DS261PP5
CS61584A
CS61584A
SWITCHING CHARACTERISTICS - SERIAL PORT (TA = -40 to 85 °C; DV+, TV+, RV+ =
nominal ± 0.3 V; Inputs: Logic 0 = 0 V, Logic 1 = RV+)
Parameter
Symbol
tdc
Min
25
25
50
50
-
Typ
Max
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
SDI to SCLK Setup Time
SCLK to SDI Hold Time
SCLK Low Time
-
-
-
-
tcdh
tcl
-
-
SCLK High Time
tch
-
-
SCLK Rise and Fall Time
CS to SCLK Setup Time
SCLK to CS Hold Time
CS Inactive Time
tr, tf
tcc
-
15
-
20
20
100
-
-
(Note 28)
(Note 29)
tcch
tcwh
tcdv
tcdz
-
-
-
-
SDO Valid to SCLK
CS to SDO High Z
-
50
-
-
50
Notes: 28. If SPOL = 0, then CS should return high no sooner than 20 ns after the 16th rising edge of SCLK during
a serial port read.
29. Output load capacitance = 50 pF.
t
cwh
CS
t
t
cch
ch
t
cc
t
cl
SCLK
t
cdh
t
cdh
t
dc
SDI
LSB
LSB
MSB
CONTROL BYTE
DATA BYTE
Figure 4. Serial Port Write Timing Diagram
CS
t
cdz
SCLK
t
cdv
SDO
HIGH
SPOL = 0
Figure 5. Serial Port Read Timing Diagram
10
10
DS261PP5
DS261F1
CIRRUS [ CIRRUS LOGIC ]
