Rainbow-electronics DS17287 Manual do Utilizador descarregar pdf (Página 28)

DS17285/DS17287

28 of 38

RTC AC TIMING CHARACTERISTICS Over the operating range (5V)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

Cycle Time t

CYC

240 DC ns

Pulse-Width, RD / WR Low

RWL

120 ns

Pulse-Width, RD / WR High

RWH

80 ns

Input Rise and Fall Time t

, t

30 ns

Chip-Select Setup Time

before

WR or RD

20 ns

Chip-Select Hold Time t

0ns

Read Data Hold Time t

DHR

10 50 ns

Write Data Hold Time t

DHW

0ns

Muxed Address Valid Time to

ALE Fall

ASL

20 ns

Muxed Address Hold Time to

ALE fall

AHL

10 ns

RD or WR High Setup to

ALE Rise

ASD

25 ns

Pulse-Width ALE High PW

ASH

40 ns

ALE Low Setup to RD or WR

Fall

ASED

30 ns

Output Data-Delay Time from

DDR

20 120 ns 6

Data Setup Time t

DSW

30 ns

IRQ Release from RD

IRD

AC TEST CONDITIONS

Output Load: 50pF

Input Pulse Levels: 0V to 3.0V

Timing Measurement Reference Levels

Input: 1.5V

Output: 1.5V

Input Pulse Rise and Fall Times: 5ns

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 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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