TMS570LS3137 datasheet(139/159 Pages) TI

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TMS570LS3137

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SPNS162.

– SEPTEMBER 2011

NOTE

•

A device must internally provide a hold time of at least 300 ns for the SDA signal

(referred to the VIHmin of the SCL signal) to bridge the undefined region of the falling

edge of SCL.

•

The maximum th(SDA-SCLL) has only to be met if the device does not stretch the LOW

period (tw(SCLL)) of the SCL signal.

•

A Fast-mode I2C-bus device can be used in a Standard-mode I2C-bus system, but the

requirement tsu(SDA-SCLH) ≥ 250 ns must then be met. This will automatically be the case if

the device does not stretch the LOW period of the SCL signal. If such a device does

stretch the LOW period of the SCL signal, it must output the next data bit to the SDA line

tr max + tsu(SDA-SCLH).

•

Cb = total capacitance of one bus line in pF. If mixed with fast-mode devices, faster

fall-times are allowed.

Peripheral Information and Electrical Specifications

139

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