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XR-T6164A ...the analog plus company tm digital line interface transceiver rev. 1.00 1997 exar corporation, 48720 kato road, fremont, ca 94538 (510) 668-7000 fax (510) 668-7017 1 june 19973 features single 5v supply compatible with ccitt g.703 64kbps co-direction- al interface recommendation when used with ei- ther xrt6165 or xrt6166 low power converts balanced bipolar transmit and receive signals propagated over two twisted pair cables to ttl compatible dual-rail data links remote equipment equipped with ccitt g.703 64kbps codirectional interfaces over dis- tances up to 500 meters without equlaization receive data comparator threshold storage provides ping-pong operation capability loss of signal alarm dual matched driver outputs applications data adaption unit (dau) general purpose ttl compatible line interface general description the XR-T6164A is a bipolar analog chip intended for general purpose line interface applications at bit rates up to 1.544mbps (t1). it contains both receive and transmit circuitry in a 16 pin dual-in-line plastic package. the receiver is designed for short line applications having a cable loss up to 10db measured at the half bit rate. the transmitter has open collector line driver outputs that are capable of handling up to 40ma. when used in conjunction with either xr-t6165 or xr-t6166, the chip set provides a 64kbps codirectional interface as specified in ccitt g.703. ordering information part no. package operating temperature range XR-T6164Aip 16 lead 300 mil pdip -40 c to +85 c XR-T6164Aid 16 lead 300 mil jedec soic -40 c to +85 c
XR-T6164A 2 rev. 1.00 block diagram figure 1. XR-T6164A block diagram ttl buffer ttl buffer 12 s+r positive data comparator negative data comparator peak detector threshold generator 16 rx+i/p 1 rx-i/p 14 peak cap 15 tcm con 13 v cc a bias tcm control 5 s-r 2 i/p bias ttl buffer 3 rx alarm 10 tx+o/p 8 tx-o/p open collector driver open collector driver 4 gnda 11 tx+i/p 6 tx-i/p 9 v cc d 7 gndd + - + -
XR-T6164A 3 rev.1.00 pin configuration 16 lead pdip (0.300o) rx+i/p tcm con peak cap v cc a s+r tx+i/p tx+o/p v cc d rx-i/p i/p bias rx alarm gnda s-r tx-i/p gndd tx-o/p 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 16 lead soic (jedec, 0.300o) 16 1 9 8 2 3 4 5 6 7 15 14 13 12 11 10 rx-i/p i/p bias rx alarm gnda s-r tx-i/p gndd tx-o/p rx+i/p tcm con peak cap v cc a s+r tx+i/p tx+o/p v cc d pin description pin# symbol type description 1 rx-i/p i receiver negative bipolar input. line analog input. 2 i/p bias o receive input bias. connects to center tap of input transformer secondary winding. 3 rx alarm o loss of signal alarm. active low. 4 gnda analog ground. 5 s-r o receive negative data output. output from negative bipolar input pulses (active low). 6 tx-i/p i transmit negative input data. input for negative output driver (active low). 7 gndd digital ground. 8 tx-o/p o transmit negative output driver. open collector, drives output transformer primary. 9 v cc d +5v 5% digital supply. 10 tx+o/p o transmit positive output driver. open collector, drives output transformer primary. 11 tx+i/p i transmit positive input data. input for positive output driver (active low). 12 s+r o receive positive data output. output from positive bipolar input pulses (active low). 13 v cc a +5v 5% analog supply. 14 peak cap peak detector capacitor. stores peak detector voltage. 15 tcm con i time compression multiplex control. when active, disconnects peak detector charge and discharge paths (active low). 16 rx+i/p i receiver positive bipolar input. line analog input.
