Digital Input/Output; External Trigger; Counter; Non-Volatile Memory - Measurement Computing USB-1208LS User Manual

USB-1208LS User's Guide

Digital input/output

Digital type
Number of I/O
Configuration
Pull up/pull-down configuration
Input high voltage
Input low voltage
Output high voltage (IOH = -2.5 mA)
Output low voltage (IOL = 2.5 mA)

External trigger

Parameter
Trigger source (Note 4)
Trigger mode
Trigger latency
Trigger pulse width
Input high voltage
Input low voltage
Input leakage current
TRIG_IN is protected with a 1.5KOhm series resistor.
Note 4:

Counter

Counter type
Number of channels
Input source
Input type
Resolution
Schmidt trigger hysteresis
Input leakage current
Maximum input frequency
High pulse width
Low pulse width
Input low voltage
Input high voltage

Non-volatile memory

Memory size
Memory configuration
82C55
16 (Port A0 through A7, Port B0 through B7
2 banks of 8
All pins pulled up to Vs via 47K resistors (default). Positions available
for pull down to ground. Hardware selectable via zero ohm resistors as a
factory option.
2.0 V min, 5.5 V absolute max
0.8 V max, –0.5 V absolute min
3.0 V min
0.4 V max
Conditions
External digital
Software selectable
Burst
Burst
Event counter
1
CTR screw terminal
TTL, rising edge triggered
32 bits
20 mV to 100 mV
±1 µA
1 MHz
500 ns min
500 ns min
0 V min, 1.0 V max
4.0 V min, 15.0 V max
8192 bytes
Address Range Access
0x0000 – 0x17FF Read/Write
0x1800 – 0x1EFF Read/Write
0x1F00 – 0x1FEF Read/Write
0x1FF0 – 0x1FFF Read/Write
Specification
TRIG_IN
Level sensitive: user configurable for
TTL level high or low input.
25 µs min, 50 µs max
40 µs min
3.0 V min, 15.0 V absolute max
0.8 V max
±1.0 µA
Description
A/D data (4K samples)
User data area
Calibration data
System data
4-3
Specifications