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| Real time clock module 4-bit REAL TIME CLOCK MODULE RTC-72421/72423 * * * * * * Built-in crystal unit allows adjustment-free efficient operation. ALE input terminal available for 8048, 8051, and 8085 series. 12/24 h clock switchover function and automatic leap year setting. Interrupt masking. 30 second adjustment function. Low current consumption and features a backup function. Actual size Specifications (characteristics) Absolute Max. rating Symbol Item VDD Power source voltage VI/O Input and output voltage Storage temperature TSTG Condition Ta=+25 C Ta=+25 C RTC-72421 RTC-72423 RTC-72421 Soldering condition TSOL RTC-72423 Specifications -0.3 to 7.0 GND -0.3 to VDD+0.3 -55 to +85 -55 to +125 Under +260 C within 10 s (lead part) (package should be less than +150 C) Terminal connection Unit V C RTC-72421 18 17 16 15 14 13 12 11 10 Twice at under +260 C within 10 s or under +230 C within 3 min. 1 2 3 4 5 6 7 8 9 Operating range Item Operating voltage Operating temperature Data holding voltage CSI data holding time Operation restoring time Symbol VDD TOPR VDH tCDR tR Refer to the data holding timing RTC-72421 RTC-72423 Condition Specifications 4.5 to 5.5 -10 to 70 -40 to 85 2.0 to 5.5 2.0 Min. Unit V C V s RTC-72423 24 23 22 21 20 19 18 17 16 15 14 13 No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 72421 STD. P CS0 ALE A0 A1 A2 A3 RD GND WR D3 D2 D1 D0 CS1 (VDD) (VDD) VDD 1 2 3 4 5 6 7 8 9 10 11 12 (VDD) and VDD are to have the same level of voltage. Do not connect it to any external terminals. NC is not connected internally. No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 72423 STD. P CS0 NC ALE A0 NC A1 NC A2 A3 RD GND WR D3 D2 D1 NC NC D0 CS1 NC (VDD) (VDD) VDD Frequency characteristics and current consumption characteristics Item Symbol Condition 72421 A Frequency tolerance f/fo Specifications 10 50 20 50 +10/-120 5 Max. 10 Max. 10 Max. 5 Max. Unit External dimensions RTC-72421 23.1 Max. (Unit: mm) Ta=+25 C 72421 B VDD=5 V 72423 A 72423 Aging Shock resistance Current consumption fa S.R. IDD1 IDD2 VDD=5 V, Ta=+25 C, first year Three drops on a hard board from 750 mm or 29400 m/s2 x 0.3 ms x 1/2 sine wave x 3 directions x 10-6/year x 10 A -6 4.2 0.2 Min. Frequency temperature characteristics (+25 C reference temperature) -10 C to +70 C 6.3 x 10-6 RTC72421 A EPSON 5053C 7.62 0.25 90 to 105 2.54 0.65 Max. CS1=0 V VDD=5 V Exclude input/ output current VDD=2 V DC characteristics Item "H" input voltage "L" input voltage (1) (1) Symbol Condition VIH1 VIL1 ILK1 ILK2 VOL1 VOH VOL2 IOFFLK C1 (2) (2) VIH2 VIL2 -- Min. Typ. Max. 2.2 -- 0.8 1 -- -- RTC-72423 Unit V A Applicable terminal All inputs other than CS1 Input other than D0 to D3 16.3 Max. Input leak current (1) Input leak current (2) "L" output voltage (1) "H" output voltage "L" output voltage (2) Off leak current Input capacity "H" input voltage 20 -- 1.27 0.35 2.8 Max. 77 "L" input voltage VDD=2 to 5.5 V 4/5 VDD -- -- 1/5 VDD V CS1 0.3 D0 to D3 0.2 frequency 1 MHz Input 10 pF Input other than D0 to D3 2.5 IOL=2.5 mA IOH=-400 A IOL=2.5 mA V1=VDD/0 V 0.4 2.4 -- 0.4 -- 10 A V D0 to D3 STD.P 0 to 10 0.05 Min. 7.9 10 12.2 Max. V1=VDD/0 V RTC72423 A EPSON 6150 3.3 Min. 1.0 