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data bulletin MX469 1200/2400/4800bps msk modem 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480081.010 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. features applications selectable data rates 1200/2400/4800bps full-duplex msk rx and tx bandpass filters clock recovery and carrier detect capabilities pin selected xtal/clock inputs 1.008mhz or 4.032mhz radio and general applications data-over-radio pmr/cellular signaling portable data terminals personal/cordless telephone clock oscillator divider data latch digital pll rectifier s/n comparator noise filter rectifier rx filter rx enable data filter digital filter limiter limiter retriggerable monostable tx generator xtal/clock clock rate tx data i/p rx signal i/p tx signal o/p unclocked data o/p clocked data o/p rx sync o/p bandpass o/p carrier detect o/p carrier detect time constant tx sync o/p tx filter xtal f .. n v dd v ss v bias 4800 bps select tx enable 1200/ bps select 2400 the MX469 is a full-duplex pin-selectable 1200/2400/4800bps minimum shift key (msk) modem for fm radio links. the mark and space frequencies are 1200/1800, 1200/2400, and 2400/4800hz respectively. tone frequencies are phase continuous; transitions occur at the zero crossing point. the use of a common xtal oscillator with a choice of two clock frequencies (1.008mhz or 4.032mhz) provides data-rate, transmit frequencies, and rx/tx synchronization. the transmitter and receiver operate entirely independently including individual section powersave functions. the MX469 includes on-chip circuitry for carrier detect and rx clock recovery, both of which are made available at output pins. rx, tx, and carrier detect circuits contain bandpass filters to provide high quality signals in their respective paths. the carrier detect time constant is set by an external capacitor, whose value should be arranged as required to further enhance this product's performance in high-noise environments. the MX469 demonstrates high sensitivity and good bit-error-rate under adverse signal conditions. this low-power device requires few external components and is available in the following packages: 24-pin soic (MX469dw), 22-pin pdip (MX469p), and 20-pin soic (MX469d3).
1200/2400/4800bps msk modem 2 MX469 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480081.010 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. contents section page 1. block diagram................................................................................................................ 3 2. signal list.................................................................................................................. ..... 4 3. external components.................................................................................................... 6 4. general description....................................................................................................... 7 4.1 timing...................................................................................................................... ............ 7 4.1.1 1200bps ................................................................................................................... ............... 7 4.1.2 2400bps ................................................................................................................... ............... 8 4.1.3 4800bps ................................................................................................................... ............... 9 5. application .................................................................................................................. .10 5.1 synchronous modem design considerations ................................................................... 10 5.2 bit error rate.............................................................................................................. ....... 11 6. performance specifications........................................................................................ 12 6.1 electrical specifications................................................................................................... .. 12 6.1.1 absolute maximum limits ................................................................................................... .. 12 6.1.2 operating limits .......................................................................................................... .......... 12 6.1.3 operating characteristics................................................................................................. ..... 13 6.1.4 packages .................................................................................................................. ............ 15 mxcom, inc. reserves the right to change specifications at any time and without notice.
1200/2400/4800bps msk modem 3 MX469 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480081.010 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. 1. block diagram clock oscillator divider data latch digital pll rectifier s/n comparator noise filter rectifier rx filter rx enable data filter digital filter limiter limiter retriggerable monostable tx generator xtal/clock clock rate tx data i/p rx signal i/p tx signal o/p unclocked data o/p clocked data o/p rx sync o/p bandpass o/p carrier detect o/p carrier detect time constant tx sync o/p tx filter xtal f .. n v dd v ss v bias 4800 bps select tx enable 1200/ bps select 2400 figure 1: block diagram
1200/2400/4800bps msk modem 4 MX469 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480081.010 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. 2. signal list signal type description pdwd3 1 1 1 xtal/clock input the input to the on-chip inverter, for use with either a 1.008mhz or a 4.032mhz xtal or external clock. clock frequency selection is by the clock rate input pin. the selection of this frequency will affect the operational data rate of this device. refer to table 3. operation of any mx?com ic without a xtal or clock input may cause device damage. to minimize damage in the event of a xtal/drive failure, it is recommended that a current limiting device (resistor or fast-reaction fuse) be installed on the power supply (v dd ). 22 2 xtal output output of the on-chip inverter. 3 3 3 tx sync output a squarewave, produced on-chip, to synchronize the input of logic data and transmission of the msk signal (see figure 3). 5 5 4 tx signal output when the transmitter is enabled, this pin outputs the (140-step pseudo sinewave) msk signal (see figure 3). with the transmitter disabled, this output is set to a high- impedance state. 6 7 5 tx data input serial logic data to be transmitted is input to this pin. 78 6 enable tx input a logic 0 will enable the transmitter (see figure 3). a logic 1 at this input will put the transmitter into powersave while forcing tx sync out to a logic 1 and tx signal out to a high-impedance state. this pin is internally pulled to v dd . 8 9 7 bandpass output the output of the rx bandpass filter. this output impedance is typically 10k and may require buffering prior to use. 9 10 8 rx enable input the control of the rx function. the control of other outputs is provided in table 2 10 11 9 v bias power the output of the on-chip analog bias circuitry. held internally at v dd /2, this pin should be decoupled to v ss by a capacitor (c2). see figure 2 and rx enable notes. this bias voltage is maintained under all powersave conditions. 11 12 10 v ss power negative supply (gnd). 12 13 11 unclocked data output the recovered asynchronous serial data output from the receiver. 13 14 12 clocked data output the recovered synchronous serial data output from the receiver. data is latched out by the recovered clock, available at the rx sync o/p. (see figure 4 and figure 6). 14 15 13 carrier detect output for 1200 and 2400bps operation only. when an msk signal is being received this output is a logic 1. the carrier detect signal should be ignored during 4800bps operation. 15 16 14 rx signal input the msk signal input for the receiver. this input should be coupled via a capacitor, c3.
