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34.4 Transmit AC Characteristics
AC CHARACTERISTICS–TRANSMIT SIDE
(0°C to +70°C; V
DD
= 3.3V ± 5% for DS21Q55;
-40°C to +85°C; V
DD
= 3.3V ± 5% for DS21Q55N)
PARAMETER SYMBOL MIN TYP (E1) MAX UNITS NOTES
TCLK Period
t
CP
488 (E1)
648 (T1)
ns
TCLK Pulse Width
t
CH
t
CL
20
20
.5 t
CP
.5 t
CP
ns
ns
TCLKI Period
t
LP
488 (E1)
648 (T1)
ns
TCLKI Pulse Width
t
LH
t
LL
20
20
.5 t
LP
.5 t
LP
ns
ns
TSYSCLK Period
t
SP
t
SP
t
SP
t
SP
t
SP
648
448
244
122
61
ns
ns
ns
ns
ns
1
2
3
4
5
TSYSCLK Pulse Width
t
SP
t
SP
20
20
.5 t
SP
.5 t
SP
ns
ns
TSYNC or TSSYNC Setup to TCLK or
TSYSCLK Falling
t
SU
20
ns
TSYNC or TSSYNC Pulse Width t
PW
50 ns
TSER, TSIG, TLINK, TPOSI, TNEGI
Set Up to TCLK, TSYSCLK, TCLKI
Falling
t
SU
20 ns
TSER, TSIG, TLINK Hold From
TCLK or TSYSCLK, Falling
t
HD
20 ns
TPOSI, TNEGI Hold From TCLKI
Falling
t
HD
20 ns
TCLK, TCLKI or TSYSCLK Rise and
Fall Times
t
R
, t
F
25 ns
Delay TCLKO to TPOSO, TNEGO
Valid
t
DD
50 ns
Delay TCLK to TCHBLK, TCHCLK,
TSYNC, TLCLK
t
D2
50 ns
Delay TSYSCLK to TCHCLK,
TCHBLK
t
D3
22 ns
See Figures 37-11 to 37-13
NOTES:
1) TSYSCLK = 1.544MHz.
2) TSYSCLK = 2.048MHz.
3) TSYSCLK = 4.096MHz.