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downloaded from elcodis.com electronic components distributor MCS7705 usb 1.1 to single printer port moschip semiconductor ? 3335 kifer rd, santa clara, ca 95051 ? tel (408) 737-7141 ? fax (408) 737-7708 general description the MCS7705 controller provides bridging between the universal serial bus (usb) port, and a parallel printer port. this device contains all the necessary logic to communicate with the host computer via the usb bus. it supports printers with hardware accelerated spp mode. in addition, the MCS7705 contains a 3.3v regulator and operates in bus-powered mode. the MCS7705 has a reduced frequency (6mhz) crystal oscillator. this combination of features allows signifcant cost savings in system design along with straightforward implementation of parallel printer port functionality into pc peripherals using the hosts usb port. ordering information commercial grade (0 c to +70 c) MCS7705cq 48-qfp standard MCS7705cq-gr 48-qfp rohs features ? single 5v operation ? low power ? usb specifcation 1.1 compliant ? operation over the extended usb bus voltage range (4.5 to 5.5v) ? on-chip 3.3v voltage regulator ? internal power-on reset ? single printer port interface ? 2kv in-circuit esd protection for lower cost of external components ? available in 48-pin qfp package applications ? printer server ? printer interface application note ? an-7705 evaluation board ? MCS7705-evb free datasheet http://www.datasheet-pdf.com/
downloaded from elcodis.com electronic components distributor MCS7705 usb 1.1 to single printer port page 2 rev. 1.7 block diagram pl l & clock generator usb interface seria l interface engine descripto r t abl e standard printer por t fifo fifo dp dm xt al1 xt al2 test tstmode pd0 - p d7 nf au lt , slct , p e nack, busy nstrobe, naut ofdx nini t, nslcti n free datasheet http://www.datasheet-pdf.com/
downloaded from elcodis.com electronic components distributor MCS7705 usb 1.1 to single printer port page 3 rev. 1.7 pin-out ninit pd2 nslctin pd3 pd4 3.3v gnd pd5 n.c. pd6 pd7 nack 5v 3.3v xt al1 xt al2 gnd tstpll tstmode gnd dm dp 3.3v reset vout gn d gnd n.c. n.c. 3.3v nstrobe nautofdx pd0 gnd nfault pd1 gnd gnd n.c. 3.3v gnd n.c. n.c. n.c. gnd slct pe busy 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 MCS7705cq free datasheet http://www.datasheet-pdf.com/
downloaded from elcodis.com electronic components distributor MCS7705 usb 1.1 to single printer port page 4 rev. 1.7 pin assignments pin name pin type description xtal1 3 i crystal oscillator input, or external clock input pin (6 mhz). this signal input is used in conjunction with xtal2 to form a feedback circuit for the internal timing. two (10 pf) external capacitors connected from each side of the crystal to gnd are required to form a crystal oscillator. xtal2 4 o crystal oscillator output. see xtal1 description. tstpll 6 i test mode (active low, internal pull-up). when this pin is tied to gnd, the internal pll is bypassed and an external 48 mhz clock is used as the reference clock. tstmode 7 i internal test mode (active low, internal pull-up). when this pin is tied to gnd, the internal test mode is enabled. dm 9 i/o upstream usb port differential data minus (d-), analog. dp 10 i/o upstream usb port differential data plus (d+), analog. reset 12 i system reset (active high). resets all internal registers, sequencers, and signals to a consistent state. connect to gnd to use the internal power-on-reset circuit. slct 22 i peripheral/printer selected (internal pull-up). this pin is set high by the peripheral/printer when it is selected. pe 23 i paper empty (internal pull-up). this pin is set high by the peripheral/printer when printer paper is empty. busy 24 i peripheral/printer busy (internal pull-up). this pin is set high by the peripheral/printer when the printer or peripheral is not ready to accept data. nack 25 i peripheral/printer data acknowledge (internal pull-up). this pin is set low by the peripheral/printer to indicate a successful data transfer has taken place. pd7 26 i/o parallel printer port data bit 7. pd6 27 i/o parallel printer port data bit 6. pd5 29 i/o parallel printer port data bit 5. pd4 32 i/o parallel printer port data bit 4. pd3 33 i/o parallel printer port data bit 3. free datasheet http://www.datasheet-pdf.com/
