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Advisory July 1998
LH1465AB/AAE ISDN dc Termination IC Data Sheet Advisory
Application Circuit
Replace Figure 11 on page 10 of the LH1465AB/AAE data sheet with the figure shown below.
MLT CIRCUIT
C15 1.0 F R11 137
(PLACE THIS CAPACITOR AS CLOSE AS POSSIBLE TO THE LH1465) LH1465AB 8 TC PR+ 7 RS T U3 6 PD R 5 COM PR- R14 1.1 k 2W
+5 V R10 10 k 8 6 5 R9
R8 17.8 k SCNT1 OPTOIN PIN
U2
R12 137 2 3 CA 1.0 F ZD
1 2 3 4
R15 1.1 k 2W RING TIP
7
HCPL-0701
2.2 M
FOR NORTH AMERICAN APPLICATIONS ONLY
5-7034(C)
Figure 1. MLT Circuit Showing New Placement of Zener Diode (ZD) and Capacitor (CA) In the ILOSS mode (refer to ANSI T1.601 1992, Section 6.5.2), the NT generates a scrambled, framed, 2B1Q signal such as SN1 and SN2. When the ILOSS mode is applied to circuits with the LH1465, it was observed that for some short loop lengths, the NT, once in the ILOSS mode, would not respond to further maintenance pulses until the ILOSS timer expired. It was discovered that there is some portion of the transmitted 2B1Q signal from the NT that passes through the LH1465 to the optoisolator. This causes the optoisolator to report incorrect dial pulses at its output, and thus prevent the NT from properly exiting the ILOSS mode. To correct this situation, the dropout voltage (voltage at the Tip/Ring needed to turn on the optoisolator) of the optoisolator driver on the LH1465 is raised using the 3.6 V zener diode ZD (for example, Motorola* MMSZ4685T1). Capacitor CA is a 1.0 F 10% tantalum chip capacitor, with a voltage rating of at least 16 V. CA is added to provide a level of filtering for the transition points (turn-on or turn-off) of the optoisolator input voltage, which increases the robustness of the circuit.
* Motorola is a registered trademark of Motorola Inc.
For additional information, contact your Microelectronics Group Account Manager or the following: http://www.lucent.com/micro INTERNET: docmaster@micro.lucent.com E-MAIL: N. AMERICA: Microelectronics Group, Lucent Technologies Inc., 555 Union Boulevard, Room 30L-15P-BA, Allentown, PA 18103 1-800-372-2447, FAX 610-712-4106 (In CANADA: 1-800-553-2448, FAX 610-712-4106) ASIA PACIFIC: Microelectronics Group, Lucent Technologies Singapore Pte. Ltd., 77 Science Park Drive, #03-18 Cintech III, Singapore 118256 Tel. (65) 778 8833, FAX (65) 777 7495 CHINA: Microelectronics Group, Lucent Technologies (China) Co., Ltd., A-F2, 23/F, Zao Fong Universe Building, 1800 Zhong Shan Xi Road, Shanghai 200233 P R. China Tel. (86) 21 6440 0468, ext. 316, FAX (86) 21 6440 0652 . JAPAN: Microelectronics Group, Lucent Technologies Japan Ltd., 7-18, Higashi-Gotanda 2-chome, Shinagawa-ku, Tokyo 141, Japan Tel. (81) 3 5421 1600, FAX (81) 3 5421 1700 EUROPE: Data Requests: MICROELECTRONICS GROUP DATALINE: Tel. (44) 1189 324 299, FAX (44) 1189 328 148 Technical Inquiries: GERMANY: (49) 89 95086 0 (Munich), UNITED KINGDOM: (44) 1344 865 900 (Bracknell), FRANCE: (33) 1 48 83 68 00 (Paris), SWEDEN: (46) 8 600 7070 (Stockholm), FINLAND: (358) 9 4354 2800 (Helsinki), ITALY: (39) 2 6601 1800 (Milan), SPAIN: (34) 1 807 1441 (Madrid)
Lucent Technologies Inc. reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application. No rights under any patent accompany the sale of any such product(s) or information.
