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
Input Voltages
Low Level (permissible range)
High Level (permissible range)
Input Currents
Low Level (V
CC
= 5.25 V, V
I
= 0.4 V)
High Level (V
CC
= 5.25 V, V
I
= 2.4 V)
Output Voltages (open-collector with internal pull-up
resistor)
Low Level (V
CC
= 4.75 V, I
OL
= 360
µA)
High Level (V
CC
= 4.75 V, I
OH
= –20
µA)
Symbol
V
IL
V
IH
I
IL
I
IH
Min
–0.5
2.0
—
—
Typ
0.4
2.4
–115
–60
Max
0.7
V
CC
–200
–100
Unit
V
V
µA
µA
V
OL
V
OH
0
2.4
0.2
—
0.4
V
CC
V
V
Ring Trip Requirements
200
Ω
s
Ringing signal:
— Voltage, minimum 35 Vrms, maximum 100 Vrms.
— Frequency, 17 Hz to 23 Hz.
— Crest factor, 1.4 to 2.
Ringing trip:
—
≤100
ms (typical),
≤250
ms (V
BAT
= –33 V, loop
length = 530
Ω).
Pretrip:
— The circuits in Figure 3 will not cause ringing trip.
TIP
SWITCH CLOSES < 12 ms
6 µF
TIP
10 kΩ
RING
s
RING
s
2 µF
TIP
100
Ω
RING
12-2572 (C)
Figure 3. Ring Trip Circuits
Lucent Technologies Inc.
11
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