downloaded from elcodis.com electronic components distributor MCS7705 usb 1.1 to single printer port page 5 rev. 1.7 pin name pin type description nslctin 34 i/o peripheral/printer select (open-drain). selects the peripheral/printer when it is set low. pd2 35 i/o parallel printer port data bit 2. ninit 36 i/o initialize the peripheral/printer (open drain). when set low, the peripheral/printer starts its initialization routine. pd1 37 i/o parallel printer port data bit 1. nfault 38 i peripheral/printer data error (internal pull-up). this pin is set low by the peripheral/printer during an error condition. pd0 40 i/o parallel printer port data bit 0. nautofdx 41 i/o peripheral/printer auto feed (open-drain). continuous autofed paper is selected when this pin is set low. nstrobe 42 i/o peripheral/printer data strobe (open drain). data is latched into the peripheral/printer when the nstrobe is low. vout 48 pwr +3.3v voltage regulator output. gnd 5,8,13,46, 14, 17,21, 30, 39,47 pwr power and signal ground. 3.3v 2, 11, 16, 31, 43 pwr device supply inputs. all should be connected to the vout pin. vout voltage is gated by reset. 5v 1 pwr main power input. connect to usb vbus or local vdd. note: all names with n prefx are active low. free datasheet http://www.datasheet-pdf.com/
downloaded from elcodis.com electronic components distributor MCS7705 usb 1.1 to single printer port page 6 rev. 1.7 usb description analog transceivers the on-chip transceivers are connected directly to usb cables through external series resistors. they transmit and receive serial data at both full-speed (12mbit/s) and low-speed (1.5mbit/s) data rates. slew rates are automatically adjusted according to the speed of the device connected and lie within the range defned in the usb specifcation rev. 1.1 . serial interface engine this engine implements the complete usb protocol layer including: parallel /serial conversion, synchronization pattern recognition, crc checking/generation, bit (de)stuffng, packet identifer (pid) verifcation/generation, address recognition and handshake evaluation/generation. bit clock recovery the bit clock recovery circuit recovers the clock from the incoming usb data stream using 4x over sampling. it is able to track in the presence of jitter and frequency drift as specifed by the usb specifcation rev . 1.1. 3.3v source a 5v to 3.3v dc-dc regulator is integral to the chip relieving the need for a +3.3v source. it supplies the analog transceivers and internal logic and can be used to supply the 1.5k : pull-up resistor on the dp line of the upstream connection. pll clock multiplier an integral phase-locked loop (pll) performs 6 to 48mhz clock multiplication and requires no external components except the crystal. this allows for the use of low-cost 6mhz crystals which reduce high frequency radiated electro-magnetic interference (emi). free datasheet http://www.datasheet-pdf.com/
