1ꢀ5k EꢁDꢂ-rotected UꢁB Transceivers with
External/Internal -ullup Resistors
-in Description (continued)
PIN
NAME
FUNCTION
Receiver Output/Driver Input. VM functions as a receiver output when OE = V . VM
duplicates D- when receiving. VM functions as a driver input when OE = GND.
L
4
4
4
VM
Active-Low Enumerator-Function-Selection Input. ENUM controls the pullup resistor or
switch connection. See the ENUM section.
5
6
5
6
—
6
ENUM
GND
Ground
Suspend Input. Drive SUS low for normal operation. Drive SUS high for low-power state.
RCV asserts low and D+/ D- are high impedance in suspend mode. VP and VM remain
active in suspend mode.
7
9
7
9
7
9
SUS
OE
D-
Output Enable. Drive OE to GND to enable the D+/D- transmitter outputs. Drive OE to V to
L
disable the transmitter outputs. OE also controls the I/O directions of VP and VM (see
Tables 3 and 4).
USB Input/Output. For OE = GND, D- functions as a USB output with VM providing the input
10
11
10
11
10
11
signal. For OE = V , D- functions as a USB input with VM functioning as a single-ended
L
receiver output.
USB Input/Output. For OE = GND, D+ functions as a USB output with VP providing the
input signal. For OE = V , D+ functions as a USB input with VP functioning as a single-
D+
L
ended receiver output.
Regulated Output Voltage. V
provides a 3.3V output derived from V
. Bypass V
TRM
BUS
TRM
TRM
to GND with a 1µF (min) low-ESR capacitor such as ceramic or plastic film types. V
provides power to internal circuitry, the internal D+ pullup resistor, VPU and VPUR. Do not
use V to power external circuitry.
12
12
12
V
TRM
TRM
Pullup Voltage. For ENUM = GND, VPU is pulled to an internal 3.3V voltage. Connect a
13
—
—
—
—
13
—
13
—
VPU
I.C.
1.5kΩ resistor between D+ and VPU for full-speed operation. For ENUM = V , VPU is high
impedance.
L
Internally Connected. Leave open. Do not connect to external circuitry.
Internal Pullup Resistor. VPUR is pulled to an internal 3.3V voltage through a 1.5kΩ resistor
VPUR (ENUM = GND). Connect VPUR to D+ for full-speed operation. For ENUM = V , VPU is
L
high impedance.
USB-Side Power-Supply Input. Connect a +4V to +5.5V power supply to V
. V
BUS BUS
supplies power to the internal regulator. Bypass V
to GND with a 1µF ceramic
BUS
14
15
14
15
14
15
V
BUS
capacitor. Connect V
and V
together when powering the MAX13481E/MAX13482E/
TRM
BUS
MAX13483E with an external power supply.
Digital Input/Output Connection Logic Supply. Connect a +1.6V to +3.6V supply to V .
Bypass V to GND with a 0.1µF (min) low-ESR ceramic capacitor.
L
L
V
L
—
16
EP
16
EP
BD
EP
USB Detector Output (Push/Pull). A high at BD signals to the ASIC that V
Exposed Paddle. Connect EP to GND.
is present.
BUS
EP
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7
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
