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MIC2551
Micrel
MIC2551
USB Transceiver Final Information
General Description
The MIC2551 is a single chip transceiver that complies with the physical layer specifications of the Universal Serial Bus (USB) 2.0. It supports both full speed (12Mbps) and low speed (1.5Mbps) operation. It is also designed to operate down to 1.6V in order to be compatible with lower system voltages of most mobile systems.
Features
* Compliant to USB Specification Revision 2.0 for full speed (12Mbs) and low speed (1.5Mbps) operation * Compliant to IEC-61000-4.2 (Level 3) * Separate I/O supply with operation down to 1.6V * Integrated speed select termination supply * Very-low power consumption to meet USB suspendcurrent requirements * Small TSSOP and MLFTM packages * No power supply sequencing requirements * Software controlled re-enumeration
Applications
* PDAs * Palmtops * Cell phones
Ordering Information
Part Number MIC2551BTS MIC2551BML Package 14-Pin TSSOP 16-Pin MLFTM
Typical Application
System Supply Voltage VCC GPIO
MIC2551 VIF CON OE# RCV VP VM SPD SUS GND VTRM VBUS VPU
VBUS RS 20/1%
USB SIE Controller
1.5k
D+ D-
RS 20/1%
1.0F (min) 10F (max) 1F
D+ D- GND
USB Port
41206ESDA SurgX (See "Applications Information" for additional suppliers.)
Typical Application Circuit
MicroLeadFrame and MLF are trademarks of Amkor Technology. SurgX is a registered trademark of Cooper Electronics Technologies.
Micrel, Inc. * 1849 Fortune Drive * San Jose, CA 95131 * USA * tel + 1 (408) 944-0800 * fax + 1 (408) 944-0970 * http://www.micrel.com
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MIC2551
MIC2551
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Pin Configuration
VIF 1 SPD 2 RCV 3 VP 4 VM 5 CON 6 GND 7
14 VBUS 13 VPU 12 VTRM 11 D+ 10 D9 OE# 8 SUS
SPD RCV VP VM 1 2 3 4 5678 CON GND SUS NC NC VIF VBUS VPU 16 15 14 13 12 11 10 9 VTRM D+ D-- OE#
14-Pin TSSOP
16-Pin MLFTM (ML)
Pin Description
Pin Number MIC2551BTS 1 2 Pin Number MIC2551BML 15 1 Pin Name VIF SPD I/O I I Pin Function System Interface Supply Voltage: Used to provide reference supply voltage for system I/O interface signaling. Edge Rate Control: A logic HIGH operates at edge rates for "full speed" operation. A logic LOW operates edge rates for "low speed" operation. Receive Data: Output for USB differential data. If OE# = 1, VP = Receiver output (+) If OE# = 0, VP = Driver input (+) If OE# = 1 VM, = Receiver output (-) If OE# = 0, VM = Driver input (-) CONNECT (Input): Controls state of VPU. Refer to VPU pin description for detail. Ground Reference. I I Suspend: Active-High. Turns off internal circuits to reduce supply current. Output Enable: Active-Low. Enables the transceiver to transmit data onto the bus. When not active, the transceiver is in the receive mode. Differential data lines conforming to the USB standard. 3.3V Reference Supply Output: Requires a minimum 0.1F decoupling capacitor for stability, 1F recommended.4 Pull-up Supply Voltage Output: Used to connect 1.5k pull-up speed detect resistor. If CON = 1, VPU is high impedance. If CON = 0, VPU = 3.3V. USB Bus Supply Voltage: Used to power USB transceiver and internal circuitry. No connect.
3 4 5 6 7 8 9
2 3 4 5 6 7 9
RCV* VP* VM* CON GND SUS OE#*
O I/O I/O I
10/11 12 13
10/11 12 13
D-, D+* VTRM VPU
I/O O O
14
14 8,16
VBUS NC
I
* See Table 1 for description of logic states.
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SUS 0 0 1 1 OE# 0 1 0 1 D+, D- Driving Receiving Hi-Z Hi-Z RCV Active Active 0 0 VP/VM Active Active Not active Active Function Normal transmit mode Normal receive mode Low power state
Micrel
Receiving during suspend (low power state) (Note 1)
Note 1. During suspend VP and VM are active in order to detect out of band signaling conditions.