Copyright (c) 1998 Lucent Technologies Inc. All Rights Reserved Printed in U.S.A.
July 1998 AY98-028ISDN (Replaces AY98-013ISDN) (Must accompany DS97-414ISDN)
Data Sheet February 1998
LH1465AB/AAE ISDN dc Termination IC
Features
s s s s s
Description
The LH1465 ISDN dc Termination IC is used on Uinterface digital subscriber lines (U-DSL) and provides a polarity insensitive dc termination for the loop-sealing current and a recognizable signature for mechanized loop testing (MLT) systems. The LH1465 passes dc signaling information to the NT1 circuitry through a 6N139 optoisolator (or equivalent). The LH1465 IC consists of two functional blocks. The first provides the electronic inductor and silicon-controlled rectifier portion of the termination, while the second drives the LED of the 6N139 optoisolator. Inquire about the availability of tape-and-reel packaging for the 16-pin SOG (LH1465AAE).
ANSI U-DSL compatible High linearity MLT compatible SARTS compatible Portable test set compatible Device Code Package Type 8-Pin, Plastic DIP 16-Pin, Plastic SOG
LH1465AB LH1465AAE
2 1
2.2 k 4 W, 5% 4
6
1 2 3 4
PD1
8 7 6 5
6N139
8 1 F 15 V, 10%
7
3 POLARITY GUARD OPTOISOLATOR DRIVER
68 5 1/4 W, 1% ELECTRONIC INDUCTOR, BREAKOVER, AND LATCH CIRCUITS CURRENT LIMIT AND EXCESS POWER PROTECTION
12-1947(F)
Figure 1. Functional Diagram/8-Pin DIP
LH1465AB/AAE ISDN dc Termination IC
Data Sheet February 1998
1 mA loop current is interrupted for more than 100 ms. See Figures 6, 7, and 8 of this document or Table F1 in Appendix F of ANSI Standard T1.601-1991. Current for the LED is interrupted when loop current is interrupted. The current in the ON state is determined by the battery voltage and loop resistance. Should the loop resistance be negligible and/or applied voltage excessively large, the LH1465 will limit the loop current to less than 60 mA. While in current limit, the LH1465 shunts the 2.2 k, 4 W power resistor R2 across itself to protect against excessive thermal heating. In the event that fault voltages exceeding 100 V are impressed upon TIP and RING, the LH1465 will shut off and go into a standby mode where very little current flows. When the fault voltage is removed, the LH1465 goes back into its normal ON-state operation.
Functional Description
The LH1465 plays a dual role in the ISDN NT1: first, as an electronic inductor for a dc termination with high ac impedance; and second, as part of the dc signaling system for line testing capability. The LH1465 meets or exceeds all specifications for the ISDN NT1 dc termination as described by ANSI Standard T1.601-1991. Use of the LH1465 requires only a few discrete components. See Figure 11 for a typical NT1 application. The LH1465 is current limited, but is not an overvoltage surge protector. A crowbar-type surge protector limiting the line voltage to less than 250 V is recommended to protect the LH1465. The surge protector must withstand the requirements in Tables 4 and 5. One such protector is the Teccor* Inc., P2000AA61 SIDACTOR*. The LH1465 has a polarity guard so that the device gives the same characteristics whether the NT1 TIP or RING terminal is connected to the battery voltage. TIP and RING are connected directly to the LH1465AB terminals 2 and 3 and to the LH1465AAE terminals 4 and 5. The dc T to R I-V characteristics of the LH1465 are shown in Figures 2 and 3. As battery voltage is applied to the loop, the LH1465 conducts current only when the voltage across the LH1465 exceeds about 35 V. With 35 V or more applied to the LH1465A, the device conducts about 150 A of current for about 20 ms and then turns on and goes into the ON state. The LH1465 will remain in the ON state for as long as the loop current exceeds 0.5 mA. The LH1465 has a turn-on and turn-off timing circuit that ensures that the LH1465 will: a) not turn on if a voltage above 43.5 V is applied for less than 3 ms; and b) not turn off if the loop current is interrupted for less than 3 ms. Current for the LED of the optocoupler flows when the current in the LH1465 is greater than 1 mA. However, the LH1465 is guaranteed to turn on if a voltage above 43.5 V is applied for more than 50 ms, and turn off if
Pin Descriptions
DIP SOG 1 2 3 4 5 6 7 8 1 4 5 8 9 12 13 16 2, 3 6, 7 10, 11 14, 15 Symbol PR+ T R PR- COM PD RS TC NC NC NC NC Name/Function Protection resistor positive side Tip side of the loop Ring side of the loop Protection resistor negative side Common Photodiode (LED input current) Current-limit resistor Timing capacitor No connection No connection No connection No connection
* Teccor is a trademark and SIDACTOR is a registered trademark of Teccor, Inc.
