M41T66 datasheet(24/33 Pages) STMICROELECTRONICS

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DC and AC parameters

M41T66

24/33

DC and AC parameters

This section summarizes the operating and measurement conditions, as well as the DC and

AC characteristics of the device. The parameters in the following DC and AC Characteristic

tables are derived from tests performed under the measurement conditions listed in the

relevant tables. Designers should check that the operating conditions in their projects match

the measurement conditions when using the quoted parameters.

Figure 14.

AC measurement I/O waveform

Figure 15.

Crystal isolation example

Substrate pad should be tied to VSS.

To avoid coupling between pin 4 (SQW) and pin 2 (XO), pin 3 (GND) should be routed adjacent to pin 4 for

isolation purposes.

Table 8.

Operating and AC measurement conditions(1)

Output Hi-Z is defined as the point where data is no longer driven.

Parameter

M41T66

Supply voltage (VCC)

1.5 V to 4.4 V

Ambient operating temperature (TA)

–40 to 85°C

Load capacitance (CL)

50 pF

Input rise and fall times

≤ 5 ns

Input pulse voltages

0.2 VCC to 0.8 VCC

Input and output timing ref. voltages

0.3 VCC to 0.7 VCC

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