DATA BULLETIN LOW VOLTAGE CTCSS ENCODER/DECODER MX465 with Tx and Rx Audio Filters Features Applications * * * * * * * * * * * * * Meets TIA/EIA-603 Standards 47 CTCSS Tones + Notone TX/RX Speech Filters Improved Sinad Serial or Parallel Programming Easy P Interface Scanning on any Channel Standard 4MHz Xtal (See MX165C for 1MHz) * Low Voltage 3.3V to 5.0V Mobile Radio Channel Sharing Scan Trunking Wireless Intercom Traffic Control Hookswitch Supervision Repeater Control The MX465 CTCSS Encoder/Decoder is a low voltage, CMOS device that meets TIA/EIA-603 Standards. The MX465 will encode and decode the tones 159.8Hz, 183.5Hz, 189.9Hz, 196.6Hz, 199.5Hz, 206.5Hz, 229.1Hz, and 254.1Hz in addition to the 39 standard CTCSS tones, for a total of 47 CTCSS tones + Notone. With the incorporation of the on-chip TX and RX speech filter, the MX465 enhances voice/tone multiplexing by attenuating TX and RX speech 36dB at frequencies below 250Hz while passing signals > 300Hz with only 1dB of ripple. This not only minimizes CTCSS talk-off in the TX mode but also improves Hum and Noise performance in the RX mode. (c)1998 MX*COM, INC. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA Doc. #20480143.009 All trademarks and service marks are held by their respective companies. Low Voltage CTCSS Encoder/Decoder 2 MX465 Available in the following package styles: 24-pin TSSOP (MX465TN), 24-pin SSOP (MX465DS), 24-pin SOIC (MX465DW), 24-pin PDIP (MX465P), and 24 -pin CDIP (MX465J) the MX465 requires a single 3.3V to 5.0V supply and a 4MHz clock or crystal. CONTENTS Section Page 1 Block Diagram.......................................................................................................... 3 2 Signal List................................................................................................................. 4 3 External Components .............................................................................................. 6 4 General Description................................................................................................. 7 4.1 Description ...................................................................................................................................... 7 4.2 I/O Conditions .................................................................................................................................7 4.3 Filter Response............................................................................................................................... 8 4.4 Serial and Parallel Mode Timing..................................................................................................... 8 4.5 CTCSS Programming...................................................................................................................10 5 Performance Specification.................................................................................... 11 5.1 Electrical Performance ................................................................................................................. 11 5.1.1 Absolute Maximum Ratings ................................................................................................. 11 5.1.2 Operating Limits ................................................................................................................. 12 5.1.3 Operating Characteristics ................................................................................................... 