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Chapter 7 Tutorial
Multifunction Module
4
7
Digital Output
The 34907A module has two non-isolated 8-bit input/output ports, which
you can use for outputting digital patterns. You can combine the two
ports to output a 16-bit word. A simplified diagram of a single output bit
is shown below.
• Each output bit is capable of directly driving up to 10 TTL loads (less
than 1 mA). The buffer for each port is used to drive a high output
from the in5V supply through the diode. The drive is rated at
+2.4V minimum at 1 mA.
• Each output bit is also an active sink, capable of sinking up to 400 mA
from an external power supply. The FET is used to sink currents and
has a nominal “on” resistance of 0.2
.
• For non-TTL logic you must provide an external pull-up. A
description of the pull-up calculation is given on the following page.
• If used with an external power supply and pull-up, the external
supply must be greater than +5 VDC and less than +42 VDC.
Output
External Circuit
+5 V
10 k
0.2
I/O Line
(1 of 16)
+V
34970A Refresh UG.book Page 315 Wednesday, February 17, 2010 12:34 PM
Summary of Contents for 34970A
Page 16: ...16 34970A Refresh UG book Page 16 Wednesday February 17 2010 12 34 PM ...
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Page 21: ...1 1 Quick Start 34970A Refresh UG book Page 21 Wednesday February 17 2010 12 34 PM ...
Page 39: ...2 2 Front Panel Overview 34970A Refresh UG book Page 39 Wednesday February 17 2010 12 34 PM ...
Page 59: ...3 3 System Overview 34970A Refresh UG book Page 59 Wednesday February 17 2010 12 34 PM ...
Page 87: ...4 4 Features and Functions 34970A Refresh UG book Page 87 Wednesday February 17 2010 12 34 PM ...
Page 217: ...5 5 Error Messages 34970A Refresh UG book Page 217 Wednesday February 17 2010 12 34 PM ...
Page 241: ...6 6 Application Programs 34970A Refresh UG book Page 241 Wednesday February 17 2010 12 34 PM ...
Page 254: ...254 34970A Refresh UG book Page 254 Wednesday February 17 2010 12 34 PM ...
Page 255: ...7 7 Tutorial 34970A Refresh UG book Page 255 Wednesday February 17 2010 12 34 PM ...
Page 324: ...324 34970A Refresh UG book Page 324 Wednesday February 17 2010 12 34 PM ...