MIC2550 Micrel, Inc. MIC2550 Universal Serial Bus Transceiver General Description Features The MIC2550 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 MIC2550 supports full-speed (12Mbps) dual supply Dual supply voltage operation voltage operation (patent pending) and low-speed (1.5Mbps) Integrated speed-select termination supply operation. Very low power consumption meets USB suspend- A unique dual supply voltage operation allows the MIC2550 current requirements to reference the system I/F I/O signals to a supply voltage Small 14-pin TSSOP and 16-pin MLF packages down to 2.5V while independently powered by the USB V . BUS Applications This allows the system interface to operate at its core voltage without addition of buffering logic and also reduce system Personal digital assistants (PDA) operating current. Palmtop computers Cellular telephones Ordering Information Part Number Standard Pb-Free Package MIC2550BTS MIC2550YTS 14-Pin TSSOP MIC2550BML MIC2550YML 16-Pin MLF System Diagram System 1.5k MIC2550 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 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 MIC2550 Micrel, Inc. Pin Configuration 14 VIF 1 VBUS 16 15 14 13 SPD 2 13 NC 1 12 SPD VTRM RCV 12 VTRM 3 2 11 RCV D+ 11 VP 4 D+ VP 3 10 D VM 4 9 OE 5 10 VM D 5678 9 NC 6 OE GND 7 8 SUS 16-Pin MLF (ML) 14-Pin TSSOP (TM) Pin Description Pin Name Pin Number Pin Number Pin Function MIC2550BTS MIC2550BML 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