downloaded from elcodis.com electronic components distributor MCS7705 usb 1.1 to single printer port page 7 rev. 1.7 host requests all standard usb requests from the host are handled via control endpoint-0. the control endpoint can handle a maximum of 8 bytes per transfer. this table shows the supported standard usb requests. note: the usb data transmission order is least signifcant bit (lsb) frst. in the following tables multi-byte variables are displayed least signifcant byte frst. standard usb requests requestname bmrequesttype byte 0 [7:0] (bin) brequest byte 1 (hex) wvalue byte 2, 3 (hex) windex byte 4, 5 (hex) wlength byte 6, 7 (hex) data address set address x000 0000 05 address** 00,00 00,00 none confguration get confguration 1000 0000 08 00,00 00,00 01,00 confguration value = 0x01 set confguration-0 x000 0000 09 00,00 00,00 00,00 none set confguration-1 x000 0000 09 01,00 00,00 00,00 none descriptor get confguration descriptor 1000 0000 06 00,02 00,00 length*** confguration, interface, and endpoint descriptors get device descriptor 1000 0000 06 00,01 00,00 length*** device descriptor feature clear feature (remote_wakeup) x000 0000 01 01,00 00,00 00,00 none clear endpoint (1) feature (halt/stall) x000 0010 01 00,00 81,00 00,00 none status get device status 1000 0000 00 00,00 00,00 02,00 device status get interface status 1000 0001 00 00,00 00,00 02,00 zero get endpoint (0) status 1000 0010 00 00,00 00/80, 00* 02,00 endpoint-0 status get endpoint (1) status 1000 0010 00 00,00 81,00 02,00 endpoint-1 status * the msb specifes endpoint direction: 0 = out, 1 = in. either value is accepted. ** device address: 0 to 127 *** returned value (in bytes) standard usb descriptors these are the supported standard usb descriptors: x device x confguration interface x endpoint free datasheet http://www.datasheet-pdf.com/
downloaded from elcodis.com electronic components distributor MCS7705 usb 1.1 to single printer port page 8 rev. 1.7 device descriptors offset (bytes) field name size (bytes) value (hex) comments 0 blength 1 12 descriptor length = 18 bytes 1 bdescriptortype 1 01 type = device 2 bcdusb 2 10,01 usb specifcation rev-1.1 4 bdeviceclass 1 ff vendor class 5 bdevicesubclass 1 00 n/a 6 bdeviceprotocol 1 ff vendor class 7 bmaxpacketsize0 1 08 packet size = 8 bytes 8 idvendor 2 10,97 the moschip vendor-id (9710) 10 idproduct 2 05,77 the MCS7705 product-id 12 bcddevice 2 00,01 the silicon revision (1.0) 14 imanufacturer 1 00 no manufacturer string 15 iproduct 1 00 no product string 16 iserialnumber 1 00 no serial number string 17 bnumconfgurations 1 01 one confguration confguration descriptors offset (bytes) field name size (bytes) value (hex) comments 0 blength 1 09 descriptor length = 9 bytes 1 bdescriptortype 1 02 type = configuration 2 wtotallength 2 27,00 combined length of confguration, + interface, + all endpoint descriptors (39 bytes) 4 bnuminterfaces 1 01 one interface 5 bconfguration 1 01 confguration value = 1 6 iconfguration 1 00 no confguration string 7 bmattributes 1 a0 bus-powered with remote wake-up 8 maxpower 1 32 100ma default interface descriptors offset (bytes) field name size (bytes) value (hex) comments 0 blength 1 09 descriptor length = 9 bytes 1 bdescriptortype 1 04 type = interface 2 binterfacenumber 1 00 n/a 3 balternatesetting 1 00 no alternate setting 4 bnumendpoints 1 03 three endpoints 5 binterfaceclass 1 ff vendor class 6 binterfacesubclass 1 00 n/a 7 binterfaceprotocol 1 ff vendor class 8 binterface 1 00 no interface string free datasheet http://www.datasheet-pdf.com/
downloaded from elcodis.com electronic components distributor MCS7705 usb 1.1 to single printer port page 9 rev. 1.7 endpoint descriptions there are three end points apart from the control endpoint endpoint type function size 0 control endpoint default functionality 1 bulk-in parallel printer port 32bytes 2 bulk-out parallel printer port 32 bytes 3 interrupt status endpoint 4 bytes endpoint descriptor #1 bulk-in (parallel port) offset (bytes) field name size (bytes) value (hex) comments 0 blength 1 07 descriptor length = 7 bytes 1 bdescriptortype 1 05 type = endpoint 2 bendpointaddress 1 81 endpoint-1, direction: in 3 bmaddress 1 02 bulk endpoint 4 wmaxpacketsize 2 20,00 packet size = 32 bytes 6 binterval 1 ff polling interval (255ms) endpoint descriptor #2 bulk-out (parallel port) offset (bytes) field name size (bytes) value (hex) comments 0 blength 1 07 descriptor length = 7 bytes 1 bdescriptortype 1 05 type = endpoint 2 bendpointaddress 1 02 endpoint-2, direction: out 3 bmaddress 1 02 bulk endpoint 4 wmaxpacketsize 2 20,00 packet size = 32 bytes 6 binterval 1 ff free datasheet http://www.datasheet-pdf.com/
