Rainbow-electronics DS1315 Manual de usuario descargar pdf (Pagina 19)

DS1315

041697 19/22

NOTES:

1. All voltages are referenced to ground.

2. Measured with load shown in Figure 15.

3. Input pulse rise and fall times equal 10 ns.

4. t

is a function of the latter occurring edge of WE or CE in RAM mode, or OE or CE in ROM mode.

5. t

and t

are functions of the first occurring edge of WE or CE in RAM mode, or OE or CE in ROM mode.

6. Measured without RAM connected.

7. I

CC01

is the maximum average load current the DS1315 can supply to external memory.

8. Applies to CEO

with the ROM/RAM pin grounded. When the ROM/RAM pin is connected to V

CCO

, CEO will go

to a low level as V

CCI

falls below V

BAT

9. I

CC02

is the maximum average load current that the DS1315 can supply to memory in the battery backup mode.

10.Applies to all input pins except RST

. RST is pulled internally to V

CCI

11. See Figures 11 and 12.

12.See Figures 13 and 14.

13.V

is determined by the larger of V

BAT1

and V

BAT2

OUTPUT LOAD Figure 15

50 pF

680

1.1K

CCI

1 2 ... 14 15 16 17 18 19 20 21 22

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Rainbow-electronics DS1315 Manual de usuario Pagina 19