PC-TEL, Inc.
58
1789N0DOCDAT01A-0399
PCT1789N DATA SHEET
S
WITCHING
C
HARACTERISTICS
!
PRELIMINARY
PRELIMINARY
Serial Interface (DCE = 1, FSD = 1)
Given values are: V
A
= charge pump, V
D
= 3.0 V to 5.25 V; T
A
= 0 °C to 70 °C for K-grade, –40 °C to +85 °C for
B-grade; C
L
= 20 pF.
All timing is referenced to the 50% level of the waveform. Input test levels are: V
IH
= V
D
– 0.4V, V
IL
= 0.4V.
Table 26 Switching Characteristics—Serial Interface (DCE = 1, FSD = 0)
Figure 21 Serial Interface Timing Diagram (DCE = 1, FSD = 1)
Parameter
Cycle time, SCLK
Symbol
t
c
t
dty
t
d1
t
d2
t
d3
t
d4
t
d5
t
su
t
h
t
su2
t
h2
Min
354
Typ
Max
Unit
ns
1/256 Fs
SCLK duty cycle
50
%
Delay time, SCLK
↑
to FSYNC
↑
Delay time, SCLK
↑
to FSYNC
↓
Delay time, SCLK
↑
to SDO valid
Delay time, SCLK
↑
to SDO Hi-Z
Delay time, SCLK
↑
before RGDT
↓
Setup time, SDO before SCLK
↓
Hold time, SDO after SCLK
↓
–10
20
ns
–10
20
ns
0.25t
c
–20
0.25t
c
+20
20
ns
ns
20
ns
25
ns
20
ns
Setup time, SDI before SCLK
25
ns
Hold time, SDI after SCLK
20
ns
D15
D14
D1
D0
t
su2
t
h2
D15
D14
D13
D0
SCLK
FSYNC
(mode 1)
SDO
(master)
SDO
(slave 1)
FSD
SDI
D15
t
d5
t
d3
t
d4
t
su
t
h
t
d3
t
d2
t
d1
t
c