12 5.2 Packaging......................................................................................................................................14 MX-COM, Inc. Reserves the right to change specifications at any time and without notice (c)1998 MX*COM, INC. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA Doc. #20480143.009 All trademarks and service marks are held by their respective companies. Low Voltage CTCSS Encoder/Decoder 1 3 MX465 Block Diagram Figure 1 : Block Diagram (c)1998 MX*COM, INC. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA Doc. #20480143.009 All trademarks and service marks are held by their respective companies. Low Voltage CTCSS Encoder/Decoder 2 4 MX465 Signal List Pin No. Signal Type Description 1 VDD power Positive supply. This pin should be bypassed to VSS by a capacitor mounted close to the device pins. 2 XTAL/CLOCK input Input to the on-chip inverter used with a 4 MHz Xtal or external clock source. 3 XTAL output Output of the on-chip inverter (clock output). 4 LOAD / LATCH input Controls 8 on-chip latches. It is used to latch RX / TX , PTL, and D0-D5. A logic 1 applied to this input places the 8 latches in the `transparent' mode. A logic 0 applied to this input places the 8 latches in the `latched' mode. In Parallel Mode, data is loaded and latched by a logic 1-0 transition (see Figure 4). In Serial Mode, data is loaded and latched by a 0-1-0 strobe pulse on this pin (see Figure 5). Internally pulled to VDD 5 D5 / SERIAL ENABLE 1 input Data input D5 (Parallel Mode). A logic 1 applied to this input together with a logic 0 applied to D4/SERIAL ENABLE 2 will place the device in Serial Mode (see Figure 5). Internally pulled to VDD. 6 D4 / SERIAL ENABLE 2 input Data input D4 (Parallel Mode). A logic 0 applied to this input together with a logic 1 applied to D5 / SERIAL ENABLE 1 will place the device in Serial Mode (see Figure 5). Internally pulled to VDD. 7 D3 / SERIAL DATA IN input Data input D3 (Parallel Mode). In Serial Mode this pin becomes the serial data input for D5-D0, RX/ TX and PTL (see Figure 5). D5 is clocked first and PTL last. Internally pulled to VDD. 8 D2 / SERIAL CLOCK input Data input D2 (Parallel Mode). In Serial Mode this pin becomes the SERIAL CLOCK input. Data is clocked on the positive going edge (see Figure 5). Internally pulled to VDD. 9 D1 input Data input D1 (Parallel Mode). Internally pulled to VDD. 10 D0 input 11 VSS 12 DECODE COMPARATOR REF. input Internally biased to VDD/3 or 2 VDD/3 via 1M resistors depending on the logic state of the RX TONE DECODE pin. RX TONE DECODE = 1 will bias this input 2 VDD/3; a logic 0 will bias this input VDD/3. This input provides the DECODE COMPARATOR REFERENCE voltage, and the switching of bias voltages provides hysteresis to reduce `chatter' under marginal conditions. 13 RX TONE DECODE output Gated output of the decode comparator. This output is used to gate the RX Audio path. A logic 0 on this pin indicates a successful decode and the DECODE COMPARATOR IN pin is more positive than the DECODE COMPARATOR REF. input (see Table 3). 14 DECODE COMPARATOR IN input Inverting input of the DECODE COMPARATOR. This pin is normally connected to the integrated output of the RX TONE DETECT line. (c)1998 MX*COM, INC. Data input D0 (Parallel Mode). Internally pulled to VDD. power Negative supply. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA Doc. #20480143.009 All trademarks and service marks are held by their respective companies. Low Voltage CTCSS Encoder/Decoder Pin No. Signal 5 Type MX465 Description 15 RX TONE DETECT output In RX mode this output will go to logic 1 during a successful decode. It must be externally integrated to control response and deresponse times (see Table 3). 