1200/2400/4800bps msk modem 5 MX469 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480081.010 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. signal type description pdwd3 17 18 15 rx sync output a flywheel squarewave output. this clock will synchronize to incoming rx msk data. (see figure 4 and figure 6). 16 19 16 1200/ 2400 bps select input a logic 1 on this pin selects the 1200bps option; tone frequencies are one cycle of 1200hz represents a logic 1, one-and-a-half cycles of 1800hz represents a logic 0. a logic 0 on this pin selects the 2400bps option; tone frequencies are one-half cycle of 1200hz represents a logic 1, one cycle of 2400hz represents a logic 0. this pin has an internal 1m pull-up resistor. operational data rate configurations are illustrated in table 3 18 20 17 4800 bps select input a logic '1' on this pin combined with a logic '0' on the 1200/2400 bps select pin will select the 4800 option (1m pulldown resistor). tone frequencies are: one-half cycle of 2400hz represents a logic '1', one cycle of 4800hz represents a logic '0'. this state can only be achieved using a 4.032mhz xtal input. operational data rate configurations are illustrated in table 3 19 21 18 clock rate input a logic input to select and allow the use of either a 1.008mhz or 4.032mhz xtal/clock. logic 1 = 4.032mhz, logic 0 = 1.008mhz. this input has an internal pulldown resistor (1.008mhz). 20 23 19 carrier detect time constant output part of the carrier detect integration function. the value of c4 connected to this pin will affect the carrier detect response time and therefore the noise performance (see figure 2, note 3). 22 24 20 v dd power positive supply. a single 5-volt supply is required. 4, 21 4, 6, 17, 22 n/c no internal connection. table 1: signal list rx enable = rx function clock data output carrier detect rx sync out 1 = enabled enable enabled enabled 0 = powersave 0 0 1 or 0 table 2: rx enable control functions xtal/clock frequency 1.008mhz 4.032mhz clock rate pin 00111 1200/2400 select pin 10100 4800 select pin 00001 data rate (bps) 1200 2400 1200 2400 4800 table 3: operational data rate configuration
1200/2400/4800bps msk modem 6 MX469 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480081.010 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. 3. external components MX469 xtal/clock tx sync out tx signal out tx data in bandpass out rx enable unclocked data out clocked data out rx signal in carrier detect out rx sync out 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 r1 c1 c2 c5 c3 c4 c7 c6 v ss v dd v dd v bias x1 xtal tx enable 4800 bps select clock rate carrier detect time constant 1200/ bps select 2400 v dd figure 2: recommended external components component notes value tolerance r1 1.0m 10% c1 33pf 5% c2 1.0f 20% c3 0.1f 20% c4 note 1 0.1f 10% c5 note 2 1.0f 25% c6 note 3 33pf 5% c7 note 2 1.0f 20% x1 note 4 1.008mhz or 4.032mhz see clock-rate pin table 4: recommended external components notes: 1. the value of c4 determines the carrier detect time constant. a long time constant results in improved noise immunity but increased response time. c4 may be varied to trade-off response time for noise immunity. 2. decoupling circuits depend upon whether the input signal is referenced to v bias or v ss . use c5 when the input signal is referenced to v bias . use c7 when the input signal is referenced to v ss . it is not necessary to use both c5 and c7. 3. c6 reduces xtal voltage overshoot. reference the mx-com xtal application note. 4. for best results, a crystal oscillator design should drive the clock inverter input with signal levels of at least 40% of v dd , peak to peak. tuning fork crystals generally cannot meet this requirement. to obtain crystal oscillator design assistance, consult your crystal manufacturer.
