XR-T6164 ...the analog plus company TM Digital Line Interface Transceiver June 1997–3 APPLICATIONS FEATURES Data Adaption Unit (DAU) Single 5V Supply CCITT G.703 Compatible When Used With Either XR-T6165 or XR-T6166 Low Power TTL Compatible Digital Inputs and Outputs Links Remote Equipment at Distances up to 500 Meters Without Equalization Receive Data Comparator Threshold Storage Provides Ping-Pong Operation Capability Loss of Signal Alarm Dual Matched Driver Outputs General Purpose TTL Compatible Line Interface GENERAL DESCRIPTION The XR-T6164 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-T6164CP 16 Lead 300 Mil PDIP 0°C to +70°C XR-T6164CD 16 Lead 300 Mil JEDEC SOIC 0°C to +70°C Rev. 2.02 1990 EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 (510) 668-7000 FAX (510) 668-7017 1 XR-T6164 BLOCK DIAGRAM PEAK CAP Positive Data Comparator 14 + RX+I/P - 16 Peak Detector RX-I/P 12 S+R 5 S-R 3 RX ALARM 2 I/P BIAS TTL Buffer Threshold Generator 1 + - TCM CON 15 Negative Data Comparator TCM Control TTL Buffer TTL Buffer VCCA 13 GNDA 4 TX+I/P 11 10 TX+O/P TX-I/P 6 8 TX-O/P Bias VCCD 9 GNDD 7 Open Collector Driver Open Collector Driver Figure 1. XR-T6164 Block Diagram Rev. 2.02 2 XR-T6164 PIN CONFIGURATION RX-I/P I/P BIAS RX ALARM GNDA S-R TX-I/P GNDD TX-O/P 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 RX+I/P TCM CON PEAK CAP VCCA S+R TX+I/P TX+O/P VCCD RX-I/P I/P BIAS RX ALARM GNDA S-R TX-I/P GNDD TX-O/P 16 Lead PDIP (0.300”) 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 RX+I/P TCM CON PEAK CAP VCCA S+R TX+I/P TX+O/P VCCD 16 Lead SOIC (Jedec, 0.300”) 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 8 TX-O/P 9 VCCD 10 TX+O/P Digital Ground. O Transmit Negative Output Driver. Open collector, drives output transformer primary. +5V5% Digital Supply. 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 VCCA 14 PEAK CAP 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. +5V5% Analog Supply. Peak Detector Capacitor. Stores peak detector voltage. Rev. 2.02 3 XR-T6164 ELECTRICAL CHARACTERISTICS Test Conditions: VCC = 5V 5%, TA = 25°C, Unless Otherwise Specified Parameters Min. Typ. Max. Units 4.75 5 5.25 V Conditions DC Electrical Characteristics Supply Voltage Analog Supply Current 4 8 mA Digital Supply Current 13 20 mA 2.2 Vp Measured from Pins 1 or 16 with Respect to Pin 2 10 dB Maximum Cable Loss Range Receiver Input Signal 1 Dynamic Range Input Impedance 20 kΩ Measured Between Pins 1 And 16 Input Slicing Threshold 50 % Percent of Peak Input Signal Amplitude 1.45 V Measured at Pin 2 150 mVp 1.5 dB Input Bias Voltage Loss of Signal Alarm Threshold Loss of Signal Alarm Level Hysteresis Peak Detector Leakage Data Output High 0.4 Alarm Output High V Measured at Pins 5 or 12, IOUT = +1.6mA V Measured at Pins 5 or 12, IOUT = -40µA V Measured at Pin 3; IOUT = +1.6mA V Measured at Pin 3; IOUT = -40µA 0.8 V Measured at Pin 15; IIN Min = -500µA, IIN Max = +5µA 0.8 V Measured at Pins 6, 11; IIN = -700µA V Measured at Pins 6, 11; IIN = +5µA Measured at Pins 8, 10; IOUT = -40mA 3.6 Alarm Output Low 0.4 VCC 0.5 TCM Input Low Voltage Difference Between Alarm-on and Alarm-off Levels µA -80 Data Output Low Measured from Pins 1 or 16 with Respect to Pin 2 Transmitter Input Low Voltage Input High Voltage 2.2 Output Low Voltage 1 V Output Low Current 40 mA Measured at Pins 8, 10; VOUT = 1V µA Measured at Pins 8, 10; VOUT = 10V Outputs in off