Transmit ac characteristics, Ransmit, Ac c – Rainbow Electronics DS21458 User Manual
Page 265: Haracteristics, 4 transmit ac characteristics, Ac characteristics–transmit side
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
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.