Data Sheet
March 1997
L7554 Low-Power SLIC
Electrical Characteristics (continued)
Table 9. Logic Inputs and Outputs
All outputs except RGDET are open-collector with internal pull-up resistor. RGDET is open-collector without inter-
nal pull-up.
Parameter
Symbol
Min
Typ
Max
Unit
Input Voltages
Low Level (permissible range)
High Level (permissible range)
VIL
VIH
–0.5
2.0
0.4
2.4
0.7
VCC
V
V
Input Currents
Low Level (VCC = 5.25 V, VI = 0.4 V)
High Level (VCC = 5.25 V, VI = 2.4 V)
IIL
IIH
—
—
–115
–60
–200
–100
µA
µA
Output Voltages (open-collector with internal pull-up
resistor)
Low Level (VCC = 4.75 V, IOL = 360 µA)
High Level (VCC = 4.75 V, IOH = –20 µA)
VOL
VOH
0
2.4
0.2
—
0.4
VCC
V
V
Ring Trip Requirements
200 Ω
TIP
RING
RING
■ Ringing signal:
— Voltage, minimum 35 Vrms, maximum 100 Vrms.
— Frequency, 17 Hz to 23 Hz.
— Crest factor, 1.4 to 2.
SWITCH CLOSES < 12 ms
6 µF
TIP
TIP
■ Ringing trip:
— ≤100 ms (typical), ≤250 ms (VBAT = –33 V, loop
length = 530 Ω).
10 kΩ
■ Pretrip:
— The circuits in Figure 3 will not cause ringing trip.
2 µF
100 Ω
RING
12-2572 (C)
Figure 3. Ring Trip Circuits
Lucent Technologies Inc.
11
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