MIC2551A Micrel, Inc. MIC2551A USB Transceiver General Description Features The MIC2551A is a single chip transceiver that complies with Compliant to USB Specification Revision 2.0 for full the physical layer specifications of the Universal Serial Bus speed (12Mbs) and low speed (1.5Mbps) operation (USB) 2.0. It supports both full speed (12Mbps) and low Compliant to IEC-61000-4.2 (Level 3) speed (1.5Mbps) operation and introduces superior edge Separate I/O supply with operation down to 1.6V rate control, producing crisper eye diagrams, which ease the Integrated speed select termination supply task of passing USB compliance testing. Very-low power consumption to meet USB suspend- current requirements A unique, patented, dual supply voltage operation allows the Small TSSOP and MLF packages MIC2551A to reference the system I/F I/O signals to a supply No power supply sequencing requirements voltage down to 1.6V while independently powered by the Software controlled re-enumeration USB V . This allows the system interface to operate at its BUS core voltage without addition of buffering logic and also Applications reduce system operating current. PDAs Palmtops Cell phones Ordering Information Part Number Standard Pb-Free Package MIC2551ABTS MIC2551AYTS 14-Pin TSSOP MIC2551ABML MIC2551AYML 16-Pin MLF Typical Application System MIC2551A Supply Voltage VCC GPIO VIF VTRM V BUS VBUS CON OE VPU R S RCV 1.5k USB 20 /1% USB SIE D+ Port VP D+ Controller D VM D R GND S SPD 20 /1% SUS 1.0F (min) 1F GND 10F (max) 41206ESDA SurgX (See Applications Information for additional suppliers.) Typical Application Circuit MicroLeadFrame and MLF are registered trademarks of Amkor Technology. SurgX is a registered trademark of Cooper Electronics Technologies. Micrel, Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 MIC2551A Micrel, Inc. Pin Configuration VIF 1 14 VBUS SPD 2 13 VPU 16 15 14 13 1 12 SPD VTRM RCV 3 12 VTRM 2 11 RCV D+ VP 4 11 D+ VP 3 10 D VM 5 10 D- VM 4 9 OE 5678 CON 6 9 OE GND 7 8 SUS 14-Pin TSSOP 16-Pin MLF (ML) Pin Description Pin Number Pin Number Pin Name I/O Pin Function MIC2551ABTS MIC2551ABML 115 VIF I System Interface Supply Voltage: Used to provide reference supply voltage for system I/O interface signaling. 21 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. 32 RCV* O Receive Data: Output for USB differential data. 43 VP* I/O If OE = 1, VP = Receiver output (+) If OE = 0, VP = Driver input (+) 54 VM* I/O If OE = 1 VM, = Receiver output (-) If OE = 0, VM = Driver input (-) 65 CON I CONNECT (Input): Controls state of VPU. Refer to VPU pin description for detail. 76 GND Ground Reference. 87 SUS I Suspend: Active-High. Turns off internal circuits to reduce supply current. 99 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 0.1F decoupling capacitor for stability. A 1F capacitor is recom- mended 13 13 VPU O 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. 14 14 VBUS I USB Bus Supply Voltage: Used to power USB transceiver and internal circuitry. 8,16 NC No connect. * See Table 1 for description of logic states. M9999-112008 2 November 2008 CON NC GND VIF SUS VBUS NC VPU