Rainbow Electronics MAX13483E - Manual (Page 7)

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