16 TX TONE OUT output The CTCSS sinewave output appears on this pin under control of the RX/ TX pin. When not transmitting a tone, TX TONE OUT may be biased to VDD/2. (see Table 3). 17 RX/ TX input RX or TX modes selected in Parallel Mode (see Figure 4). In Serial Mode this function is serially loaded. This pin is internally pulled to VDD via a 1M resistor. 18 PTL input In RX mode this pin operates as a `Push To Listen' function by enabling the RX audio path, thus overriding the tone squelch function (Parallel Mode). In Serial Mode this function is loaded serially. Internal pull-up to VDD 19 RX AUDIO OUT output High pass filtered RX AUDIO OUT. This pin outputs audio when RX TONE DECODE = logic 0, PTL = logic 1, or when Notone is programmed (see Table 4). In TX mode this pin is biased to VDD/2. 20 TX AUDIO OUT output High pass filtered TX AUDIO OUT pin. In TX mode this pin outputs audio present at the TX AUDIO IN pin. In RX mode this pin is biased to VDD/2 21 VBIAS output Output of an internally generated VDD /2 bias level that would normally be externally bypassed to VSS via capacitor C6. 22 TX AUDIO IN input In TX mode TX AUDIO IN may be prefiltered, using the TX Audio path, thus helping to avoid talk-off due to intermodulation of speech frequencies with the transmitted CTCSS tone. Internally biased to VDD/2. 23 RX AUDIO IN input Input to the audio high pass filter in RX mode. Internally biased to VDD/2. 24 TONE INPUT input Input to the CTCSS tone detector. Internally biased to VDD/2. Table 1: Signal List (c)1998 MX*COM, INC. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA Doc. #20480143.009 All trademarks and service marks are held by their respective companies. Low Voltage CTCSS Encoder/Decoder 3 6 MX465 External Components Figure 2 : Recommended External Components for Typical Application 1.0M 10% C6 R2 560k 10% C7 R3 820k 10% C1 0.1F R1 Note 1 0.47F 20% Note 2 0.1F 20% C8 Note 2 0.1F 20% 20% C9 Note 2 0.1F 20% C2 Note 1 18pF 20% C10 Note 2 0.1F 20% C3 Note 1 33pF 20% C11 Note 2 0.1F 20% C4 Note 2 0.1F 20% D1 C5 Note 2 0.1F 20% X1 small signal Note 1 4MHz 100ppm max. Table 2: External Components External Components Notes: 1. The values specified for R1, C2, and C3 have been found to be satisfactory when used with a crystal (X1) whose equivalent series resistance is 1000 . For best results, a crystal oscillator design should drive the clock inverter input with signal levels of at least 40% of VDD, peak to peak. Tuning fork crystals generally cannot meet this requirement. To obtain crystal oscillator design assistance, consult your crystal manufacturer. 2. The 0.1 F value for the DC Blocking capacitors, C4, C5, C7, C8, C9, C10, and C11 is not a requirement. For the capacitors C4, C5, and C10, the input impedance is internal to the device and specified typical as 550k. For the remaining capacitors external circuits will be important in determining the input impedance. (c)1998 MX*COM, INC. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA Doc. #20480143.009 All trademarks and service marks are held by their respective companies. Low Voltage CTCSS Encoder/Decoder 4 7 MX465 General Description 4.1 Description Voice on shared radio channels are multiplexed with a subaudible CTCSS (Continuous Tone Controlled Subaudible Squelch) tone as a means of directing messages among user groups sharing the same RF frequencies. CTCSS modulates the transmitter with a discrete tone, from 39 standard CTCSS tones in the range (67.0Hz to 250.0Hz) according to TIA/EIA-603. There are an additional eight CTCSS tones not specified in TIA/EIA-603 that the MX465 will encode and decode. They are : 159.8Hz, 183.5Hz, 189.9Hz, 196.6Hz, 199.5Hz, 206.5Hz, 229.1Hz, and 254.1Hz, for a total of 47 CTCSS tones plus Notone. The MX465 also incorporates TX/RX on chip speech filters. In early CTCSS designs, TX speech was not filtered from the CTCSS tone, rather the filtering was dependent upon the host transmitter's pre-emphasis network. At only 6dB/octave, the attenuation of speech components at higher CTCSS tones was only a few dB which resulted in talk-off (low frequency voice components unsquelching the receiver audio). 4.2 I/O Conditions D0-D5 Tone No Tone Tone Tone Tone No Tone RX / TX 0 0 1 1 1 1 PTL 0 X 0 1 X X Decode Comparator In X X 0 0 1 X RX TONE DETECT 0 0 0 0 1 X RX TONE DECODE 1 1 1 1 0 0 Tone Transmitter Enabled Yes No (Bias) No (Bias) No (Bias) No (Bias) No (Bias) TX Audio Path Enabled Yes Yes No No No No Tone Decode Enabled No No Yes Yes Yes Yes RX Audio Path Enabled No (Bias) No (Bias) No (Bias) Yes Yes Yes 1 2 3 4 5 6 Input Pins Condition Output Pins Condition Result / Function Notes Notes: 1. Normal tone transmit condition. 2. Notone programmed in TX mode, tone transmit output set to VDD/2. TX audio path enabled. 3. Normal decode standby. 4. Normal decode standby with PTL used to enable audio. 5. Normal decode of correct CTCSS tone condition, PTL has no effect. 6. Notone programmed in RX mode, tone transmit output (Bias). RX audio path enabled. 7. X = don't care Table 3: Combinations of Input / Output conditions (c)1998 MX*COM, INC. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA Doc. #20480143.009 All trademarks and service marks are held by their respective companies. Low Voltage CTCSS Encoder/Decoder 4.3 8 MX465 Filter Response Figure 3 : Voiceband Filter Response 4.4 Serial and Parallel Mode Timing Figure 4 : Parallel Mode (c)1998 MX*COM, INC. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA Doc. #20480143.009 All trademarks and service marks are held by their respective companies. Low Voltage CTCSS Encoder/Decoder 9 MX465 Figure 5 : Serial Mode (c)1998 MX*COM, INC. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA Doc. #20480143.009 All trademarks and service marks are held by their respective companies. Low Voltage CTCSS Encoder/Decoder 4.5 10 MX465 CTCSS Programming Tone * * * Programming Inputs Nominal Frequency (Hz) MX465 Frequency (Hz) f0 (%) D5 D4 D3 D2 D1 D0 Hex 67.0 66.98 -0.029 1 1 1 1 1 1 3F 69.3 69.32 0.024 1 1 1 0 0 1 39 71.9 71.901 0.001 0 1 1 1 1 1 1F 74.4 74.431 0.042 1 1 1 1 1 0 3E 77.0 76.965 -0.046 0 0 1 1 1 1 0F 79.7 79.677 -0.029 1 1 1 1 0 1 3D 82.5 82.483 -0.021 0 1 1 1 1 0 1E 85.4 85.383 -0.020 1 1 1 1 0 0 3C 88.5 88.494 -0.007 0 0 1 1 1 0 0E 91.5 91.456 -0.048 1 1 1 0 1 1 3B 94.8 94.76 -0.042 0 1 1 1 0 1 1D 97.4 97.435 -0.036 1 1 1 0 1 0 3A 100.0 99.96 -0.040 0 0 1 1 0 1 0D 103.5 103.429 -0.069 0 1 1 1 0 0 1C 107.2 107.147 -0.05 0 0 1 1 0 0 0C 110.9 110.954 0.049 0 1 1 0 1 1 1B 114.8 114.84 0.035 0 0 1 0 1 1 0B 118.8 118.793 -0.006 0 1 1 0 1 0 1A 123.0 123.028 0.023 0 0 1 0 1 0 0A 127.3 127.328 0.022 0 1 1 0 0 1 19 131.8 131.674 -0.095 0 0 1 0 0 1 09 136.5 136.612 0.082 0 1 1 0 0 0 18 141.3 141.323 0.016 0 0 1 0 0 0 08 146.2 146.044 -0.107 0 1 0 1 1 1 17 151.4 151.441 0.027 0 0 0 1 1 1 07 156.7 156.875 0.112 0 1 0 1 1 0 16 159.8 159.936 0.085 1 1 0 0 0 1 31 162.2 162.311 0.069 0 0 0 1 1 0 06 167.9 167.708 -0.114 0 1 0 1 0 1 15 173.8 173.936 0.078 0 0 0 1 0 1 05 179.9 179.654 -0.137 0 1 0 1 0 0 14 183.5 183.680 0.098 1 1 0 0 1 0 32 186.2 186.289 0.048 0 0 0 1 0 0 04 189.9 190.069 0.089 1 1 0 0 1 1 33 192.8 192.864 0.033 0 1 0 0 1 1 13 * 196.6 196.329 -0.138 1 1 0 1 0 0 34 * 199.5 199.312 -0.094 1 1 0 1 0 1 35 203.5 203.645 0.071 0 0 0 0 1 1 03 (c)1998 MX*COM, INC. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA Doc. #20480143.009 All trademarks and service marks are held by their respective companies. Low Voltage CTCSS Encoder/Decoder 11 MX465 Tone Nominal Frequency (Hz) MX465 Frequency (Hz) f0 (%) D5 D4 D3 D2 D1 D0 Hex 206.5 206.207 -0.142 1 1 0 1 1 0 36 210.7 210.848 0.070 0 1 0 0 1 0 12 218.1 217.853 -0.113 0 0 0 0 1 0 02 225.7 225.339 -0.160 0 1 0 0 0 1 11 229.1 229.279 0.078 1 1 0 1 1 1 37 233.6 233.359 -0.103 0 0 0 0 0 1 01 241.8 241.970 0.070 0 1 0 0 0 0 10 250.3 250.282 -0.007 0 0 0 0 0 0 00 254.1 254.162 0.024 1 1 1 0 0 0 38 Notone N/A 1 1 0 0 0 0 30 Serial input mode N/A 1 0 Data Clock X X 2X * * * * Programming Inputs Not specified in the TIA/EIA tone set Table 4: CTCSS Tones 5 Performance Specification 5.1 5.1.1 Electrical Performance Absolute Maximum Ratings Exceeding these maximum ratings can result in damage to the device. Operation of the device outside the operating limits is not implied. General Min. Max. Units Supply (VDD - VSS) -0.3 7.0 V Voltage on any pin to VSS -0.3 VDD + 0.3 V VDD -30 30 mA VSS -30 30 mA any other pins -20 20 mA 800 mW 10 mW/C above 25C Current TN / DW / DIP Package Total Allowable Power Dissipation at TAMB =25C Derating above 25C Storage Temperature -55 125 C Operating temperature - 40 85 C 550 mW 9 mW/C above 25C DS Package Total Allowable Power Dissipation at TAMB =25C Derating above 25C Storage Temperature -55 125 C Operating temperature - 40 85 C (c)1998 MX*COM, INC. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA Doc. #20480143.009 All trademarks and service marks are held by their respective companies. Low Voltage CTCSS Encoder/Decoder 5.1.2 12 MX465 Operating Limits Correct operation of the device outside these limits is not implied. 5.1.3 Min. Max. Units Supply (VDD-VSS) 2.7 5.5 V Xtal Frequency 4.0 4.0 MHz Operating Temperature -40 85 C Operating Characteristics For the following conditions unless otherwise specified: VDD = 3.3V / 5.0V at TAMB = 25C, VSS = 0V, Xtal Frequency = 4.0 MHz, 100ppm max. (Over the life of the XTAL the operating range may vary from 100ppm up to 1000ppm) 0dB ref. = 750mVRMS (proportional to VDD; see note 17) Composite Signal: 1kHz test tone = 300mVRMS, f0 CTCSS tone = 30 mVRMS, 75mV RMS Noise (band limited to 6kHz Gaussian) Notes Min. Typ. Max. Units 2.7 3.3/5.0 5.5 V VDD = 5.0V 3.7 4.2 mA VDD = 3.3V 1.3 1.6 mA Static Values Supply voltage Supply current Analog input impedance 18 Analog output impedance 18 Digital Input impedance 480 k 550 400 1,18 25 Input logic 1 1 70%VDD Input logic 0 1 Output Logic 1 source = 0.1mA 2 Output Logic 0 sink = 0.1mA 2 1000 k 40 V 30%VDD 80%VDD V V 20%VDD V Dynamic Values Speech filter Total harmonic distortion 5,8,19 1.0 1.5 % Output noise level (input AC short circuit, audio switch enabled) 8,18 0.5 1.0 mVRMS Sinad 8,9 Spurious emissions 18 40 300 Bandpass ripple 8 1 7,8,19 Passband gain 1kHz TX/RX isolation (c)1998 MX*COM, INC. dB - 48 Cutoff frequency Stopband attenuation <250Hz 50 33 - 0.5 5 0 www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA Hz 1.8 36 60 dB dB dB 0.5 dB dB Doc. #20480143.009 All trademarks and service marks are held by their respective companies. Low Voltage CTCSS Encoder/Decoder 13 MX465 Notes Min. Typ. - 1.0 0 Max. Units Encoder Tone output level 12 Tone Frequency Accuracy (f error) - 0.3 1.0 dB 0.3 %f0 Risetime to 90% nominal output f0>100Hz 4,10 15 75 ms f0<100Hz 4,10 45 120 ms 19 1.5 2 % Pure tone decode threshold 19 7 15 mVRMS Composite signal decode threshold 3 30 mVRMS Decode input signal level 16 -20 3.5 dB Pure tone decode response time 13,14 95 115 140 ms Pure tone decode deresponse time 13,15 95 130 170 ms Decode response time 3,6,10 250 ms 180 250 ms Total Harmonic Distortion Decoder Deresponse time 3,10 Decode selectivity: Upper decode band edge 3,11,19,20 1.005f0 1.015f0 0.995f0+1 Hz Lower decode band edge 3,11,19,20 1.005f0-1 0.985f0 0.995f0 Hz Serial / Parallel Inputs Parallel Set Up Time (tSP) 400 ns Load / Latch Pulse Width (t L) 400 ns Serial Clock Pulse Width (tC) 400 ns Serial Data Set-Up Time (tSS) 400 ns Serial Data Hold Time (tH) 400 ns Serial Enable Time (t1) 400 ns Serial Load / Latch Set-Up Time (t2) 400 ns Serial Clock Frequency 1 MHz Operating Characteristics Notes: 1. Refers to RX/TX, PTL, Decode Comparator Input, D0-D5. 2. All logic outputs. 3. Composite signal test condition. 4. Any programming tone and RL = 10k , CL = 15pF. 5. With an input level of 0dB @1kHz 6. f0>100Hz (for 100 Hz> f0>67Hz: t=100/ f 0Hz x 250ms) 7. See Figure 3. 8. Measured in a 30kHz bandwidth. 9. With an input level of -3.5dB @1kHz 10. Per TIA/EIA-603. 11. Per TIA/EIA-603, device will not decode adjacent TIA/EIA-603 Tones. 12. Tone output level is proportional to VDD. 13. f0=156.7Hz @ -20dB. 14. Typically 12.5 Tone Cycles + 40ms. (c)1998 MX*COM, INC. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA Doc. #20480143.009 All trademarks and service marks are held by their respective companies. Low Voltage CTCSS Encoder/Decoder 14 MX465 15. Typically 7 Tone Cycles + 90ms. 16. Max composite signal is 3.5dB with: Noise (band limited 6kHz Gaussian) = -12dB ref to 1kHz test tone f0 CTCSS tone = -20dB ref to 1kHz test tone 17. For maximum dynamic range, set audio level to 0dB, VDD x150mV RMS, using minimum VDD under which system is intended to work. (e.g. for a 2.7V system, use 0dB equal to 405mVRMS ). 18. By characterization only. 19. Batch sampled only 20. For example, if: f0 = 100.0Hz (f0-1 = 97.4Hz f0+1 = 103.5Hz) 5.2 Decode Selectivity Min Typ Max Unit Upper Decode Band Edge 100. 5 101.5 102.98 Hz Lower Decode Band Edge 97.8 9 98.5 99.5 Hz Packaging Figure 6: 24-pin TSSOP Mechanical Outline: Order as part no. MX465TN (c)1998 MX*COM, INC. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA Doc. #20480143.009 All trademarks and service marks are held by their respective companies. Low Voltage CTCSS Encoder/Decoder 15 MX465 Figure 7: 24-pin-SSOP Mechanical Outline: Order as part no. MX465DS Figure 8: 24-pin SOIC Mechanical Outline: Order as part no. MX465DW (c)1998 MX*COM, INC. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA Doc. #20480143.009 All trademarks and service marks are held by their respective companies. Low Voltage CTCSS Encoder/Decoder 16 MX465 Figure 9: 24-pin-CDIP Mechanical Outline: Order as part no. MX465J Figure 10: 24-pin PDIP Mechanical Outline: Order as part no. MX465P (c)1998 MX*COM, INC. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA Doc. #20480143.009 All trademarks and service marks are held by their respective companies.