DS1643 Просмотр технического описания (PDF) - Maxim Integrated

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Компоненты Описание

производитель

DS1643

Nonvolatile Timekeeping RAMs

Maxim Integrated 

DS1643/DS1643P

AC TEST CONDITIONS

Output Load: 100pF + 1TTL Gate

Input Pulse Levels: 0 to 3.0V

Timing Measurement Reference Levels:

Input: 1.5V

Output: 1.5V

Input Pulse Rise and Fall Times: 5ns

NOTES:

1) Voltages are referenced to ground.

2) Typical values are at +25C and nominal supplies.

3) Outputs are open.

4) The CE2 control signal functions exactly the same as the CE signal except that the logic levels for

active and inactive levels are opposite.

5) Data retention time is at 25C.

6) Each DS1643 has a built-in switch that disconnects the lithium source until VCC is first applied by the

user. The expected tDR 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.

7) Real-Time Clock 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. 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 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.

PACKAGE INFORMATION

For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note

that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a

different suffix character, but the drawing pertains to the package regardless of RoHS status.

PACKAGE TYPE

28 EDIP

34 PowerCap

PACKAGE CODE

MDF28+2

PC1+2

DOCUMENT NO.

21-0245

21-0246

12 of 17

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