MIC2550A Micrel, Inc. MIC2550A Universal Serial Bus Transceiver General Description Features The MIC2550A is a single-chip transceiver that complies with Compliant to USB Specification Revision 2.0 for the physical layer specifications for Universal Serial Bus low-speed (1.5Mbps) and full-speed (12Mbps) operation (USB). Compliant to IEC-61000-4.2 (Level 2) Operation down to 2.5V The MIC2550A supports full-speed (12Mbps) and low-speed Dual supply voltage operation (1.5Mbps) operation and introduces superior edge rate con- Integrated speed-select termination supply trol to produce crisper eye diagrams. As a result, the task of Very low power consumption meets USB suspend- passing USB compliance testing is made easier. current requirements A unique, patented, dual supply voltage operation allows the Small 14-pin TSSOP and 16-pin MLF packages MIC2550A to reference the system I/F I/O signals to a supply Applications voltage down to 2.5V while independently powered by the USB V . This allows the system interface to operate at its BUS Personal digital assistants (PDA) core voltage without addition of buffering logic and also Palmtop computers reduce system operating current. Cellular telephones Ordering Information Part Number Standard Pb-Free Package MIC2550ABTS MIC2550AYTS 14-Pin TSSOP MIC2550ABML MIC2550AYML 16-Pin MLF System Diagram System 1.5k MIC2550A Supply Voltage HIGH SPEED VIF VTRM LOW V BUS SPEED SPD VBUS R S D+ OE D+ USB 0.47F System 24 D Interface Interface RCV D Connector R S GND VP D 24 VM 1F SUS GND GND Cooper Electronics Technologies 41206ESDA SurgX 1F min (See Applications Information 10F max for additional suppliers.) MicroLeadFrame and MLF are 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 MIC2550A Micrel, Inc. Pin Configuration VIF 1 14 VBUS SPD 2 13 NC 16 15 14 13 RCV 3 12 VTRM 1 12 SPD VTRM 2 11 RCV D+ VP 4 11 D+ VP 3 10 D VM 5 10 D VM 4 9 OE NC 6 9 OE 5678 GND 7 8 SUS 14-Pin TSSOP (TM) 16-Pin MLF (ML) Pin Description Pin Name Pin Number Pin Number Pin Function MIC2550ABTS MIC2550ABML VIF 1 15 System Interface Supply Voltage (Input): Determines logic voltage levels for system interface signaling to logic controller. SPD 2 1 Speed (Input): Edge rate control. Logic high selects full-speed edge rates. Logic low selects low-speed edge rates. RCV 3 2 Receive Data (Output): System interface receive data interface to logic controller. VP 4 3 Plus (Input/Output): System interface signal to logic controller. If OE is logic 1, VP is a receiver output (+) If OE is logic 0, VP is a driver input (+). VM 5 4 Minus (Input/Output): System interface signal to logic controller. If OE is logic 1, VM is a receiver output () If OE is logic 0, VM is a driver input (). NC 6, 13 5, 8, 13 16 Not internally connected GND 7 6 Ground: Power supply return and signal reference. SUS 8 7 Suspend (Input): Logic high turns off internal circuits to reduce supply current. OE 9 9 Output Enable (Input): Active low system interface input signal from logic controller. Logic low causes transceiver to transmit data onto the bus. Logic high causes the transceiver to receive data from the bus. D 10 10 USB Differential Data Line (Input/Output) D+ 11 11 USB Differential Data Line + (Input/Output) VTRM 12 12 Termination Supply (Output): 3.3V speed termination resistor supply output. VBUS 14 14 USB Supply Voltage (Input): Transceiver supply. M9999-031805 2 March 2005 NC NC GND VIF SUS VBUS NC NC