XR-T6164A 4 rev. 1.00 electrical characteristics test conditions: v cc = 5v 5%, t a = -40 c to 85 c, unless otherwise specified parameters min. typ. max. units conditions dc electrical characteristics supply voltage 4.75 5 5.25 v analog supply current 7 10 ma digital supply current 17 22 ma receiver input signal 1 2.2 vp measured from pins 1 or 16 with respect to pin 2 dynamic range 10 db maximum cable loss range input impedance 20 k w measured between pins 1 and 16 input slicing threshold 50 % percent of peak input signal amplitude input bias voltage 1.45 v measured at pin 2 loss of signal alarm threshold 150 mvp measured from pins 1 or 16 with respect to pin 2 loss of signal alarm level hysteresis 1.5 db difference between alarm-on and alarm-off levels peak detector leakage -80 m a data output low 0.4 v measured at pins 5 or 12, i out = +1.6ma data output high 3.0 v measured at pins 5 or 12, i out = -40 m a alarm output low 0.4 v measured at pin 3; i out = +1.6ma alarm output high v cc - 0.5 v measured at pin 3; i out = -40 m a tcm input low voltage 0.8 v measured at pin 15; i in min = -500 m a, i in max = +5 m a transmitter input low voltage 0.8 v measured at pins 6, 11; i in = -700 m a input high voltage 2.2 v measured at pins 6, 11; i in = +5 m a output low voltage 1.2 v measured at pins 8, 10; i out = -40ma output low current 40 ma measured at pins 8, 10; v out = 1.2v output leakage current -100 m a measured at pins 8, 10; v out = 10v outputs in off state ac electrical characteristics receiver input level 1 2.2 vp pin 1, 16 with respect to pin 2 1 output rise time 80 ns pins 5, 12; c l = 15pf, 10% to 90% output fall time 80 ns pins 5, 12; c l =15pf, 90% to 10% notes 1 higher input voltages are possible if a resistive input attenuator is used. bold face parameters are covered by production test and guaranteed over operating temperature range.
XR-T6164A 5 rev.1.00 electrical characteristic (cont'd) parameters min. typ. max. units conditions ac electrical characteristics (cont'd) transmitter output rise time 80 ns pins 8, 10; r l = 130, c l = 15pf, 10% to 90% output fall time 80 ns pins 8, 10; r l = 130, c l = 15pf, 90% to 10% rising edge delay 100 ns pins 8, 10; r l = 130, c l = 15pf, 50% to 50% (i/p to o/p) falling edge delay 100 ns pins 8, 10; r l = 130, c l = 15pf, 50% to 50% (i/p to o/p) notes bold face parameters are covered by production test and guaranteed over operating temperature range. specifications are subject to change without notice absolute maximum ratings supply voltage 20v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . storage temperature -65 c to +150 c . . . . . . . . . . . . magnetic supplier information: pulse telecom product group p.o. box 12235 san diego, ca 92112 tel. (619) 674-8100 fax. (619) 674-8262 transpower technologies, inc. 24 highway 28, suite 202 crystal bay, nv 894020187 tel. (702) 8310140 fax. (702) 8313521
XR-T6164A 6 rev. 1.00 system description the XR-T6164A is a general purpose line interface chip that contains the receive and transmit circuitry necessary to convert ttl logic levels to a bipolar signal both to and from a twisted pair cable. receiver the XR-T6164A receiver section converts a balanced bipolar signal that has been attenuated and distorted by up to 10db of twisted pair cable to active-low ttl compatible logic levels. the cable is transformer coupled to the receiver differential inputs (rx+ip, rx-ip) which are biased through the input transformer secondary winding by a voltage generated on-chip (i/p bias). the bipolar receive signal is applied to a peak detector, and to a pair of data comparators. the peak detector output voltage charges an external capacitor connected to peak cap. this voltage generates a data comparator bias level that is approximately 50% of the peak input pulse amplitude. thus, data slicing is automatically accomplished at the optimum level over the full cable loss range. ttl compatible output stages buffer the receiver digital outputs (s+r, s-r) and provide active low signals corresponding to received positive and negative input pulses. loss of input signal is detected by a comparator that monitors input signal level. an active-low ttl compatible logic level (rx alarm) indicates signal loss. comparator hysteresis prevents chatter on this output. ping-pong operation is made possible by the time compression multiplex control input (tcm con). a logic 0 applied to this pin during transmission stores the peak detector output voltage by disconnecting the peak detector storage capacitor charge and discharge paths. since the receive data comparator bias voltage is stored during transmit mode, it is immediately available when receive mode resumes. transmitter the XR-T6164A transmitter section contains two matched open collector output drivers that are capable of driving the line transformer directly with a current up to 40ma. the transmitter output drivers include diode clamps to ensure non-saturating operation. transmitter digital inputs, which are active-low, are ttl compatible. external resistors are used between the transmitter outputs and the output transformer primary to set the output pulse amplitude. application information figure 2 shows a general line driver application circuit using the XR-T6164A. this device converts bipolar transmit and receive signals in the 64kbps to 1.544mbps range to active-low ttl compatible logic levels. bipolar signals that have been attenuated and distorted by twisted pair cable are transformer-coupled to the line side of the XR-T6164A as shown on the left side of figure 2 . suggested transformers for both the input and output applications are the pulse types pe-65535 or tti7147 for 64kbps use and the pe-65835 for 1.544mbps applications. the right side of figure 2 shows the ttl compatible digital inputs and outputs. please refer to the pin description section of this data sheet for detailed information about each signal.
