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參數資料
| 型號： | L8567-44PLCC |
| 英文描述： | Telecommunication IC |
| 中文描述： | 通信集成電路 |
| 文件頁數： | 9/42頁 |
| 文件大小： | 701K |
| 代理商： | L8567-44PLCC |
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Lucent Technologies Inc.
9
Data Sheet
August 1999
People’s Republic of China Applications
L8567 SLIC for
Coding Information
Table 2 shows the input state coding.
Table 2. Input State Coding
* All logic inputs are latched. The data latch is controlled by pin EN. The EN latch control is level sensitive.
When EN is high, the input data latches are active; that is, data at the B0, B1, RD1I, RD2I, and RD3I inputs are latched. The latched data will
control the state of the SLIC and drivers so that the SLIC and drivers will not respond to changes at the logic inputs while the level at EN is
high. When EN is low, the input latch is not active; therefore, data at the logic inputs will flow through the latch and immediately determine the
state of the SLIC and drivers.
If using an L758X solid-state switch, the switch is controlled directly from the T7507 codec; thus the relay drivers in the L8567 SLIC cannot be
used. If the relay drivers are not used, force them into the lowest power (not active) state by connecting RD1I, RD2I, and RD3I to ground.
B0*
1
B1*
1
RD3I* RD2I* RD1I*
X
X
State/Definition
X
Powerup, Forward Battery.
Normal talk and battery feed state. Pin PT
is positive with respect to PR. On-hook transmission is enabled. The ring
trip and loop closure detectors are active.
Powerup, Reverse Battery.
Normal talk and battery feed state. Pin PR
is positive with respect to PT. On-hook transmission is enabled. The ring
trip and loop closure detectors are active.
Low-Power Scan.
Except for off-hook supervision, all circuits are shut
down to conserve power. Pin PT is positive with respect to PR. Thermal
shutdown is active. Note that the ring trip detector is not active during the
low-power scan. To ensure that the ring trip detector is active during ring-
ing, the L8567 SLIC must be put into the forward or reverse powerup state
before applying power ringing to the loop.
Disconnect.
The tip and ring amplifiers are turned off and the SLIC goes
into a high-impedance (>100 k
) state. The L8567 will reset into this state
on powerup.
Driver RD1 Output Is Active.
Input pin RD1I is high. This will activate or
place the RD1 driver output into the on state. In the on state, the driver will
supply up to 40 mA of current (at 0.6 V) to the coil of an EMR, thus acti-
vating the EMR.
Driver RD1 Output Is Not Active
.
Input pin RD1I is low. This will place
the RD1 driver output into the off state. In the off state, the driver will not
supply current to the coil of an EMR, thus deactivating the EMR.
Driver RD2 Output Is Active.
Input pin RD2I is high. This will activate or
place the RD2 driver output into the on state. In the on state, the driver will
supply up to 40 mA of current (at 0.6 V) to the coil of an EMR, thus acti-
vating the EMR.
Driver RD2 Output Is Not Active
.
Input pin RD2I is low. This will place
the RD2 driver output into the off state. In the off state, the driver will not
supply current to the coil of an EMR, thus deactivating the EMR.
Driver RD3 Output Is Active.
Input pin RD3I is high. This will activate or
place the RD3 driver output into the on state. In the on state, the driver will
supply up to 40 mA of current (at 0.6 V) to the coil of an EMR, thus acti-
vating the EMR.
Driver RD3 Output Is Not Active
.
Input pin RD3I is low. This will place
the RD3 driver output into the off state. In the off state, the driver will not
supply current to the coil of an EMR, thus deactivating the EMR.
1
0
X
X
X
0
1
X
X
X
0
0
X
X
X
X
X
1
X
X
X
X
0
X
X
X
X
X
1
X
X
X
X
0
X
X
X
X
X
1
X
X
X
X
0
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