Real time clock module Register table Address Register Data D3 s8 mi8 h8 D2 s4 s40 mi4 mi40 h4 D1 s2 s20 mi2 mi20 h2 h20 D0 s1 s10 mi1 mi10 h1 h10 Count Value Remarks VIH (CS1) VIH (CS1) Write mode (with ALE) A3 A2 A1 A0 0 0 0 0 0 0 0 0 0 1 0 0 1 1 0 0 1 2 3 4 5 6 7 8 9 A B C D E F 0 S1 1 S10 0 MI 1 1 MI10 0 H1 0 to 9 0 to 5 0 to 9 0 to 5 0 to 9 0 to 2 or 0 to 1 1- second digit register 10- second digit register 1- minute digit register 10- minute digit register 1- hour digit register PM/AM,10- hours digit register CS1 A0 to A3 CS0 tSU (CS1) tSU (A-ALE) tH (ALE-A) tH (CS1) VIH VIL VIH VIL tW VIH (ALE) ALE WR VIH VIL 0101 0 0 1 1 1 1 1 1 1 0 0 0 0 1 1 1 0 0 1 1 0 H10 PM/AM d4 mo4 y4 y40 w4 tSU (ALE-W) tW (W) tSU (W-ALE) d8 0 D1 1 D10 0 MO1 mo8 1 MO10 y8 0 Y1 1 Y10 y80 0W d2 d1 d20 d10 mo2 mo1 mo10 y1 y2 y20 y10 w2 w1 0 to 9 0 to 3 0 to 9 0 to 1 0 to 9 0 to 6 1- day digit register 10 -day digit register 1- month digit register 10- month digit register 1- year digit register 10- year digit register Week register Control Register D VIH VIL VIH VIH VIL tSU tSU (D-W) tH (R-ALE) (W-D) D0 to D3 VIH VIL 1 1 0 1 RegD 1 1 1 0 RegE 1 1 1 1 RegF 30 sec. IRQ ADJ FLAG BUSY HOLD Read mode (with ALE) t1 t0 ITRPT /STND MASK STOP REST ----- Control Register E Control Register F CS1 A0 to A3 CS0 VIH (CS1) VIH (CS1) TEST 24/12 0="L" level,1="H" level, REST = RESET ITRPT/ STND=INTERRUPT/STANDARD 1) Bit does not exist. 2) Please mask AM/PM bit with 10's of hours operations. 3) Busy is read only. IRQ can only. IRQ can only be set low ("O"). 24/12 Data Bit ITRPT/STND 4) PM/AM 1 0 PM AM ITRPT STND 24 12 tSU (CS1) tSU (A-ALE) tH (ALE-A) VIH VIL VIH VIL tH (CS1) tW VIH (ALE) ALE RD VIH VIL VIL (ALE-R) tSU tSU (R-ALE) VIH VIL VOH VOL VOH VOL 5) TEST bit should be "O". VIH VIL Switching characteristics (with ALE) (Please connect ALE to VDD if the microprocessor does not have an ALE output.) ( VDD = 5 V 0.5 V) Item CS1 setup time Address setup time before ALE Address hold time after ALE ALE pulse width ALE setup time before WRITE ALE setup time before READ ALE setup time after WRITE ALE setup time after READ WRITE pulse width DATA delay time after READ DATA Hold time after READ DATA setup time before WRITE DATA hold time after WRITE CS1 hold time READ/WRITE recovery time Symbol tSU (CS1) tSU (A-ALE) tPZV (R-Q) D0 to D3 trnc (R) tPVZ (R-Q) Condition tH (ALE-A) tW (ALE) tSU tSU tSU (ALE-W) (ALE-R) (W-ALE) tSU (R-ALE) tW (W) tPZV (R-Q) tPVZ (R-Q) tSU (D-W) CL=150 pF tH (W-D) tH (CS1) tREC (R/W) Min. Max. 1000 50 50 80 0 ---0 50 50 120 ---120 0 70 80 10 ---1000 200 Unit Data holding timing VDD 4V 2 to 4 V 4V ns CS1 VIH2 tCDR VIL2 CS1 1/5VDD Data storage mode tR VIH2 VIL2 Interface possible with the external terminals Interface possible with external terminals CS0 or WR not occurred Block diagram RD WR CS1 ALE CS0 A0 A1 A2 A3 D0 D1 D2 D3 OSC DIVIDER READ * WRITE CONTROL ADDRESS LATCH 4 DATA BUS * BUFFER REST STOP 30ADJ BUSY HOLD 64 HZ STD*P 4 4 CARRY PER SEC. CARRY PER MIN. CARRY PER HOUR IRQFLAG ADDRESS DECODER 4 4 Seconds Minutes Hours Days Months Years Sec 1 Sec 10 Min 1 Min 10 Hou 1 Hou 10 Day 1 Day 10 Mon 1 Mon 10 Yea 1 Yea 10 Week Reg D Reg E Reg F 24/12 78 |
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