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參數(shù)資料
| 型號： | L7597 |
| 廠商： | Lineage Power |
| 英文描述： | Resistive Subscriber Line Interface Circuit (SLIC), Ring Relay, and Protector (SRP) for Short Loop and TA-909 Applications(用于短環(huán)路和TA-909的電阻性用戶線接口、振鈴繼電器和保護器) |
| 中文描述： | 電阻用戶線接口電路（SLIC），環(huán)繼電器和保護（SRP）的短環(huán)路和TA - 909應(yīng)用（用于短環(huán)路和電訊- 909的電阻性用戶線接口，振鈴繼電器和保護器） |
| 文件頁數(shù)： | 1/34頁 |
| 文件大?。?/td> | 564K |
| 代理商： | L7597 |
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Advance Data Sheet
March 1997
L7597 Resistive Subscriber Line Interface Circuit (SLIC), Ring
Relay, and Protector (SRP) for Short Loop and TA-909 Applications
Features
I
Low-power scan mode for low on-hook power dis-
sipation (40 mW)
I
Low active power dissipation (125 mW max)
I
Distortion-free, on-hook transmission
I
Eight operating states via latched parallel data
inputs with channel select feature
I
Battery switch for dual power supply operation
I
Precision fixed 25 mA current limiter
I
Integrated protection
I
No external protection device required
I
Integrated ringing access relay
I
Ring trip detector
I
Loop closure detector with hysteresis
I
Relay driver
I
Battery noise cancellation
I
Thermal protection
I
32-pin, surface-mount, plastic package (PLCC)
Description
The L7597 is a resistive subscriber line interface
circuit (SLIC) that is optimized for short loop applica-
tions, such as Bellcore TA-NWT-000909 require-
ments for the fiber-in-the-loop (FITL) applications. It
interfaces with the low-voltage circuits on an analog
line card to the Tip/Ring subscriber loop. The L7597
does not supply dc current to the subscriber loop;
external resistors are used for this purpose.
Included in the L7597 are a solid-state ringing
access switch and a line break switch. Also included
is a relay driver for an external (test) access mechan-
ical relay.
State control is via four latched parallel data inputs. A
chip select feature allows the user to enable, disable,
or rest the data latches to a known logic state.
The L7597 offers a low-power scan state to minimize
power to less than 40 mW in the on-hook state. The
active power is also very low (<125 mW). The L7597
also supports on-hook transmission; however, power
dissipation will be higher (<700 mW) in the on-hook
transmission state.
To minimize the off-hook power that is dissipated in
the subscriber loop, the L7597 also offers a battery
switch feature. The high-voltage battery is applied
during an on-hook condition, to maintain compatibil-
ity with any preexisting standards. In an off-hook con-
dition, the battery is switched via a logic input to a
lower-voltage auxiliary battery, thus minimizing off-
hook power dissipation. Because the battery is
switched via an external logic control, the battery
switch is only suited for applications where the lower-
voltage battery is sufficient to drive the loop; i.e.,
short loop applications. Current is limited to a fixed
value of 25 mA by an internal precision current-limit
circuit.
Because of the internal architecture of the L7597
SLIC and because of the power rating of the associ-
ated external feed resistors, the L7597 will meet most
surge requirements without use of an external sec-
ondary protection device. Internal circuitry steers
both positive and negative faults to fault ground. Neg-
ative faults are not dumped into the battery.
The L7597 is a chip line interface solution package in
a single 32-pin PLCC package. The Tip and Ring
drive amplifiers, the XMT amplifier, the receive inter-
face, and battery noise cancellation circuits are fabri-
cated in a 90 V complementary bipolar (CBIC)
process. The ring access switch, line break switch,
battery switch, current limit, protection functions,
supervision, and control functions are fabricated in a
320 V dielectrically isolated bipolar-CMOS-DMOS
(BCDMOS) process. The device is available in a
32-pin PLCC package.
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