day4 month4 year4 a-min4 a-hr4 a-w3 a-day4 fd 2 * timer4 tf 0 bit 1 s2 min2 hour2 w2 day2 month2 year2 a-min2 a-hr2 a-w2 a-day2 fd 1 * timer2 aie 0 bit 0 s1 min1 hour1 w1 day1 month1 year1 a-min1 a-hr1 a-w1 a-day1 fd 0 * timer1 tie 0 item clk clock cycle clk h pulse width clk l pulse width ce setup time ce hold time ce recovery time write data setup time write data hold time write data disable delay time read data delay time output disable time rise and fall time fout duty ratio (32.768khz output) oscillation stop defection time symbol t clk t wh t wl t cs t ch t cr t ds t dh t wz t rd t rz t rf duty t osc control c l =50pf c l =50pf r l =10k min. 800 400 600 100 80 0 35 10 max. 300 200 100 65 min. 350 175 300 50 0 40 10 max. 120 100 50 60 unit ns % ms (gnd=0v,ta=-40?c to +85?c) v dd =3.0?0% v dd =5.0?0%
86 epson seiko epson corporation electronics device & components marketing div. 3f od bldg.421-8 hino,hino-shi,tokyo,191-8501 dec.28,1998 re :the year 2000 readiness disclosure for real time clock module dear valued customer: 1. our rtc products do not have counters of the four-digit year. 2. in other words, there are two categories regarding the counter construction. a: year counter consists of the bottom two digits of the four-digit year .(rtc shown in appendix a) or b: year counter consists of one digit and it is available with zero to three (ie,0,1,2,3) (rtc shown in appendix b) this counter is incremented every year (it will go to 0 after 3). initial setting of the year counter is required as follows; leap year ; set "0" to the year counter leap year +1 ; set "1" leap year +2 ; set "2" year before leap year ; set "3" 3. the years having multiples of four or having 00 are recognized as a leap year. (rtc shown in appendix a ) 4. the years having 0 in the year counter are recognized as a leap year.(rtc shown in appendix b) 5. for your information, year 2000 is a leap year, however, 1900 or 2100 is not a leap year. (usually, multiples of a hundred is not a leap year, but a leap year comes every 400 years.) in terms of a leap year recognition, our rtc products will work correctly until 2099. you are requested to prepare for so-called year 2000 issue by yourself in conjunction with the above rtc products. you need to make or modify your own program algorithm accordingly based on the above information. if you do not, the above rtc products may not work appropriately. if you have any questions regarding this matter, please contact a nearest sales office or representatives appendix a rtc45xx,rtc58xxx,rtc62xxx,rtc63xxx,rtc64xxx,rtc65xxx,rtc72xxx series and rtc8563 appendix b rtc-8583,rtc8593 sincerely yours, y2k project electronics device & components marketing div. this letter is to inform you of the operation of our real time clock module (rtc) products with respect to so-called year 2000 issue. please refer to the following information. in addition, information concerning year 2000 readiness disclosed herein constitutes a year 2000 readiness disclosure as that term is defined in the year 2000 information and readiness disclosure act, u.s. p.l. 105-271. nothing in this disclosure shall be deemed to amend the terms of any contract or warranty unless otherwise expressly agreed by seiko epson corporation.
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