5

UNCOMMITTED OP AMP SPECIFICATIONS

Input Offset Voltage

-

±5-

mV

Input Offset Current

-

±10

-

nA

Input Bias Current

-20

-

nA

Differential Input Resistance

(Note 4)

-

1

-

M

Ω

Output Voltage Swing

-

±3-

Output Resistance

-

10

-

Ω

Small Signal GBW

(Note 4)

-

1

-

MHz

NOTES:

5. These parameters are controlled by design or process parameters and are not directly tested. These parameters are characterized upon initial

design release, upon design changes which would affect these characteristics, and at intervals to assure product quality and specification

compliance.

Electrical Specifications

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Pin Descriptions

24 PIN

DIP/SOIC

7 x 7

QFN

SYMBOL

DESCRIPTION

1

28

TIP

An analog input connected to the TIP (more positive) side of the subscriber loop through a sense resistor

and for loop monitoring purposes.

2

31

RING

An analog input connected to the RING (more negative) side of the subscriber loop through a sense

telephone and for loop monitoring purposes.

3

32

RFS

Senses ring side of loop for ground key and ring trip detection. During ringing, the ring signal is inserted

into the line at this node and RF is isolated from RFS via a relay.

41

53

Capacitor #1 - An external capacitor to be connected between this terminal and analog ground. Required

6

4

DG

Digital Ground - To be connected to zero potential and serves as a reference for all digital inputs and

outputs on the SLIC microcircuit.

7

5

RS

Ring Synchronization Input - A TTL - compatible clock input. The clock should be arranged such that a

positive pulse transition occurs on the zero crossing of the ring voltage source, as it appears at the RFS

terminal. For Tip side injected systems, the RS pulse should occur on the negative going zero crossing

and for Ring injected systems, on the positive going zero crossing. This ensures that the ring relay

activates and deactivates when the instantaneous ring voltage is near zero. If synchronization is not

required, the pin should be tied to 5V.

86

RD

Relay Driver - A low active open collector logic output. When enabled, the external ring relay is energized.

9

7, 8

TF

Functions with the RF terminal to provide loop current, feed voice signals to the telephone set, and sink

longitudinal current.

10

9, 10

RF

Ring Feed - A low impedance analog output connected to the RING terminal through a sense resistor

sink longitudinal current.

11

11

to -58V. Frequently referred to as “battery”.

12

12

BG

Battery Ground - To be connected to zero potential. All loop current and some quiescent current flows into

this ground terminal.

13

13

SHD

Switch Hook Detection - A low active LS TTL - compatible logic output. This output is enabled for loop

currents exceeding the switch hook threshold.

14

14,19

NC

Used during production test. Leave disconnected.

HC5503PRC