參數(shù)資料
型號： MAX3455E
廠商： Maxim Integrated Products, Inc.
英文描述： ?5kV ESD-Protected USB Transceivers
中文描述： ±15kV ESD保護(hù)、USB收發(fā)器
文件頁數(shù)： 12/19頁
文件大?。?/td> 366K
代理商： MAX3455E
M
±15kV ESD-Protected USB Transceivers
12
______________________________________________________________________________________
SPD (MAX3454E/MAX3455E/MAX3456E)
SPD sets the transceiver speed. Connect SPD to GND
to select the low-speed data rate (1.5Mbps). Connect
SPD to V
L
to select the full-speed data rate (12Mbps).
The MAX3454E provides an internal pullup resistor for
selecting the bus speed. The MAX3455E and
MAX3456E require an external pullup resistor to D+ or
D- to set the bus speed. Connect the 1.5k
resistor
between D+ and V
TRM
to set the full-speed (12Mbps)
data rate, or connect the 1.5k
resistor between D- and
V
TRM
to set the low-speed (1.5Mbps) data rate.
SUS
The SUS state determines whether the MAX3453E
–
MAX3456E operate in normal mode or in suspend
mode. Connect SUS to GND to enable normal opera-
tion. Drive SUS high to enable suspend mode. RCV
asserts low and VP and VM remain active in suspend
mode (Tables 3 and 4). Supply current decreases in
suspend mode (see the
Electrical Characteristics
).
BD (MAX3453E/MAX3455E)
The push-pull bus detect (BD) output monitors V
BUS
and asserts high if V
BUS
is greater than +4.0V. BD
asserts low if V
BUS
is less than +3.6V and the
MAX3453E/MAX3455E enters sharing mode (Table 2).
V
TRM
An internal linear regulator generates the V
TRM
voltage
(+3.3V, typ). V
TRM
derives power from V
BUS
(see the
Power-Supply Configurations
section). V
TRM
powers the
internal portions of the USB circuitry and provides the
pullup voltage for an external USB pullup resistor
(MAX3455E/MAX3456E). Bypass V
TRM
to GND with a
1μF ceramic capacitor as close to the device as possible.
Do not use V
TRM
to provide power to external circuitry.
D+ and D-
D+ and D- serve as bidirectional bus connections and
are ESD protected to
±
15kV (Human Body Model). For
OE
= low, D+ and D- serve as transmitter outputs. For
OE
= high, D+ and D- serve as receiver inputs.
V
BUS
For most applications, V
BUS
connects to the V
BUS
termi-
nal on the USB connector (see the
Power-Supply
Configurations
section). V
BUS
can also connect to an
external supply as low as +3.1V (MAX3454E/MAX3456E).
Drive V
BUS
low to enable sharing mode. Bypass V
BUS
to
GND with a 0.1μF ceramic capacitor as close to the
device as possible.
External Components
External Resistors
Proper USB operation requires two external resistors,
each 27
±
1%, 1/8W (or greater). Install one resistor in
series between D+ of the MAX3453E
–
MAX3456E and
D+ on the USB connector. Install the other resistor in
series between D- of the MAX3453E
–
MAX3456E and D-
on the USB connector (see
Typical Operating Circuit
).
The MAX3455E/MAX3456E require an external 1.5k
pullup resistor between V
TRM
and D+ or D- to set the
bus speed.
External Capacitors
The MAX3453E
–
MAX3456E require three external
capacitors for proper operation. Bypass V
L
to GND with a
0.1μF ceramic capacitor. Bypass V
BUS
to GND with a
0.1μF ceramic capacitor. Bypass V
TRM
to GND with a
1μF (min) ceramic capacitor. Install all capacitors as
close to the device as possible.
Data Transfer
Transmitting Data to the USB
The MAX3453E
–
MAX3456E transmit data to the USB
differentially on D+ and D-. VP and VM serve as differ-
ential input signals to the driver (Tables 3a and 3b).
Receiving Data from the USB
To receive data from the USB, drive
OE
high and SUS
low. Differential data received by D+ and D- appears
as a differential logic signal at RCV. Single-ended
receivers on D+ and D- drive VP and VM, respectively
(Tables 4a and 4b).
Figure 2. Timing of VP and VM to D+ and D-
VM
VP
D-
D+
t
PLH_DRV
t
PHL_DRV
V
CRS_F
, V
CRS_L
VP AND VM RISE/FALL TIMES < 4ns
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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