15ꢀk EꢁDꢂ-rotected UꢁB Transceivers
-in Description
ꢀIN
NAM
FUNCTION
THIN
QFNꢄ ꢀ
TEEOꢀ
ꢁigital I/O Connections Logic Supply. Connect a +1.65V to +3.6V supply to V . Bypass V to
L
L
1
2
3
4
5
15
V
L
GNꢁ with a 0.1µF ceramic capacitor.
Speed-Selector Input. Connect SPꢁ to GNꢁ to select the low-speed data rate (1.5Mbps).
Connect SPꢁ to V to select the full-speed data rate (12Mbps).
1
2
3
4
SPꢁ
RCV
VP
L
ꢁifferential-Receiver Output. RCV responds to the differential input on ꢁ+ and ꢁ- (Tables 3 and
4). RCV asserts low if SUS = V .
L
Receiver Output/ꢁriver Input. VP functions as a receiver output when OE = V . VP duplicates ꢁ+
L
when receiving. VP functions as a driver input when OE = GNꢁ.
Receiver Output/ꢁriver Input. VM functions as a receiver output when OE = V . VM duplicates ꢁ-
L
VM
when receiving. VM functions as a driver input when OE = GNꢁ.
No Connection. Not internally connected.
Ground
6
7
5, 8, 16
6
N.C.
GNꢁ
Suspend Input. ꢁrive SUS low for normal operation. ꢁrive SUS high to put the MAX3450E/
MAX3451E/MAX3452E into suspend mode. RCV asserts low in suspend mode. VP and VM
remain active in suspend mode.
8
9
7
9
SUS
OE
ꢁ-
Output Enable. ꢁrive OE to GNꢁ to enable the transmitter outputs. ꢁrive OE to V to disable the
L
transmitter outputs. OE also controls the I/O direction of VP and VM (Tables 3 and 4).
USB Input/Output. For OE = GNꢁ, ꢁ- functions as a USB output, with VM providing the input signal. For
OE = V , ꢁ- functions as a USB input, with VM functioning as a single-ended receiver output. Connect a
10
10
L
1.5ꢀΩ resistor from ꢁ- to V
for low-speed (1.5Mbps) operation (MAX3450E and MAX3452E).
TRM
USB Input/Output. For OE = GNꢁ, ꢁ+ functions as a USB output, with VP providing the input signal. For
OE = V , ꢁ+ functions as a USB input, with VP functioning as a single-ended receiver output. Connect
11
12
11
12
ꢁ+
L
a 1.5ꢀΩ resistor from ꢁ+ to V
for full-speed (12Mbps) operation (MAX3450E and MAX3452E).
TRM
01/MAX3452E
Internal Regulator Output. V
provides a regulated +3.3V output. Bypass V
to GNꢁ with a
TRM
TRM
1µF (min) ceramic capacitor as close to the device as possible. V
normally derives power
TRM
V
from V
. Alternatively, drive V
directly with a +3.3V 10% supply (MAX3450E and MAX3451E).
TRM
BUS
TRM
V
provides power to internal circuitry and provides the pullup voltage for an external USB
TRM
pullup resistor (MAX3450E and MAX3452E). ꢁo not use V
to power external circuitry.
TRM
N.C.
No Connection. Not internally connected (MAX3450E).
Enumerate Function Selection Input (MAX3451E). ꢁrive ENUM to V to connect the internal 1.5ꢀΩ
L
resistor between V
and ꢁ+ or ꢁ-, depending on the SPꢁ state. ꢁrive ENUM to GNꢁ to
TRM
ENUM
disconnect the internal 1.5ꢀΩ resistor. For SPꢁ = V , the 1.5ꢀΩ pullup resistor connects to ꢁ+.
13
13
L
For SPꢁ = GNꢁ, the 1.5ꢀΩ pullup resistor connects to ꢁ-.
Bus-ꢁetection Output (MAX3452E). The push-pull Bꢁ output asserts low and the device enters
Bꢁ
sharing mode if V
< +3.6V. Bꢁ asserts high if V
> +4.0V.
BUS
BUS
USB Power-Supply Input. Connect a +4.0V to +5.5V power supply to V
. V
BUS BUS
provides power
to the internal linear regulator. Bypass V
to GNꢁ with a 0.1µF ceramic capacitor as close to
together when powering the MAX3450E or
TRM
BUS
14
—
14
—
V
BUS
the device as possible. Connect V
and V
BUS
MAX3451E with an external power supply (+3.3V 10%).
EP
Exposed Pad. Connect exposed pad to ground.
6
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