XRT5793IV

XR-T5793 ...the analog plus Quad E1 Line Interface Unit company TM June 1997-3
Individual Channel Loss of Signal Detection, Local and Remote Digital Loopback FEATURES
Meets CCITT G.703 Pulse Mask Template for 2.048Mbps (E1) Rates
Low Power, CMOS Technology
Over-Temperature Protection
Transmitter and Receiver Interfaces Can Be: – Single Ended, 75Ω Capacitive or Transformer Coupled APPLICATIONS – Balanced, 100Ω or 120Ω Transformer Coupled
Multi-Line E1 Interface Cards
Minimum Return Loss is 20dB (Receive) and 18dB (Transmit), Exceeds G.703 and ETSI 300 166 Specifications
E1 Network Equipment – Multiplexers – Cross Connects – Switching Systems
Bipolar Outputs Can Be Disabled Individually (High Z Outputs)
Fault Tolerant Systems
System Interface is TTL Compatible on Digital Input and TTL/CMOS Compatible on Digital Output Pins GENERAL DESCRIPTION sensitivity of 600mV over the operating temperature range. Return loss on the receive interfaces is minimum 20dB from 51kHz to 3.072MHz. The XR-T5793 is an optimized line interface unit, built using low power CMOS technology. This device contains four independent E1 channels for primary rate, PCM applications up to 2.048Mbps. Each channel performs the driver and receiver functions necessary to convert bipolar signals to TTL/CMOS compatible logic levels and vice versa. The device supports single ended or balanced line interfaces on each channel, thereby providing the user an option of reducing system cost and board space by replacing the transformer with a capacitor. Local and remote loopbacks can be performed on any of the four channels. A separate loss of signal (LOS) detection circuitry and a LOS pin is provided for each input. The XR-T5793 is targeted for multi-line E1 line card applications where real estate and low power consumption are critical. Also, the device may be used in T1 applications (1.544Mbps) which do not require meeting the DSX-1 cross connect pulse template. The XR-T5793 is pin compatible with the XR-T5794, which supports a fifth channel. The fifth channel is for redundancy and dedicated monitoring on any of the eight bipolar paths. Each of the four drivers can be independently disabled, allowing maximum flexibility in system power management. Output pulses are fully CCITT G.703 compliant. Moreover, the return loss is at least 18dB over a frequency range of 51kHz to 3.072MHz. The slicing circuit in the receive path is able to tolerate a maximum of 12dB of cable loss with a minimum input ORDERING INFORMATION Part No. Package Operating Temperature Range XR-T5793IJ 68 Lead PLCC -40°C to +85°C XR-T5793IV 80 Lead TQFP (14 x 14 x 1.4 mm) -40°C to +85°C Rev. 2.00 1995 EXAR Corporation, 48720 Kato Road, Fremont, CA 94538  (510) 668-7000  FAX (510) 668-7017 1 XR-T5793 BLOCK DIAGRAM Transceiver 1 Transceiver 2 75Ω Unbalanced (Without Transformer) TIP Transceiver 3 0.1µF Impedance Selectable Receivers. Return Loss Exceeds G7.03. Slicer RXIN 100 or 120 PE-65834 TTI-7148 Peak Detector Slice Voltage E1/T1- LOS Threshold Based on G.775 LOOPSEL (1.0) LOOPEN LPMOD TXOUT TIP 120Ω,100Ω or 75Ω Balanced TX OUTPUT RING Rout1 TXEN PE-65839 TTI-7149 75Ω Unbalanced TIP (Without Transformer) LOS Level Detector TIP 120Ω Balanced (or 100Ω ) RX INPUT RING Impedance Selectable Tristate Drivers Return Loss Exceeds ETSI 300 166 Transceiver 4 75 0.1µF Driver L o c a l / R e m o t e L o o p b a c k RXPOS RXNEG TXPOS TXNEG TCLK ROUT1 Note 1R OUT = 68Ω for 120Ω line impedance, ROUT = 62Ω for 100Ω line impedance, ROUT = 68Ω for 75Ω