User's Guide

UC864-E-AUTO / AWS-AUTO Hardware User Guide
1vv0300795 Rev.11 – 2010/11/18
Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights Reserved. Page 39 of 78
9.1. USB transceiver specifications
This is the on-chip USB transceiver specifications
Parameter
ParameterParameter
Parameter Comments
CommentsComments
Comments Min
MinMin
Min Typ
TypTyp
Typ Max
MaxMax
Max Unit
UnitUnit
Unit
USB_VBUS
USB_VBUSUSB_VBUS
USB_VBUS :
::
:
Supply Voltage 4.5 5.0 5.25 V
Supply Current 25 mA
Input Lev
Input LevInput Lev
Input Levels for Low
els for Lowels for Low
els for Low-
--
-/full
/full/full
/full-
--
-speed :
speed :speed :
speed :
Receiver Threshold (single-end) 0.8 2.0 V
Differential Input Sensitivity |D+ - D-|, V
IN
= 0.8V to 2.5V 0.2 V
Differential Common-mode Range Includes V
DI
0.8 2.5 V
Output Levels for Low
Output Levels for LowOutput Levels for Low
Output Levels for Low-
--
-/full
/full/full
/full-
--
-speed :
speed :speed :
speed :
Low R
L
= 1.5 kΩ to 3.6 V 0.3 V
High R
L
= 15 kΩ to GND 2.8 3.6 V
Output Signal Crossover Voltage 1.3 2.0 V
Terminations :
Terminations :Terminations :
Terminations :
Internal pull-up resistor V
TRM
to D+, V
TRM
to D- 1.425 1.5 1.575 kΩ
Internal pull-down resistor D+ to GND, D- to GND 14.3 15 24.8 kΩ
High-Z state output impedance
0 V < V
D
< 3.6V; measured at D+
and D- pins to GND
300 kΩ
Termination Voltage An internal supply voltage, V
TRM
3.0 3.3 3.6 V
Driver
Driver Driver
Driver c
cc
characteristics
haracteristics haracteristics
haracteristics –
––
– F
FF
Full speed
ull speedull speed
ull speed
Transition time :
Rise time
Fall time
C
L
= 50 to 125 pF
C
L
= 50 to 125 pF
4
4
20
20
ns
ns
Rise/fall time matching 90 111 %
Series output resistance D+, D- 28 33 44
Ω
Driver characteristics
Driver characteristics Driver characteristics
Driver characteristics –
––
– L
LL
Low speed
ow speedow speed
ow speed
Transition time :
Rise time
Fall time
C
L
= 50 to 600 pF
C
L
= 50 to 600 pF
75
75
300
300
ns
ns
Rise/fall time matching 80 125 %
USB_ID (for future use only)
USB_ID (for future use only)USB_ID (for future use only)
USB_ID (for future use only)
ID pin pull-up resistance 108 140 182 kΩ
A device detection threshold t
delay
< 1 us, V
hys
= 50mV
0.15*V
TRM
V
B device detection threshold t
delay
< 1 us, V
hys
= 50mV
0.8*V
TRM
V