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XR-T5680 Datasheet Preview

XR-T5680 Datasheet

PCM Line Interface Chip

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XR-T5680
PCM Line Interface Chip
GENERAL DESCRIPTION
The XR-T5680 is a PCM line interface chip. It consists of
both transmit and receive circuitry in a OIL 18 pin pack-
age. The maximum bit rate the chip can handle is 10 M
Bits/s and the signal level to the receiver can be attenuated
by -10 dB cable loss at half the bit rate. Total current
consumption is between 27-46 mA at +5.0 V.
FUNCTIONAL BLOCK DIAGRAM
r-----fl7lTX DATA + 'iP
FEATURES
Single +5.0 V Supply
Receiver Input Can Be Either Balanced or Unbalanced
Up to 10 MBits/s Operation
TTL Compatible Interface
ORDERING INFORMATION
Part Number
XR-T5680
Package
Ceramic
Operating Temperature
O°C to 70°C
APPLICATIONS
T1, T1C, T148C, T2, 2048 & 8448 KBits/s
PCM Line Interface
CPI
OMI
ABSOULTE MAXIMUM RATINGS
Supply Voltage
Storage Temperature
Operating Temperature
+20 V
-65°C to +150°C
O°C to 70°C
SYSTEM DESCRIPTION
The incoming bipolar PCM signal which is attenuated and
distorted by the cable is applied to the threshold compara-
tor and the peak detector. The peak detector generates a
DC reference for the threshold comparator for data and
clock extraction. A tank circuit tuned to the appropriate
frequency is added to the later operation. The clock signal,
data + data - all go through a similar level shifter to be
converted into TTL level to be compatible for digital
processing.
In the transmit direction, the output drivers consist of two
identical TTL inputs with open collector output stages.
The maximum low level current these output stages can
sink is 40.0 mAo With full width data applied to the inputs
together with a synchronized clock. The output will gene-
rate a bipolar signal when driving a centre-tapped trans-
former. A typical circuit diagram to XR-T5680 is shown in
Figure 1, and the DC characteristics are indicated in the
Electrical Characteristics chart.
2-15




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XR-T5680 Datasheet Preview

XR-T5680 Datasheet

PCM Line Interface Chip

No Preview Available !

XR-T5680
ELECTRICAL CHARACTERISTICS
Test Conditions: +VCC = 5.0 V. TA =0° - 70°C. unless specified otherwise.
PARAMETERS
MIN TYP MAX UNIT
DC Supply
+4.75 +5.0 +5.25
V
Supp Iy Current
35.0
46.0
mA
Tank Drive Current
1.5 2.0 2.5 mA
*C/ock Output/Low Level
0.4 0.8
V
*C/ock Output/High Level
3.0 3.6
V
*Data Output/Low Level
0.4 0.8
V
*Data Output/High Level
3.0 3.6
V
Output Driver/Low Lev~.1
0.6
0.95
V
Output Driver Current S!nk
40 mA
Output Driver Rise Time
20 25 ns
Output Driver Fall Time
20 25 ns
*These output terminals are LS-TTL compatible.
CONDITIONS
Output Drivers Opens
Measured at Pin 4
Measured at Pin 8.
'OL = 1.0 mA
Measured at Pin 8
IOH =-400pA
Measured at Pins 10.11
IOL = 1.0 mA
Measured at Pins 10.11
10H =-400pA
Measured at Pins 13.15
IOL = 40 mA
Measured at Pins 13.15
VOL =0.95 V
Measured at Pins 13.15
with 150n Pull-up to +5.0 V
CL=15pF
Measured at Pins 13.15
with 150n Pull-up to +5.0 V
CL = 15 pF
Figure 2. A recommended Circuit Diagram
2-16


Part Number XR-T5680
Description PCM Line Interface Chip
Maker Exar
Total Page 2 Pages
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