71M6543GHT datasheet(13/75 Pages) MAXIM

13 / 75 page

Maxim Integrated │ 13

71M6543FT/71M6543HT/

71M6543GT/71M6543GHT

Energy Meter ICs

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Recommended External Components

Note 1: Parameter not tested in production, guaranteed by design to six-sigma.

Note 2: If the capacitor values of CXS = 15pF and CXL = 10pF have already been installed, then changing the CXL value to 33pF

and leaving CXS = 15pF would minimize rework.

NAME

FROM

FUNCTION

VALUE

UNITS

VV3P3A

GNDA

Bypass capacitor for 3.3V supply

≥0.1±20%

µF

VV3P3D

GNDD

Bypass capacitor for 3.3V output

0.1 ±20%

µF

CSYS

VV3P3SYS

GNDD

Bypass capacitor for VV3P3SYS

≥1.0±30%

µF

CVDD

VDD

GNDD

Bypass capacitor for VDD

0.1 ±20%

µF

CVLCD

VLCD

GNDD

Bypass capacitor for VLCD pin

≥0.1±20%

µF

XTAL

XIN

XOUT

32.768 kHz crystal; electrically similar to ECS

.327-12.5-17X, Vishay XT26T or Suntsu SCP6–

32.768kHz TR (load capacitance 12.5pF)

32.768

kHz

CXS

(Note 2)

XIN

GNDA

Load capacitor values for crystal depend on crystal

specificationsandboardparasitics.Nominal

values are based on 3pF allowance for the sum

of board and chip capacitances.

22 ±10%

CXL

(Note 2)

XOUT

GNDA

22 ±10%

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