Measurement Specialties PMD-1024HLS - Manual (Page 20)

PMD-1024HLS User's Guide Specifications
Counter section
Table 4-2. Counter specifications
Pin name (Note 4) CTR
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
Note 4: CTR is a Schmitt trigger input
Power
Table 4-3. Power specifications
Parameter Conditions Specification
Supply current (Note 5) No Load 60 mA
Input power requirements
(Note 6) 4.75 V min, 5.25 V max
USB +5 V power available Measured at “USB +5 V” screw terminals
(pins 10,14 and 30) 4.4 V min, 5.25 V max
Connected to:
ƒ
Self-powered hub
ƒ Externally-powered root port hub
[350 mA] – [total output source
current] USB +5 V power output
current (Note 7)
Connected to
ƒ
Bus-powered hub
ƒ Battery-powered root port hub.
[60 mA] – [total output source
current]
Hold current: 350 mA, typical
Trip current: 700 mA typical
Trip/recovery time: 100 mS, max
USB +5 V overcurrent
protection Resettable fuse
On resistance: 1.3 Ohms max
Note 5:
Note 6:
Note 7:
This is the total (no load) current requirement for the PMD-1024HLS.
Bus-powered hubs are allowed to provide downstream USB power as low as 4.4 V.
Although your PMD-1024HLS will typically function at this 4.4 V minimum, guaranteed
performance requires a minimum power supply voltage of 4.75 V. All self-powered and
root port hubs will meet this 4.75 V minimum.
See available source/sink current level in the "Digital input/output" section.
4-2