MCS7715 USB to Combo Serial & Printer Port Features Applications • Single 3.3V – 5.0V operation • Low power • Full compliance with the USB V1.1 specification • Standard 16C450/550 compatible UART • Supports 920kbps data rate • Programmable baud rate generator • Modem control signals • 5, 6, 7, 8-bit character selection • Even, odd, no parity, or force parity generations • Status report capability • Single IEEE-1284 compatible printer port • Fast data rates up to 1.5M Bps • 16-byte FIFO • Software programmable printer mode selects • Microsoft compatible • Available in 48-pin LQFP package • High-speed modems • Monitoring equipment • Serial networking • Printer server • Portable backup units • Printer interface General Description Ordering Information The MCS7715 controller provides bridging between the Universal Serial Bus (USB) input an enhanced UART port and an IEEE-1284 bi-directional printer port. This device contains all the necessary logic to communicate with the host computer via the USB bus. In addition, the MCS7715 contains a 3.3V regulator and operates in bus-powered mode. The MCS7715 has a reduced frequency (6MHz) crystal oscillator. This combination of features allows significant cost savings in system design along with straightforward implementation of serial port functionality into PC peripherals using the host’s USB port. Page 2-10 Application Note • AN-7715 Evaluation Board • MCS7715-EVB Commercial Grade ( 0° C to +70° C ) MCS7715CQ MCS7715CQ-GR 48-LQFP 48-LQFP Standard RoHS MCS7715 USB to Combo Serial & Printer Port 37 PD1 38 nFAULT 39 GND 40 PD0 41 nAUTOFDX 42 nSTROBE 43 3.3V 44 nCTS 45 nDTR 46 nRI 47 GND 48 VOUT MCS7715 Pin Assignment 5V 1 36 INIT 3.3V 2 35 PD2 XTAL1 3 34 nSLCTIN XTAL2 4 33 PD3 32 PD4 GND 5 TSTPLL 6 TSTMODE 7 GND 8 29 PD5 DM 9 28 TX 31 3.3V MCS7715CQ 30 GND DP 10 27 PD6 3.3V 11 26 PD7 RESET 12 BUSY 24 PE 23 GND 21 SLCT 22 nRTS 20 RX 19 GND 17 nDSR 18 3.3V 16 nCD 15 GND 14 GND 13 25 nACK Page 2-11