Rainbow-electronics DS1511 Manual do Utilizador descarregar pdf (Página 3)

DS1501/DS1511 Y2KC Watchdog Real-Time Clocks

3 of 20

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Battery Leakage Current I

LKG

100 nA

DC ELECTRICAL CHARACTERISTICS

= 0V; T

= 0°C to +70°C; V

= 0V, T

= -40°C to +85°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Battery Current, BB32 = 0, EOSC = 0

BAT1

(Note 7)

0.27 1.0 µA

Battery Current, BB32 = 0, EOSC = 1

BAT2

(Note 7)

0.01 0.1 µA

BAUX

Current BB32 = 1, SQW Open I

BAUX

(Note 7) 2 µA

CRYSTAL SPECIFICATIONS*

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Nominal Frequency f

32.768 kHz

Series Resistance ESR 45 kΩ

Load Capacitance C

6 pF

*The crystal, traces, and crystal input pins should be isolated from RF generating signals. Refer to Application Note 58: Crystal Considerations

for Dallas Real-Time Clocks for additional specifications.

AC OPERATING CHARACTERISTICS

= 5V ±10%, T

= 0°C to +70°C; V

= 5V ±10%, T

= -40°C to +85°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Read Cycle Time t

70 ns

Address Access Time t

70 ns

CE to DQ Low-Z

CEL

(Note 8)

5 ns

CE Access Time

CEA

70 ns

CE Data Off Time

CEZ

(Note 8)

25 ns

OE to DQ Low-Z (0°C to +85°C)

OEL

(Note 8)

5 ns

OE to DQ Low-Z (-40°C to 0°C)

OEL

(Note 8)

2 ns

OE Access Time

OEA

35 ns

OE Data Off Time

OEZ

(Note 8)

25 ns

Output Hold from Address t

5 ns

Write Cycle Time

70 ns

Address Setup Time

0 ns

WE Pulse Width

WEW

50 ns

CE Pulse Width

CEW

55 ns

Data Setup Time

30 ns

Data Hold Time

5 ns

Address Hold Time

0 ns

WE Data Off Time

WEZ

(Note 8) 25 ns

Write Recovery Time

15 ns

Pulse Width, OE, WE, or CE High

HIGH

20 ns

Pulse Width, OE, WE, or CE Low

LOW

70 ns

1 2 3 4 5 6 7 8 ... 19 20

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