MIC2551A Micrel MIC2551A USB Transceiver General Description Features 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. • 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 MLF™ packages • No power supply sequencing requirements • Software controlled re-enumeration Applications • PDAs • Palmtops • Cell phones Ordering Information Part Number Package MIC2551ABTS 14-Pin TSSOP MIC2551ABML 16-Pin MLF™ Typical Application System Supply Voltage MIC2551A VCC GPIO USB SIE Controller VIF VTRM CON OE# RCV VP VBUS VM SPD SUS D– VBUS VPU RS 20Ω/±1% 1.5k D+ GND RS 20Ω/±1% 1.0µF (min) 10µF (max) D+ D– GND USB Port 1µF 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 May 2004 1 M9999-051004 MIC2551A Micrel VIF 1 NC VIF VBUS VPU Pin Configuration 14 VBUS SPD 2 13 VPU RCV 3 16 15 14 13 12 VTRM VP 4 11 D+ 1 12 VTRM RCV 2 11 VP VM 3 4 10 9 D+ D— OE# 10 D- CON 6 9 OE# GND 7 8 SUS 5 6 7 8 CON GND SUS NC VM 5 SPD 14-Pin TSSOP 16-Pin MLF™ (ML) Pin Description Pin Number Pin Number MIC2551ABTS MIC2551ABML Pin Name I/O Pin Function 1 15 VIF I System Interface Supply Voltage: Used to provide reference supply voltage for system I/O interface signaling. 2 1 SPD I Edge Rate Control: A logic HIGH operates at edge rates for “full speed” operation. A logic LOW operates edge rates for “low speed” operation. 3 2 RCV* O Receive Data: Output for USB differential data. 4 3 VP* I/O If OE# = 1, VP = Receiver output (+) If OE# = 0, VP = Driver input (+) 5 4 VM* I/O If OE# = 1 VM, = Receiver output (-) If OE# = 0, VM = Driver input (-) 6 5 CON I 7 6 GND 8 7 SUS I Suspend: Active-High. Turns off internal circuits to reduce supply current. 9 9 OE#* I Output Enable: Active-Low. Enables the transceiver to transmit data onto the bus. When inactive, the transceiver is in the receive mode. 10/11 10/11 D–, D+* I/O Differential data lines conforming to the USB standard. 12 12 VTRM O 3.3V Reference Supply Output: Requires a minimum 0.1µF decoupling capacitor for stability. A 1µF capacitor is recommended 13 13 VPU O Pull-up Supply Voltage Output: Used to connect 1.5kΩ pull-up speed detect resistor. If CON = 1, VPU is high impedance. If CON = 0, VPU = 3.3V. 14 14 VBUS I USB Bus Supply Voltage: Used to power USB transceiver and internal circuitry. 8,16 NC CONNECT (Input): Controls state of VPU. Refer to VPU pin description for detail. Ground Reference. No connect. * See Table 1 for description of logic states. M9999-051004 2 May 2004 MIC2551A Micrel SUS OE# D+, D– RCV VP/VM Function 0 0 Driving Active Active Normal transmit mode. 0 1 Receiving Active Active Normal receive mode. 1 0 Hi-Z 0 Not active 1 1 Hi-Z 0 Active 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 Output Result VP VM D+ D- RCV 0 0 0 0 X SE0 0 1 0 1 0 Logic 0 1 0 1 0 1 Logic 1 1 1 1 1 X Undefined OE# = 1: Input Output Result D+ D- VP VM RCV 0 0 0 0 X SE0 0 1 0 1 0 Logic 0 1 0 1 0 1 Logic 1 1 1 1 1 X Undefined X - Undefined Table 2. Truth Table During Normal Mode May 2004 3 M9999-051004 MIC2551A Micrel Absolute Maximum Ratings (Note 1) Operating Ratings (Note 2) Supply Voltage (VBUS) ................................................. 6.5V All Other Inputs ............................................. –0.5V to 5.5V Ambient Storage Temperature ................. –65°C to +150°C Output Current (D+, D–) .......................................... ± 50mA Output Current (all others) ....................................... ±15mA Input Current ............................................................ ±50mA ESD, Note 3 VBUS, D+, D– ........................................................ ±11KV All other pins .......................................................... ±2KV Supply Voltage (VBUS) ................................. 4.0V to 5.25V Ambient Operating Temperature ................ –40°C to +85°C Package Thermal Resistance TSSOP (θJA) .................................................. 100(°C/W) MLF (θJA) ......................................................... 59(°C/W) DC Electrical Characteristics (System and USB Interface) (Note 7) VIF = 3.6V, VBUS = 5V unless otherwise noted; TA = 25°C. bold indicates specifications over temperature, –40°C to 85°C. Symbol Parameter VBUS USB Supply Voltage VIF System I/F Supply Voltage VIL Max Units 4.0 5.25 V 1.6 3.6 V LOW-Level Input Voltage, Note 4 VIF – 0.3 0.15VIF V VIH HIGH-Level Input Voltage, Note 4 0.85VIF VIF + 0.3 V VOH HIGH-Level Output Voltage, Note 4 IOH = 20µA VOL LOW-Level Output Voltage, Note 4 IOL = 20µA IIL Input Leakage Current, Note 4 IIF VIF Supply Current IBUS VBUS Supply Current Conditions Min Typ 0.9VIF V 0.1 V 5 µA D+, D– are idle, OE# = SUS = 0 5 µA D+, D– are idle, OE# = 0, SUS = 1 5 µA –5 D+, D– active, CLOAD = 50pF, SPD = 1, f = 6MHz, Note 5 450 650 µA D+, D– active, CLOAD = 600pF SPD = 0, f = 750kHz, Note 5 50 75 µA VBUS = 5.25V, D+, D– are idle SUS = 0, OE# = 1, SPD = 1 200 500 µA VBUS = 5.25V, D+, D– are idle, SPD = 1 SUS = OE# = 0 3.3 5 mA VBUS = 5.25V, D+, D– are idle SUS = OE# = SPD = 0 500 700 µA VBUS = 5.25V, D+, D– are idle, OE# = 1 SUS = SPD = 0 250 350 µA VBUS = 5.25V, D+, D– active, CLOAD = 50pF, SPD = 1 SUS = OE# = 0, f = 6MHz, Note 5 7.3 10 mA VBUS = 5.25V, D+, D– active, CLOAD = 600pF SPD = SUS = OE# = 0, f = 750kHz, Note 5 3.6 5 mA IVPULEAK VPU Leakage Current CON = 1, VPU = 0V –5 5 µA IVIFLEAK VIF Leakage Current VIF = 3.6V, VBUS = 0V –5 5 µA VPU Pull-Up Output Voltage ITERM = 200µA, VBUS = 4.0 to 5.25V 3.0 3.6 V RSW Internal Pull-Up Termination Switch ITERM = 10mA, VBUS = 4.0 to 5.25V 10 Ω IEC-1000-4-2 Air Discharge 10 pulses ±8 kV (D+, D–, VBUS only) 10 pulses ±9 kV 3.3 ESD Protection M9999-051004 Contact Discharge 4 May 2004 MIC2551A Micrel DC Electrical Characteristics (Transceiver) (Note 7) Symbol Parameter Conditions Min Typ Max Units Hi-Z State Data Line Leakage (Suspend Mode) 0V < VIN < 3.3V, SUS = 1 –10 10 µA VDI Differential Input Sensitivity |(D+) – (D–)| 0.2 VCM Differential Common Mode Range Includes VDI range 0.8 2.5 V VSE Single-Ended Receiver Threshold 0.8 2.0 V Leakage Current ILO Input Levels Receiver Hysteresis V 200 mV Output Levels VOL Static Output Low RL = 1.5kΩ to 3.6V VOH Static Output High RL = 15kΩ to GND CIN Transceiver Capacitance Pin to GND ZDRV Driver Output Resistance Steady state drive 2.8 0.3 V 3.6 V Capacitance 10 8 16 pF 24 Ω AC Electrical Characteristics (Notes 6, 7) Driver Characteristics (Low Speed) TR Transition Rise Time Transition Fall Time TF TR, TF Rise/Fall Time Matching VCRS Output Signal Crossover Voltage CL = 50pF, Figure 2 CL = 600pF 75 ns CL = 50pF, Figure 2 CL = 600pF 75 (TR, TF) 80 125 % 1.3 2.0 V 300 ns 300 Driver Characteristics (Full Speed) TR Transition Rise Time CL = 50pF, Figure 2 4 20 ns TF Transition Fall Time CL = 50pF, Figure 2 4 20 ns TR, TF Rise/Fall Time Matching (TR, TF) 90 111.11 % VCRS Output Signal Crossover Voltage 1.3 2.0 V 15 ns Transceiver Timing tPVZ OE# to RCVR Tri-State Delay Figure 1 tPZD Receiver Tri-State to Transmit Delay Figure 1 tPDZ OE# to DRVR Tri-State Delay Figure 1 tPZV Driver Tri-State to Receive Delay Figure 1 tPLH tPHL VP, VM to D+, D– Propagation