line impedance Figure 1. Block Diagram Rev. 2.00 2 XR-T5793 9 NC AVDD TXCLK4 TXPOS4 TXNEG4 TXCLK3 TXPOS3 TXNEG3 LOOPEN4 LOOPEN3 GND VDD RXPOS3 RXNEG3 RXPOS4 RXNEG4 RVDD SS SS SS TXEN3 TXEN4 TXOUT4 TVDD TV TXOUT3 AGND TV DD NC TV AGND TXOUT2 TV TVDD TXOUT1 TXEN1 TXEN2 PIN CONFIGURATION 1 10 61 60 26 44 43 LPMOD4 LPMOD3 RXIN4 LOS4 LOS3 RXIN3 NC NC RGND RGND NC RXIN2 LOS1 LOS2 RXIN1 LPMOD2 LPMOD1 27 LOSLVS AVSS TXCLK2 TXPOS2 TXNEG2 TXCLK1 TXPOS1 TXNEG1 LOOPEN2 LOOPEN1 E1/T1– VSS RXPOS2 RXNEG2 RXPOS1 RXNEG1 RVSS LOSLVS AVSS AVSS AVSS TXCLK2 TXPOS2 TXNEG2 TXCLK1 TXPOS1 TXNEG1 LOOPEN2 LOOPEN1 E1/T1VSS RXPOS2 RXNEG2 RXPOS1 RXNEG1 RVSS RVSS 68 Lead PLCC 60 NC NC TXEN2 TXEN1 TXOUT1 TVDD TVSS TXOUT2 AGND TVSS NC TVDD AGND TXOUT3 TVSS TVDD TXOUT4 TXEN4 TXEN3 NC 41 61 40 80 21 20 NC NC AVDD AVDD TXCLK4 TXPOS4 TXNEG4 TXCLK3 TXPOS3 TXNEG3 LOOPEN4 LOOPEN3 GND V DD RXPOS3 RXNEG3 RXPOS4 RXNEG4 RVDD RV DD 1 80 Lead TQFP (14 x 14 x 1.4 mm) Rev. 2.00 3 NC NC LPMOD1 LPMOD2 RXIN1 LOS2 LOS1 RXIN2 NC RGND RGND RGND NC NC RXIN3 LOS3 LOS4 RXIN4 LPMOD3 LPMOD4 XR-T5793 PIN DESCRIPTION PLCC Pin # SQFP Pin # Symbol 1 71 NC 2 72 TVDD VDD Transmit VDD. 5V (
5%). 3 73 AGND GND Analog Ground. 4 74 TXOUT3 O 5 75 TVSS VSS Transmit VSS. -5V (
5%). 6 76 TVDD VDD Transmit VDD. +5V (
5%). 7 77 TXOUT4 O Transmitter 4 Output. Transmitter 4 bipolar output connected to coupling capacitor or pulse transformer by a resistor. 8 78 TXEN4 I Transmitter 4 Output Enable. If driven high the transmitter 4 output drivers are enabled. Hi-Z otherwise. 9 79 TXEN3 I Transmitter 3 Output Enable. If driven high the transmitter 3 output drivers are enabled. Hi-Z otherwise. 10 1, 2, 80 NC NC No Connect. 11 3,4 AVDD VDD Analog VDD. 12 5 TXCLK4 I Transmitter 4 Clock Input. Apply logic one when RZ signals are supplied to data inputs. 13 6 TXPOS4 I Transmitter 4 Positive Data In. Positive data input in NRZ or RZ format for transmitter 4. 14 7 TXNEG4 I Transmitter 4 Negative Data In. Negative data input in NRZ or RZ format for transmitter 4. 15 8 TXCLK3 I Transmitter 3 Clock Input. Apply logic one when RZ signals are supplied to data inputs. 16 9 TXPOS3 I Transmitter 3 Positive Data in. Positive data input in NRZ or RZ format for transmitter 3. 17 10 TXNEG3 I Transmitter 3 Negative Data In. Negative data input in NRZ or RZ format for transmitter 3. 18 11 LOOPEN4 I Loop Enable 4. If driven high the specified loop type will be enabled for channel 4. Otherwise normal operation will continue. 19 12 LOOPEN3 I Loop Enable 3. If driven high the specified loop type will be enabled for channel 3. Otherwise normal operation will continue. 20 13 GND GND Digital Ground. 21 14 VDD VDD Digital VDD. +5V (
5%). 22 15 RXPOS3 O Receiver 3 Positive Data Out. Positive data output in NRZ or RZ format for receiver 3. 23 16 RXNEG3 O Receiver 3 Positive Data Out. Negative data output in NRZ or RZ format for receiver 3. 24 17 RXPOS4 O Receiver 4 Positive Data Out. Positive data output in NRZ or RZ format for receiver 4. 25 18 RXNEG4 O Receiver 4 Positive Data Out. Negative data output in NRZ or RZ format for receiver 4. 26 19,20 RVDD VDD Type Description No Connect. Transmitter 3 Output. Transmitter 3 bipolar output connected to coupling capacitor or pulse transformer by a resistor. Receive VDD. +5V (