state 2.2 Vp Pin 1, 16 with Respect to Pin 21 Output Rise Time 50 ns Pins 5, 12; CL = 15pF, 10% to 90% Output Fall Time 50 ns Pins 5, 12; CL =15pF, 90% to 10% Output Leakage Current -100 AC Electrical Characteristics Receiver Input Level 1 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. Rev. 2.02 4 XR-T6164 ELECTRICAL CHARACTERISTIC (CONT’D) Parameters Min. Typ. Max. Units Conditions Output Rise Time 50 ns Pins 8, 10; RL = 130, CL = 15pF, 10% to 90% Output Fall Time 50 ns Pins 8, 10; RL = 130, CL = 15pF, 90% to 10% Rising Edge Delay 100 ns Pins 8, 10; RL = 130, CL = 15pF, 50% to 50% (I/P to O/P) Falling Edge Delay 100 ns Pins 8, 10; RL = 130, CL = 15pF, 50% to 50% (I/P to O/P) AC Electrical Characteristics (Cont’d) Transmitter 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: Transpower Technologies, Inc. 24 Highway 28, Suite 202 Crystal Bay, NV 89402–0187 Tel. (702) 831–0140 Fax. (702) 831–3521 Pulse Telecom Product Group P.O. Box 12235 San Diego, CA 92112 Tel. (619) 674-8100 Fax. (619) 674-8262 Rev. 2.02 5 XR-T6164 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. SYSTEM DESCRIPTION The XR-T6164 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. Transmitter Receiver The XR-T6164 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. The XR-T6164 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. APPLICATION INFORMATION Figure 2 shows a general line driver application circuit using the XR-T6164. 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-T6164 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 TTI–7147 for 64Kbps use and the PE-65835 for 1.544Mbps applications. 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. 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. 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 Rev. 2.02 6 XR-T6164 +5V 0.1µF 0.1µF 16 1:2 TIP Receive Input 9 13 VCCA VCCD RX+I/P 480 1 RING 2 PE-65535 TTI-7147 14 0.1µF XR-T6164 RX-I/P I/P BIAS S-R RX ALARM PEAK CAP 0.1µF TCM CON +5V 300 1:2 TIP Transmit Output 300 RING PE-65535 TTI-7147 S+R 10 8 TX+O/P TX-O/P TX+I/P GNDA GNDD 0.1µF 4 TX-I/P 12 5 3 15 11 6 7 Figure 2. XR-T6164 Line Driver Application Rev. 2.02 7 RXDATA+ RXDATARX ALARM TCM CON TX DATA+ TX DATA- XR-T6164 16 LEAD PLASTIC DUAL-IN-LINE (300 MIL PDIP) Rev. 1.00 16 9 1 8 E1 E D A2 Seating Plane A L α A1 B MILLIMETERS INCHES SYMBOL eA eB B1 e MIN MAX MIN MAX A 0.145 0.210 3.68 5.33 A1 0.015 0.070 0.38 1.78 A2 0.115 0.195 2.92 4.95 B 0.014 0.024 0.36 0.56 B1 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 E1 0.240 0.280 6.10 7.11 e eA 0.100 BSC 2.54 BSC 0.300 BSC 7.62 BSC eB 0.310 0.430 7.87 10.92 L 0.115 0.160 2.92 4.06 α 0° 15° 0° 15° Note: The control dimension is the inch column Rev. 2.02 8 C XR-T6164 16 LEAD SMALL OUTLINE (300 MIL JEDEC SOIC) Rev. 1.00 D 16 9 E H 1 8 C A Seating Plane e B α A1 L INCHES SYMBOL MILLIMETERS MIN MAX MIN A 0.093 0.104 2.35 2.65 A1 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 MAX 1.27 BSC H 0.394 0.419 10.00 10.65 L 0.016 0.050 0.40 1.27 α 0° 8° 0° 8° Note: The control dimension is the millimeter column Rev. 2.02 9 XR-T6164 Notes Rev. 2.02 10 XR-T6164 Notes Rev. 2.02 11 XR-T6164 NOTICE EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described 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 circumstances. Copyright 1990 EXAR Corporation Datasheet June 1997 Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited. Rev. 2.02 12