1ꢀ5k EꢁDꢂ-rotected UꢁB Transceivers with
External/Internal -ullup Resistors
Detailed Description
Applications Information
The MAX13481E/MAX13482E/MAX13483E 15kV ESD-
protected USB-compliant transceivers convert single-
ended or differential logic-level signals to USB signals,
and USB signals to single-ended or differential logic
signals. These devices fully comply to USB 2.0 when
-owerꢂꢁupply Configurations
Normal Operating Mode
Connect V and V
to system power supplies (Table 1).
L
BUS
Connect V to a +1.6V to +3.6V supply. Connect V
L
BUS
connector.
to a +4.0V to +5.5V supply or to the V
BUS
operating at full-speed (12Mbps), and operate with V
L
as low as 1.6V, ensuring compatibility with low-voltage
ASICs. Integrated 15kV ESD-circuitry protection pro-
tects D+ and D- bus connections.
Alternatively, these parts can derive power from a sin-
gle Li+ cell. Connect the battery to V . V remains
BUS TRM
as low as +3.1V. Additionally, the
above +3.0V for V
BUS
devices can be powered by an external +3.3V 10%
voltage regulator. Connect V and V to an exter-
The MAX13481E/MAX13483E require an external 1.5kΩ
BUS
TRM
pullup resistor to V
for full-speed operation. The
TRM
nal +3.3V voltage regulator. V
no longer consumes
BUS
MAX13481E requires an external 1.5kΩ pullup resistor
and feature an active-low enumeration function that
connects a +3.3V voltage at VPU. The MAX13482E fea-
tures an active-low enumeration function that connects
a 1.5kΩ pullup resistor at VPUR for full-speed opera-
tion. The MAX13482E/MAX13483E also provide a bus
current to power the internal linear regulator in this con-
figuration. The bus detect function (BD) on the
MAX13482E and MAX13483E does not function when
the device is powered this way.
Disable Mode
detect (BD) output that asserts high when V
> 3.6V.
BUS
Connect V
to a system power supply and leave V
L
BUS
unconnected or connect to GND. D+ and D- enter a tri-
state mode and V (or V and V ) consumes
BUS
BUS
TRM
less than 20µA of supply current. D+ and D- withstand
external signals up to +5.5V in disable mode (Table 2).
Table 1. Power-Supply Configuration
V
(V)
V
(V)
V (V)
L
CONFIGURATION
Normal mode
NOTES
—
BUS
TRM
+4.0 to +5.5
+4.0 to +5.5
GND or floating
+3.1 to +4.5
+3.0 to +3.6
+3.0 to +3.6 output
+3.0 to +3.6 output
High Z
+1.6 to +3.6
GND or floating
+1.6 to +3.6
+1.6 to +3.6
+1.6 to +3.6
Disable mode
Table 2
Table 2
Sharing mode
+3.0 to +3.6 output
+3.0 to +3.6 input
Battery supply
—
Voltage regulator supply
Table 2. Disable-Mode and Sharing-Mode Connection
INPUTS/OUTPUTS
/ V
DISABLE MODE
4V to 5.5V
SHARING MODE
V
Floating or connected to GND
1.6V to 3.6V input
BUS
TRM
V
Floating or connected to GND
High impedance
L
D+ and D-
VP and VM
RCV
High impedance
For OE = low, high impedance
For OE = high, output logic high
Undefined
Invalid*
Invalid*
Invalid*
BD
Low
(MAX13482E/MAX13483E)
*High impedance or logic low
8
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