Rainbow-electronics DS1286 Manuel d'utilisateur télécharger pdf (Page 12)

DS1286

12 of 13

NOTES:

1. WE is high for a read cycle.

2. OE = V

or V

. If OE = V IH during write cycle, the output buffers remain in a high impedance

state.

3. t

is specified as the logical AND of the CE and WE . t

is measured from the latter of CE or WE

going low to the earlier of CE or WE going high.

4. t

or t

are measured from the earlier of CE or WE going high.

5. t

is measured from WE going high. If CE is used to terminate the write cycle, then t

= 20 ns.

6. If the CE low transition occurs simultaneously with or later than the WE low transition in Write

Cycle 1, the output buffers remain in a high impedance state during this period.

7. If the CE high transition occurs prior to or simultaneously with the WE high transition, the output

buffers remain in a high impedance state during this period.

8. If

WE is low or the WE low transition occurs prior to or simultaneously with the CE low transition,

the output buffers remain in a high impedance state during this period.

9. Each DS1286 is marked with a four-digit date code AABB. AA designates the year of manufacture.

BB designates the week of manufacture. The expected t

is defined as starting at the date of

manufacture.

10. All voltages are referenced to ground.

11. Applies to both interrupt pins when the alarms are set to pulse.

12. Interrupt output occurs within 100 ns on the alarm condition existing.

13. Both INTA and INTB (INTB) are open drain outputs.

14. Real-Time Clock Modules can be successfully processed through conventional wave-soldering

techniques as long as temperature exposure to the lithium energy source contained within does not

exceed +85°C. Post-solder cleaning with water washing techniques is acceptable, provided that

ultrasonic vibration is not used.

AC TEST CONDITIONS

Output Load: 100 pF + 1TTL Gate

Input Pulse Levels: 0-3.0V

Timing Measurement Reference Levels

Input: 1.5V

Output: 1.5V

Input Pulse Rise and Fall Times: 5 ns.

1 2 ... 7 8 9 10 11 12 13

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Rainbow-electronics DS1286 Manuel d'utilisateur Page 12

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