Measurement Computing USB-1208LS - Manual (Page 22)

USB-1208LS User's Guide Specifications
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Non-volatile memory
Table 10. Memory specifications
Parameter Specification
Memory size 8192 bytes
Memory configuration Address Range Access Description
0x0000 – 0x17FF Read/Write A/D data (4K samples)
0x1800 – 0x1EFF Read/Write User data area
0x1F00 – 0x1FEF Read/Write Calibration data
0x1FF0 – 0x1FFF Read/Write System data
Power
Table 11. Power specifications
Parameter Conditions Specification
Supply current (Note 5) 20 mA
+5V USB power available (Note 6) Connected to self-powered hub 4.5 V min, 5.25 V max
Connected to bus-powered hub 4.1 V min, 5.25 V max
Output current (Note 7) Connected to bus-powered hub 450 mA min, 500 mA max
Connected to bus-powered hub 50 mA min, 100 mA max
Note 5: This is the total current requirement for the USB-1208LS which includes up to 5mA for the status
LED.
Note 6: Self-powered refers to USB hubs and hosts with a power supply. Bus-powered refers to USB hubs and
hosts without their own power supply.
Note 7: This refers to the total amount of current that can be sourced from the USB +5V, analog outputs and
digital outputs.
General
Table 12. General specifications
Parameter Conditions Specification
USB controller clock error 25 °C ±30 ppm max
0 °C to 70 °C ±50 ppm max
Device type USB 1.1 low-speed
Device compatibility USB 1.1, USB 2.0
Environmental
Table 13. Environmental specifications
Parameter Specification
Operating temperature range –0 to 70 °C
Storage temperature range –40 to 70 °C
Humidity 0 to 90% non-condensing