Rainbow-electronics DS1554 Bedienungsanleitung PDF herunterladen (Seite 12)

DS1554

12 of 20

READ CYCLE, AC CHARACTERISTICS (Over the Operating Range)

=5.0V ±

±±

±10% V

=3.3V ±

±±

±10%

PARAMETER SYMBOL

MIN MAX MIN MAX

UNITS NOTES

Read Cycle Time t

70 120 ns

Address Access Time t

70 120 ns

CE to DQ Low-Z

CEL

55ns

CE Access Time

CEA

70 120 ns

CE Data Off time

CEZ

25 40 ns

OE to DQ Low-Z

OEL

55ns

OE Access Time

OEA

35 100 ns

OE Data Off Time

OEZ

25 35 ns

Output Hold from Address t

55ns

WRITE CYCLE, AC CHARACTERISTICS (Over the Operating Range)

=5.0V ±

±±

±10% V

=3.3V ±

±±

±10%

PARAMETER SYMBOL

MIN MAX MIN MAX

UNITS NOTES

Write Cycle Time t

70 120 ns

Address Access Time t

00ns

WE Pulse Width

WEW

50 100 ns

CE Pulse Width

CEW

60 110 ns

Data Setup Time t

30 80 ns

Data Hold time t

DH1

0 0 ns 9

Data Hold time t

DH2

0 5 ns 10

Address Hold Time t

AH1

5 0 ns 9

Address Hold Time t

AH2

5 5 ns 10

WE Data Off Time

WEZ

25 40 ns

Write Recovery Time t

510ns

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 18 19 20

256K NV Y2KC Timekeeping RAM 1
ORDERING INFORMATION 2
PIN DESCRIPTION 2
- Battery Connection 2
DESCRIPTION 2
PACKAGES 3
DS1554 BLOCK DIAGRAM Figure 1 3
DATA READ MODE 4
DATA WRITE MODE 4
DATA RETENTION MODE 4
BATTERY LONGEVITY 5
INTERNAL BATTERY MONITOR 5
POWER-ON RESET 5
CLOCK OPERATIONS 5
DS1554 REGISTER MAP Table 2 6
CLOCK OSCILLATOR CONTROL 6
READING THE CLOCK 6
SETTING THE CLOCK 7
CLOCK ACCURACY (DIP MODULE) 7
FREQUENCY TEST MODE 7
USING THE CLOCK ALARM 7
ALARM MASK BITS Table 3 8
USING THE WATCHDOG TIMER 9
POWER-ON DEFAULT STATES 9
10 of 20 10
IRQ /FT and RST 10
DC ELECTRICAL CHARACTERISTICS 11
(Over the Operating Range; V 11
=3.3V ±10%) 11
13 of 20 13
POWER-UP/DOWN CHARACTERISTICS 14
=5.0V ±10%) 14
15 of 20 15
CE or WE at V 15
RST High 15
IRQ /FT, RST 15
AC TEST CONDITIONS 16
DS1554 32-PIN PACKAGE 17
18 of 20 18
19 of 20 19
20 of 20 20

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