1200/2400/4800bps msk modem 7 MX469 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480081.010 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. 4. general description 4.1 timing 4.1.1 1200bps characteristics note min. typ. max. unit tx enable to tx sync rise time t sync 416 s tx delay, signal to disable time t eset 2.0 800 s data set-up time t dset 12.0 s data hold time t dh 2.0 s tx delay to o/p time t txd 1.2 s tx data rate period t tdr 833 s rx data rate period t rdr 800 865 s undetermined state 2.0 s internal rx delay t id 1.5 ms notes: 1. consider the xtal/clock tolerance. 2. all tx timings are related to the tx sync output. tx enable tx sync tx data 1200 bps tx output open circuit open circuit dc = don't care dv = data valid dv dc dv dc dv dc dc t eset t txd t dset dset t dh t tdr t tdr t sync figure 3: transmitter timing: 1200bps rx signal i/p 1200 bps rx sync o/p (1200hz) clocked data o/p 1 1 0 0 logic '1' t id t rdr undetermined state logic '0' logic '1' logic '0' figure 4: receiver timing diagram: 1200bps
1200/2400/4800bps msk modem 8 MX469 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480081.010 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. 4.1.2 2400bps characteristics note min. typ. max. unit tx enable to tx sync rise time t sync 208 s tx delay, signal to disable time t eset 2.0 400 s data set-up time t dset 12.0 s data hold time t dh 2.0 s tx delay to o/p time t txd 1.2 s tx data rate period t tdr 416 s rx data rate period t rdr 400 433 s undetermined state 2.0 s internal rx delay t id 1.5 ms notes: 1. consider the xtal/clock tolerance. 2. all tx timings are related to the tx sync output. tx enable tx sync tx data 2400 bps tx output open circuit open circuit dc = don't care dv = data valid dv dv dc dv dv dc dc dv dv dc dc dc dc t eset t txd t dset dset t sync t dh t tdr t tdr figure 5: transmitter timing: 2400bps rx signal i/p 2400 bps rx sync o/p (2400hz) clocked data o/p 1 1 0 0 logic '1' logic '1' t id t rdr undetermined state logic '0' logic '0' logic '1' logic '1' logic '0' logic '0' figure 6: receiver timing: 2400bps
1200/2400/4800bps msk modem 9 MX469 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480081.010 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. 4.1.3 4800bps characteristics note min. typ. max. unit tx enable to tx sync rise time t sync 104 s tx delay, signal to disable time t eset 2.0 200 s data set-up time t dset 12.0 s data hold time t dh 2.0 s tx delay to o/p time t txd 1.2 s tx data rate period t tdr 208 s rx data rate period t rdr 200 216 s undetermined state 2.0 s internal rx delay t id 1.0 ms notes: 1. consider the xtal/clock tolerance. 2. all tx timings are related to the tx sync output. tx enable tx sync tx data 4800 bps tx output open circuit open circuit dc = don't care dv = data valid dv dv dc dv dv dc dc dv dv dc dc dc dc t eset t txd t dset dset t sync t dh t tdr t tdr figure 7: transmitter timing: 4800bps rx signal i/p 4800 bps rx sync o/p (4800hz) clocked data o/p 1 1 0 0 logic '1' logic '1' t id t rdr undetermined state logic '0' logic '0' logic '1' logic '1' logic '0' logic '0' figure 8: receiver timing: 4800bps
1200/2400/4800bps msk modem 10 MX469 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480081.010 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. 5. application 5.1 synchronous modem design considerations the MX469 is an easily applied data pump, which can be used with many protocols. because it is an msk, or minimum shift keying, modem, it achieves a more noise resistant, higher data rate in a narrower bandwidth than other fsk (frequency shift keying) modems. this characteristic is especially important for wireless applications because it fundamentally determines the bandwidth of rf transmissions, which are strictly limited and controlled by regulatory agencies. using msk signaling, the MX469 data modem can achieve a 2400bps data rate within the typical 300-3000 hz voice band of many common radios. in order to achieve this advantage, an msk modem must precisely control the bit rate and timing of the modulated tx output signal bits. this control is asserted by the msk modem with a data clock signal, which is output, by the modem to pace the tx data source (e.g. a microcontroller). the data clock signal, in effect, indicates when the tx data source should provide the next tx data bit to the modem. see figure 9. because this type of interface