DS1742-85 查看數據表（PDF） - Maxim Integrated

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DS1742-85

Y2KC Nonvolatile Timekeeping RAM

Maxim Integrated 

DS1742

AC TEST CONDITIONS

Output Load: 100pF + 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: 5ns

NOTES:

1) Voltage 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 voltage or VPF.

5) Data retention time is at +25°C.

6) Each DS1742 has a built-in switch that disconnects the lithium source until VCC is first

applied by the user. The expected tDR is defined as a cumulative time in the absence of VCC

starting from the time power is first applied by the user.

7) 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 to prevent damage to

the crystal.

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