MT8967AS datasheet(8/22 Pages) MITEL

8 / 22 page

MT8960/61/62/63/64/65/66/67 ISO2-CMOS

6-26

Logic Control Outputs SD0-5

These outputs are directly controlled by the logic

states of bits 0-5 in Register B. A logic low (GNDD)

in Register B causes the SD outputs to assume an

inactive state.

A logic high (VDD) in Register B

causes the SD outputs to assume an active state

(see Table 3). SD0-2 switch between GNDD and V

and may be used

control

external

logic

transistor circuitry, for example, that employed on the

line card for performing such functions as relay drive

for application of ringing to line, message waiting

indication, etc.

SD3-5 are used primarily to drive external analog

circuitry.

Examples may include the switching in or

out of gain sections or filter sections (eg., ring trip

filter) (Figure 7).

MT8962/63/66/67 provides all six SD outputs.

MT8960/61/64/65 each packaged in an 18-pin DIP

provide only four control outputs, SD0-3.

Figure 6 - Typical Line Termination

Telephone Set

2 Wire

Analog

Supervision

Protection

Battery

Feed

Ringing

PCM Highway

2W/4W

Converter

MT8960/61

MT8962/63

MT8964/65

MT8966/67

Table 3. Control States - Register B

BITS 0-2

LOGIC CONTROL OUTPUTS SD0-SD2

Inactive state - logic low (GNDD).

Active state - logic high (VDD).

BIT 3

LOGIC CONTROL OUTPUT SD3

Inactive state - High Impedance.

Active state - GNDA.

BITS 4,5

LOGIC CONTROL OUTPUTS SD4, SD5

Inactive state - High Impedance.

Active state - GNDD.

BIT 7

BIT 6

CHIP TESTING CONTROLS

Normal operation.

Transmit filter testing, i.e.:

Transmit filter input connected to VX input

Receive filter and Buffer disconnected from VR

Receive filter testing, i.e.:

Receive filter input connected to VX input

Receive filter input disconnected from codec

Codec testing i.e.:

Codec analog input connected to VX

Codec analog input disconnected from transmit filter output

Codec analog output connected to VR

VR disconnected from receive filter output

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