miniLAB 1008 User's Guide
Specifications
Digital Input / Output (DB37)
Digital type
82C55
Number of I/O
24 (Port A0 through Port C7)
Configuration
2 banks of 8 and 2 banks of 4, or 3 banks of 8
Pull up/pull-down configuration
All pins pulled up to Vs via 47 k resistors (default).
Positions available for pull down to ground.
Hardware selectable via zero ohm resistor.
Input high voltage
2.0 V min, 5.5 V absolute max
Input low voltage
0.8 V max, –0.5 V absolute min
Output high voltage (IOH = -2.5 mA)
3.0 V min
Output low voltage (IOL = 2.5 mA)
0.4 V max
External Trigger
Parameter Conditions
Specification
Trigger source
External digital
DIO[3:0], only DIO may be selected as a trigger
input
Trigger mode
Software
selectable
Level sensitive: user configurable for TTL level high
or low input.
Trigger latency
Burst
25 µs min, 50 µs max
Trigger pulse width
Burst
40 µs min
Input high voltage
3.0 V min, 15.0 V absolute max
Input low voltage
0.8 V max
Input leakage
current
±1.0
µA
Counter Section
Counter type
Event counter
Number of channels
1
Input source
CTR screw terminal
Resolution 32
bits
Schmidt trigger hysteresis
20 mV to 100 mV
Input leakage current
±1 µA
Maximum input frequency
1 MHz
High pulse width
500 ns min
Low pulse width
500 ns min
Input low voltage
0 V min, 1.0 V max
Input high voltage
4.0 V min, 15.0 V max
6-4