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Appendix A: Specifications
VX4101A MultiPaq Instrument User Manual
A–25
Digital Input and Output (Option 1D)
Table A–58: Digital Input Characteristics
Characteristic Description
Number Of Pins 32 (shared with Digital Output)
Input/Output Selectability Each pin in individually useable as an input pin, as and output pin, or as a bidirectional
open collector pin
Threshold Level * 0.01 - 20.00 V, programmable in 5 mV steps
Accuracy (typical)
±(40 mV + 0.8% of setting), 1 year
Input Loading 8.25 K pullup to selected Digital Output excitation (5 VDC, 12 VDC, 24 VDC or external)
additional nominal 23.0 K load to 5 VDC or 0 VDC depending on input level (all excitation
selections)
Hysteresis .12 VDC nominal
External Handshake Characteristics Request TTL compatible (with 1 KW pullup), minimum pulse width = 50 nsec,
programmable active high or low (default). Request input must be in the inactive state
prior to selecting Handshake as the trigger source, input data setup 0, hold time,
5.3 msec of the Request pulse leading edge.
Acknowledge output pulse, TTL compatible, 1.04 msec pulse width, programmable, high
or low (default), the Acknowledge pulse leading edge may be used to indicate that the
input hold time has been met.
Clock
*
External handshake (48 kHz maximum) or internal (3.662 Hz to 48 kHz)
Memory
*
4095 maximum prematch, 4096 maximum postmatch
* Must be identical for all 32 bits
Table A–59: Digital Output Characteristics
Characteristic Description
Number Of Pins 32 (shared with Digital Input)
Input/Output Selectability Each pin in individually useable as an input pin, as and output pin, or as a bidirectional
open collector pin
Output Level
*
+5 V, +12 V, +24 V, or user-supplied (+5 V to +32 V)
Output Sink Current 50 mA maximum at V
CESAT
of 0.4 VDC maximum.
Source Current The following assumes the Digital Input instrument threshold is set to 50% (or less) of the
Digital Output excitation level:
5 VDC excitation, 240 mA at 3.5 VDC
12 VDC excitation, 350 mA at 8.0 VDC
24 VDC excitation, 500 mA at 16.0 VDC
Rise/Fall Time 5.21 msec, 10 % to 90%, 90% to 10%
Memory * 4096 samples
Clock* External handshake (48 kHz maximum) or internal (3.662 Hz to 48 kHz)