involves the use of a modem generated bit clock signal to control the timing of when new tx data bits must be supplied from the data source, the interface is called synchronous. another characteristic of a synchronous modem is that, to receive data, it must first learn the data bit timing of the rx signal stream before it can accurately demodulate rx data bits. accordingly, a synchronous modem undergoes a period of training or synchronization when it first begins to receive a stream of msk modulated signal. during this initial receive phase, the received signal is evaluated over several bit times as the modem locks on and achieves proper receive synchronization. the training sequence, called a preamble, is a specific data pattern which must be added to the front of a transmit data stream with the start of each new transmission. a specific preamble data pattern (e.g. 16 bits of alternating 0,1,0,1 for the MX469) is used to optimize the training accuracy while minimizing the number of preamble bits required. tx data tx sync (data clock) data bit tx source (e.g. c) 0 11 give me bit 2 msk tx out msk modem transmitting i took bit 2 data: 0 1 1 give me bit 3 i took bit 3 give me bit 1 i took bit 1 figure 9: synchronous transmit operation non-synchronous or asynchronous interfaces are commonly found in wired applications which do not have the bandwidth efficiency requirements of wireless systems. a well known example is the serial port of a personal computer which can transmit a 1200 bps (or faster) data signal over a single tx signal without using an additional data clock signal to control the precise rate and timing of data bits being transmitted to a typical telephone line data modem. popular modem standards such as bell 202 and v.23 use fsk signaling to pass such asynchronous serial port data signals over telephone systems. another aspect of asynchronous interfaces and modems is that they can carry data streams which are not at the exact, nominal data rate. for example, a 1200 bps fsk modem will typically operate properly when supplied with transmit data streams of 1201 bps or 1199 bps. because of the differences in synchronous and asynchronous interfaces, they cannot successfully operate if directly connected. in other words, a personal computers rs232 serial port cannot directly interface to an msk modem. this is because: the asynchronous interface may provide data bits too fast or too slow compared to the precise rate required for msk signaling (a bit rate, or pacing, incompatibility). the timing of each specific data bit presented by an asynchronous interface will not be aligned with the precise bit timing required for msk signaling (a bit timing incompatibility). synchronous and asynchronous interface can be successfully interfaced for applications requiring the advantages of both. this typically involves the use of data buffering and retiming circuits to resolve the timing and pacing issues.
1200/2400/4800bps msk modem 11 MX469 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480081.010 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. 5.2 bit error rate error detector milli- ammeter true rms voltmeter true rms voltmeter carrier detect out high detector milli- ammeter oscilloscope buffer (interface) circuit dd v dd v tx data i/p tx sync tx signal o/p rx signal in rx sync clocked data out carrier detect out preamble & pseudo-random data generator s3 telephone channel simulator (with attenuator & 5khz bw noise gen) MX469 transmitter (components as fig. 2) MX469 receiver (components as fig. 2) figure 10: MX469 test set-up figure 11: typical variation of bit error rate with input level
1200/2400/4800bps msk modem 12 MX469 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480081.010 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. bit error rate (log scale) snr (db) bit rate bandwidth (lin scale) 0 10 -5 10 -4 2 4 6 8 10 -3 10 -2 2x10 -2 1 2 34 5 6 78 9 10 11 12 13 14 15 16 ideal coherent msk MX469 figure 12: rx bit-error-rate vs. signal-to-noise ratio 6. performance specifications 6.1 electrical specifications 6.1.1 absolute maximum limits exceeding these maximum ratings can result in damage to the device. general notes min. typ. max. units supply (v dd -v ss ) -0.3 7.0 v voltage on any pin to v ss -0.3 v dd + 0.3 v current v dd -30 30 ma v ss -30 30 ma any other pin -20 20 ma dw / d3 / p packages derating above 25 c 10 mw/ c above 25 c operating temperature -40 85 c storage temperature -55 125 c 6.1.2 operating limits correct operation of the device outside these limits is not implied. notes min. typ. max. units supply (v dd -v ss ) 4.5 5.0 5.5 v operating temperature -40 85 c xtal frequency 1.008 4.032 mhz
