MAX3345EEBE-T Maxim Integrated, MAX3345EEBE-T Datasheet - Page 9

• Manufacturer Part Number: MAX3345EEBE-T
• Description: USB Interface IC
• Manufacturer: Maxim Integrated

Specifications of MAX3345EEBE-T

• Product: USB 2.0
• Data Rate: 12 Mbps, 480 Mbps
• Interface Type: Differential Data Interface, Single End
• Operating Supply Voltage: 4 V to 5.5 V
• Operating Supply Current: 10 mA

Figure 2. Enable and Disable Timing, Transmitter
Figure 3. Mode 0 Timing
Figure 4. Mode 1 Timing
VTRM
VPO
D+/D-
0V
0V
V
V
0V
L
VTRM
V
L
OE
0V
V
0V
L
L
0V
V
L
/2
_______________________________________________________________________________________
t
PZD
±15kV ESD-Protected USB Transceivers
V
t
PHL1
t
t
PLH1
L
PHLO
/2
V
V
L
/2
L
/2
V
L
/2
t
V
V
PLHO
OHD
OLD
t
t
t
PLH1
PDZ
PLH1
+ 0.3V
- 0.3V
D+
D-
VPO
VMO
D+
D-
in UCSP with USB Detect
Data received from the USB are output to VPI/VMI in
either of two ways, differentially or single ended. To
receive data from the USB, force OE high and SUSP low.
Differential data arriving at D+/D- appear as differential
logic signals at VPI/VMI, and as a single-ended logic sig-
nal at RCV. If both D+ and D- are low, then VPI and VMI
are low, signaling a single-ended zero condition on the
bus; RCV remains in the last known state (Table 3).
The MAX3344E/MAX3345E output data to the USB dif-
ferentially on D+ and D-. The logic driving signals can
be either differential or single ended. For sending differ-
ential logic, force MODE high, force OE and SUSP low,
and apply data to VPO and VMO. D+ then follows VPO,
and D- follows VMO. To send single-ended logic sig-
nals, force MODE, SUSP, and OE low, and apply data to
VPO/VMO.
To protect the MAX3344E/MAX3345E against ESD, D+
and D- have extra protection against static electricity to
protect the device up to ±15kV. The ESD structures
withstand high ESD in all states — normal operation,
suspend, and powered down. For the 15kV ESD struc-
tures to work correctly, a 1µF or greater capacitor must
be connected from VTRM to GND.
ESD protection can be tested in various ways; the D+
and D- input/output pins are characterized for protection
to the following limits:
1) ±15kV using the Human Body Model
3) ±10kV using the IEC 1000-4-2 Air-Gap Method
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents test
setup, test methodology, and test results.
Figure 1a shows the Human Body Model, and Figure 1b
shows the current waveform it generates when dis-
charged into a low impedance. This model consists of a
100pF capacitor charged to the ESD voltage of interest,
which is then discharged into the test device through a
1.5kΩ resistor.
2) ±8kV using the IEC 1000-4-2 Contact Discharge
Method
Transmitting Data to the USB
Receiving Data from the USB
ESD Protection
ESD Test Conditions
Human Body Model
Data Transfer
9