參數(shù)資料
型號(hào)： L8574D
廠商： Lineage Power
英文描述： Resistive Subscriber Line Interface Circuit (SLIC), Ring Relay, and Protector (SRP) for Long Loop and TR-57 Applications(長(zhǎng)環(huán)路和TR-57應(yīng)用的電阻性用戶線接口，振鈴繼電器和保護(hù)器)
中文描述： 電阻用戶線接口電路（SLIC），環(huán)繼電器和保護(hù)（SRP）的為遠(yuǎn)距離和TR - 57應(yīng)用（長(zhǎng)環(huán)路和訓(xùn)練班- 57應(yīng)用的電阻性用戶線接口，振鈴繼電器和保護(hù)器）
文件頁(yè)數(shù)： 16/36頁(yè)
文件大?。?/td> 565K
代理商： L8574D
16
Lucent Technologies Inc.
Data Sheet
October 1998
Relay, and Protector (SRP) for Long Loop and TR-57 Applications
L8574D Resistive Subscriber Line Interface Circuit (SLIC), Ring
Electrical Characteristics
(continued)
Switch Characteristics
(continued)
12-3332 (F)
Figure 3. Switch On-State V-I Characteristics SW1
and SW2
12-3333 (F)
Figure 4. Switch On-State V-I Characteristics SW3
Operating States
The L8574 has eight operating states. These states are
selected using three logic input bits, B0—B2, according
to the truth table shown in Table 14. Logic input B3
operates a relay driver independent of the state of bits
B0—B2. Data on the parallel data bus, B0—B3, is
loaded into a 4-bit latch on the L8574 on the low-to-
high transition of the channel select lead CS. Changes
in the data at inputs B0—B3 do not affect the L8574
while CS is either low or high. A low on channel enable
lead CE asynchronously resets the 4-bit latch to 1111
(scan state with the relay driver off) and disables the
channel select lead CS (i.e., CS is prevented from load-
ing any data into the 4-bit latch). A high on CE enables
CS. State transitions and delays between transitions
are left to the discretion of the user since, except for
fault conditions described later, the state of the L8574
depends only on the external control provided through
the logic interface.
Table 14. Input State Coding
Scan State
I
Normal on-hook supervision state.
I
The receive transmission path is powered down; the
transmit path is powered up.
I
The battery feed is connected to the high battery
supply (V
BAT1
).
I
The current limiter is powered down and disabled.
I
SW1 is closed; SW2 and SW3 are open.
I
NSTAT reflects the status of the switchhook detector.
+I
LIMIT
I
SW
+1.5 V
2/3 R
ON
R
ON
–1.5 V
2/3 R
ON
–I
LIMIT
–V
max
CURRENT
LIMITING
+V
max
V
SW
CURRENT
LIMITING
I
SW
V
SW
R
ON
–V
OS
+V
OS
R
ON
CE B3 B2 B1 B0
0
X
X
1
X
1
1
X
1
1
X
1
1
X
1
1
X
0
1
X
0
1
X
0
1
X
0
1
0
X
State
X
1
1
0
0
1
1
0
0
X
X
1
0
1
0
1
0
1
0
X
Scan state with relay driver off
Scan
Disconnect
Alternative talk—SW1 closed
Talk—SW1 open
Scan current limit
Ringing
On-hook transmission
Intermediate talk
Relay driver output (RDO) is
low (relay active)
Relay driver output (RDO) is
high (relay not active)
1
1
X
X
X
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