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參數(shù)資料
| 型號： | MIC2551AYTS TR |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 10/11頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC USB TRANSCEIVER 14-TSSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | USB 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 1/1 |
| 規(guī)程： | USB 2.0 |
| 電源電壓： | 4 V ~ 5.25 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 14-TSSOP |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | MIC2551AYTSTR MIC2551AYTSTR-ND |
MIC2551A
Micrel, Inc.
M9999-112008
8
November 2008
Power Supply Configuration
The MIC2551A can be set up for different power supply
configurations which modify the behavior of the device. Both
V
BUS and VIF have special thresholds that detect when they
are either removed or grounded. Table 3 depicts the behavior
under the different power supply configuration scenarios that
are explained below.
Normal Mode
V
BUS is connected to the 5.0V USB bus voltage and VIF is
connected to a supply voltage in the range of 1.6V to 3.6V. In
this case V
TRM supplies a 3.3V voltage for powering the
speed select resistor via V
PU depending on the state of CON
pin.
Disconnect Mode
V
IF is connected to a supply in a range of 1.6V to 3.6V and
V
BUS is open or grounded. If VBUS is opened while transmit-
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
BUS
ground, D+, D– sharing mode is not permitted.
Disable Mode
V
BUS is connected to the 5.0V USB bus voltage and VIF is
open. All logic controlled inputs become high impedances,
thus minimal current will be supplied by V
IF if the input pins are
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
TRM must
not exceed 10mA.
MIC2551
VIF
VBUS
I/O
VBUS
VP/VM/
RCV/OE#
VTRM
USB
Controller
VDD
3.3V
Figure 7. I/O Interface Using 3.3V
Signal Amplitude Respective to V
IF
When operating the MIC2551A, it is necessary to provide
input signals which do not exceed V
IF + 0.3V.
Suspend
When the suspend pin (SUS) is high, power consumption is
reduced to a minimum. V
TRM is not disabled. RCV, VP and VM
are still functional to enable the device to detect USB activity.
For minimal current consumption in suspend mode, it is
recommended that OE# = 1, and SPD = 0.
Speed
The speed pin (SPD) sets D+/D– output edge rates by increas-
ing or decreasing biasing current sources within the output
drivers. For low speed, SPD = 0. For full speed, SPD = 1. By
setting SPD = 0 during idle periods, in conjunction with suspend
(SUS), the lowest quiescent current can be obtained. However,
designers must provide a 300ns delay between changing SPD
from 0 to 1 and transmission of data at full speed. This delay
ensures the output drivers have arrived at their proper operating
conditions. Failure to do so can result in leading edge distortion
on the first few data bits transmitted.
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)
41206ESDA SurgX
0805ESDA SurgX
Littelfuse (www.littelfuse.com)
V0402MHS05
SP0503BAHT
Non-Multiplexed Bus
In order to save pin count for the USB logic controller
interface, the MIC2551A was designed with V
P and VM as bi-
directional pins. To interface the MIC2551A with a non-
multiplexed data bus, resistors can be used for low cost
isolation as shown in Figure 8.
VPO
VP
VM
VMO
USB Logic
Controller
(SIE)
MIC2551
VP
VM
10k
Figure 8. MIC2551A Interface to
Non-Multiplexed Data Bus
Configuration Mode
VBUS/VTRM
VIF
Notes
Normal
Connected
Normal supply configuration and operation.
Disconnect
Open
Connected
VP/VM are HIGH outputs, RCV is LOW.
(D+/D– sharing)
With OE# = 0 and SUS = 1, data lines may be driven with
external devices up to 3.6V.
With D+, D– floating, I
IF draws less than 1A.
Disconnect
Ground
Connected
VP/VM are HIGH outputs, RCV is LOW.
With D+, D– floating, I
IF draws less than 1A.
Disable Mode
Connected
Open
Logic controlled inputs pins are Hi-Z.
Prohibited
Connected
Ground
Prohibited condition.
Table 3. Power Supply Configuration
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