downloaded from elcodis.com electronic components distributor MCS7705 usb 1.1 to single printer port page 10 rev. 1.7 endpoint descriptor #3 status endpoint offset (bytes) field name size (bytes) value (hex) comments 0 blength 1 07 descriptor length = 7 bytes 1 bdescriptortype 1 05 type = endpoint 2 bendpointaddress 1 87 endpoint-7, direction: in 3 bmaddress 1 03 interrupt endpoint 4 wmaxpacketsize 2 04,00 packet size = 4 bytes 6 binterval 1 01 polling interval (1ms) status endpoint: the status endpoint returns 4 bytes every 1 millisecond. these four bytes are status information of the parallel printer port. ? byte-1: reserved (unused) ? byte-2: reserved (unused) ? byte-3: device status register of the parallel printer port (dsr) ? byte-4: fifo status of the parallel printer port. description for byte-4 of status endpoint. bit[7] bit[6] bit[5] bit[4] bit[3] bit[2] bit[1] bit[0] reserved reserved reserved reserved paroutfifo empty paroutfifo full parinfifo empty parinfifo full bit description parinfifo full 1 indicates the bulk-in fifo is full. (parallel printer port) parinfifo empty 1 indicates the bulk-in fifo is empty. (parallel printer port) paroutfifo full 1 indicates the bulk-out fifo is full. (parallel printer port) paroutfifo empty 1 indicates the bulk-out fifo is empty. (parallel printer port) free datasheet http://www.datasheet-pdf.com/
downloaded from elcodis.com electronic components distributor MCS7705 usb 1.1 to single printer port page 11 rev. 1.7 usb vendor specifc commands: the purpose of the vendor commands is to confgure the parallel printer port. the following tables provide information for the vendor specifc commands. parallel printer port get application vendor specifc command (parallel printer port) bmrequesttype brequest wvalue windex wlength register name 0xc0 0x0d 0x01 xx 0x0000 0x0001 pp_dpr 0xc0 0x0d 0x01 xx 0x0001 0x0001 pp_dsr 0xc0 0x0d 0x01 xx 0x0002 0x0001 pp_dcr 0xc0 0x0d 0x01 xx 0x0008 0x0001 pp_c_fifo 0xc0 0x0d 0x01 xx 0x0008 0x0001 pp_conf_a 0xc0 0x0d 0x01 xx 0x0009 0x0001 pp_conf_b 0xc0 0x0d 0x01 xx 0x000a 0x0001 pp_ecr set application vendor specifc command (parallel printer port) bmrequesttype brequest wvalue windex wlength register name 0x40 0x0e 0x01 xx 0x0000 0x0000 pp_dpr 0x40 0x0e 0x01 xx 0x0001 0x0000 pp_dsr 0x40 0x0e 0x01 xx 0x0002 0x0000 pp_dcr 0x40 0x0e 0x01 xx 0x0008 0x0000 pp_c_fifo 0x40 0x0e 0x01 xx 0x0008 0x0000 pp_conf_a 0x40 0x0e 0x01 xx 0x0009 0x0000 pp_conf_b 0x40 0x0e 0x01 xx 0x000a 0x0000 pp_ecr vendor specifc command parameters brequest : specifes whether to read or write 0x0e = write to the application register. 0x0d = read from the application register. wvalue : specifes the application number. 0x0100 is the application number for the parallel printer port. 0x0200 is reserved. 0x0000 is the application number provided for accessing the other control registers to control the parallel printer port (i.e. setting the clock frequency, etc.) xx specifes the byte value to be written into the register. windex : is the offset of the register to read/write. wlength : is the length of the data we are going to read or write. free datasheet http://www.datasheet-pdf.com/