Table 1. Function Selection
OE# = 0: Input VP 0 0 1 1 OE# = 1: Input D+ 0 0 1 1
X - Undefined
Output VM 0 1 0 1 D+ 0 0 1 1 D0 1 0 1 RCV X 0 1 X Result SE0 Logic 0 Logic 1 Undefined
Output D0 1 0 1 VP 0 0 1 1 VM 0 1 0 1 RCV X 0 1 X Result SE0 Logic 0 Logic 1 Undefined
Table 2. Truth Table During Normal Mode
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Absolute Maximum Ratings (Note 1)
Supply Voltage (VBUS) ................................................. 6.5V All Other Inputs ............................................. -0.5V to 5.5V Ambient Storage Temperature ................. -65C to +150C Output Current (D+, D-) .......................................... 50mA Output Current (all others) ....................................... 15mA Input Current ............................................................ 50mA ESD, Note 3 VBUS, D+, D- ........................................................ 11KV All other pins .......................................................... 2KV
Operating Ratings (Note 2)
Ambient Operating Temperature ................ -40C to +85C Package Thermal Resistance TSSOP (JA) ..................................................... 100C/W MLF (JA) ............................................................ 59C/W
DC Electrical Characteristics (System and USB Interface) (Note 7)
VIF = 3.6V, VBUS = 5V unless otherwise noted; TA = 25C. Bold indicates specifications over temperature, -40C to 85C. Symbol VBUS VIF VIL VIH VOH VOL IIL IIF Parameter USB Supply Voltage System I/F Supply Voltage LOW-Level Input Voltage, Note 4 HIGH-Level Input Voltage, Note 4 HIGH-Level Output Voltage, Note 4 LOW-Level Output Voltage, Note 4 Input Leakage Current, Note 4 VIF Supply Current D+, D- are idle, OE# = SUS = 0 D+, D- are idle, OE# = 0, SUS = 1 D+, D- active, CLOAD = 50pF, SPD = 1, f = 6MHz, Note 5 D+, D- active, CLOAD = 600pF SPD = 0, f = 750kHz, Note 5 IBUS VBUS Supply Current VBUS = 5.25V, D+, D- are idle Suspend Mode (SUS = 1) VBUS = 5.25V, D+, D- are idle, SPD = 1 SUS = OE# = 0 VBUS = 5.25V, D+, D- are idle SUS = OE# = SPD = 0 VBUS = 5.25V, D+, D- are idle, OE# = 1 SUS = SPD = 0 VBUS = 5.25V, D+, D- active, CLOAD = 50pF, SPD = 1 SUS = OE# = 0, f = 6MHz, Note 5 VBUS = 5.25V, D+, D- active, CLOAD = 600pF SPD = SUS = OE# = 0, f = 750kHz, Note 5 IVPULEAK IVIFLEAK VPU RSW VPU Leakage Current VIF Leakage Current Pull-Up Output Voltage Internal Pull-Up Termination CON = 1, VPU = 0V VIF = 3.6V, VBUS = 0V ITERM = 200A, VBUS = 4.0 to 5.25V ITERM = 10mA, VBUS = 4.0 to 5.25V 10 pulses 10 pulses -5 -5 3.0 3.3 10 8 9 450 50 65 3.3 500 250 7.3 IOH = 20A IOL = 20A -5 Conditions Min 4.0 1.6 VIF-0.3 0.85VIF 0.9VIF 0.1 5 5 5 650 75 100 5 700 350 10 Typ Max 5.25 3.6 0.15VIF VIF+0.3 Units V V V V V V A A A A A A mA A A mA
3.6
5 5 5 3.6
mA A A V
ESD Protection IEC-1000-4-2 Air Discharge (D+, D-, VBUS only) Contact Discharge kV kV
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DC Electrical Characteristics (Transceiver) (Note 7)
Symbol Parameter Conditions Min Typ Max Units A Leakage Current ILO Input Levels VDI VCM VSE Output Levels VOL VOH Capacitance CIN ZDRV Transceiver Capacitance Driver Output Resistance Pin to GND Steady state drive 8 10 16 24 pF Static Output Low Static Output High RL = 1.5k to 3.6V RL = 15k to GND 2.8 0.3 3.6 V V Differential Input Sensitivity Differential Common Mode Range Single Ended Receiver Threshold Receiver Hysteresis |(D+) - (D-)| Includes VDI range 0.2 0.8 0.8 200 2.5 2.0 V V V mV Hi-Z State Data Line Leakage (Suspend Mode) 0V < VIN < 3.3V, SUS = 1 -10 10
AC Electrical Characteristics (Notes 6, 7)
Driver Characteristics (Low Speed) TR TF TR, TF VCRS TR TF TR, TF VCRS tPVZ tPZD tPDZ tPZV tPLH tPHL tPLH tPHL tPLH tPHL
Note 1. Note 2. Note 3. Note 4. Note 5. Note 6. Note 7.
