LH1465AAE Lineage Power, LH1465AAE Datasheet
LH1465AAE
Manufacturer Part Number
LH1465AAE
Description
SOP-16
Manufacturer
Lineage Power
Datasheet
1.LH1465AAE.pdf
(14 pages)
Specifications of LH1465AAE
Date_code
01+
Available stocks
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Part Number
Manufacturer
Quantity
Price
Part Number:
LH1465AAE
Manufacturer:
LUCENT
Quantity:
20 000
Part Number:
LH1465AAE-TR
Manufacturer:
LUCENT
Quantity:
20 000
Advisory
July 1998
Application Circuit
Replace Figure 11 on page 10 of the LH1465AB/AAE data sheet with the figure shown below.
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 Z
MMSZ4685T1). Capacitor C
C
voltage, which increases the robustness of the circuit.
* Motorola is a registered trademark of Motorola Inc.
A
is added to provide a level of filtering for the transition points (turn-on or turn-off) of the optoisolator input
OPTOIN
SCNT1
Figure 1. MLT Circuit Showing New Placement of Zener Diode (Z
PIN
+5 V
R8
17.8 k
2.2 M
6
5
R9
10 k
R10
7
8
A
is a 1.0 µF 10% tantalum chip capacitor, with a voltage rating of at least 16 V.
U2
HCPL-0701
MLT CIRCUIT
2
3
LH1465AB/AAE ISDN dc Termination IC
C
1.0 µF
A
FOR NORTH AMERICAN
APPLICATIONS ONLY
1.0 µF
C15
137
137
R11
R12
Z
D
(PLACE THIS CAPACITOR AS
CLOSE AS POSSIBLE TO THE LH1465)
8
7
6
5
TC
RS
PD
COM
LH1465AB
D
U3
(for example, Motorola *
Data Sheet Advisory
PR+
PR–
D
R
T
) and Capacitor (C
1
2
3
4
RING
TIP
R14
1.1 k
2 W
R15
1.1 k
2 W
A
)
5-7034(C)
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