downloaded from elcodis.com electronic components distributor MCS7705 usb 1.1 to single printer port page 12 rev. 1.7 parallel printer port register descriptions data register the data register is cleared at initialization by reset. during a write operation, the contents of this register are buffered and output onto the pd7-pd0 ports. during a read operation pd7-pd0 ports are buffered and output to the host cpu. register: pp_dpr description: parallel printer data register offset: 000 permissions: read/write access condition: application number = 0x0100 bit[7] bit[6] bit[5] bit[4] bit[3] bit[2] bit[1] bit[0] parallel printer data device status register the bits of the status register are defned as follows: register: dsr description: device status register offset: 001 permissions: read access condition: application number = 0x0100 bit[7] bit[6] bit[5] bit[4] bit[3] bit[2] bit[1] bit[0] nbusy nack pe slct fault unused unused unused bit name description 0 unused not used, set to 0 1 unused not used, set to 0 2 unused not used, set to 0 3 fault logic 0 = printer reports error condition logic 1 = normal operation. 4 slct logic 0 = printer is off line. logic 1 = printer is on line. 5 pe logic 0 = normal operation logic 1 = paper end/empty is detected 6 nack logic 0 = state of the nack pin (ack = high). logic 1 = state of the nack pin (ack = low). 7 nbusy logic 0 = nbusy pin is high, printer is not ready to take data. logic 1 = nbusy pin is low, printer is ready to take data. free datasheet http://www.datasheet-pdf.com/
downloaded from elcodis.com electronic components distributor MCS7705 usb 1.1 to single printer port page 13 rev. 1.7 device control register register: dcr description: device control register offset: 002 permissions: read/write access condition: application number = 0x0100 bit[7] bit[6] bit[5] bit[4] bit[3] bit[2] bit[1] bit[0] unused unused dir unused nslctin init nautofd nstrobe bit name description 0 nstrobe logic 0 = sets the nstrobe pin to high. logic 1 = sets the nstrobe pin to low. pd7-pd0 data are latched into printer 1 nautofd logic 0 = sets the nautofd pin to high. printer generates auto line feed after each line is printed. logic 1 = sets the nautofd pin to low. no auto feed function. 2 init logic 0 = sets the init pin to high. logic 1 = sets the init pin to low. peripheral/printer starts its initialization routine. 3 nslctin logic 0 = sets the nslctin pin to high. selects the printer. logic 1 = sets the nslctin pin to low. printer is not selected. 4 unused not uset set to 0 5 dir logic 0 = pd7-pd0 pins are confgured for output mode. logic 1 = pd7-pd0 pins are confgured for input mode. 6 unused not used, set to 0. 7 unused not used, set to 0. free datasheet http://www.datasheet-pdf.com/
downloaded from elcodis.com electronic components distributor MCS7705 usb 1.1 to single printer port page 14 rev. 1.7 extended control register (ecr) this register controls the parallel port mode selection operation. register: pp_ecr description: parallel printer port extended control register offset: 0x0a permissions: read/write access condition: application number = 0x0100 bit[7] bit[6] bit[5] bit[4] bit[3] bit[2] bit[1] bit[0] parallel port mode reserved reserved reserved reserved reserved bit-7 bit-6 bit-5 operating mode 0 0 0 spp 0 0 1 nibble 0 1 0 cb-fifo mode 0 1 1 not used 1 0 0 not used 1 0 1 not used 1 1 0 not used 1 1 1 not used free datasheet http://www.datasheet-pdf.com/
