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ATTL7554AP

L7554 Low-Power SLIC

Agere -> LSI Corporation 

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 (VCC = 5.25 V, VI = 0.4 V)

High Level (VCC = 5.25 V, VI = 2.4 V)

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)

Symbol

VIL

VIH

IIL

IIH

Min

Typ

Max

Unit

–0.5

0.4

0.7

V

2.0

2.4

VCC

V

—

–115 –200

µA

—

–60

–100

µA

VOL

0

0.2

0.4

V

VOH

2.4

—

VCC

V

Ring Trip Requirements

s Ringing signal:

— Voltage, minimum 35 Vrms, maximum 100 Vrms.

— Frequency, 17 Hz to 23 Hz.

— Crest factor, 1.4 to 2.

s Ringing trip:

— ≤100 ms (typical), ≤250 ms (VBAT = –33 V, loop

length = 530 Ω).

s Pretrip:

— The circuits in Figure 3 will not cause ringing trip.

200 Ω

TIP

SWITCH CLOSES < 12 ms

6 µF

TIP

10 kΩ

2 µF

100 Ω

TIP

Figure 3. Ring Trip Circuits

RING

RING

RING

12-2572 (C)

Lucent Technologies Inc.

11

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