5%). Rev. 2.00 4 XR-T5793 PIN DESCRIPTION (CONT’D) PLCC Pin # SQFP Pin # Symbol Type 27 21 LPMOD4 I Loop Mode 4. If driven high the loopback mode of channel 4 will be set to remote loop. Otherwise theloopback mode will remain at local loop. The actualloopback will be activated when the LOOPEN4 is asserted. 28 22 LPMOD3 I Loop Mode 3. If driven high the loopback mode of channel 3 will be set to remote loop. Otherwise the loopback mode will remain at local loop. The actual loopback will be activated when the LOOPEN3 is asserted. 29 23 RXIN4 I Receiver 4 Input. Receiver 4 bipolar input connected to coupling capacitor or pulse transformer. 30 24 LOS4 O Receiver 4 Loss of Signal. Asserted during LOS condition. Clear otherwise. 31 25 LOS3 O Receiver 3 Loss of Signal. Asserted during LOS condition. Clear otherwise. 32 26 RXIN3 I Receiver 3 Input. Receiver 3 bipolar input connected to coupling capacitor or pulse transformer. 33 27 NC No Connect. 34 28 NC No Connect. 35 29, 30 RGND GND Receive Ground. 36 31 RGND GND Receive Ground. 37 32 NC 38 33 RXIN2 I Receiver 2 Input. Receiver 2 bipolar input connected to coupling capacitor or pulse transformer. 39 34 LOS1 O Receiver 1 Loss of Signal. Asserted during LOS condition. Clear otherwise. 40 35 LOS2 O Receiver 2 Loss of Signal. Asserted during LOS condition. Clear otherwise. 41 36 RXIN1 I Receiver 1 Input. Receiver 1 bipolar input connected to coupling capacitor or pulse transformer. 42 37 LPMOD2 I Loop Mode 2. If driven high the loopback mode of channel 2 will be set to remote loop. Otherwise the loopback mode will remain at local loop. The actual loopback will be activated when the LOOPEN2 is asserted. 43 38 LPMOD1 I Loop Mode 1. If driven high the loopback mode of channel 1 will be set to remote loop. Otherwise the loopback mode will remain at local loop. The actual loopback will be activated when the LOOPEN1 is asserted. - 39, 40 NC NC No Connect. 44 41,42 RVSS VSS Receive VSS. -5V (
5%). 45 43 RXNEG1 O Receiver 1 Negative Data Out. Negative data output in NRZ or RZ format for receiver 1. 46 44 RXPOS1 O Receiver 1 Positive Data Out. Positive data output in NRZ or RZ format for receiver 1. 47 45 RXNEG2 O Receiver 2 Negative Data Out. Negative data output in NRZ or RZ format for receiver 2. 48 46 RXPOS2 O Receiver 2 Positive Data Out. Positive data output in NRZ or RZ format for receiver 2. 49 47 VSS VSS 50 48 E1/T1- I Description No Connect. Digital VSS. -5V (
5%). E1/T1- Selection. Apply logic one to select the receive data threshold appropriate for E1 operation. Connect to ground to select the T1 data threshold. Rev. 2.00 5 XR-T5793 PIN DESCRIPTION (CONT’D) PLCC Pin # SQFP Pin # Symbol Type 51 49 LOOPEN1 I Loop Enable 1. If driven high the specified loopback mode will be enabled for channel 1. Otherwise normal operation will continue. 52 50 LOOPEN2 I Loop Enable 2. If driven high the specified loopback mode will be enabled for channel 2. Otherwise normal operation will continue. 53 51 TXNEG1 I Transmitter 1 Negative Data In. Negative data input in NRZ or RZ format for transmitter 1. 54 52 TXPOS1 I Transmitter 1 Positive Data In. Positive data input in NRZ or RZ format for transmitter 1. 55 53 TXCLK1 I Transmitter 1 Clock Input. Apply logic one when RZ signals are supplied to data inputs. 56 54 TXNEG2 I Transmitter 2 Negative Data In. Negative data input in NRZ or RZ format for transmitter 2. 57 55 TXPOS2 I Transmitter 2 Positive Data In. Positive data input in NRZ or RZ format for transmitter 2. 58 56 TXCLK2 I Transmitter 2 Clock Input. Apply logic one when RZ signals are supplied to data inputs. 59 57,58,59 AVSS VSS 60 60 LOSLVS I Description Analog VSS. Loss of Signal Voltage Select. Apply logic one to select LOS voltage level appropriate for 120Ω balanced receiver operation. Connect to ground to choose LOS voltage for 75Ω unbalanced operation. - 61, 62 NC NC 61 63 TXEN2 I No Charge. Transmitter 2 Output Enable. If asserted the transmitter 2 output drivers are enabled. High-Z otherwise. 62 64 TXEN1 I Transmitter 1 Output Enable. If asserted the transmitter 1 output drivers are enabled. High-Z otherwise. 63 65 TXOUT1 O Transmitter 1 Output. Transmitter 1 bipolar output connected to coupling capacitor or pulse transformer through a resistor. 64 66 TVDD VDD Transmit VDD. +5V (
