Digital Output - Agilent Technologies 34972A User Manual

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.
Output
• 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 internal +5V 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.
+5 V
10 k
I/O Line
(1 of 16)
0.2
Chapter 7 Tutorial
Multifunction Module
External Circuit
4
+V
315
7