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330 Keysight 34970A/34972A User’s Guide
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 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 0.2Ω.
– 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 kΩ
0.2Ω
I/O Line
(1 of 16)
+V
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