5%). 65 67 TVSS VSS Transmit VSS. -5V (
5%). 66 68 TXOUT2 O 67 69 AGND GND Analog Ground. 68 70 TVSS VSS Transmit VSS. –5V (
5%). Transmitter 2 Output. Transmitter 2 bipolar output connected to coupling capacitor or pulse transformer through a resistor. Rev. 2.00 6 XR-T5793 DC ELECTRICAL CHARACTERISTICS Test Conditions: TA = -40°C to 25°C to 85°C, all VDDs = 5V
5%, all VSSs = -5V
5%, all GNDs = 0V Symbol Parameter Min. Typ. Max. Unit Conditions DC Parameters VDDs DC Supply Positive 4.75 5.00 5.25 V VSSs DC Supply Negative -4.75 -5.00 -5.25 V Inputs VIH High Level Input VIL Low Level Input 0.8 V Input Pull Down Current 40 µA IPDC 2.0 V Outputs VOH High Level Output 3.5 V IOH = -10µA VOH High Level Output 2.4 V IOH = -40µA VOL Low Level Output 0.4 V IOL = 1.6mA Receiver Specifications RXP Receiver Sensitivity 0.6 4.2 Vp RXCL Allowed Cable Loss 0 10 12 dB 1.024MHz (E1) (0dB=2.4V) 0 10 12 dB 772kHz (T1) dB with 6dB cable loss RXIWT RXTI RXEI RXLOS RIN Interference Margin (E1) 16 Receiver Slicing Level (T1)1 60 65 70 % Peak Voltage % Receiver Slicing Level (E1)1 45 50 55 % Peak Voltage % 0.2 0.3 V Receiver LOS Threshold Input Resistance 2.5 kΩ Up to 3.072MHz Power Specifications (Without Monitor Channel) PD Power Dissipation PD Power Dissipation PC PC PC 400 680 mW 250 280 mW All Drivers in High-Z Power Consumption 75Ω2 500 833 mW All 1’s Transmit & Receive Power Consumption 100Ω2 475 860 mW All 1’s Transmit & Receive Power Consumption 120Ω2 450 830 mW All 1’s Transmit & Receive PVDD Power Supply Requirement Pc/2 +5mW mW Pvss Power Supply Requirement Pc/2 - 5mW mW Notes 1 Selected by E1/T12 Power consumption = power dissipation + power to the cable. Bold face parameters are covered by production test and guaranteed over operating temperature range. Specifications are subject to change without notice Rev. 2.00 7 XR-T5793 AC ELECTRICAL CHARACTERISTICS Test Conditions: TA = -40°C to 25°C to 85°C, all VDDs = 5V
5%, all VSSs = -5V
5%, all GNDs = 0V Symbol Parameter Min. Typ. Max. Unit Conditions AC PARAMETERS VTXOUT Output Pulse Amplitude (75Ω) 2.13 2.37 2.60 V VTXOUT Output Pulse Amplitude (120Ω) 2.70 3.0 3.30 V VTXOUT Output Pulse Amplitude (100Ω) 2.3 3.0 3.7 V TXPW Pulse Width (2.048MHz) 224 244 264 ns Determined by TX Clock TXPW Pulse Width (1.544MHz) 274 324 374 ns Determined by TX Clock Pos/neg Pulse Imbalance -5 +5 % T1 TXCLK Clock Period (E1) 488 ns T2 TXCLK Clock Period (T1) 648 ns T3 TXCLK Duty Cycle 48 T4 Data Setup Time, TDATA to TCLK 50 ns T5 Data Hold Time, TCLK to TDATA 50 ns TR Clock Rise Time 30 ns TF Clock Fall Time 30 ns T6 Receive Data High (E1) 269 ns T7 Data Propagation Delay  100 ns T 1  100 T2 ns 219 50 52 244 T1 T2 T8 Data Propagation Delay % 0dB Cable Loss Specifications are subject to change without notice ABSOLUTE MAXIMUM RATINGS Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7V Storage Temperature . . . . . . . . . . . . -65°C to +150°C Operating Temperature . . . . . . . . . . . . -40°C to +85°C Rev. 2.00 8 XR-T5793 T1 or TF