Rainbow-electronics DS2404 Manual do Utilizador descarregar pdf (Página 28)

DS2404

28 of 29

NOTES:

1. All voltages are referenced to ground.

2. V

= 2.0V or V

= 0.8V with 10ns maximum rise and fall time.

3. V

DQH

= 2.4V and V

DQL

= 0.4V, respectively.

4. Load capacitance = 50pF.

5. Measured with outputs open.

6. When battery is applied to V

BATO

input, V

and V

BATB

must be 0V.

7. V

BATB

, or V

BATO

= 3.0V; all inputs inactive state.

8. Capacitance on the I/O pin could be 800pF when power is first applied. If a 5kW resistor is used to

pull-up the I/O line to V

PUP

, 5ms after power has been applied, the parasite capacitance will not affect

normal communications.

9. For auto-mode operation of the interval timer, the high level on the I/O pin must be greater than or

equal to 70% of V

or V

BATO

10. Read and write scratchpad (all 32 bytes) at 3.0V.

11. All other inputs at CMOS levels.

12. V

PUP

= external pull-up voltage.

13. Input load is to ground.

14. An additional reset or communication sequence cannot begin until the reset high time has expired.

15. Read data setup time refers to the time the host must pull the I/O line low to read a bit. Data is

guaranteed to be valid within 1ms of this falling edge.

16. Under certain low voltage conditions V

IL1MAX

may have to be reduced to as much as 0.5V to always

guarantee a presence pulse.

17. Applies to 1 Hz and IRQ pins only.

18. Applies to DQ pin only.

19. Applies to DQ, 1Hz and IRQ pins only.

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