10
Desktop Transceiver SFX-TAP4_2/C, V0.1, Technical Description
The output current must not exceed 25 mA. Input signals < 1.0 V will be seen as LOW, > 2.4 V
as HIGH.
Refer to PCA9555 [3] for further details to signal properties of these digital IO signals.
4.5 Trigger Signals
The signals on the pins 1, 3, and 5 of the AUX connector are trigger signals. TRG0 (pin1) and
TRG1 (pin3) are output signals and TRG2 (pin5) is an input. The voltage limits on all these pins
is -0.3 V to 5.0 V. Load current is limited to 10 mA. Signals < 0.7V are seen a LOW, voltages >
2.0V as HIGH.
Two of the 3 trigger signals are in use: TRG0 and TRG1, TRG2 is reserved.
TRG0
TRG1
2
1
3
4
5
Capture
Update der Daten
Figure 4: Trigger signals
Lines have LVTTL level
io
H and
io
L
max.
12 mA
V
CC
=3.3
±
0.3V
Symbol
Parameter
Min
Max
Unit
1
Time for early update
20
ns
2
Time for late update
20
ns
3
Time to second clock
40
ns
4
unstress clock high time
40
ns
5
Time between update and capture
40
ns
Table: Min. Timing for Trigger signals
Summary of Contents for SFX-TAP2/C
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