2/Theory of Operation
2-15
together provide a regulated output with high current sinking
capability. Typical current seen by these regulators can vary from 10 to
40 mA. The approximate VHI and VLO levels generated are listed in Table
2-3.
Table 2-3. VHI and VLO for TTL and CMOS Logic Levels
_____________________________________________________________
DESC THRSH VHI VLO
_____________________________________________________________
TTL 1 -1.05V -2.45V
CMOS 0 -0.25V -2.25V
_____________________________________________________________
A voltage level-detection system in the custom chip uses data inputs,
VHI, and VLO voltage levels to detect a high voltage input, a low
voltage input, or a tri-state condition. See Figure 2-8 for an
illustration of the detection circuitry contained in the custom chip.
NOTE
The actual input thresholds for the high and low
comparators are computed from the formulas shown
in Figure 2-8.
Figure 2-8. Custom Chip Voltage Level Detection
Multi-Detection and Interrupt
The Vector Output I/O Module accepts different sizes of clip modules. A
detection system within the module informs the mainframe as to the size
of the clip that has been installed on the module. Clip modules are
available in a half-size module and a full-size module. The half-size
module plugs into one connector (either J1 or J2 on the Top PCA), and
Содержание 9100 Series
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