AK61584 Datasheet, PDF (8/38 Pages) Asahi Kasei Microsystems – Dual Low Power T1/E1 Line Interface

ASAHI KASEI
[AK61584]
SWITCHING CHARACTERISTICS -SERIAL PORT (TA = -40 to 85^oC;
DV+,TV+,RV+ = nominal +/-0.3V; Inputs: Logic 0 = 0V, Logic 1 = RV+)
Parameter
Symbol Min Typ Max Units
SDI to SCLK Setup Time
tdc
25
-
-
ns
SCLK to SDI Hold Time
tcdh
25
-
-
ns
SCLK Low Time
tcl
50
-
-
ns
SCLK High Time
tcl
50
-
-
ns
SCLK Rise and Fall Time
tr,tf
-
-
15
ns
CS to SCLK Setup Time
tcc
20
-
-
ns
SCLK to CS Hold Time
(Note 28)
tcch
20
-
-
ns
CS Inactive Time
tcwh
100
-
-
ns
SCLK to SDO Valid
(Note 29)
tcdv
-
-
50
ns
CS to SDO High Z
tcdz
-
50
-
ns
Notes: 28. If SPOL=0, then CS should return high no sooner than 20ns after the 16‘th falling edge of SCLK
during a serial port read.
29. Output load capacitance = 50 pF.
CS
SCLK
SDI
tcwh
tch
tcc
tcl
tcch
tdc
LSB
tcdh
LSB
MSB
CONTROL BYTE
DATA BYTE
Figure 4. Serial Port Write Timing Diagram
CS
tcdz
SCLK
tcdv
SDO
SPOL=0
Figure 5. Serial Port Read Timing Diagram
High-Z
0185-E-00
-8-
‘98/04