DS9034PCX datasheet(13/17 Pages) DALLAS

13 / 17 page

DS1743/DS1743P

13 of 17

AC TEST CONDITIONS

Output Load:

100 pF + 1TTL Gate

Input Pulse Levels:

0.0 to 3.0V

Timing Measurement Reference Levels:

Input: 1.5V

Output: 1.5V

Input Pulse Rise and Fall Times: 5 ns

NOTES:

1. Voltages are referenced to ground.

2. Typical values are at 25

°C and nominal supplies.

3. Outputs are open.

4. Battery switchover occurs at the lower of either the battery terminal voltage or VPF.

5. The CE2 control signal functions exactly the same as the CE signal except that the logic levels for

active and inactive levels are opposite.

6. Data retention time is at 25

°C.

7. Each DS1743 has a built-in switch that disconnects the lithium source until VCC is first applied by the

user. The expected t DR is defined for DIP modules as a cumulative time in the absence of VCC starting

from the time power is first applied by the user.

8. Real-Time Clock Modules (DIP) can be successfully processed through conventional wave-soldering

techniques as long as temperatures 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.

In addition, for the PowerCap:

a. Dallas Semiconductor recommends that PowerCap Module bases experience one pass through

solder reflow oriented with the label side up (“live - bug”).

b. Hand Soldering and touch-up: Do not touch or apply the soldering iron to leads for more than

3 (three) seconds. To solder, apply flux to the pad, heat the lead frame pad and apply solder. To

remove the part, apply flux, heat the lead frame pad until the solder reflow and use a solder wick to

remove solder.

DS9034PCX Datasheet(PDF) 13 Page - Dallas Semiconductor