®
MH89626C
OPS/DID SLIC
Preliminary Information
Features
•
•
•
•
•
•
•
•
•
•
•
Transformerless 2-4 wire conversion
Constant current with constant voltage fallback
for long loops
Long length capability (R
Loop
> 1850Ω)
Input impedance
200Ω + 560Ω // 0.1µF (MH89626C-02)
200Ω + 680Ω // 0.1µF (MH89626C-04)
Ring trip filter with auto ring trip
Three relay drivers
Built-in Tip/Ring reversal capability on the
hybrid
Serial control interface
External or software programmable receive
gain, -3.5 or -7.0dB
MH89626C-02
MH89626C-04
ISSUE 3
May 1995
Ordering Information
38 Pin SIL Package
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.
Applications
•
•
•
Off-Premise PBX Line Cards
DID (Direct Inward Dial) Line Cards
Central Office Line Cards
LGND
TF
TIP
Tip
Drive
VDD
VEE
LCA
AGND
RGND
VREF
F1i
C2i
2W/4W
Conversion
Current
& Voltage
Sensing
Constant
Current &
Voltage
Control
Gain
Adjust
MT8967
A-Law
Filter/Codec
Do
Di
GS
SD2
SD3
SD0
SD1
Relay
Driver 2
RING
RF2
RF
VBat
Ring
Drive
Tip/Ring
Reversed
8-Bit
Shift
Register
SD4
Relay
Driver 3
CS
SDi
Auto Ring
Line
Supervision
Trip Filter
Relay
Drive 1
LED
SHK
VAC
VRLY
RD1
RD2
RD3
SD5 SD6 SD7
Figure 1 - Functional Block Diagram
2-285
MH89626C
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
Preliminary Information
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
Figure 2 - Pin Connections
Pin Description
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
Name
TIP
RING
RF
TF
LGND
V
Bat
RF1
RF2
V
EE
AGND
V
DD
IC
VAC
Description
Tip Lead:
Connects to the TIP lead of the telephone line.
Ring Lead:
Connects to the Ring lead of the telephone line.
Ring Feed.
Tip Feed.
Loop Ground:
Return path for the battery (V
Bat
) supply voltage. Connects to System
Ground.
Battery Supply Voltage:
Normally -48V.
Ring Feed 1:
Ringing input.
Ring Feed 2:
Ringing output.
Negative Supply Voltage.
(-5V).
Analog Ground:
Analog and Digital Ground. Connects to system ground.
Positive Supply Voltage.
(+5V).
Internal Connection.
Battery AC Component (input).
AC noise present in the V
Bat
supply isolated from the DC
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
Bat
to VAC, and 1kΩ resistor
from VAC to AGND. This pin must be tied to AGND when not used.
Internal Connection.
Chip Select (Input):
A TTL compatible digital input to enable the SDi to control all the
functions of the driver.
Switch Hook Detect (Output):
A logic low indicates an off-hook condition.
LED Drive (Output).:
Drives an LED directly through an internal 2.2kΩ resistor. A logic low
indicates an off-hook condition.
Loop Current Adjust (input):
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
EE
.
14
15
16
17
18
IC
CS
SHK
LED
LCA
2-286
Preliminary Information
Pin Description (Continued)
Pin #
19
20
21
22
23
24
Name
SDi
V
Ref
Di
C2i
Do
F1i
Description
MH89626C
Serial Data in (input):
A TTL compatible digital input. The 8-bit serial input enables the
drivers. See Table 1 and Figure 3b.
Voltage Reference (Input)
+2.5V for the internal codec.
Data in (Input).
A TTL compatible digital input which accepts the 8-bit PCM word from the
incoming PCM bus.
Clock input (input).
A TTl compatible digital input which accepts the 2048 kHz clock.
Data Out (Output)
A three state TTL compatible digital output which drives the 8-bit PCM
word to the outgoing PCM bus.
Synchronization input (Input).
A TTL compatible, active low digital output input enabling
the PCM input, PCM output and digital control input. It is internally sampled on every
positive edge of the clock, C2i and provides frame and channel synchronization. See fig
3a.
Internal Connection
.
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.
Internal Connection.
Serial Data (Output).
A TTL compatible output coming from the SDi, bit 7. Bit inverted.
Serial Data (Output).
A TTL compatible output coming from the SDi, bit 6. Bit inverted.
Serial Data (Output).
A TTL compatible output coming from the SDi, bit 5. Bit inverted.
Internal Connection.
Relay Positive Supply Voltage.
Normally +5V. Connects to the relay coil and the relay
supply voltage.
Relay Ground.
Return path for relay supply voltage.
Relay Driver 2 (Output).
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.
Relay Driver 3 (Output).
