Ac test conditions – Rainbow Electronics DS1286 User Manual

Page 12

Advertising
background image

DS1286

12 of 13

NOTES:

1.

WE

is high for a read cycle.

2.

OE

= V

IH

or V

IL

. If

OE

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

state.

3. t

WP

is specified as the logical AND of the

CE

and

WE

. t

WP

is measured from the latter of

CE

or

WE

going low to the earlier of

CE

or

WE

going high.

4. t

DS

or t

DH

are measured from the earlier of

CE

or

WE

going high.

5. t

DH

is measured from

WE

going high. If

CE

is used to terminate the write cycle, then t

DH

= 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

DR

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.

Advertising