MIC2551BTS Micrel Inc, MIC2551BTS Datasheet - Page 8

• Manufacturer Part Number: MIC2551BTS
• Manufacturer: Micrel Inc

Specifications of MIC2551BTS

• Number Of Transceivers: 1
• Esd Protection: YeskV
• Operating Supply Voltage (typ): Not RequiredV
• Package Type: TSSOP
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (max): Not RequiredV
• Operating Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (typ): 1.8/2.5/3.3/5V
• Pin Count: 14
• Mounting: Surface Mount
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Lead Free Status / RoHS Status: Not Compliant

MIC2551
Application Information
Power Supply Configuration
The MIC2551 can be set up for different power supply
configurations which modify the behavior of the device. Both
V
are either removed or grounded. Table 3 depicts the behavior
under the different power supply configuration scenarios that
are explained below.
Normal Mode
V
connected to a supply voltage in the range of 1.6V to 3.6V. In
this case V
speed select resistor via V
CON pin.
Disconnect Mode
V
V
ting, the data lines (D+, D–) have sharing capability and may
be driven with external devices up to approximately 3.6V if,
and only if, SUSPEND is enabled (SUS = 1). With V
ground, D+, D– sharing mode is not permitted.
Disable Mode
V
open. All logic controlled inputs become high impedances,
thus minimal current will be supplied by V
pulled up to an external source.
Alternate Power Supply Configuration Options
I/O Interface Using 3.3V
In systems where the I/O interface utilizes a 3.3V USB
controller, an alternate solution is shown in Figure 7. No extra
components are required; however, the load on V
not exceed 10mA.
Configuration Mode
Normal
Disconnect
(D+/D– sharing)
Disconnect
Disable Mode
Prohibited
M9999-112008
BUS
BUS
IF
BUS
BUS
is connected to a supply in a range of 1.6V to 3.6V and
is open or grounded. If V
and V
is connected to the 5.0V USB bus voltage and V
is connected to the 5.0V USB bus voltage and V
3.3V
Controller
IF
TRM
Figure 7. I/O Interface Uses 3.3V
V
USB
DD
have special thresholds that detect when they
supplies a 3.3V voltage for powering the
I/O
PU
VBUS/VTRM
VIF
V
RCV/OE#
Connected
Connected
Connected
P
/V
depending on the state of the
BUS
Ground
Open
MIC2551
M
/
is opened while transmit-
VTRM
VBUS
IF
if the input pins are
Table 3. Power Supply Configuration
Connected
Connected
Connected
Ground
Open
VBUS
VIF
TRM
must
IF
IF
BUS
is
is
8
Normal supply configuration and operation.
VP/VM are HIGH outputs, RCV is LOW.
With OE# = 0 and SUS = 1, data lines may be driven with
external devices up to 3.6V.
With D+, D– floating, I
VP/VM are HIGH outputs, RCV is LOW.
With D+, D– floating, I
Logic controlled inputs pins are Hi-Z.
Prohibited condition.
Signal Amplitude Respective to V
When operating the MIC2551, it is necessary to provide input
signals which do not exceed V
External ESD Protection
The use of ESD transient protection devices is not required
for operation, but is recommended. We recommend the
following devices or the equivalent:
Cooper Electronic Technologies ( www.cooperet.com )
Littelfuse ( www.littelfuse.com )
Non-Multiplexed Bus
In order to save pin count for the USB logic controller
interface, the MIC2551 was designed with V
directional pins. To interface the MIC2551 with a non-multi-
plexed data bus, resistors can be used for low cost isolation
as shown in Figure 8.
41206ESDA SurgX
0805ESDA SurgX
V0402MHS05
SP0503BAHT
Figure 8. MIC2551 Interface to
Non-Multiplexed Data Bus
USB Logic
Controller
(SIE)
IF
IF

draws less than 1µA.
draws less than 1µA.

V
V
V
V
MO
PO
M
P
Notes
10k
10k
IF
+ 0.3V.
V
V
P
M
MIC2551
IF
November 2008
P
and V
Micrel, Inc.
M
as bi-