PRELIMINARY
PCT1789W DATA SHEET
SWITCHING CHARACTERISTICS
!!
Serial Interface (DCE = 1, FSD = 1)
Given values are: VA = charge pump, VD = +3.3 V ± 5%; TA = 70 °C for K-grade, 85 °C for B-grade; CL = 20 pF.
All timing is referenced to the 50% level of the waveform. Input test levels are: VIH = VD – 0.4V, VIL = 0.4V.
Table 27 Switching Characteristics—Serial Interface (DCE = 1, FSD = 0)
Parameter
Symbol
Min
Typ
Max
Unit
Cycle time, SCLK
tc
354
1/256 Fs
ns
SCLK duty cycle
tdty
td1
td2
td3
td4
td5
tsu
th
50
%
ns
ns
ns
ns
ns
ns
ns
ns
ns
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, SDO before RGDT ¯
Setup time, SDO before SCLK ¯
Hold time, SDO after SCLK ¯
Setup time, SDI before SCLK
Hold time, SDI after SCLK
10
10
0.25tc–20
0.25tc+20
20
20
25
20
25
20
tsu2
th2
tc
SCLK
td1
td2
FSYNC
(mode 1)
td3
tsu
td4
D0
th
SDO
(master)
D15
D14
D13
td3
SDO
D15
(slave 1)
td5
FSD
SDI
tsu2
D15
th2
D14
D1
D0
Figure 19 Serial Interface Timing Diagram (DCE = 1, FSD = 1)
PRELIMINARY
PC-TEL, Inc.
58
1789W0DOCDAT06A-0299
ETC [ ETC ]