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Lucent Technologies Inc.
Data Sheet February 1998
LH1465AB/AAE ISDN dc Termination IC
Absolute Maximum Ratings At 25 C
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess of those indicated in the operations sections of the data sheet. Exposure to absolute maximum ratings for extended periods can adversely affect device reliability. Parameter Ambient Operating Temperature Storage Temperature Power Dissipation Pin Soldering Temperature (t = 15 s) Maximum Voltage (T/R, R/T)* Symbol TA Tstg PD -- -- Min -40 -40 -- -- -- Typ -- -- -- -- -- Max 85 125 1 300 300 Unit C C W C Vdc
* If the SOG package is used, it is recommended to place a drop of RTV (room temperature vulcanizing) compound on the tip and ring pins (pins 3 and 4). This will guard against the possibility of arcing between the pins (which are 0.030 in. apart) under worst-case dust and oil board buildup conditions.
Electrical Characteristics TA = 25 C
Minimum and maximum values are testing requirements. Typical values are characteristics of the device and are the result of engineering evaluations. Typical values are for information purposes only and are not part of the testing requirements. Table 1. dc Specifications, Normal Operation (See Figures 2 and 3.) Parameter Activate/Nonactivate Voltage Breakover Current dc Voltage Drop Active State dc Leakage Current Hold/Release Current Active State Minimum ON Current Minimum ON Current Minimum ON Current Maximum ON Current Maximum ON Current Optocoupler LED Current Active State (6N139) Symbol VAN IBO VON ILKG IH/R IMIN1 IMIN2 IMIN3 IMAX1 IMAX2 ILED Test Condition -- -- 1 mA ISL 20 mA VOFF = 20 V -- VON < 54 V 54 V VON 100 V for 2 s Source Resistance: 200 to 4 k VON > 100 V VON 70 V VON > 70 V -- Min 30.0 -- -- -- 0.1 20 9.0 0 -- -- 0.2 Typ 37.0 0.5 13.75 0.001 0.5 35 45 0.2 -- -- 0.3 Max 39.0 1.0 15 5 1.0 -- -- -- 70 VON ------------1 k 10 Unit V mA V A mA mA mA mA mA mA mA
Table 2. ac Specifications, Normal Operation Parameter ac Impedance Linearity Distortion Linearity Distortion Symbol ZMT D1 D2 Test Condition 200 Hz to 50 kHz (See Figure 4.) f = 200 Hz to 40 kHz, ISL = 1 mA to 20 mA VAPP 10.5 VPP (See Figures 4 and 5.) f = 200 Hz to 40 kHz, ISL = 1 mA to 20 mA VAPP 12 VPP (See Figures 4 and 5.) Min 10 75 50 Typ 50 84 80 Max -- -- -- Unit k dB dB
Lucent Technologies Inc.
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LH1465AB/AAE ISDN dc Termination IC
Data Sheet February 1998
Electrical Characteristics TA = 25 C (continued)
Table 3. Transition Specifications, Normal Operation (See Figure 6.)