Delay Figure 4 15 ns tPLH tPHL D+, D– to RCV Propagation Delay Figure 3 15 ns tPLH tPHL D+, D– to VP, VM Propagation Delay Figure 3 8 ns 15 15 15 Note 1. Exceeding the absolute maximum rating may damage the device. Note 2. The device is not guaranteed to function outside its operating rating. Note 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. Note 4. Specification applies to the following pins: SUS, SPD, RCV, CON, RCV, VP, VM, OE#. Note 5. Characterized specification(s), but not production tested. Note 6. All AC parameters guaranteed by design but not production tested. Note 7. Specification for packaged product only. May 2004 ns 5 ns ns M9999-051004 MIC2551A Micrel Timing Diagrams RECEIVE TRANSMIT OE# tPVZ tPZV VP/VM tPZD tPDZ D+/D– Figure 1. Enable and Disable Times Rise Time Differential Data Lines Fall Time 90% 90% 10% 10% tR tF Figure 2. Rise and Fall Times D+ Differential Data Lines VCRS D– VCRS tPHL tPLH VOH VOL VSS Figure 3. Receiver Propagation Delay VOH VOL D+ tPLH tPHL Differential Data Lines VCRS D– 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. 20Ω 15k CL Figure 6. Load for D+, D– M9999-051004 6 May 2004 MIC2551A Micrel Functional Diagram To Internal Circuitry LDO Regulator VBUS VIF VTERM VPU CON D+ SPD OE# D– Level Translator RCV 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. May 2004 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. 7 M9999-051004 MIC2551A Micrel 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. 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 Normal Mode 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. 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. 3.3V MIC2551A VDD VIF VBUS VBUS USB Controller I/O VP/VM/ VTRM RCV/OE# USB Logic Controller (SIE) Figure 7. I/O Interface Using 3.3V Bypass Input MIC2551A VP 10k 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. VPO VM VBUS VM 10k MIC2551A VIF VP VMO 3.3V Figure 9. MIC2551A Interface to Non-Multiplexed Data Bus VTRM Figure 8. Powering MIC2551A from External 3.3V M9999-051004 8 May 2004 MIC2551A Configuration Mode Micrel VBUS/VTRM VIF Connected Connected Normal supply configuration and operation. Open Connected 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 1µA. Ground Connected VP/VM are HIGH outputs, RCV is LOW. With D+, D– floating, IIF draws less than 1µA. Disable Mode Connected Open Prohibited Connected Ground Normal Disconnect (D+/D– sharing) Disconnect Notes Logic controlled inputs pins are Hi-Z. Prohibited condition. 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–. May 2004 9 M9999-051004 MIC2551A 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) 0.20 (0.008) 0.09 (0.003) 1.10 MAX (0.043) 0.65 BSC (0.026) 1.00 (0.039) REF 8° 0° 0.15 (0.006) 0.05 (0.002) 0.70 (0.028) 0.50 (0.020) 14-lead TSSOP (TS) 0.42 +0.18 –0.18 0.23 +0.07 –0.05 0.85 +0.15 –0.65 0.01 +0.04 –0.01 3.00BSC 1.60 +0.10 –0.10 0.65 +0.15 –0.65 0.20 REF. 2.75BSC 0.42 PIN 1 ID +0.18 –0.18 N 16 1 1 0.50 DIA 2 2 2.75BSC 3.00BSC 3 3 1.60 +0.10 –0.10 4 4 12° max 0.42 +0.18 –0.18 SEATING PLANE CC 0.23 +0.07 –0.05 4 0.5BSC 0.40 +0.05 –0.05 1.5 REF BOTTOM VIEW TOP VIEW CL 0.5 BSC SECTION "C-C" SCALE: NONE 0.01 +0.04 –0.01 1. 2. 3. 4. 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 FOR EVEN TERMINAL/SIDE Rev. 02 16-Pin MLF™ (ML) M9999-051004 10 May 2004 MIC2551A Micrel 16-Pin MLF™ (ML) MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB USA 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. © 2004 Micrel, Incorporated. May 2004 11 M9999-051004