Rainbow-electronics DS17287 Bedienungsanleitung PDF herunterladen (Seite 25)

DS17285/DS17287

25 of 38

DC ELECTRICAL CHARACTERISTICS Over the operating range (5V)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

Average V

Power Supply

Current

CC1

25 50 mA 1, 2

CMOS Standby Current

(

CS = V

- 0.2V)

CC2

1 3 mA 1, 2

Input Leakage Current

(Any Input)

-1 +1

Output Leakage Current I

-1 +1

Output Logic 1 Voltage

OUT

= -1.0mA)

2.4 V

Output Logic 0 Voltage

OUT

= -2.1mA)

0.4 V

Power-Fail Trip Point V

4.25 4.37 4.5 V 3

Battery-Switch Voltage V

BAT

BAUX

Battery Leakage OSC ON I

BAT1

0.50 0.7

Battery Leakage OSC OFF I

BAT2

0.050 0.4

I/O Leakage I

-1 +1

PWR Output at 0.4V

OLPWR

10.0 mA

IRQ Output at 0.4V

OLIRQ

2.1 mA

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 37 38

DS17285/DS17287 1
3V/5V Real-Time Clock 1
ORDERING INFORMATION 2
PIN DESCRIPTION 2
DESCRIPTION 2
OPERATION 3
SIGNAL DESCRIPTIONS 3
Figure 1. BLOCK DIAGRAM 5
DS17285 ONLY 6
RTC ADDRESS MAP 7
CONTROL REGISTERS 9
REGISTER A 9
LSB 9
REGISTER B 10
REGISTER C 11
REGISTER D 11
NV RAM–RTC 12
INTERRUPT CONTROL 12
PERIODIC INTERRUPT SELECTION 13
OSCILLATOR CONTROL BITS 13
SQUARE-WAVE OUTPUT SELECTION 13
FREQUENCY 14
UPDATE CYCLE 15
EXTENDED FUNCTIONS 16
Silicon Serial Number 16
Century Counter 16
RTC Write Counter 16
Auxiliary Battery 17
Wake-Up/Kickstart 17
goes below V 18
RAM Clear 19
4k x 8 Extended RAM 19
20 of 38 20
EXTENDED CONTROL REGISTERS 21
EXTENDED CONTROL REGISTER 4A 21
EXTENDED CONTROL REGISTER 4B 22
23 of 38 23
ABSOLUTE MAXIMUM RATINGS* 24
OPERATING RANGE 24
25 of 38 25
PWR Output at 0.4V 25
IRQ Output at 0.4V 25
CRYSTAL SPECIFICATIONS* 26
AC TEST CONDITIONS 27
29 of 38 29
29
30 of 38 30
CS High to Power-Fail 30
POWER-UP CONDITION, 3V 31
POWER-DOWN CONDITION, 3V 31
POWER-UP CONDITION, 5V 32
POWER-DOWN CONDITION, 5V 32
WAKE-UP/KICKSTART TIMING 33
BURST MODE TIMING WAVEFORM 34
DS17285 24-PIN DIP 35
DS17285 24-PIN SO 36
DS17285 28-PIN TSOP 37
DS17287 RTC PLUS RAM 38

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