Parameter Activate Time Release Time Symbol t1 t2 Test Condition See Figure 6. See Figure 7. Min 3.0 3.0 Typ 22 10 Max 50 100 Unit ms ms
Testing Characteristics
Table 4. Abnormal Conditions Class 1 (Survivable; No Device Damage) Assume carbon block primary protectors at demarcation point. Assume crowbar protection across the LH1465 device with peak voltages limited to 250 V.
Test Name Obsolete Sealing Current MLT Testing Parameter Voltage Duty Cycle Voltage Source Impedance Duration Duty Cycle ac Voltage dc Voltage Source Impedance Duty Cycle Value 72 V Continuous 190 V 200 <1 s 25% 150 Vrms 52 V 200 33% over 6 s
Inadvertent Ringing
Lightning:* L1 Normal Peak Voltage Rise Time vs. Fall Time Peak Current Repetitions (each polarity) Peak Voltage Rise Time vs. Fall Time Peak Current Repetitions (each polarity) Peak Voltage Rise Time vs. Fall Time Peak Current Repetitions (each polarity) 600 V 10 x 1000 s 200 A 4 1000 V 10 x 560 s 200 A 2 1000 V 10 x 160 s 200 A 2
L2 Normal
L3 Normal
* Voltages are applied from the first lead of the pair to ground with the second lead of the pair grounded, from the second lead of the pair to ground with the first lead grounded, and from the pair connected together to ground.
Table 5. Abnormal Conditions Class 2 (Fail Safe; No Fire) Assume carbon block primary protectors at demarcation point. Assume crowbar protection across the LH1465 device with peak voltages limited to 250 V.
Test Name ac Power Cross: Case 1 Case 2 Case 3 Parameter Voltage Source Impedance Duration Voltage Source Current Limit Duration Voltage Source Current Limit Duration Value 300 Vrms--600 Vrms 3 5s 0 Vrms--600 Vrms 0 A--2 A 30 minutes 300 Vrms--600 Vrms 2 A--6 A 5s
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Lucent Technologies Inc.
Data Sheet February 1998
LH1465AB/AAE ISDN dc Termination IC
Component Specifications
Table 6. LED Trigger Specifications During MLT Signaling Parameter Applied ac Voltage Applied ac Frequency Number of Half Cycles Applied Total Loop Resistance Required LED Response at the Output of the 6N139: Number of Pulses per Half Cycle Applied Pulse Width (opto ON) Pulse Width (opto OFF) Symbol -- -- -- -- -- PWL PWH Test Condition -- -- -- -- -- (See Figure 9.) (See Figure 9.) Min 60 2 6 900 -- 10 10 Typ -- -- -- -- 1 -- -- Max Unit
62 VPEAK 3 Hz 10 -- 4500 -- -- -- -- ms ms
Table 7. LED Trigger Specifications During Dial Test Set Signaling (See Figure 10.) Parameter Applied dc Battery Voltage Frequency (pulses per second) Percent Break Number of Pulses Total Loop Resistance Required LED Response at the Output of the 6N139: Number of Pulses per Make/Break Applied Pulse Width (opto ON) Pulse Width (opto OFF) Symbol -- -- -- -- -- -- PWL PWH Test Condition -- -- -- -- -- -- (See Figure 9.) (See Figure 9.) Min -43.5 4 40 6 200 -- 10 10 Typ -- -- -- -- -- 1 -- -- Max -56 8 60 10 4000 -- -- -- Unit Vdc -- % -- -- ms ms
Table 8. Discrete Component Specification (See Figures 10 and 11.) Component Function Sets Current Limit Provides Shunt Path During Current Limit Sets Activate Deactivate Time Constant: Provides Gate-source Voltage Stabilization for Electronic Inductor Optoisolator Provides Interface to Maintenance Mode Circuit
* Insulation resistance of this part must be >2 G.
