M41T256YMT7 查看數據表（PDF） - STMicroelectronics

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M41T256YMT7

256 Kbit (32K x8) Serial RTC

STMicroelectronics 

M41T256Y

DC AND AC PARAMETERS

This section summarizes the operating and mea-

surement 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 Measure-

Table 6. DC and AC Measurement Conditions

Parameter

VCC Supply Voltage

Ambient Operating Temperature

Load Capacitance (CL)

Input Rise and Fall Times

Input Pulse Voltages

Input and Output Timing Ref. Voltages

ment Conditions listed in the relevant tables. De-

signers should check that the operating conditions

in their projects match the measurement condi-

tions when using the quoted parameters.

M41T256Y

4.5 to 5.5V

–25 to 70°C

100pF

≤ 50ns

0.2VCC to 0.8VCC

0.3VCC to 0.7VCC

Figure 16. AC Testing Input/Output Waveforms

0.8VCC

0.2VCC

0.7VCC

0.3VCC

AI02568

Table 7. Capacitance

Symbol

Parameter(1,2)

Min

Input Capacitance

CIN

Input Capacitance (Tamper Pin)

CIO(3) Input / Output Capacitance

tLP

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

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

2. At 25°C, f = 1MHz.

3. Outputs deselected.

Max

Unit

7

pF

1000

pF

10

pF

50

ns

19/27

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