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MIC2551A
Micrel
MIC2551A
USB Transceiver
General Description
The MIC2551A 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 and introduces superior edge rate control, producing crisper eye diagrams, which ease the task of passing USB compliance testing. A unique, patented, dual supply voltage operation allows the MIC2551A to reference the system I/F I/O signals to a supply voltage down to 1.6V while independently powered by the USB VBUS. This allows the system interface to operate at its core voltage without addition of buffering logic and also reduce system operating current.
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 MIC2551ABTS MIC2551ABML Package 14-Pin TSSOP 16-Pin MLFTM
Typical Application
System Supply Voltage VCC GPIO
MIC2551A 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) 474-1000 * http://www.micrel.com
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Pin Configuration
NC VIF VBUS VPU 16 15 14 13 SPD RCV VP VM 1 2 3 4 5678 CON GND SUS NC 12 11 10 9 VTRM D+ D-- OE#
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
14-Pin TSSOP
16-Pin MLFTM (ML)
Pin Description
Pin Number Pin Number MIC2551ABTS MIC2551ABML 1 2 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 inactive, 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. A 1F capacitor is recommended 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
10/11 12
D-, D+* VTRM
I/O O
13
13
VPU
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. 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)
Supply Voltage (VBUS) ................................. 4.0V to 5.25V Ambient Operating Temperature ................ -40C to +85C Package Thermal Resistance TSSOP (JA) .................................................. 100(C/W) MLF (JA) ......................................................... 59(C/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 SUS = 0, OE# = 1, SPD = 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 Switch 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 50 200 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 75 500 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)
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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 1.5k D.U.T. 20 15k CL
Figure 6. Load for D+, D-
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Functional Diagram
To Internal Circuitry
LDO Regulator
VBUS VTERM VPU
VIF
CON SPD OE#
D+ D-
RCV
Level Translator
VP
VM
SUS
GND
MIC2551A
Applications Information
The MIC2551A is designed to provide USB connectivity in mobile systems where available system supply voltages are not able to satisfy USB requirements. The MIC2551A can operate down to supply voltages of 1.6V and still meet USB physical layer specifications. As shown in the circuit above, the MIC2551A 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. 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 MIC2551A is ESD rated for 11kV at the VBUS and D+, D- pins and 2kV for all other pins.
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Power Supply Configuration The MIC2551A 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
Micrel
Signal Amplitude Respective to VIF When operating the MIC2551A, it is necessary to provide input signals which do not exceed VIF + 0.3V. Suspend When the suspend pin (SUS) is high, power consumption is reduced to a minimum. VTRM 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 increasing 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 VP and VM as bidirectional pins. To interface the MIC2551A with a nonmultiplexed data bus, resistors can be used for low cost isolation as shown in Figure 9.
USB Logic Controller (SIE) VP 10k VPO VM 10k VMO VM MIC2551A VP
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 CON pin.
Disconnect Mode
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 MIC2551A VDD USB Controller I/O VP/VM/ VTRM RCV/OE# VIF VBUS VBUS
Figure 7. I/O Interface Using 3.3V
Bypass Input
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.
MIC2551A VIF VBUS 3.3V
Figure 9. MIC2551A Interface to Non-Multiplexed Data Bus
VTRM
Figure 8. Powering MIC2551A from External 3.3V
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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.
Micrel
Disconnect Disable Mode Prohibited
Ground Connected Connected
Connected Open Ground
Table 3. Power Supply Configuration
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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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)
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16-Pin MLFTM (ML)
MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131
TEL
USA
+ 1 (408) 944-0800
FAX
+ 1 (408) 474-1000
WEB
http://www.micrel.com
The information furnished by Micrel in this datasheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2004 Micrel, Incorporated.
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