M41TM6TR データシートの表示（PDF） - STMicroelectronics

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M41TM6TR

Serial Access TIMEKEEPER®

STMicroelectronics 

M41T00

Table 4. AC Measurement Conditions

Input Rise and Fall Times

≤ 5ns

Input Pulse Voltages

0.2VCC to 0.8VCC

Input and Output Timing Ref.

Voltages

0.3VCC to 0.7VCC

Note that Output Hi-Z is defined as the point where data is no longer

driven.

2-WIRE BUS CHARACTERISTICS

This bus is intended for communication between

different ICs. It consists of two lines: one bi-direc-

tional for data signals (SDA) and one for clock sig-

nals (SCL). Both the SDA and the SCL lines must

be connected to a positive supply voltage via a

pull-up resistor.

The following protocol has been defined:

– Data transfer may be initiated only when the bus

is not busy.

– During data transfer, the data line must remain

stable whenever the clock line is High. Changes

in the data line while the clock line is High will be

interpreted as control signals.

Accordingly, the following bus conditions have

been defined:

Bus not busy. Both data and clock lines remain

High.

Start data transfer. A change in the state of the

data line, from High to Low, while the clock is High,

defines the START condition.

Stop data transfer. A change in the state of the

data line, from Low to High, while the clock is High,

defines the STOP condition.

Figure 4. AC Testing Load Circuit

0.8VCC

0.2VCC

0.7VCC

0.3VCC

AI02568

Data valid. The state of the data line represents

valid data when after a start condition, the data line

is stable for the duration of the High period of the

clock signal. The data on the line may be changed

during the Low period of the clock signal. There is

one clock pulse per bit of data.

Each data transfer is initiated with a start condition

and terminated with a stop condition. The number

of data bytes transferred between the start and

stop conditions is not limited. The information is

transmitted byte-wide and each receiver acknowl-

edges with a ninth bit.

By definition, a device that gives out a message is

called "transmitter", the receiving device that gets

the message is called "receiver". The device that

controls the message is called "master". The de-

vices that are controlled by the master are called

"slaves".

Table 5. Capacitance (1, 2)

(TA = 25 °C, f = 1 MHz)

Symbol

Parameter

CIN

Input Capacitance (SCL)

COUT (3)

Output Capacitance (SDA, FT/OUT)

tLP

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

Note: 1. Effective capacitance measured with power supply at 5V.

2. Sampled only, not 100% tested.

3. Outputs deselected.

Min

Max

Unit

7

pF

10

pF

250

1000

ns

4/15

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