Data Translation DT330 Series, Руководство пользователя

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Specifications
85
Digital I/O Specifications
Table 27 lists the digital input and digital output specifications for the DT330 Series boards.
Table 27: Digital Input and Digital Output Specifications
Feature
Ports A, B, and C
Specifications
Port D
Specifications
Number of lines 8 per port 8
Direction bidirectional
Termination 22 k
Ω
resistor pullup to +5 V; 22
Ω
series resistor
Inputs
Input type:
Input load:
High-level input voltage:
Low-level input voltage:
High-level input current:
Low-level input current:
Level sensitive
2 FCT2574 (TTL)
2.0 V minimum
0.8 V maximum
3
μ
A
–3
μ
A
Level sensitive
3 FCT2574 (TTL)
2.0 V minimum
0.8 V maximum
4.5
μ
A
4.5
μ
A
Minimum Pulse Width
High:
Low:
Not Applicable
Not Applicable 66 ns (2 PCI clocks)
a
66 ns (2 PCI clocks)
a
a. The minimum pulse width applies only to interrupt-on-change detection. Pulses less than the
minimum may not be detected as a change.
Outputs
Output driver:
Output driver high voltage:
Output driver low voltage:
FCT2574 (TTL)
2.4 V minimum (IOH = –15 mA);
0.5 V maximum (IOL = 12 mA)
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