MAX3453EETE Maxim Integrated, MAX3453EETE Datasheet - Page 11

• Manufacturer Part Number: MAX3453EETE
• Description: USB Interface IC
• Manufacturer: Maxim Integrated

Specifications of MAX3453EETE

• Operating Supply Voltage: 4 V to 5.5 V
• Operating Supply Current: 2.5 mA

Connect V
unconnected or connect to GND. D+ and D- enter a tri-
state mode and V
less than 20µA of supply current. D+ and D- withstand
external signals up to +5.5V in disable mode (Table 2).
Connect V
(or V
D+ and D- enter a tri-state mode, allowing other circuitry
to share the USB D+ and D- lines, and V
than 20µA of supply current. D+ and D- withstand
external signals up to +5.5V in sharing mode (Table 2).
OE controls the direction of communication. Drive OE
low to transfer data from the logic side to the USB side.
For OE = low, VP and VM serve as differential driver
inputs to the USB transmitter.
Drive OE high to transfer data from the USB side to the
logic side. For OE = high, VP and VM serve as single-
ended receiver outputs from the USB inputs
(D+ and D-). RCV serves as a differential receiver out-
put, regardless of the state of OE.
The MAX3453E/MAX3454E feature an enumerate func-
tion that allows software control of USB enumeration.
USB protocol requires a 1.5kΩ pullup resistor to D+ or
D- to indicate the transmission speed to the host (see
the SPD section). The MAX3453E/MAX3454E provide
an internal 1.5kΩ pullup resistor. Disconnect the pullup
resistor from the circuit to simulate the removal of a
device from the USB. Drive ENUM low to disconnect
the internal pullup resistor. Drive ENUM high to connect
the internal pullup resistor. The SPD state (MAX3454E
only) determines whether the pullup resistor connects
to D+ or D-. For ENUM = high, the internal pullup resis-
tor connects to D+ when SPD = V
when SPD = GND (low speed). The MAX3453E only
supports full-speed operation; therefore, the pullup
resistor only connects to D+ or is disconnected.
Figure 1. Rise and Fall Times
V
V
OHD
OLD
BUS
and V
BUS
L
to a system power supply and leave V
t
FR
to a system power supply and leave V
, t
TRM
10%
LR
______________________________________________________________________________________
BUS
±15kV ESD-Protected USB Transceivers
) unconnected or connect to GND.
90%
ENUM (MAX3453E/MAX3454E)
(or V
BUS
and V
L
90%
(full speed) or to D-
Device Control
L
TRM
10%
t
Sharing Mode
consumes less
FF
Disable Mode
, t
LF
) consumes
BUS
OE
L
Table 3a. Transmit Truth Table
(OE = 0, SUS = 0)
X = Undefined.
Table 3b. Transmit Truth Table
( OE = 0, SUS = 1)
Table 4a. Receive Truth Table
( OE = 1 and SUS = 0)
X = Undefined.
Table 4b. Receive Truth Table
( OE = 1 and SUS = 1)
D+
VP
0
0
1
1
VP
D+
0
0
1
1
INPUTS
0
0
1
1
0
0
1
1
INPUTS
INPUTS
INPUTS
VM
D-
0
1
0
1
VM
0
1
0
1
D-
0
1
0
1
0
1
0
1
VP
D+
0
0
1
1
VP
D+
0
0
1
1
0
0
1
1
0
0
1
1
OUTPUTS
OUTPUTS
OUTPUTS
OUTPUTS
VM
D-
0
1
0
1
VM
0
1
0
1
D-
0
1
0
1
0
1
0
1
RCV
RCV
RCV
RCV
X
0
1
X
X
X
0
1
0
0
0
0
0
0
0
0
OUTPUT STATE
OUTPUT STATE
OUTPUT STATE
OUTPUT STATE
Undefined
Undefined
Undefined
Undefined
Logic 0
Logic 1
Logic 0
Logic 1
Logic 0
Logic 1
Logic 0
Logic 1
SE0
SE0
SE0
SE0
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