DS1744WP-120IND 查看數據表（PDF） - Unspecified

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DS1744WP-120IND

Y2K-Compliant, Nonvolatile Timekeeping RAMs

Unspecified 

DS1744/DS1744P

Y2K-Compliant, Nonvolatile Timekeeping RAMs

AC TEST CONDITIONS

Output Load: 50pF + 1TTL Gate

Input Pulse Levels: 0 to 3.0V

Timing Measurement Reference Levels: Input: 1.5V

Input Pulse Rise and Fall Times: 5ns

Output: 1.5V

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) Data-retention time is at +25°C.

6) Each DS1744 has a built-in switch that disconnects the lithium source until the user first applies VCC. The expected tDR is

defined for DIP modules and assembled PowerCap modules as a cumulative time in the absence of VCC starting from the time

power is first applied by the user.

7) RTC modules (DIP) 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.

In addition, for the PowerCap:

a.) ARTSCHIP 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 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

reflows, and use a solder wick to remove solder.

8) tAH1, tDH1 are measured from

9) tAH2, tDH2 are measured from

going high.

going high.

www.artschip.com

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