LUCL8574DP-D AGERE [Agere Systems], LUCL8574DP-D Datasheet - Page 8

• Manufacturer Part Number: LUCL8574DP-D
• Description: L8574D Resistive Subscriber Line Interface Circuit(SLIC), Ring Relay,and Protector(SRP)for Long Loop and TR-57 Applications
• Manufacturer: AGERE [Agere Systems]

L8574D Resistive Subscriber Line Interface Circuit (SLIC), Ring
Relay, and Protector (SRP) for Long Loop and TR-57 Applications
Electrical Characteristics
Ring Trip Detector
Table 3. Ring Trip Detector
1. The ringing source consists of the ac and dc voltages added together (battery-backed ringing); the ringing return is battery ground.
2. Pretrip: ringing must not be tripped by a 10 k resistor in parallel with an 8 F capacitor applied across Tip and Ring.
Battery Feed
Table 4. Battery Feed
1. Assumes 2 x 200
2. When the current-limit circuit is active and the battery switch is off, the longitudinal current must be less than the dc loop current to ensure
3. Assumes C
4. Detector values are independent of office battery and are valid over the entire range of V
5. IEEE is a registered trademark of The Institute of Electrical and Electronics Engineers, Inc.
6. Assumes the external dc feed resistors are matched to 0.2% and proper battery noise cancellation; i.e., a 0.22 F capacitor from V
7. Assumes proper battery noise cancellation; i.e., a 0.22 F capacitor from V
8
Ringing Source
Ring Trip
Loop Resistance Range
Longitudinal Current Capability per Wire
dc Loop Current Limit (R
Current-limiter ac Output Impedance
Current-limiter Transient Current (in response to a step voltage
Switchhook Detector Loop Resistance
Longitudinal to Metallic Balance— IEEE
Metallic to Longitudinal (Harm) Balance
change on V
proper ac transmission.
on-hook (NSTAT = 1) if either V
thermal shutdown. The status of the thermal shutdown circuit is output on B3 when CS is high (thermal shutdown is a logic 0). V
V
one pin are shorted together):
— If V
— If V
(see Figure 5).
Frequency (f)
dc Voltage
ac Voltage
Loop Resistance
Trip Time (f = 20 Hz)
NSTAT Valid
I
200 Hz to 4 kHz
Off-hook (NSTAT = 0)
On-hook (NSTAT = 1)
200 Hz to 1 kHz
1 kHz to 3 kHz
200 Hz to 4 kHz
LOOP
BAT2
are defined as disconnected depending on the voltage at the power supply pins as follows (the pins of supplies that have more than
BAT1
BAT1
= 18 mA at V
2
(NSTAT = 0):
LIM
–20 V (i.e., more negative than –20 V) and V
–10 V (i.e., more positive than –10 V) or V
BF
= 33 nF; C
1
)
:
external dc feed resistors.
BAT2
LIM
1
= –42 V
LOOP
determines the ac output impedance of the current-limit circuit when it is active.
(3.17 dBm overload into 600 ):
BAT1
Parameter
Parameter
= 200 )
or V
BAT2
(continued)
3
is disconnected (open circuit) from its dc source and an off-hook (NSTAT = 0) if the L8574 is in
:
4
:
5
7
2
:
Std. 455
BAT2
BAT2
6
:
–10 V, then NSTAT must be on-hook (NSTAT = 1).
–20 V, then NSTAT must operate normally.
BF
to CBN (see Figure 5).
1840
4400
1840
26.5
Min
–36
Min
8.5
17
60
58
53
30
—
—
—
—
—
8
BAT1
and V
BAT2
3300
Typ
Typ
20
28
—
—
—
—
—
—
—
—
—
—
—
—
—
—
. However, NSTAT must indicate an
Lucent Technologies Inc.
2700
Max
Max
29.5
–57
105
200
150
28
80
25
—
—
—
—
—
—
—
—
October 1998
Data Sheet
mArms
BAT1
Vrms
BF
Unit
Unit
mA
mA
ms
ms
Hz
dB
dB
dB
V
to CBN
and