Datasheet

DS2155
234 of 238
37.5 Transmit AC Characteristics
AC CHARACTERISTICS: TRANSMIT SIDE
(Figure 37-12, Figure 37-13, and Figure 37-14)
(V
DD
= 3.3V ±5%, T
A
= -40°C to +85°C for DS2155L; V
DD
= 3.3V ±5%, T
A
= 0°C to +70°C for DS2155LN)
PARAMETER SYMBOL CONDITIONS MIN TYP (E1) MAX UNITS
488 (E1)
TCLK Period t
CP
648 (T1)
ns
t
CH
20 0.5 t
CP
TCLK Pulse Width
t
CL
20
0.5 t
CP
ns
488 (E1)
TCLKI Period t
LP
648 (T1)
ns
t
LH
20
0.5 t
LP
TCLKI Pulse Width
t
LL
20 0.5 t
LP
ns
(Note 8) 648
(Note 9) 448
(Note 10) 244
(Note 11)
122
TSYSCLK Period t
SP
(Note 12)
61
ns
20 0.5 t
SP
TSYSCLK Pulse Width t
SP
20
0.5 t
SP
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, TDATA, TLINK, TPOSI,
TNEGI Setup to TCLK, TSYSCLK,
TCLKI Falling
t
SU
20 ns
TSER, TSIG, TDATA, 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 TESO, UT-UTDO
Valid
t
D1
50 ns
Delay TCLK to TCHBLK, TCHCLK,
TSYNC, TLCLK
t
D2
50 ns
Delay TSYSCLK to TCHCLK,
TCHBLK
t
D3
22 ns
Note 8: TSYSCLK = 1.544MHz
Note 9: TSYSCLK = 2.048MHz
Note 10: TSYSCLK = 4.096MHz
Note 11: TSYSCLK = 8.192MHz
Note 12: TSYSCLK = 16.384MHz