DS1746_10 Datasheet, PDF(15/16 Page) Maxim Integrated Products – Y2K-Compliant, Nonvolatile Timekeeping RAMs

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

DS1746_10 Datasheet, PDF (15/16 Pages) Maxim Integrated Products – Y2K-Compliant, Nonvolatile Timekeeping RAMs

◁

DS1746/DS1746P 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

Output: 1.5V

Input Pulse Rise and Fall Times: 5ns

NOTES:

1) Voltages are referenced to ground.

2) Typical values are at +25ï°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 +25ï°C.

6) Each DS1746 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 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 temperatures as long as temperature exposure to the lithium energy source contained within

does not exceed +85ï°C. Post-solder cleaning with water-washing techniques is acceptable, provided

that ultra-sonic vibration is not used.

In addition, for the PowerCap:

a) Maxim recommends that PowerCap module bases experience one pass through solder reflow

oriented with the label side up (âlive-bugâ).

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) tWR1, tDH1 are measured from WE going high.

9) tWR2, tDH2 are measured from CE going high.

10) tWC = 200ns.

PACKAGE INFORMATION

For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a â+â, â#â, or â-â

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

PACKAGE CODE

DOCUMENT NO. LAND PATTERN NO.

32 EDIP

MDF32+1

21-0245

34 PWRCP

PC2+6

21-0246

15 of 16

▷