Value Name R1 R2 C1* PD1 68 2.2 k 1 F --
Tol. (%) 1 5 10 --
Type 1/4 W 4W -- 6N139
Lucent Technologies Inc.
5
LH1465AB/AAE ISDN dc Termination IC
Data Sheet February 1998
Characteristic Curves
1A
100 mA VON 10 mA ON STATE
IMAX1
IMIN1
CURRENT
VAN 1 mA TRANSITION REGION 100 A IHR IBO
10 A TRANSITION REGION
1 A
OFF STATE
ILKG
0 0 10 20 30 40 50
12-1937
ABSOLUTE VOLTAGE (V)
Figure 2. I-V Requirement Template, 0 V to 50 V
1A IMAX1 100 mA IMAX2 (54 V, 9 mA) 10 mA CURRENT IMIN1 IMIN2 1 mA (70 V, 70 mA)
100 A
10 A
1 A (100 V, 0 mA) 0 IMIN3 150 200 250
12-1938
0
50
100
ABSOLUTE VOLTAGE (V)
Figure 3. I-V Requirement Template, 0 V to 250 V 6 Lucent Technologies Inc.
Data Sheet February 1998
LH1465AB/AAE ISDN dc Termination IC
Test Circuits
68 F
Vmt ac GENERATOR 1 mA--20 mA
DUT
dc CURRENT SOURCE Vsig
1 k
|Zmt| = 1000Vx Vmt-sig -----------------------------1000 Vmt Linearity = 20 log -------------------------------------------------- + 20 log -----------Vsig - 2nd Harm. 67.5
12-1939
Figure 4. Test Circuit for ac Impedance and Linearity
ACCEPTABLE 75
LINEARITY (dB)
UNACCEPTABLE 50
0 0 0.5 10.0 10.5 11.0 11.5 12.0
APPLIED ac VOLTAGE (VPP)
12-1940
Figure 5. Linearity Requirement Template
Lucent Technologies Inc.
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LH1465AB/AAE ISDN dc Termination IC
Data Sheet February 1998
Test Circuits (continued)
1 F
ACTIVATION: SEE FIG. 7 DEACTIVATION: SEE FIG. 8
DUT
85 mH
85
12-1941
Figure 6. Test Circuit for Activate and Deactivate Times
43.5 V 40 V
SOURCE IMPEDANCE: 200 --4 k 30 V t1
20 V
MEASURE 500 ms 10 V
0
12-1942
Figure 7. Applied Waveform for Activation Test
8
Lucent Technologies Inc.
Data Sheet February 1998
LH1465AB/AAE ISDN dc Termination IC
Test Circuits (continued)
2.0 mA
CURRENT SOURCE LIMITED TO 30 V
MEASURE 1.5 mA 500 ms
1.0 mA
t2 0.5 mA
0
12-1943
Figure 8. Applied Waveform for Deactivation Test
RLOOP 200 --4 k 900 --4.5 k (MLT) 1 F 85
SERIES ROTARY DIAL 25
+
VBAT -43.5 V TO -56 V 60 V PEAK, 2 Hz--3 Hz (MLT)
85 mH 25 SHUNT ROTARY DIAL
RING
TIP + R3 10 k 1/4 W, 1%
1
8 7 6 5
R2 2.2 k 4 W, 5%
R1 68 1/4 W, 1%
PD1 C1 1 F
1 2 3 4 8 7 6 5
VCC 5V
2 3 4
+ VOUT -
12-1944
LH1465AB
6N139
Notes: For series test, open SHUNT rotary dial. For shunt test, short SERIES rotary dial. For MLT test, short SERIES rotary dial and open SHUNT rotary dial.