T3 T3 TR TXCLK(n) T4 T5 TF TXPOS(n) TXNEG(n) Figure 2. Transmit Timing Diagram T7 T6 TR RXIN RXPOS TF T8 TF RXNEG T6 Figure 3. Receive Timing Diagram Rev. 2.00 9 TR XR-T5793 Transmit Interface 75Ω 100Ω 120Ω Min. Typ. Min. Typ. Min. Typ. Units 51kHz to 102kHz 18 22 18 22 18 22 dB 102kHz to 2.048MHz 18 22 18 22 18 22 dB 2.048MHz to 3.072MHz 18 22 18 22 18 22 dB Receive Interface 75Ω 100Ω 120Ω Min. Typ. Min. Typ. Min. Typ. Units 51kHz to 102kHz 20 30 20 30 20 30 dB 102kHz to 2.048MHz 20 30 20 30 20 30 dB 2.048MHz to 3.072MHz 20 30 20 30 20 30 dB Note The return loss has been measured on the evaluation board coupled via a capacitor and terminated with 75Ω impedance. Table 1. Return Loss Requirements (Resistor Tolerance: 1% on Transmit Side, 2% on Receive Side) Turns Ratio Line Impedance RLOAD Turns Ratio Line Impedance ROUT 1:1 75Ω 75Ω 1:1 75Ω 68Ω 1:1 120Ω 120Ω 1:1.265 120Ω 68Ω 1:1 100Ω 100Ω 1:1.265 100Ω 62Ω Table 2. Input Transformer Requirements Table 3. Output Transformer Requirements 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. 2.00 10 XR-T5793 driver. External resistors are used to maintain an accurate source impedance that has a high return loss to the transformer or the capacitor. Each of the drivers can be individually disabled, this is required in fault tolerant applications where redundancy is a requirement. During power-down mode of operation the bipolar outputs can be disabled. SYSTEM DESCRIPTION This device is a quad E1 transceiver which provides electrical interface for 2.048Mbps applications. Its unique architecture includes four receiver circuits that convert CCITT G.703 compliant bipolar signals to TTL compatible logic levels. Likewise, in the other direction, four transmitters translate TTL compatible logic levels to G.703 compatible bipolar signals. To protect the data integrity during a brownout, the output pulse amplitudes are reduced by a factor of 25% if the supply drops below an internally set limit. This device supports two different types of loopback functions. Each of four channels can be independently looped either in local or remote sides digitally. The remote loopback is performed between the receiver input and transmitter output. To activate the remote loopback on channel n, LOOPENn and LPMODn inputs are driven high. Local loopback on channel n, can be established similarly by driving LOOPENn high and clearing LPMODn inputs. More than one channel can be tested simultaneously. Transmission is possible either with or without a clock. If a clock is used, the transmit input data must consist of full-width NRZ pulses, and the transmitter output pulse width is determined by the duty cycle of the clock. If the transmit clock is tied high, the transmitter output pulses are determined by the input data pulse width. In this mode, RZ data must be supplied to the device. RECEIVERS TXP TXN Each of the four identical E1 line receivers will accept bipolar signals meeting the CCITT G.703 pulse mask requirements. Each input stage consists of a slicing circuitry which samples the incoming pulses at a fixed percentage of the signals maximum amplitude. The slicing voltage level is generated using a precision peak detector. The receiver section can tolerate up to 12dB of line loss (measured at 1.024MHz). RXIN RX TX TXOUT LPMOD=0 LPEN=1 RXP RXN Remote Loopback TXP TXN A loss of signal (LOS) is detected on any inputs by input fail circuitry. There is an independent LOS pin dedicated for each of the receivers. The LOS detection is based on signal