MITEL MH89626C-02, MH89626C-04 Datasheet



MH89626C

OPS/DID SLIC

Preliminary Information

Features

• Transformerless 2-4 wire conversion

• Const ant cu rrent wit h const ant voltage fallbac k
for long loops

• Long leng th cap ab ility (R

> 1850Ω)

Loop

• Input i m pedance

•200Ω + 560Ω // 0.1 µF (MH89626C-02)

•200Ω + 680Ω // 0.1 µF (MH89626C-04)

• Ring trip filter with auto ring trip

• Three relay driv ers

• Built-in Tip/Rin g reve rsal cap ab ility on the
hybrid

• Serial control interface

• Extern al or sof twar e progra mm able re ceive
gain, -3.5 or -7 .0dB

Applications

• Off-Premise PBX Line Cards

• DID (Direc t Inward Dial) Line Cards

• Centr al Offic e Line C ards

ISSUE 3 May 1995

Ordering Information

MH89626C-02 38 Pin SIL Package
MH89626C-04 38 Pin SIL Package

0°C to 70°C

Description

The MH89626C SLIC provides all of the functions
required to interface 2-wire off premise subscriber
loops to a serial TDM, PCM, switching network of a
modern PBX. The MH89626C is manufactured
using thick film hybrid technology which offers high
voltage capability, reliability and high density
resulting in significant printed circuit board area
saving of the line cards. A complete line card can
be implemented with very few external
components.

The SLIC has a simple serial control interface to
control the receive gain setting, relay drivers for
ringing, and Tip/Ring reversal for DID operation.

TF

TIP

RING

RF2

RF

VBat

LGND VDD VEE LCA AGND RGND VREF F1i C2i

Tip

Drive

2W/4W

Current

& Voltage

Sensing

Ring
Drive

Line

Supervision

LED SHK VAC VRLY RD1 RD2 RD3 SD5 SD6 SD7

Constant
Current &

Voltage
Control

Auto Ring
Trip Fil te r

Conversion

Gain

Adjust

Tip/Ring

Reversed

Relay

Drive 1

Relay

Driver 2

Filter/Codec

SD2

SD3

SD0

SD1

MT8967

A-Law

8-Bit
Shift
Register

SD4

Relay

Driver 3

Figure 1 - Functional Block Diagram

Do
Di

GS

CS

SDi

2-285

MH89626C Preliminary Information

TIP

RING

RF

TF

LPND

VBat

RF1
RF2

VEE

AGND

VDD

IC

VAC

IC

CS
SHK
LED
LCA
SD1

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19

VREF

D1

C2i

Do

F1i

IC
IC
IC

GS

IC
SD7
SD6
SD5

IC

VRLY

RGND

RD2
RD3
RD1

Figure 2 - Pin Connections

Pin Description

Pin # Name Description

1TIPTip Lead: Connects to the TIP lead of the telephone line.
2 RING Ring Lead: Connects to the Ring lead of the telephone line.

20
21

22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38

3RFRing Feed.
4TFTip Feed.
5 LGND Loop Ground: Return path for the battery (V

) supply voltage. Connects to System

Bat

Ground.

6V

Battery Supply Voltage: Normally -48V.

Bat

7RF1Ring Feed 1: Ringi ng input .
8RF2Ring Feed 2: Ring ing output.
9V

Negative Su pp ly Voltage. (-5V).

EE

10 AGND An al og Gr ou nd: Analog and Digital Ground. Connects to system ground.
11 V

Positive Su pp ly Voltage. (+5V).

DD

12 IC Internal Connection.
13 VAC Battery AC Component (input). AC noise present in the V

supply isolated from the DC

Bat

components, can be applied to this pin to reduce longitudinal noise on TIP and RING. To
implement this feature, connect a 0.1µF 100V capacitor from V

to VAC, and 1kΩ resistor

Bat

from VAC to AGND. This pin must be tied to AGND when not used.
14 IC Internal Connection.
15 CS

Chip Select (Input): A TTL compatible digit al inp ut to enable the SDi to control all t he

functions of the driver.
16 SHK Switch Hook Detect (Output): A logic low indicates an off-hook condition .
17 LED

LED Drive (Output).: Drives an LED directly through an internal 2.2kΩ resistor. A logic low

indicates an off-hook condition.
18 LCA L oo p Current Adj ust (in pu t): If this pin is left open, the constant current will be set at

23mA. The loop current can be adjusted by connecting a resistor to V

2-286

EE

.

