DS250DF230: SMBus Switching Characteristics (Slave Mode)

K.Yaita

Part Number: DS250DF230

Hi Team,

DS250DF230 datasheet shows the following about SMBus Switching Characteristics (Slave Mode).

tHD_DAT: 0.75ns (typ)
tSU_DAT: 100ns (typ)

Could you let me know these minimum value?

Best Regards,
Yaita

over 4 years ago

0 Rodrigo Natal over 4 years ago

TI__Mastermind 19235 points

Hi Yaita,

I've included below for ease of reference the corresponding AC electrical parameters spec table from SMBus. As seen below the typical values from the datasheet correspond to the minimum values from the spec. Though listed on typical column these limits represent the minimum values. As these timing parameters are not tested in production TI guidelines prevent us from listing them on the "minimum" column in the datasheet.

Table 2. SMBus AC specifications

Symbol	Parameters	100 kHz Class		400 kHz Class			1 MHz Class			Units	Comments
		Min	Max	Min	Max	Min		Max
fSMB	SMBus Operating Frequency	10	100	10	400	10		1000		kHz	See Note 1
tBUF	Bus free time between STOP and START Condition	4.7	–	1.3	–	0.5			–	µs
tHD:STA	Hold time after (REPEATED) START Condition	4.0	–	0.6	–	0.26			–	µs	After this period, the first clock is generated
tSU:STA	REPEATED START Condition setup time	4.7	–	0.6	–	0.26			–	µs
tSU:STO	STOP Condition setup time	4.0	–	0.6	–	0.26			–	µs
tHD:DAT	Data hold time	0	–	0	–	0			–	ns	See Note 2
tSU:DAT	Data setup time	250	–	100	–	50			–	ns
tTIMEOUT	Detect clock low timeout	25	35	25	35	25		35		ms	See Note 3
tLOW	Clock low period	4.7	–	1.3	–	0.5			–	µs
tHIGH	Clock high period	4.0	50	0.6	50	0.26		50		µs	See Note 4
tLOW:SEXT	Cumulative clock low extend time (slave device)	–	25	–	25	–		25		ms	See Note 5

Cordially,

Rodrigo Natal

HSSC Applications Engineer

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DS250DF230: SMBus Switching Characteristics (Slave Mode)