M41T80(2002) Просмотр технического описания (PDF) - STMicroelectronics

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M41T80
(Rev.:2002)

SERIAL ACCESS RTC WITH ALARMS

STMicroelectronics 

Figure 8. Bus Timing Requirements Sequence

SDA

tBUF

SCL

P

tHD:STA

tR

tF

tHIGH

S

tLOW

tSU:DAT

tHD:DAT

M41T80

tHD:STA

tSU:STA

SR

tSU:STO

P

AI00589

Table 7. AC Characteristics

Sym

Parameter(1)

Min

Typ

Max

Units

fSCL

SCL Clock Frequency

0

400

kHz

tLOW

Clock Low Period

1.3

µs

tHIGH

Clock High Period

600

ns

tR

SDA and SCL Rise Time

300

ns

tF

SDA and SCL Fall Time

300

ns

tHD:STA

START Condition Hold Time

(after this period the first clock pulse is generated)

600

ns

tSU:STA

START Condition Setup Time

(only relevant for a repeated start condition)

600

ns

tSU:DAT(2) Data Setup Time

100

ns

tHD:DAT Data Hold Time

0

µs

tSU:STO STOP Condition Setup Time

600

ns

tBUF

Time the bus must be free before a new

transmission can start

1.3

µs

Note: 1. Valid for Ambient Operating Temperature: TA = –40 to 85°C; VCC = 2.0 to 5.5V (except where noted).

2. Transmitter must internally provide a hold time to bridge the undefined region (300ns max) of the falling edge of SCL.

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