energy instead of number of zeros. RXIN RX TX LPMOD=0 LPEN=1 A balanced signal (100Ω or 120Ω) must be coupled by a transformer. An unbalanced signal (75Ω) may be coupled via capacitor or a transformer. RXP RXN Local Loopback Figure 4. Loopback Configurations TRANSMITTERS This device contains four identical CCITT G.703 compliant transmitters which meet the return loss requirements. Each transmitter is a single-ended voltage Rev. 2.00 11 TXOUT XR-T5793 Output Transformer Selection 3. The 1:1.265 ratio output transformer is recommended for the XR-T5793 because this ratio gives the best possible transmitter output return loss for 120Ω balanced E1 service. However, other transformers may provide an adequate return loss for many applications. The two characteristics that determine series build-out resistor requirements are: R S + Req 4. ǒVV S eq *1 Ǔ Now calculate the theoretical return loss. Return Loss + 20 log
Driver output impedance is less than 5Ω. )R ǒReq Ǔ Req * R S S
Vs, which is the driver open circuit output voltage, is 4.5V peak. The calculation given below uses the recommended 1:1.265 ratio transformer as an example: The following method may be used to determine transformer suitability for a given use. 1. Calculate the source resistance, Rs. Transformer Ratio = 1:1.265 VO = 3.0V Peak RL = 120Ω List the application requirements. Transformer ratio = 1:n VO = Peak output pulse amplitude RL = Load resistance Req + RL + 120 + 75Ω 1.6 n2 Rs 1:n V Veq + no + 3.0 + 2.37V 1.265 1 3 VO Vs 4 RL 2 Rs + Req Figure 5. Equivalent Impedance Schematic 2. V ǒVeq * 1 Ǔ + 75 ǒ 4.5 * 1 Ǔ + 67.4Ω 2.37 S Calculate equivalent output voltage and load resistance without the transformer. R eq R + 2L n V eq (Datasheet specifies standard value of 68Ω) Calculate the theoretical return loss to determine if the transformer is acceptable. V + nO ǒ Vs Ǔ Return Loss + 20 log 75 ) 67.4 + 25.5dB 75 * 67.4 Rs Req Veq Figure 6. Equivalent Simplified Schematic Rev. 2.00 12 XR-T5793 269 ns (244 + 25) Nominal pulse 20% 10% V = 100% 194 ns (244 – 50) 10% 20% 50% 244 ns 219 ns (244 – 25) 10% 10% 0% 10% 20% 488 ns (244 + 244) Note: V corresponds to the nominal peak value Figure 7. CCITT G.703 Pulse Template Rev. 2.00 13 10% XR-T5793 68 LEAD PLASTIC LEADED CHIP CARRIER (PLCC) Rev. 1.00 D C Seating Plane D1 45° x H1 A2 45° x H2 2 1 68 B1 B D D2 D3 D1 e R D3 A1 A INCHES SYMBOL MILLIMETERS MIN MAX MIN MAX A 0.165 0.200 4.19 5.08 A1 0.090 0.130 2.29 3.30 A2 0.020 ---. 0.51 --- B 0.013 0.021 0.33 0.53 B1 0.026 0.032 0.66 0.81 C 0.008 0.013 0.19 0.32 D 0.985 0.995 25.02 25.27 D1 0.950 0.958 24.13 24.33 D2 0.890 0.930 22.61 23.62 D3 e 0.800 typ. 0.050 BSC 20.32 typ. 1.27 BSC H1 0.042 0.056 1.07 1.42 H2 0.042 0.048 1.07 1.22 R 0.025 0.045 0.64 1.14 Note: The control dimension is the inch column Rev. 2.00 14 XR-T5793 80 LEAD THIN QUAD FLAT PACK (14 x 14 x 1.4 mm, TQFP) Rev. 3.00 D D1 60 41 61 40 D1 80 21 1 20 A2 B e C A Seating Plane α A1 L INCHES SYMBOL A A1 A2 B C D D1 e L α MIN MILLIMETERS MAX MIN 0.055 0.063 0.002 0.006 0.053 0.057 0.009 0.015 0.004 0.008 0.622 0.638 0.547 0.555 0.0256 BSC 0.018 0.030 1.40 0.05 1.35 0.22 0.09 15.80 13.90 0° 7° 1.60 0.15 1.45 0.38 0.20 16.20 14.10 0.65 BSC 0.45 0.75 0° Note: The control dimension is the millimeter column Rev. 2.00 15 MAX 7° D XR-T5793 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 herein 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 1995 EXAR Corporation Datasheet June 1997 Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited. Rev. 2.00 16