Owner's manual

DS21455/DS21458 Quad T1/E1/J1 Transceivers
265 of 270
38.4 Transmit AC Characteristics
AC CHARACTERISTICS–TRANSMIT SIDE
(V
DD
= 3.3V ±5%, T
A
= 0°C to +70°C for DS21455/DS21458;
V
DD
= 3.3V ±5%, T
A
= -40°C to +85°C; for DS21455N/DS21458N.) (See Figure 38-13 to Figure 38-15.)
PARAMETER SYMBOL MIN TYP (E1) MAX UNITS NOTES
488 (E1) ns
TCLK Period t
CP
648 (T1)
t
CH
20 0.5 t
CP
ns
TCLK Pulse Width
t
CL
20 0.5 t
CP
ns
488 (E1) ns
TCLKI Period t
LP
648 (T1)
t
LH
20 0.5 t
LP
ns
TCLKI Pulse Width
t
LL
20 0.5 t
LP
ns
648 ns 1
448 ns 2
244 ns 3
122 ns 4
TSYSCLK Period t
SP
61 ns 5
20 0.5 t
SP
ns
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 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
NOTES:
1) TSYSCLK = 1.544MHz.
2) TSYSCLK = 2.048MHz.
3) TSYSCLK = 4.096MHz.
4) TSYSCLK = 8.192MHz.
5) TSYSCLK = 16.384MHz.