MAX13481E Datasheet, PDF (8/19 Pages) Maxim Integrated Products – ±15kV ESD-Protected USB Transceivers with External/Internal Pullup Resistors

±15kV ESD-Protected USB Transceivers with
External/Internal Pullup Resistors
Detailed Description
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
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.
The MAX13481E/MAX13483E require an external 1.5kΩ
pullup resistor to V_TRM for full-speed operation. The
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
detect (BD) output that asserts high when V_BUS > 3.6V.
Applications Information
Power-Supply Configurations
Normal Operating Mode
Connect V_L and V_BUS to system power supplies (Table 1).
Connect V_L to a +1.6V to +3.6V supply. Connect V_BUS
to a +4.0V to +5.5V supply or to the V_BUS connector.
Alternatively, these parts can derive power from a sin-
gle Li+ cell. Connect the battery to V_BUS. V_TRM remains
above +3.0V for V_BUS as low as +3.1V. Additionally, the
devices can be powered by an external +3.3V ±10%
voltage regulator. Connect V_BUS and V_TRM to an exter-
nal +3.3V voltage regulator. V_BUS no longer consumes
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
Connect V_BUS to a system power supply and leave V_L
unconnected or connect to GND. D+ and D- enter a tri-
state mode and V_BUS (or V_BUS and V_TRM) consumes
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_BUS (V)
+4.0 to +5.5
+4.0 to +5.5
GND or floating
+3.1 to +4.5
+3.0 to +3.6
V_TRM (V)
+3.0 to +3.6 output
+3.0 to +3.6 output
High Z
+3.0 to +3.6 output
+3.0 to +3.6 input
V_L (V)
+1.6 to +3.6
GND or floating
+1.6 to +3.6
+1.6 to +3.6
+1.6 to +3.6
CONFIGURATION
Normal mode
Disable mode
Sharing mode
Battery supply
Voltage regulator supply
NOTES
—
Table 2
Table 2
—
Table 2. Disable-Mode and Sharing-Mode Connection
INPUTS/OUTPUTS
V_BUS / V_TRM
V_L
D+ and D-
DISABLE MODE
4V to 5.5V
Floating or connected to GND
High impedance
VP and VM
Invalid*
RCV
BD
(MAX13482E/MAX13483E)
*High impedance or logic low
Invalid*
Invalid*
SHARING MODE
Floating or connected to GND
1.6V to 3.6V input
High impedance
For OE = low, high impedance
For OE = high, output logic high
Undefined
Low
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