M41T81 查看數據表（PDF） - STMicroelectronics

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M41T81

Serial access real-time clock with alarm

STMicroelectronics 

M41T81

5

DC and AC parameters

DC and AC parameters

Note:

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.

Table 7. Operating and AC measurement conditions

Parameter

Supply voltage (VCC)

Ambient operating temperature (TA)

Load capacitance (CL)

Input rise and fall times

Input pulse voltages

Input and output timing ref. voltages

M41T81

2.0 to 5.5 V

–40 to 85°C

100 pF

≤ 50 ns

0.2VCC to 0.8VCC

0.3VCC to 0.7VCC

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

Figure 14. AC measurement I/O waveform

0.8VCC

0.2VCC

0.7VCC

0.3VCC

AI02568

Table 8. Capacitance

Symbol

Parameter(1)(2)

Min

CIN

Input capacitance

-

COUT(3)

Output capacitance

-

tLP

Low-pass filter input time constant (SDA and SCL)

-

1. Effective capacitance measured with power supply at 5 V; sampled only, not 100% tested.

2. At 25°C, f = 1 MHz.

3. Outputs deselected.

Max

7

10

50

Unit

pF

pF

ns

Doc ID 7529 Rev 10

21/29

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