Rainbow-electronics DS1500 Bedienungsanleitung PDF herunterladen (Seite 3)

DS1500 Y2KC Watchdog RTC with Nonvolatile Control

3 of 19

DC ELECTRICAL CHARACTERISTICS

= 0V, T

= -40°C to +85°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Battery Current, BB32 = 0, EOSC = 0

BAT1

(Notes 8, 9)

0.27 1.0 µA

Battery Current, BB32 = 0, EOSC = 1

BAT2

(Notes 8, 9)

0.01 0.1 µA

BAUX

Current BB32 = 1, SQW Open I

BAUX

(Notes 8, 9) 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

CCI

= 5.0V ±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

CS to DQ Low-Z

CSL

(Note 10)

5 ns

CS Access Time

CSA

70 ns

CS Data Off Time

CSZ

(Note 10)

25 ns

OE to DQ Low-Z (0°C to +85°C)

OEL

(Note 10)

5 ns

OE to DQ Low-Z (-40°C to 0°C)

OEL

(Note 10)

2 ns

OE Access Time

OEA

35 ns

OE Data Off Time

OEZ

(Note 10)

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

CS Pulse Width

CSW

55 ns

Data Setup Time

30 ns

Data Hold Time

5 ns

Address Hold Time

0 ns

WE Data Off Time

WEZ

(Note 10) 25 ns

Write Recovery Time

15 ns

CEI to CEO Propagation Delay

CEPD

10 ns

Pulse Width, OE, WE, or CS High

HIGH

20 ns

Pulse Width, OE, WE, or CS Low

LOW

70 ns

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