參數(shù)資料
型號(hào)： MAX3455EEUD
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 通用總線功能
英文描述： 【15kV ESD-Protected USB Transceivers
中文描述： LINE TRANSCEIVER, PDSO14
封裝： 4.40 MM, MO-153AB-1, TSSOP-14
文件頁(yè)數(shù)： 11/19頁(yè)
文件大?。?/td> 366K
代理商： MAX3455EEUD
M
±15kV ESD-Protected USB Transceivers
______________________________________________________________________________________
11
Disable Mode
Connect V
BUS
to a system power supply and leave V
L
unconnected or connect to GND. D+ and D- enter a tri-
state mode and V
BUS
(or V
BUS
and V
TRM
) consumes
less than 20μA of supply current. D+ and D- withstand
external signals up to +5.5V in disable mode (Table 2).
Sharing Mode
Connect V
L
to a system power supply and leave V
BUS
(or V
BUS
and V
TRM
) unconnected or connect to GND.
D+ and D- enter a tri-state mode, allowing other circuitry
to share the USB D+ and D- lines, and V
L
consumes less
than 20μA of supply current. D+ and D- withstand
external signals up to +5.5V in sharing mode (Table 2).
Device Control
OE
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
.
ENUM (MAX3453E/MAX3454E)
The MAX3453E/MAX3454E feature an enumerate func-
tion that allows software control of USB enumeration.
USB protocol requires a 1.5k
pullup resistor to D+ or
D- to indicate the transmission speed to the host (see
the
SPD
section). The MAX3453E/MAX3454E provide
an internal 1.5k
pullup resistor. Disconnect the pullup
resistor from the circuit to simulate the removal of a
device from the USB. Drive ENUM low to disconnect
the internal pullup resistor. Drive ENUM high to connect
the internal pullup resistor. The SPD state (MAX3454E
only) determines whether the pullup resistor connects
to D+ or D-. For ENUM = high, the internal pullup resis-
tor connects to D+ when SPD = V
L
(full speed) or to D-
when SPD = GND (low speed). The MAX3453E only
supports full-speed operation; therefore, the pullup
resistor only connects to D+ or is disconnected.
Figure 1. Rise and Fall Times
V
OHD
V
OLD
90%
10%
90%
10%
t
FR
, t
LR
t
FF
, t
LF
Table 3a. Transmit Truth Table
(
OE
= 0, SUS = 0)
INPUTS
VP
0
0
1
1
OUTPUTS
D-
0
1
0
1
VM
0
1
0
1
D+
0
0
1
1
RCV
X
0
1
X
OUTPUT STATE
SE0
Logic 0
Logic 1
Undefined
X
= Undefined.
Table 3b. Transmit Truth Table
(
OE
= 0, SUS = 1)
INPUTS
VP
0
0
1
1
OUTPUTS
D-
0
1
0
1
VM
0
1
0
1
D+
0
0
1
1
RCV
0
0
0
0
OUTPUT STATE
SE0
Logic 0
Logic 1
Undefined
Table 4a. Receive Truth Table
(
OE
= 1 and SUS = 0)
INPUTS
D+
0
0
1
1
OUTPUTS
VM
0
1
0
1
D-
0
1
0
1
VP
0
0
1
1
RCV
X
0
1
X
OUTPUT STATE
SE0
Logic 0
Logic 1
Undefined
X
= Undefined.
Table 4b. Receive Truth Table
(
OE
= 1 and SUS = 1)
INPUTS
D+
0
0
1
1
OUTPUTS
VM
0
1
0
1
D-
0
1
0
1
VP
0
0
1
1
RCV
0
0
0
0
OUTPUT STATE
SE0
Logic 0
Logic 1
Undefined
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