1200/2400/4800bps msk modem 13 MX469 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480081.010 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. 6.1.3 operating characteristics for the following conditions unless otherwise specified. v dd = 5.0v @ t amb = 25 c audio level 0db ref. = 300mv rms , xtal/clock frequency = 4.032mhz signal-to-noise ratio measured in the bit-rate bandwidth 1200bps brb = 1200hz 2400bps brb = 2400hz 4800bps brb = 4800hz notes min. typ. max. units static values supply current rx enabled, tx disabled 3.6 ma rx and tx enabled 4.5 ma rx and tx disabled 650 a logic 1 level 1 4.0 v logic 0 level 1 1.0 v digital output impedance 4.0 k analog and digital input impedance 100 k tx output impedance 0.6 1.0 k on-chip xtal oscillator r in 10.0 m r out 10.0 k inverter dc voltage gain 10.0 v/v gain bandwidth product 10.0 mhz dynamic values receiver signal input dynamic range snr = 50db 3, 4 100 230 1000 mv rms bit error rate snr = 12db 4 7.0 10 -4 1200bps 2.5 10 -4 2400bps 1.5 10 -3 4800bps 1.5 10 -3 snr = 20db 4 1200/2400/4800bps 1.0 10 -8 receiver synchronization snr =12db 7 probability of bit 8 being correct 99 % probability of bit 16 being correct 99.5 % carrier detect 5, 10 sensitivity 7, 8 150 mv rms probability of c.d. being high after bit 8 (1200bps) snr = 12db 5, 9 98 % after bit 16 snr = 12db 5, 9 99.5 % 0db noise no signal 9 5 %
1200/2400/4800bps msk modem 14 MX469 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480081.010 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. notes min. typ. max. units transmitter output tx output level 775 mv rms output level variation 1200/1800hz 0 1.0 db 1200/2400hz 0 1.0 db 2400/4800hz 0 1.0 db output distortion 3.0 5.0 % 3rd harmonic distortion 2.0 3.0 % logic 1 carrier frequency 1200bps 6 1200 hz 2400bps 6 1200 hz 4800bps 6 2400 hz logic 0 carrier frequency 1200bps 6 1800 hz 2400bps 6 2400 hz 4800bps 6 4800 hz isochronous distortion 1200hz - 1800hz/1200hz - 2400hz 25.0 40.0 s 1800hz - 1200hz/2400hz - 1200hz 20.0 40.0 s 2400hz - 4800hz/4800hz - 2400hz 10.0 20.0 s operating characteristics notes: 1. with reference to v dd = 5.0 volts. 2. xtal frequency (ref. clock rate pin), type and tolerance depends upon system requirements. 3. see figure 4 (variation of ber with input signal level). 4. snr = signal-to-noise in the bit-rate bandwidth. 5. see figure 2. 6. dependent upon xtal tolerance. 7. 10101010101 ...01 pattern. 8. measured with a 150mv rms input signal (no noise). 9. reference (0db) level for c.d. probability measurements is 230mv rms . 10. for 1200bps and 2400bps operation only: when operating at 4800bps the carrier detect output should be ignored.
1200/2400/4800bps msk modem 15 MX469 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480081.010 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. 6.1.4 packages figure 13: 24-pin soic mechanical outline: order as part no. MX469dw note : all dimensions in inches (mm.) angles are in degrees package tolerances a b c e e1 h typ. max. min. dim. j j1 k l 0.360 (9.14) 0.480 (12.19) 0.128 (3.25) 1.100 (27.94) 0.185 (4.70) 0.420 (10.67) 0.390 (9.91) 0.420 (10.67) 0.020 (0.51) 0.020 (0.51) 0.040 (1.02) 0.066 (1.68) 1.080 (27.43) 0.330 (8.38) 0.100 (2.54) 0.045 (1.14) 0.065 (1.65) 0.015 (0.38) p 0.010 (0.25) t y 7 e y e1 t c p j1 k h j l b a pin 1 figure 14: 22-pin pdip mechanical outline: order as part no. MX469p
1200/2400/4800bps msk modem 16 MX469 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480081.010 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. e l x t w pin 1 a b p j y alternative pin location marking h c k z note : all dimensions in inches (mm.) angles are in degrees package tolerances a b c e h typ. max. min. dim. j p x w t y k l 0.105 (2.67) 0.093 (2.36) 0.419 (10.64) 45 7 0 10 0.050 (1.27) 0.046 (1.17) 0.510 (12.95) 0.299 (7.59) 0.050 (1.27) 0.016 (0.41) 0.390 (9.90) 0.020 (0.51) 0.003 (0.08) 0.009 (0.23) 0.0125 (0.32) 0.013 (0.33) 0.020 (0.51) 0.036 (0.91) 0.495 (12.57) 0.286 (7.26) z 5 5 figure 15: 20-pin soic mechanical outline: order as part no. MX469d3

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