Ricoh R5C841 - Manual (Page 70)

R5C841 PCI-CardBus/IEEE 1394/SD Card/Memory Stick/xD/ExpressCard Data Sheet
12345  2004 R EV . 1.10 5-17
5.3.7 Serial ROM Interface signals
SDA (UDIO4), SCL(UDIO3)
(VCC_ROUT= 1.65~1.95V, VCC_3V=3.0~3.6V, Ta=0~70ºC)
Symbol Parameter Min Max Unit Note
SDA (UDIO4), SCL (UDIO3)
f SCL SCL clock frequency 0 100 kHz
t BUF Bus free time between a STOP and START condition 4.7 - us
t HD;STA Hold time (repeated) START condition. After this
period, the first clock pulse is generated 4.0 - us
t LOW LOW period of the SCL clock 4.7 - us
t HIGH HIGH period of the SCL clock 4.0 - us
t SU;STA Set–up time for a repeated START condition 4.7 - us
t HD;DAT Data hold time for I 2 C–bus devices 0 us
t SU;DAT Data set–up time 250 - ns
t R Rise time of both SDA and SCL signals - 1000 ns
t F Fall time of both SDA and SCL signals - 300 ns
t SU;STO Set–up time for STOP condition 4.0 - us
t sp Pulse width of spikes which must be suppressed by
the input filter n/a n/a ns
C b Capacitive load for each bus line - 400 pF
All values referred to V IHmin and V ILmax levels (see 5.2.11).
Serial ROM if SDA,SCL timing
SDA(UDIO4)
S P
t
HD;STA
t
HD;DAT
t
SP t
R
t
LOW
t
BUF
SCL(UDIO3)
t
SU;DAT
t
HIGH
t
SU;STA
t
HD;STA
t
F
t
SU;STO
Sr P