Preliminary Information MH89626C

Pin Description (Continued)

Pin # Name Des crip tio n

19 SDi Serial Data in (input): A TTL compati ble digital input. The 8-bit serial input enables the

driver s. See Table 1 and Figure 3b.

20 V

Voltage Reference (Input) +2.5V for the internal codec.

Ref

21 Di D a ta in (Input) . A TTL compat ibl e digit al input which ac cepts the 8-bit PCM word from the

incoming PCM bu s.
22 C2i Clock input (in pu t). A TTl compatibl e digit al input which ac cepts the 2048 kHz clock.
23 Do Data Out (Output) A three state TTL compatib le digit al out put which drive s the 8-bit PC M

word to the outgoin g PCM bu s.
24 F1i

Synchroni zation input (Inp ut). A TTL compatible, active low digital output input enabling

the PCM input, PCM outp ut and digital control inpu t. It is internally sampled on every

positive edge of the clock, C2i and provides frame and channel synchronization. See fig

3a.

25-27 IC Internal Connection

.

28 GS Gain setting (Input). A logic ‘0’ at this input will set the receiving gain to -7.0dB and a logic

‘1’ will set the receiving gain to -3.5dB. If this pin is left open, the receiving gain can be set

by SDi, bit 2.
29 IC Internal Connection.
30 SD7 S e rial Data (Outpu t). A TTL compatible output comin g from the SDi, bit 7. Bit inverted.

31 SD6 Serial Data (O utput). A TTL compatible output comin g from the SDi, bit 6. Bit inverted.

32 SD5 S e rial Data (Outpu t). A TTL compatible output comin g from the SDi, bit 5. Bit inverted.
33 IC Internal Connection.
34 V

RLY

Relay Positive Supply Voltage. Normally +5V. Connects to the relay coil and the relay

supply voltage.
35 RGND Relay Ground. Return path for relay supply voltage.
36 RD2

Relay Driver 2 (Outpu t). Connects to a user provided external relay coil. A logic ‘0’

from the SDi, bit 1 will activate this driver. This relay driver is typically used for system

in-test.
37 RD3

Relay Driver 3 (Outpu t). Connects to a user provided external relay coil. A logic ‘0’

from the SDi, bit 4 will activate this driver. This relay driver is typically used for system

in-test.
38 RD1

Relay Driver 1 (Outp ut). Connects to a user provided external relay coil. A logic ‘0’ from

the SDi, bit 0 will activate this driver. This relay driver is typically used for ringing.

2-287

MH89626C Preliminary Information

Absolute Maximum Ratings*- All voltages are with respect to AGND unless otherwise specified.

Parameter Symbol Min Max Units

1 DC Supply Voltage V

2 DC Battery Voltages ➀ V
3 DC Ring Relay Voltage V
4 DC Reference Volt age V

V

DD
EE

Bat
RLY
REF

-0.3

0.3

0.3 -65 V

-0.3 7 V

-0.3 V

7

-7

DD

5 AC Ring Generator Voltage 150 V
6 DC Digital Input Voltage GS,SDi,Di,

-0.3 V

DD

C2i,F 1 i

7 Storage Temperature TS -40 +125 °C

* Exceeding these values ma y cause perm anen t dama ge. Functi onal operati on und er these cond ition s is not implied.

Recommended Operating Conditions

Parameter Symbol Min TYP* Max Units Comments

1 DC Supply Voltage V

2 DC Battery Volt age ➀ V
3 DC Ring Relay Voltag e V
4 DC Reference Voltage ② V
5 AC Ring Generator Vol tage

Ringing Generator Frequency

6 Operating Temperature T

V

DD
EE

Bat

RLY

REF

OP

4.75

-4.75

5.0

-5.0

5.25

-5.25

V
V

-39.8 -48 -60 V

5.0 7.0 V

2.488 2.500 2.512 V
22 90

25

130

28

V

RMS

Hz

02570°C

V
V

V

RMS

V

➀ LGND is c o nn ec te d t o AGND
② Temperat ure coefficient of V

should be better than 100ppm/C

REF

2-288