Transition Rise Time Transition Fall Time Rise/Fall Time Matching Output Signal Crossover Voltage
CL = 50pF, Figure 2 CL = 600pF CL = 50pF, Figure 2 CL = 600pF (TR, TF)
75 300 75 300 80 1.3 125 2.0
ns ns % V
Driver Characteristics (Full Speed) Transition Rise Time Transition Fall Time Rise/Fall Time Matching Output Signal Crossover Voltage CL = 50pF, Figure 2 CL = 50pF, Figure 2 (TR, TF) 4 4 90 1.3 20 20 111.11 2.0 ns ns % V
Transceiver Timing OE# to RCVR Tri-State Delay Receiver Tri-State to Transmit Delay OE# to DRVR Tri-State Delay Driver Tri-State to Receive Delay VP, VM to D+, D- Propagation Delay D+, D- to RCV Propagation Delay D+, D- to VP, VM Propagation Delay Figure 1 Figure 1 Figure 1 Figure 1 Figure 4 Figure 3 Figure 3 15 15 15 8 15 15 15 ns ns ns ns ns ns ns
Exceeding the absolute maximum rating may damage the device. The device is not guaranteed to function outside its operating rating. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. Specification applies to the following pins: SUS, SPD, RCV, CON, RCV, VP, VM, OE#. Characterized specification(s), but not production tested. All AC parameters guaranteed by design but not production tested. Specification for packaged product only.
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Timing Diagrams
TRANSMIT OE# tPVZ VP/VM tPZD D+/D- tPDZ tPZV RECEIVE
Figure 1. Enable and Disable Times
Rise Time Differential Data Lines
90% 10%
Fall Time
90% 10%
tR
tF
Figure 2. Rise and Fall Times
D+ VCRS D- VOH VOL VSS tPLH
Differential Data Lines
VCRS tPHL
Figure 3. Receiver Propagation Delay
VOH VOL D+ D- tPLH VCRS Differential Data Lines tPHL VCRS
Figure 4. Driver Propagation Delay
Test Circuits
D.U.T. 25pF
Figure 5. Load for VP, VM, RCV
VTRM 15k D.U.T. 20 15k CL
Figure 6. Load for D+, D- MIC2551 6 January 2003
MIC2551
Micrel
Functional Diagram
To Internal Circuitry
LDO Regulator VIF
VBUS VTERM VPU
CON D+ D-
SPD OE#
RCV
VP
VM
SUS GND
Level Translator
MIC2551 Block Diagram
Functional Description
The MIC2551 is designed to provide USB connectivity in mobile systems where available system supply voltages are not able to satisfy USB requirements. The MIC2551 can operate down to supply voltages of 1.6V and still meet USB physical layer specifications. As shown in the circuit above, the MIC2551 takes advantage of the USB supply voltage, VBUS, to operate the transceiver. The system voltage, VIF, is used to set the reference voltage used by the digital I/O lines interfacing to the system controller. Internal circuitry provides translation between the USB and system voltage domains. VIF will typically be the main supply voltage rail for the controller. January 2003 7 In addition, a 3.3V, 10% termination supply voltage, VPU, is provided to support speed selection. VPU can be disabled or enabled under software control via the CON input. This allows for software-controlled connect or disconnect states. A 1.5k resistor is required to be connected between this pin and the D+ or D- lines to respectively specify high speed or low speed operation. The use of ESD transient protection devices is not required for operation, but is recommended. The MIC2551 is ESD rated for 11kV at the VBUS and D+, D- pins and 2kV for all other pins.
MIC2551
MIC2551
Micrel
Bypass Input
Application Information
Power Supply Configuration The MIC2551 can be set up for different power supply configurations which modify the behavior of the device. Both VBUS 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
VBUS and VTRM are tied together to a supply voltage in the range of 3.0V to 3.6V. The internal regulator is bypassed and the internal circuitry is run from the VTRM input. See Figure 8.
MIC2551 VIF VBUS 3.3V
VTRM
VBUS 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 VTRM supplies a 3.3V voltage for powering the speed select resistor via VPU depending on the state of the CON pin.