downloaded from elcodis.com electronic components distributor MCS7705 usb 1.1 to single printer port page 15 rev. 1.7 mode changes after a hardware reset nibble mode is selected as the default mode. it is required to select mode 000 or 001 before any other mode confguration. mode 000 spp/centronics/compatible mode forward direction only. the direction bit is forced to 0 and pd7-pd0 are set to the output direction. the parallel port is under software control. this mode defnes the protocol used by most pcs to transfer data to a printer. it is commonly called the centronics mode and is the method utilized with the standard parallel printer port. data is placed on the pd7-pd0 ports, and the printer status is checked via the dsr register. if no error condition is fagged and the printer is not busy, software toggles the nstrobe pin to latch the pd7-pd0 data into the printer. this operating cycle continues when the printer/peripheral issues the data acknowledge signal (pulses the ack and nbusy pins). mode 001 nibble mode the nibble mode is the most common way to get reverse channel data from the printer or peripheral. this mode is usually combined with the spp mode or a proprietary forward channel mode to create a bi- directional channel. in this mode printer status bits are used as nibble bits. pin data bit nbusy bit-7 pe bit-6 slct bit-5 nfault bit-4 nbusy bit-3 pe bit-2 slct bit-1 nfault bit-0 bit order for nibble mode mode 010 fifo output mode in this mode, bytes written to the fifo are transmitted automatically using the spp/centronics standard protocol. free datasheet http://www.datasheet-pdf.com/
downloaded from elcodis.com electronic components distributor MCS7705 usb 1.1 to single printer port page 16 rev. 1.7 pp_register: this register is used for internal debugging of udc controller & bridge circuitry. there is a bit which resets the parallel printer port. there are bits which control the input clock fed to the parallel printer port. register: pp_reg description: parallel printer port register offset: 0x04 permissions: read/write access condition: application number = 0x0000 bit[7] bit[6] bit[5] bit[4] bit[3] bit[2] bit[1] bit[0] pp_reset clk_freq_select pp_bi_clear pp_bo_clear reserved udc_loop bit description udc_loop when enabled, loops the data from the bulk-out fifo to the bulk-in fifo. reserved reserved pp_bo_clear reset the bulk-out fifo pp_bi_clear reset the bulk-in fifo clk_freq_select changes the clock fed to the parallel printer port. pp_reset resets the parallel printer port pp reset: this bit will reset the parallel printer port. when this bit is a 1 the parallel printer port is under the reset process. whenever the frequency is to be changed, frst set the reset bit, change the clk_ frequency, and fnally clear the reset bit to 0. clk_freq_select: changes the clock fed to the parallel printer port as shown in the table below. option input clock frequency 3b000 12 mhz 3b001 6 mhz 3b010 3 mhz 3b011 1.5 mhz 3b100 0.75 mhz free datasheet http://www.datasheet-pdf.com/
downloaded from elcodis.com electronic components distributor MCS7705 usb 1.1 to single printer port page 17 rev. 1.7 electrical characteristics absolute maximum ratings supply voltage 6 volts input voltage (i/o) -0.3 to v cc +0.3 storage temperature -60 c to +150 c recommended operating conditions supply voltage 4.5 to 5.5 volts input voltage (i/o) 0 to 5.5 volts ambient operating temperature (free air) 0 c to +70 c junction operating temperature 0 c to +115 c static characteristics (supply pins) v cc = 4.5v to 5.5v; gnd = 0v; temp = 0 to +70 c; unless otherwise specifed symbol parameter conditions min typical max unit v reg (3.3v) regulated supply voltage 3.0 3.3 3.6 v i cc operating supply current - 18 - ma static characteristics v cc = 4.5v to 5.5v; gnd = 0v; temp = 0 to +70 c; unless otherwise specifed symbol parameter conditions min typical max unit v il low level input voltage - - 0.3*vcc v v ih high level input voltage 0.7*vcc - - v v th (lh) positive going threshold voltage - 3.22 - v v th (hl) negative going threshold voltage - 1.84 - v i li input leakage current - - 1 a i oz tri-state leakage current - - 10 a v ol output voltage (low ) - - 0.4 v v oh output voltage (high ) 3.5 - - v dynamic characteristics C analog i/o pins (dp, dm); full-speed mode v cc = 4.5v to 5.5v; gnd = 0v; temp = 0 to +70 c; unless otherwise specifed symbol parameter condition min typical max unit t fr rise time c l = 50pf 10% to 90% of |v oh - v ol | 4 - 20 ns t ff fall time c l = 50pf 10% to 90% of |v oh - v ol | 4 - 20 ns free datasheet http://www.datasheet-pdf.com/
