MAX3346E Просмотр технического описания (PDF) - Maxim Integrated
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MAX3346E Datasheet PDF : 17 Pages
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±15kV ESD-Protected USB Transceiver
in UCSP
VL
OE
VL/2
0V
tPVZ
VP/VM
VOH - 0.3V
VOL + 0.3V
Figure 1a. Enable and Disable Timing, Receiver
VL
VPO
0V
tPZV
VTRM
Timing Diagrams
VL/2
tPHLO
tPLHO
D+
0V
D-
Figure 2. Mode 0 Timing
VL
VL
VP
OE
VL/2
VL/2
0V
tPZD
0V
tPDZ
VL
tPHL1
tPLH1
D+/D-
VOHD - 0.3V
VOLD + 0.3V
Figure 1b. Enable and Disable Timing, Transmitter
VL/2
0V
VTRM
VL/2
tPLH1
VM
tPHL1
D+
SUSP
SUSP, or suspend, is a control input. When SUSP is
forced high the MAX3346E enters a low-power state. In
this state, the quiescent supply current into VCC is less
than 40µA. In this mode, RCV is forced low, and D+ and
D- are high-impedance inputs (Table 3d).
In suspend mode, data can only be transmitted with
full-speed slope control.
SPEED
SPEED is a control input that selects between low-speed
(1.5Mbps) and full-speed (12Mbps) USB transmission.
Internally, it selects whether the 1.5kΩ pullup resistor is
connected to D+ (full-speed) or D- (low-speed)
(Functional Diagram). Force SPEED high to select full
speed, or force SPEED low to select low speed.
VTRM
VTRM is the 3.3V output of the internal linear voltage
regulator. The regulator is used to power the internal
portions of the USB side of the MAX3346E. The VTRM
0V
D-
Figure 3. Mode 1 Timing
regulator’s supply input is VCC. Connect a 1.0µF (or
greater) ceramic or plastic capacitor from VTRM to
GND, as close to VTRM as possible. Do not use VTRM
to provide power to external circuitry.
D+ and D-
D+ and D- are the transceiver I/O connections, and are
ESD protected to ±15kV using the Human Body Model,
making the MAX3346E ideal for applications where a
robust transmitter is required.
VCC
Bypass VCC to GND with a 1µF capacitor. Place the
1µF capacitor as close as possible to the MAX3346E.
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