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.
Relay Driver 1 (Output).
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.
25-27
28
IC
GS
29
30
31
32
33
34
35
36
IC
SD7
SD6
SD5
IC
V
RLY
RGND
RD2
37
RD3
38
RD1
2-287
MH89626C
Parameter
1
2
3
4
5
6
7
DC Supply Voltage
DC Battery Voltages
DC Ring Relay Voltage
DC Reference Voltage
AC Ring Generator Voltage
DC Digital Input Voltage
Storage Temperature
GS,SDi,Di,
C2i,F1i
TS
Symbol
V
DD
V
EE
V
Bat
V
RLY
V
REF
Preliminary Information
Absolute Maximum Ratings*-
All voltages are with respect to AGND unless otherwise specified.
Min
-0.3
0.3
0.3
-0.3
-0.3
-0.3
-40
Max
7
-7
-65
7
V
DD
150
V
DD
+125
Units
V
V
V
V
V
V
RMS
V
°C
* Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied.
Recommended Operating Conditions
Parameter
1
2
3
4
5
6
DC Supply Voltage
DC Battery Voltage
DC Ring Relay Voltage
DC Reference Voltage
y
AC Ring Generator Voltage
Ringing Generator Frequency
Operating Temperature
T
OP
Symbol
V
DD
V
EE
V
Bat
V
RLY
V
REF
2.488
22
0
Min
4.75
-4.75
-39.8
TYP*
5.0
-5.0
-48
5.0
2.500
90
25
25
Max
5.25
-5.25
-60
7.0
2.512
130
28
70
Units
V
V
V
V
V
V
RMS
Hz
°C
Comments
LGND is connected to AGND
y
Temperature coefficient of V
REF
should be better than 100ppm/C
2-288
Preliminary Information
DC Electrical Characteristics*
Characteristics
1
Supply and Battery Current
MH89626C
Sym
I
DD
I
EE
I
Bat
I
Bat
PC
100
150
1500
2
V
OL
V
OH
V
OL
V
OH
I
OL
I
CD
V
IL
V
IH
I
IL
I
IH
I
IL
I
IM
I
IH
V
OL
V
OH
I
OZ
V
IL
V
IH
I
IL
I
IH
4.0
0.1
0.8
2.4
10
10
-0.3
3.7
2.0
65
100
0.8
2.0
1
1
10
10
10
0.4
0
5
0.5
5.25
3.0
mW
mW
mW
µA
V
V
V
V
mA
mA
V
V
µA
µA
µA
µA
V
V
mA
V
V
µA
µA
V
IL
= 0V
V
IH
= 5.0V
V
IL
= 0V
V
IH
= 5.0V
V
IL
= 5.0V
V
IM
= 0.5V
V
IH
= 5.0V
I
OL
= 1.6mA
I
OH
= 0.1mA
I
OL
= 2mA
I
OH
= 2mA
I
OL
= 1.1mA
I
OH
= 0.7mA
V
OL
= 1.0V
R
Loop
= Open
R
Loop
= 0Ω
Min
5
5
Typ
†
12.5
11.7
23.5
1.5
Max
15
15
28
2
Units
mA
mA
mA
mA
Test Comments
Short Loop
Open Loop
2
Power Consumption
On Hook (V
Bat
)
Powerdown (V
DD
and V
EE
)
Off-Hook (V
DD
, V
EE
, V
Bat
)
V
Ref
SHK
LED
DC Reference Voltage
Mean Current
Low Level Output Voltage
High Level Output Voltage
Low Level Output Voltage
y
High Level Output Voltage
Sink Current, Relay to V
DD
Clamp Diode Current
Low Level Input Voltage
High Level Input Voltage
GS
Low Level Input Current
High Level Input Current
Low Level Input Current
Intermediate Input Current
High Level Input Current
Low Level Output Voltage
High Level Output Voltage
Tri-State Leakage Current
Low Level Input Current
High Level Input Voltage
Low Level Input Current
High Level Input Current
R
Loop
= 0Ω, LCA =Open
R
Loop
= Open
0
3
4
5
6
RD1
RD2
RD3
7
8
9
SDi
RD
Do
10
11
12
SDi
Di
C2i
F1i
* DC Electrical Characteristics are over Recommended Operating Conditions with V
DD
at + 5.0V + 5% unless otherwise stated.
† Typical figures are at 25°C with nominal + 5V supplies and are for design aid only.
x
Supply current and power consumption characteristics are over Recommended Operating Conditions with V
DD
at 5.0V, V
EE
at -5.0V
and V
Bat
at -48.0V.
y
The LED output consists of a 2.2K
Ω
resistor in series with the SHK HCT output.
2-289
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