MAX3450EEUD+ Maxim Integrated Products, MAX3450EEUD+ Datasheet - Page 9

• Manufacturer Part Number: MAX3450EEUD+
• Description: TXRX USB +/-15KV ESD 14-TSSOP
• Manufacturer: Maxim Integrated Products
• Type: Transceiverr

Specifications of MAX3450EEUD+

• Number Of Drivers/receivers: 1/1
• Protocol: USB 2.0
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 14-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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 MAX3451E features an enumerate function that
allows software control of USB enumeration. USB proto-
col requires a 1.5kΩ pullup resistor to D+ or D- to indi-
cate the transmission speed to the host (see the SPD
section). The MAX3451E provides an internal 1.5kΩ
pullup resistor. Remove the pullup resistor from the cir-
cuit to simulate a device disconnect from the USB. Drive
ENUM low to disconnect the internal pullup resistor.
Drive ENUM high to connect the internal pullup resistor.
The SPD state determines whether the pullup resistor
connects to D+ or D-. For ENUM = high, the internal
1.5kΩ pullup resistor connects to D+ when SPD = V
(full speed) or to D- when SPD = GND (low speed).
SPD sets the transceiver speed. Connect SPD to GND to
select the low-speed data rate (1.5Mbps). Connect SPD
to V
MAX3451E provides an internal pullup resistor for
selecting the bus speed. The MAX3450E and
MAX3452E require an external pullup resistor to D+ or
D- to set the bus speed. Connect the 1.5kΩ resistor
between D+ and V
data rate, or connect the 1.5kΩ resistor between D- and
V
Figure 1. Rise and Fall Times
TRM
V
V
OHD
OLD
L
to set the low-speed (1.5 Mbps) data rate.
to select the full-speed data rate (12Mbps). The
t
FR
10%
, t
LR
_______________________________________________________________________________________
±15kV ESD-Protected USB Transceivers
TRM
90%
to set the full-speed (12Mbps)
ENUM (MAX3451E)
90%
Device Control
t
FF
10%
, t
LF
SPD
OE
L
The SUS state determines whether the MAX3450E/
MAX3451E/MAX3452E operate in normal mode or in
suspend mode. Connect SUS to GND to enable normal
operation. Drive SUS high to enable suspend mode.
RCV asserts low and VP and VM remain active in sus-
pend mode (Tables 3 and 4). Supply current decreases
in suspend mode (see the Electrical Characteristics ).
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.
VP
VP
D+
0
0
1
1
0
0
1
1
0
0
1
1
INPUTS
INPUTS
INPUTS
VM
VM
D-
0
1
0
1
0
1
0
1
0
1
0
1
VP
D+
D+
0
0
1
1
0
0
1
1
0
0
1
1
OUTPUTS
OUTPUTS
OUTPUTS
VM
D-
D-
0
1
0
1
0
1
0
1
0
1
0
1
RCV
RCV
RCV
X
0
1
X
0
0
0
0
X
0
1
X
OUTPUT STATE
OUTPUT STATE
OUTPUT STATE
Undefined
Undefined
Undefined
Logic 0
Logic 1
Logic 0
Logic 1
Logic 0
Logic 1
SE0
SE0
SE0
SUS
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