downloaded from elcodis.com electronic components distributor MCS7705 usb 1.1 to single printer port page 18 rev. 1.7 e he d hd e b a2 a1 l c 1 12 13 24 36 48 25 37 symbol millimeters inches min typical max min typical max a1 0.05 0.15 0.002 0.006 a2 1.35 1.45 0.053 0.057 b 0.17 0.27 0.007 0.011 c 0.09 0.20 0.004 0.008 e 0.50 0.0197 l 0.45 0.75 0.018 0.030 hd 8.80 9.20 0.346 0.362 d 7.20 6.80 0.283 0.268 he 8.80 9.20 0.346 0.362 e 7.20 6.80 0.2.83 0.268 48-pin qfp package dimensions free datasheet http://www.datasheet-pdf.com/
downloaded from elcodis.com electronic components distributor MCS7705 usb 1.1 to single printer port page 19 rev. 1.7 important notice moschip semiconductor technology, ltd products are not authorized for use as critical components in life support devices or systems. life support devices are applications that may involve potential risks of death, personal injury or severe property or environmental damages. these critical components are semiconductor products whose failure to perform can be reasonably expected to cause the failure of the life support systems or device, or to adversely impact its effectiveness or safety. the use of moschip semiconductor technology ltds products in such devices or systems is done so fully at the customer risk and liability. as in all designs and applications it is recommended that the customer apply suffcient safeguards and guard bands in both the design and operating parameters. moschip semiconductor technology ltd assumes no liability for customers applications assistance or for any customers product design(s) that use moschip semiconductor technology, ltds products. moschip semiconductor technology, ltd warrants the performance of its products to the current specifcations in effect at the time of sale per moschip semiconductor technology, ltd standard limited warranty. moschip semiconductor technology, ltd imposes testing and quality control processes that it deems necessary to support this warranty. the customer should be aware that not all parameters are 100% tested for each device. suffcient testing is done to ensure product reliability in accordance with moschip semiconductor technology ltds warranty. moschip semiconductor technology, ltd believes the information in this document to be accurate and reliable but assumes no responsibility for any errors or omissions that may have occurred in its generation or printing. the information contained herein is subject to change without notice and no responsibility is assumed by moschip semiconductor technology, ltd to update or keep current the information contained in this document, nor for its use or for infringement of patent or other rights of third parties. moschip semiconductor technology, ltd does not warrant or represent that any license, either expressed or implied, is granted to the user. free datasheet http://www.datasheet-pdf.com/
downloaded from elcodis.com electronic components distributor MCS7705 usb 1.1 to single printer port page 20 rev. 1.7 revision history revision changes date 1.0 preliminary release 6-nov-2002 1.1 datasheet updated for printer port related details 7-feb-2005 1.2 revised data sheet 25-oct-2005 1.3 minor layout changes 17-nov-2005 1.4 changes to printer port section 29-nov-2005 1.5 corrected polling intervals 30-nov-2005 1.6 1.7 corrected electrical characteristics and pin names pin no: 46 description corrected in data sheet 6-jan-2006 6-aug-2007 free datasheet http://www.datasheet-pdf.com/

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