Rainbow-electronics DS17487 Manual do Utilizador descarregar pdf (Página 25)

DS17485/DS17487

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

V 8

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

DS17485/DS17487 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
DS17485 ONLY 6
RTC ADDRESS MAP 7
8 of 38 8
CONTROL REGISTERS 9
REGISTER A 9
LSB 9
REGISTER B 10
LSB 10
REGISTER C 11
REGISTER D 11
NV RAM–RTC 12
INTERRUPT CONTROL 12
SQUARE-WAVE OUTPUT SELECTION 13
PERIODIC INTERRUPT SELECTION 13
OSCILLATOR CONTROL BITS 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
CRYSTAL SPECIFICATIONS* 26
AC TEST CONDITIONS 27
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
DS17485 24-PIN DIP 35
DS17485 24-PIN SO 36
DS17485 28-PIN TSOP 37
DS17487 RTC PLUS RAM 38

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