PDIUSBH11 Datasheet, PDF (22/26 Pages) NXP Semiconductors – Universal Serial Bus Hub

Philips Semiconductors
Universal Serial Bus Hub
Product specification
PDIUSBH11
AC CHARACTERISTICS (I²C)
All timing values are valid within the operating supply voltage and ambient temperature range and reference to V_IL and V_IH with an input voltage
swing of V_SS and V_DD.
SYMBOL
PARAMETER
LIMITS
UNIT
MIN
TYP
MAX
I²C-bus timing (see Figure ; Note )
f_SCL
SCL clock frequency
–
–
100
kHZ
t_SP
Tolerable spike width on bus
–
–
100
ns
t_BUF
Bus free time
4.7
–
–
µs
t_SU;STA
Start condition set-up time
4.7
–
–
µs
t_HD;STA
Start condition hold time
4.0
–
–
µs
t_LOW
SCL LOW time
4.7
–
–
µs
t_HIGH
SCL HIGH time
4.0
–
–
µs
t_r
SCL and SDA rise times
–
–
1.0
µs
t_f
SCL and SDA fall times
–
–
0.3
µs
t_SU;DAT
Data set-up time
250
–
–
ns
t_HD;DAT
Data hold time
0
–
–
ns
t_VD;DAT
SCL LOW to data out valid
–
–
3.4
µs
t_SU;STO
Stop condition set-up time
4.0
–
–
µs
1. A detailed description of the I²C-bus specification, with applications, is given in brochure ‘‘The I²C-bus and how to use it”. This brochure
may be ordered using the code 9398 393 40011.
PROTOCOL
SCL
SDA
START
CONDITION
(S)
BIT 7
MSB
(A7)
BIT 6
(A6)
t_SU;STA
t_LOW
t_HIGH
1/f_SCL
t_r
t_f
t_BUF
BIT 0
LSB
(R/W)
ACKNOWLEDGE
(A)
STOP
CONDITION
(P)
t_HD;STA
t_SU;DAT
t_HD;DAT
t_VD:DAT
t_SU;STO
Figure 4. I²C-bus timing diagram; rise and fall times refer to V_IL and V_IH
SV00756
1997 Aug 01
22