L8575 查看數據表（PDF） - Agere -> LSI Corporation
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L8575 Datasheet PDF : 36 Pages
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L8575
Dual-Resistive, Low-Cost SLIC
Advance Data Sheet
March 1997
Electrical Characteristics (continued)
Table 3. Battery Feed, Switchhook Detectors (LCA and LCB), and Fault Detectors (FLTA and FLTB)
Parameter
Loop Resistance Range1:
(3.17 dBm overload into 600 Ω)
ILOOP = 18 mA at VBAT = –48 V
Longitudinal Current Capability per Wire
Switchhook Detector Loop Resistance2:
Off-hook (LC = 1)
On-hook (LC = 0)
Fault Detector2, 3:
|VTIP| or |VRING – VBAT|
No Fault (FLT = 0)
Fault (FLT = 1)
Detection Delay tDET (no fault to fault; CFLT = 0.1 µF)
Release Delay (fault to no fault; CFLT = 0.1 µF)
Min
Typ
Max
Unit
1800
8.5
—
—
4800
—
—
4000
—
—
—
—
—
3200
—
Ω
mArms
Ω
Ω
Ω
—
36
33
V
39
36
—
V
10
—
30
ms
1.6 tDET
—
2.5 tDET
ms
1. Assumes 2 x 300 Ω external dc feed resistors.
2. Detector values are independent of office battery and are valid over the entire range of VBAT.
3. Fault voltage is defined as the absolute value of the dc voltage across either dc feed resistor. If the voltage across either feed resistor
exceeds this value, a fault is determined to be present. FLT is forced to a 0 when D2 = 1 (ringing state).
Table 4. Ring-Trip Detectors (RTA, RTB, RZA, and RZB)
Parameter
Ringing Source1:
Frequency (ƒ)
dc Voltage
ac Voltage
Ring Trip2, 3 (RT = 1):
Loop Resistance
Trip Time (ƒ = 20 Hz)
RT Valid
Ringing Source Zero Crossing (referenced to VBAT/2):
Ringing Voltage Positive (RZ = 1)
Ringing Voltage Negative (RZ = 0)
Min
Typ
19
20
–39.5
—
60
—
2000
—
—
—
—
—
3VBAT/4
—
—
—
Max
28
–57
105
—
200
80
—
VBAT/4
1. The ringing source consists of the ac and dc voltages added together (battery-backed ringing); the ringing return is ground.
2. RT must also indicate ring-trip when the ac ringing voltage is absent (<5 Vrms) from the ringing source.
3. Pretrip: Ringing must not be tripped by a 10 kΩ resistor in parallel with an 8 µF capacitor applied across Tip and Ring.
Unit
Hz
V
Vrms
Ω
ms
ms
V
V
10
Lucent Technologies Inc.
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