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PDF LH1465AB Data sheet ( Hoja de datos )
| Número de pieza | LH1465AB | |
| Descripción | LH1465AB/AAE ISDN dc Termination IC Data Sheet Advisory | |
| Fabricantes | Agere Systems | |
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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
+5 V
R8
17.8 kΩ
R10
10 kΩ
8
6
SCNT1
OPTOIN
PIN
5
R9 7
2.2 MΩ
U2
2
3
HCPL-0701
CA
1.0 µF
C15
1.0 µF
R11
137 Ω
R12
137 Ω
ZD
(PLACE THIS CAPACITOR AS
CLOSE AS POSSIBLE TO THE LH1465)
LH1465AB
8 TC
PR+ 1
7 RS
6 PD
U3
T2
R3
5 COM
PR– 4
R14
1.1 kΩ
2W
R15
1.1 kΩ
2W
FOR NORTH AMERICAN
APPLICATIONS ONLY
RING
TIP
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 sig-
nal 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 µF ±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.
1 page  
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 abso-
lute 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
Symbol
Min
Typ
Max Unit
Ambient Operating Temperature
TA –40 — 85 °C
Storage Temperature
Tstg –40 — 125 °C
Power Dissipation
PD — — 1 W
Pin Soldering Temperature (t = 15 s)
—
—
— 300 °C
Maximum Voltage (T/R, R/T)*
— — — 300 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 test-
ing 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
Symbol
VAN
IBO
VON
ILKG
IH/R
Test Condition
—
—
1 mA ≤ ISL ≤ 20 mA
VOFF = 20 V
—
IMIN1
IMIN2
IMIN3
IMAX1
IMAX2
VON < 54 V
54 V ≤ VON ≤ 100 V for 2 s Source
Resistance: 200 Ω to 4 kΩ
VON > 100 V
VON ≤ 70 V
VON > 70 V
Min
30.0
—
—
—
0.1
20
9.0
0
—
—
Optocoupler LED Current
ILED
—
0.2
Active State (6N139)
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
-1V-----Ok----ΩN---
10
Unit
V
mA
V
µA
mA
mA
mA
mA
mA
mA
mA
Table 2. ac Specifications, Normal Operation
Parameter
Symbol
Test Condition
Min Typ Max Unit
ac Impedance
ZMT
200 Hz to 50 kHz (See Figure 4.)
10 50 — kΩ
Linearity Distortion D1 f = 200 Hz to 40 kHz, ISL = 1 mA to 20 mA 75 84 — dB
VAPP ≤ 10.5 VPP (See Figures 4 and 5.)
Linearity Distortion D2 f = 200 Hz to 40 kHz, ISL = 1 mA to 20 mA 50 80 — dB
VAPP ≤ 12 VPP (See Figures 4 and 5.)
Lucent Technologies Inc.
3
5 Page 
Data Sheet
February 1998
Test Circuits (continued)
2.0 mA
1.5 mA
1.0 mA
0.5 mA
LH1465AB/AAE ISDN dc Termination IC
CURRENT SOURCE LIMITED TO 30 V
500 ms
MEASURE
t2
0
Figure 8. Applied Waveform for Deactivation Test
SERIES
RL OOP
200 Ω—4 kΩ
900 Ω—4.5 kΩ (MLT)
ROTARY DIAL
1 µF
25 Ω
85 mH
25 Ω
+ VBAT
85 Ω
–43.5 V TO –56 V
60 V PEAK, 2 Hz—3 Hz
(MLT)
SHUNT
ROTARY DIAL
12-1943
RING
TIP
R2
2.2 kΩ
4 W, 5%
18
R1 68 Ω
27
1/4 W, 1%
36
45
LH1465AB
C1
1 µF
PD1
1
2
3
4
6N139
8
7
6
5
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.
Lucent Technologies Inc.
Figure 9. Test Circuit for LED Operation
+
R3
10 kΩ
1/4 W, 1%
VCC
5V
+
VOUT
–
12-1944
9
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