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ATTL7557AAU

Low-Power SLICs with Battery Switch

Agere -> LSI Corporation 

Data Sheet

January 2000

L7556, L7557 Low-Power SLICs

with Battery Switch

Electrical Characteristics (continued)

Table 9. Logic Inputs and Outputs

All outputs except RGDET and LBAT are open collectors with internal, 30 kΩ pull-up resistor. RGDET and LBAT are

open collectors without internal pull-up. Input pin B1 has a 40 kΩ pull-up; it goes low in the event of thermal shut-

down.

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

VOL

VOH

Min

–0.5

2.0

–75

–40

0

2.4

Typ Max

0.4

0.7

2.4

VCC

–115 –200

–60 –100

0.2

0.4

—

VCC

Unit

V

V

µA

µA

V

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.

TIP

SWITCH CLOSES <12 ms

200 Ω

6 µF

TIP

10 kΩ

RING

RING

2 µF

100 Ω

TIP

RING

12-2572g (F)

Figure 3. Ring Trip Circuits

Lucent Technologies Inc.

11

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