Figure 9. Test Circuit for LED Operation Lucent Technologies Inc. 9
LH1465AB/AAE ISDN dc Termination IC
Data Sheet February 1998
Test Circuits (continued)
RING TIP
1
8 7
R1 68 1/4 W, 1%
PD1 C1 1 F
1 2 3 4 8 7 6 5
2.2 k 4 W, 5%
2
R2
3 4 6 5
LH1465AB
6N139
12-1945
Figure 10. Connection Diagram
25 TIP
1 F
TIP 200 V--250 V PROTECTION RING 2.2 k 4 W, 5% R2
1 2 3 4
8 7 6 5
R1 68 1/4 W, 1%
C1 1 F
TRANSCEIVER
LH1465AB
25 RING
PD1
1 2 3 4 8 7 6 5
MAINTENANCE MODE CIRCUIT
6N139
12-1946
Note: The Lucent T7256 is suitable for use as the transceiver. See Figure 6 in the T7256 Single-Chip NT1 (SCNT1) Transceiver Data Sheet for an example of a reference circuit that uses the LH1465 and the T7256.
Figure 11. Typical NT1 Application
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Lucent Technologies Inc.
Data Sheet February 1998
LH1465AB/AAE ISDN dc Termination IC
Outline Diagrams
Dimensions are in millimeters.
8-Pin, Plastic DIP (LH1465AB)
L N
B
1 PIN #1 IDENTIFIER ZONE W
H SEATING PLANE 0.38 MIN 2.54 TYP 0.023 MAX
5-4410r.1
16-Pin, Plastic SOG (LH1465AAE)
L N
B
1 PIN #1 IDENTIFIER ZONE W
H SEATING PLANE 0.10 1.27 TYP 0.020 MAX 0.024 0.36 MIN
5-4414r.2
Package Description Number of Maximum Pins (N) Length (L) PDIP3 (Plastic Dual-In-Line Package) SOG (Small Outline, Gull-Wing) Lucent Technologies Inc. 8 16 10.16 10.49
Package Dimensions Maximum Width Without Leads (B) 6.48 7.62 Maximum Width Including Leads (W) 7.87 10.64 Maximum Height Above Board (H) 5.46 2.67 11
LH1465AB/AAE ISDN d Termination IC c
Data Sheet February 1998
Ordering In formation
Device LH1465AB LH1465AAE Package 8-Pin, Plastic DIP 16-Pin, Plastic SOG Comcode 106444987 106725054
For additional information, contact your Microelectronics Group Account Manager or the following: INTERNET: http://ww w.lucent.com/mic ro E-MAIL: docmaster@mic ro.lucent.com U.S.A.: Microelectronics Group, Lucent Technologies Inc., 555 Union Boulevard, Room 30L-15P-BA, Allentown, PA 18103 1-800-372-2447, FAX 610-712-4106 (In CANADA: 1-800-553-2448, FAX 610-712-4106) ASIA PACIFIC: Microelectronics Group, Lucent Technologies Singapore Pte. Ltd., 77 Science Park Drive, #03-18 Cintech III, Singapore 118256 Tel. (65) 778 8833, FAX (65) 777 7495 JAPAN: Microelectronics Group, Lucent Technologies Japan Ltd., 7-18, Higashi-Gotanda 2-chome, Shinagawa-ku, Tokyo 141, Japan Tel. (81) 3 5421 1600, FAX (81) 3 5421 1700 EUROPE: Data Requests: MICROELECTRONICS GROUP DATALINE: Tel. (44) 1189 324 299, FAX (44) 1189 328 148 Technical Inquiries: GERMANY: (49) 89 95086 0 (Munich), UNITED KINGDOM: (44) 1344 865 900 (Bracknell), FRANCE: (33) 1 41 45 77 00 (Paris), SWEDEN: (46) 8 600 7070 (Stockholm), FINLAND: (358) 9 4354 2800 (Helsinki), ITALY: (39) 2 6601 1800 (Milan), SPAIN: (34) 1 807 1441 (Madrid)
Lucent Technologies Inc. reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application. No rights under any patent accompany the sale of any such product(s) or information.
Copyright (c) 1997 Lucent Technologies Inc. All Rights Reserved
February 1998 DS97-414ISDN (Replaces DS93-015HVIC and DA95-031ISDN)
Printed On Recycled Paper

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