Owner's manual

Appendixes
61
Output Drive Characteristics:
Parameter Test conditions Result
Output Drive Current VO = 2.5V -32 mA per pin
-180 mA per port
Output High Voltage IOH = -3 mA 3.5V typ, 4.8V max
Output High Voltage IOH = -15 mA 3.5V typ, 4.7V max
Output High Voltage IOH = -32 mA 2.4V min, 3.0V typ
Output Low Voltage IOL = 64 mA 0.2V typ, 0.55V max
I/O Power Off Leakage V I/O @ 4.5V ±1 µA max
Counter/Timer Specifications:
The following conditions apply:
T
A = –40°C to +100°C; C load = 50pF + 2 TTL loads
Parameter Value
Number of Channels 3
Resolution 24 bits
Maximum Frequency 16.5 MS/s for external clock and
33 MS/s for internal DSP clock
Minimum Frequency
0.00002 S/s for internal clock, no
low limit for external clock
Minimum Pulse Width 20 ns
Output High Level 2.0V min @ -4 mA
Output Low Level 0.5V max @ 4 mA
Protection
7 kV ESD,
±30V overshoot/undershoot
Input Low Voltage 0.0–0.8V
Input High Voltage 2.0–5.0V
Note The maximum event stream rate for –CT boards are
1.2 MS/s.