Datasheet

73M1866B/73M1966B Data Sheet DS_1x66B_001
18 Rev. 1.6
3.3 Interface Timing Specification
There are three interfaces associated with the 73M1x66B: the SPI interface, the PCM highway interface
and the line interface. This section provides the timing specification for the SPI interface and the PCM
highway interface.
3.3.1 SPI Interface
Table 10 lists the characteristics for the SPI interface.
Table 10: SPI Interface Switching Characteristics
Parameter Symbol Min Typ Max Unit
SCLK cycle time
1
t
scy
62.5
–
– ns
SCLK rise time t
scr
–
–
25 ns
SCLK fall time t
scf
–
–
25 ns
CS setup time t
ics
25
–
–
ns
CS hold time t
ich
20
–
–
ns
SDI setup time t
ids
25
–
–
ns
SDI hold time t
idh
20
–
–
ns
SDO turn on delay t
odd
–
–
20 ns
SDO turn off delay
t
odo
–
–
20
ns
SDO hold time
t
odh
–
–
20
ns
SDI to SDITHRU propagation delay t
idt
– 6 – ns
Note1: The minimal value of this parameter is for the case where only one 73M1906B is connected to the
host. If the daisy chain mode is used, the minimum SCLK cycle time increases according to the number
of slaves in the chain.
CS
SCLK
SDI
SDO
t
ics
t
scy
t
ids
t
idh
t
odd
t
odh
t
odo
t
ich
Figure 7: SPI Timing Diagram