DS1500 Y2KC Watchdog RTC with Nonvolatile Control

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DC ELECTRICAL CHARACTERISTICS

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Battery Current, BB32 = 0,

EOSC = 0

(Notes 8, 9)

0.27

1.0

µA

Battery Current, BB32 = 0,

EOSC = 1

(Notes 8, 9)

0.01

0.1

µA

(Notes 8, 9)

2

µA

CRYSTAL SPECIFICATIONS*

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Nominal Frequency

32.768

kHz

Series Resistance

ESR

45

kΩ

Load Capacitance

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

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Read Cycle Time

70

ns

Address Access Time

70

ns

CS to DQ Low-Z

(Note 10)

5

ns

CS Access Time

70

ns

CS Data Off Time

(Note 10)

25

ns

OE to DQ Low-Z (0°C to +85°C)

(Note 10)

5

ns

OE to DQ Low-Z (-40°C to 0°C)

(Note 10)

2

ns

OE Access Time

35

ns

OE Data Off Time

(Note 10)

25

ns

Output Hold from Address

5

ns

Write Cycle Time

70

ns

Address Setup Time

0

ns

WE Pulse Width

50

ns

CS Pulse Width

55

ns

Data Setup Time

30

ns

Data Hold Time

5

ns

Address Hold Time

0

ns

WE Data Off Time

(Note 10)

25

ns

Write Recovery Time

15

ns

CEI to CEO Propagation Delay

10

ns

Pulse Width,

OE, WE, or CS High

20

ns

Pulse Width,

OE, WE, or CS Low

70

ns