Chapter 5
Signal Connections
©
National Instruments Corporation
5-11
7344/7334 Hardware User Manual
Trigger Input, Shutdown Input, and Breakpoint
Output Circuits
Figures 5-5, 5-6, and 5-7 show a simplified schematic diagram of the
circuits used by the trigger inputs, shutdown inputs, and breakpoint outputs
for signal buffering.
Figure 5-5.
Trigger Input Circuit
Figure 5-6.
Shutdown Input Circuit
Figure 5-7.
Breakpoint Output Circuit
74HC244
1 k
Ω
1/8 W
From the external
connector
trigger pins
To the trigger
circuits
DGND
Vcc
3.3 k
Ω
74HC244
1 k
Ω
1/8 W
From the external
connector
shutdown pin
To the shutdown
circuits
DGND
Vcc
3.3 k
Ω
74AS760
To the external
connector
breakpoint pins
From the
breakpoint
circuits
Vcc
3.3 k
Ω