XR-T6164A 7 rev.1.00 +5v tip ring receive input 0.1 m f 0.1 m f 1:2 480 0.1 m f rx+i/p 16 rx-i/p 1 i/p bias 2 peak cap 14 tx+o/p 10 tx-o/p 8 47 9 13 s+r 12 s-r 5 rx alarm 3 tcm con 15 tx-i/p 6 tx+i/p 11 XR-T6164A 0.1 m f rxdata+ rxdata- rx alarm tcm con tx data+ tx data- 300 300 1:2 +5v 0.1 m f tip ring transmit output gnda gndd v cc a v cc d figure 2. XR-T6164A line driver application pe-65535 tti-7147 pe-65535 tti-7147
XR-T6164A 8 rev. 1.00 16 lead plastic dual-in-line (300 mil pdip) rev. 1.00 16 1 9 8 d e b 1 a 1 e 1 e a l b seating plane symbol min max min max inches a 0.145 0.210 3.68 5.33 a 1 0.015 0.070 0.38 1.78 a 2 0.115 0.195 2.92 4.95 b 0.014 0.024 0.36 0.56 b 1 0.030 0.070 0.76 1.78 c 0.008 0.014 0.20 0.38 d 0.745 0.840 18.92 21.34 e 0.300 0.325 7.62 8.26 e 1 0.240 0.280 6.10 7.11 e 0.100 bsc 2.54 bsc e a 0.300 bsc 7.62 bsc e b 0.310 0.430 7.87 10.92 l 0.115 0.160 2.92 4.06 a 0 15 0 15 millimeters a a 2 c note: the control dimension is the inch column e b e a
XR-T6164A 9 rev.1.00 symbol min max min max a 0.093 0.104 2.35 2.65 a 1 0.004 0.012 0.10 0.30 b 0.013 0.020 0.33 0.51 c 0.009 0.013 0.23 0.32 d 0.398 0.413 10.10 10.50 e 0.291 0.299 7.40 7.60 e 0.050 bsc 1.27 bsc h 0.394 0.419 10.00 10.65 l 0.016 0.050 0.40 1.27 a 0 8 0 8 inches millimeters 16 lead small outline (300 mil jedec soic) rev. 1.00 e 16 9 8 d e h b a l c a 1 seating plane a note: the control dimension is the millimeter column 1
XR-T6164A 10 rev. 1.00 notes
XR-T6164A 11 rev.1.00 notes
XR-T6164A 12 rev. 1.00 notice exar corporation reserves the right to make changes to the products contained in this publication in order to im- prove design, performance or reliability. exar corporation assumes no responsibility for the use of any circuits de- scribed herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. charts and schedules contained here in are only for illustration purposes and may vary depending upon a user's specific application. while the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. exar corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. products are not authorized for use in such applications unless exar corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of exar corporation is adequately protected under the circum- stances. copyright 1997 exar corporation datasheet june 1997 reproduction, in part or whole, without the prior written consent of exar corporation is prohibited.

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