Keithley KPCI-3110, Руководство пользователя

Страница: 105 / 158

KPCI-3110 and KPCI-3116 User’s Manual Specifications A-7
Table A-4 lists the specifications for the C/T subsystems on the KPCI-3110 and KPCI-3116
boards.
Table A-4
C/T subsystem specifications
Feature Specifications
Number of counter/timers 4
Clock Inputs
Input type:
Input load:
High-level input voltage:
Low-level input voltage:
Hysteresis:
High-level input current:
Low-level input current:
Minimum pulse width:
Maximum frequency:
Termination:
Schmitt trigger, rising-edge sensitive
1 HCT14 (TTL)
2.0V minimum
0.8V maximum
0.4V (minimum); 1.5V (maximum)
1.0
µ
A
−
1.0
µ
A
100ns (high); 100ns (low)
5.0MHz
22k
Ω
resistor pullup to +5V
Gate Inputs
Input type:
Input load:
High-level input voltage:
Low-level input voltage:
Hysteresis:
High-level input current:
Low-level input current:
Minimum pulse width:
Maximum frequency:
Termination:
Schmitt trigger, level sensitive
1 HCT14 (TTL)
2.0V minimum
0.8V maximum
0.4V (minimum); 1.5V (maximum)
1.0
µ
A
−
1.0
µ
A
100ns (high); 100ns (low)
5.0MHz
22k
Ω
resistor pullup to +5V
Counter Outputs
Output driver:
Output driver high voltage:
Output driver low voltage:
Termination:
ALS244 (TTL)
2.0V minimum (I
OH
=
−
15mA);
2.4V minimum (I
OH
=
−
3mA)
0.5V maximum (I
OL
= 24mA);
0.4V maximum (I
OL
= 12mA)
22
Ω
series resistor