Datasheet
____________________________________________________ DS34T101, DS34T102, DS34T104, DS34T108
329 of 366
Table 14-4. Transmit AC Characteristics
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
TCLKF or TCLKO Period t
CP
t
CP
648
488
ns
ns
1
2
TCLKF or TCLKO Pulse Width t
CH
t
CL
t
CH
t
CL
259
259
195
195
389
389
289
289
ns
ns
ns
ns
1
1
2
2
TSYSCLK Period t
SP
t
SP
648
448
ns
ns
3
4
TSYSCLK Pulse Width t
SH
t
SL
t
SH
t
SL
259
259
195
195
389
389
289
289
ns
ns
ns
ns
1
1
2
2
TSER, TSYNC/TSSYNC Set Up to
TCLKF or TSYSCLK Falling
t
SU
20 ns
TSER, TSYNC/TSSYNC Hold from
TCLKF or TSYSCLK Falling
t
HD
20 ns
Delay TCLKF or TCLKO to TSYNC t
D2
50 ns
Delay TCLKO to TDATF t
D3
50 ns
NOTES:
1. T1 Mode
2. E1 Mode
3. TSYSCLK = 1.544 MHz.
4. TSYSCLK = 2.048 MHz.
The output timing specification for each transmit formatter signal is with a 30pF load.
Figure 14-5. Transmit Formatter Timing Using the TCLKF Pin
TCLKF
TSER
TSYNC
TSYNC
t
D2
t
SU
t
CL
t
CH
t
CP
t
SU
t
HD
t
Hd
1
2
3
NOTES:
1. TSYNC is in the output mode.
2. TSYNC is in the input mode.
3. TSER is sampled on the falling edge of TCLK when the transmit side elastic store is disabled.