Disconnect Mode
Figure 8. Powering Chip from Internal 3.3V Source Signal Amplitude Respective to VIF When operating the MIC2551, it is necessary to provide input signals which do not exceed VIF + 0.3V. 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 MIC2551 was designed with VP and VM as bidirectional pins. To interface the MIC2551 with a non-multiplexed data bus, resistors can be used for low cost isolation as shown in Figure 9.
USB Logic Controller (SIE) MIC2551 VP 10k VPO VM 10k VMO VM
VIF is connected to a supply in a range of 1.6V to 3.6V and VBUS is open or grounded. If VBUS is opened while transmitting, 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 VBUS ground, D+, D- sharing mode is not permitted.
Disable Mode
VBUS 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 VIF 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 VTRM must not exceed 10mA.
3.3V MIC2551 VDD USB Controller I/O VP/VM/ VTRM RCV/OE# VIF VBUS VBUS
VP
Figure 7. I/O Interface Uses 3.3V
Figure 9. MIC2551 Interface to Non-Multiplexed Data Bus
Configuration Mode Normal Disconnect (D+/D- sharing)
VBUS/VTRM Connected Open
VIF Connected Connected
Notes 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, IIF draws less than 1A. VP/VM are HIGH outputs, RCV is LOW. With D+, D- floating, IIF draws less than 1A. Logic controlled inputs pins are Hi-Z. Prohibited condition.
Disconnect Disable Mode Prohibited
Ground Connected Connected
Connected Open Ground
Table 3. Power Supply Configuration MIC2551 8 January 2003
MIC2551
Micrel
PCB Layout Recommendations
Although the USB standard and applications are not based in an impedance controlled environment, a properly designed PCB layout is recommended for optimal transceiver performance. The suggested PCB layout hints are as follows: * Match signal line traces (VP/VM, D+, D-) to 40ps, approximately 1/3 inch if possible. FR-4 PCB material propagation is about 150ps/inch, so to minimize skew try to keep VP/VM, D+/D- traces as short as possible. * For every signal line trace width (w), separate the signal lines by 1.5-2 widths. Place all other traces at >2 widths from all signal line traces. * Maintain the same number of vias on each differential trace, keeping traces approximately at same separation distance along the line. * Control signal line impedances to 10%. * Keep RS as close to the IC as possible, with equal distance between RS and the IC for both D+ and D-.
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MIC2551
MIC2551
Micrel
Package Information
4.50 (0.177) 6.4 BSC (0.252) 4.30 (0.169)
DIMENSIONS: MM (INCH)
0.30 (0.012) 0.19 (0.007) 5.10 (0.200) 4.90 (0.193) 1.10 MAX (0.043) 0.20 (0.008) 0.09 (0.003)
0.65 BSC (0.026)
0.15 (0.006) 0.05 (0.002)
8 0
1.00 (0.039) REF 0.70 (0.028) 0.50 (0.020)
14-lead TSSOP (TS)
0.85 +0.15 -0.65 3.00BSC 2.75BSC
16 1
0.42 +0.18 -0.18 0.23 +0.07 -0.05 0.01 +0.04 -0.01 1.60 +0.10 -0.10 0.42
+0.18 -0.18
0.65 +0.15 -0.65 0.20 REF.
N
PIN 1 ID
1
0.50 DIA
2 3 4
2.75BSC 3.00BSC
2 3 4
1.60 +0.10 -0.10
12 max SEATING PLANE TOP VIEW CC C L 4 0.23 +0.07 -0.05 0.01 +0.04 -0.01 1. 2. 3. 4.
0.42 +0.18 -0.18
0.5 BSC 1.5 REF BOTTOM VIEW
0.40 +0.05 -0.05
0.5BSC FOR EVEN TERMINAL/SIDE
SECTION "C-C" SCALE: NONE
DIMENSIONS ARE IN mm. DIE THICKNESS ALLOWABLE IS 0.305mm MAX. PACKAGE WARPAGE MAX 0.05mm. THIS DIMENSION APPLIES TO PLATED TERMINAL AND IS MEASURED BETWEEN 0.20mm AND 0.25mm FROM TIP. 5. APPLIES ONLY FOR TERMINALS
Rev. 02
16-Pin MLFTM (ML)
MICREL, INC. 1849 FORTUNE DRIVE
TEL
SAN JOSE, CA 95131
WEB
USA
+ 1 (408) 944-0800
FAX
+ 1 (408) 944-0970
http://www.micrel.com
This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel, Inc. (c) 2003 Micrel, Incorporated
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January 2003

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