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參數(shù)資料
| 型號(hào)： | L8567 |
| 英文描述： | SLIC for Peoples Republic of China Applications |
| 中文描述： | 為人民共和國(guó)的中國(guó)用戶接口的應(yīng)用 |
| 文件頁(yè)數(shù)： | 4/42頁(yè) |
| 文件大小： | 701K |
| 代理商： | L8567 |
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4
Lucent Technologies Inc.
Data Sheet
August 1999
People’s Republic of China Applications
L8567 SLIC for
Description
(continued)
General
(continued)
This device uses a latched parallel data input interface
and a gated parallel output data interface. Level-sensi-
tive data latches are used for state control inputs, and
level-sensitive control gates are used for supervision
outputs. Latch and gate control are through an
ENABLE pin. When the ENABLE pin is high, input data
is latched and the SLIC will not respond to changes at
its logic input. When ENABLE is low, input control data
will flow through the latch. Valid supervision data will
appear at the NSTAT and NTSD outputs only when
ENABLE is low. In this manner, the data input and data
output of multiple SLICs can be serviced by a single
control input or output. The L8567 is designed to be
controlled/supervised using control/supervision outputs
and inputs from the T7507 codec.
Three relay drivers are also included. These drivers are
meant to drive electromechanical relays (EMRs). State
control of the relay drivers is via latched parallel data
inputs. Like the B0/B1 and supervision data, control
leads from the T7507 codec drive these inputs. The
T7507 relay driver control outputs are meant to control
the associated control input on all four of the L8567
SLICs associated with the T7507 codec.
If an L7583 solid-state switch is used (instead of
EMRs), the data control outputs from the T7507 codec
will drive the latched state control inputs of the L7583
directly. Again, one data control output from the T7507
will drive the corresponding data input on four channels
of the L7583. In the case of using the L7583, tie RD1I,
RD2I, and RD3I relay driver control inputs of the L8567
to ground.
Included are two supervision outputs. Both supervision
outputs are the wire-OR of the loop closure and ring
trip detectors. One (NSTAT) is used as a data control
output and is gated via the EN input. The other (NLED)
can be used to drive an LED to indicate loop states.
The NLED driver is an open collector output, so multi-
ple outputs may be used to drive a single LED. NLED is
not gated, so valid supervision data appears at NLED
regardless of the state of EN. NLED can be used as an
alternative, nongated, data control output.
The L8567 is available in a 32-pin PLCC or 44-pin
PLCC package.
Application for People’s Republic of China
This SLIC may be used with any commercially avail-
able codec; however, when used with the Lucent Tech-
nologies Microelectronics Group T7507, the two
devices form a complete line circuit optimized for
requirements in the People’s Republic of China. The ac
interface between the two components is extremely
simple, requiring only a single capacitor in the transmit
direction and a short-circuit connection, using no exter-
nal components, in the receive direction.
The complex 200
+ 680
||
100 nF termination and
hybrid balance is digitally synthesized by the T7507
codec. Additionally, the tip/ring to PCM (transmit) gain
is fixed and set digitally by the T7507 codec at
0 dB. The PCM to tip/ring (receive) gain is also digitally
set by the T7507 codec and is programmable via a bit
in the codec serial data control stream to either
–3.5 dB or –7.0 dB.
The control interfaces of the L8567 and T7507 are
designed for compatibility with each other.
Both the T7507 codec and L8567 SLIC require only
battery and +5 V to operate. When both devices are
used, no –5 V supply is required.
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