DS1501/DS1511 Y2KC Watchdog Real-Time Clocks

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DC ELECTRICAL CHARACTERISTICS

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Battery Current, BB32 = 0,

EOSC = 0

(Note 7)

0.27

1.0

μA

Battery Current, BB32 = 0,

EOSC = 1

(Note 7)

0.01

0.1

μA

(Note 7)

2

μA

CRYSTAL SPECIFICATIONS*

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Nominal Frequency

32.768

kHz

Series Resistance

ESR

45

k

Ω

Load Capacitance

6/12.5

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

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Read Cycle Time

70

ns

Address Access Time

70

ns

CE to DQ Low-Z

(Note 8)

5

ns

CE Access Time

70

ns

CE Data-Off Time

(Note 8)

25

ns

OE to DQ Low-Z (0°C to +85°C)

(Note 8)

5

ns

OE to DQ Low-Z (-40°C to 0°C)

(Note 8)

2

ns

OE Access Time

35

ns

OE Data-Off Time

(Note 8)

25

ns

Output Hold from Address

5

ns

Write Cycle Time

70

ns

Address Setup Time

0

ns

WE Pulse Width

50

ns

CE Pulse Width

55

ns

Data Setup Time

30

ns

Data Hold Time

5

ns

Address Hold Time

0

ns

WE Data-Off Time

(Note 8)

25

ns

Write Recovery Time

15

ns

Pulse Width,

OE, WE, or CE High

20

ns

Pulse Width,

OE, WE, or CE Low

70

ns