파트넘버.co.kr XR-T56L85 데이터시트 PDF


XR-T56L85 반도체 회로 부품 판매점

Low Power PCM Line Interface



Exar Corporation 로고
Exar Corporation
XR-T56L85 데이터시트, 핀배열, 회로
...the analog plus companyTM
XR-T56L85
Low Power
PCM Line Interface
FEATURES10
D Low Power (Typical 14mA)
D Single +5V Supply
D Up to 2.048 Mbps Operation in Both TX and RX
Directions
D Receiver Input can be:
– Balanced Transformer Coupled
– Capacitively (Twisted Pair)
– Single Coaxial Capacitive Coupling
APPLICATIONS
D T1 and CEPT Interfaces
D CPI
D DMI
June 1997-3
GENERAL DESCRIPTION
The XR-T56L85 is a PCM line interface chip. It consists of
both transmit and receive circuitry in a DIL 18 pin
package. The maximum bit rate the chip can handle is
2.048 Mbps and the signal level to the received can be
attenuated by 10dB of cable loss at half the bit rate. Total
current consumption is between 12-16mA at +5V.
ORDERING INFORMATION
Part No.
XR-T56L85N
XR-T56L85D
Package
18 Lead 300 Mil CDIP
18 Lead 300 Mil JEDEC SOIC
Operating
Temperature Range
-40°C to +85°C
-40°C to +85°C
BLOCK DIAGRAM
RXDATA+ 2
RXDATA- 3
RXVCC 9
RXGND 7
TXVCC 18
TPOS 17
TCLK 16
TNEG 12
TXGND 14
Peak
Detector
Bias
PDC
1
Positive
Threshold
Comparator
+
Negative
Threshold
Comparator
+
Bias
TTL Buffer
11 RPOS
TTL Buffer
8 RCLK
4 TE
TTL Buffer
10 RNEG
6 TANK BIAS
TTL Buffer
TTL Buffer
5 BIAS
15 TXDATA+
13 TXDATA-
Figure 1. Block Diagram
Rev. 2.01
E1992
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 z (510) 668-7000 z FAX (510) 668-7017
1


XR-T56L85 데이터시트, 핀배열, 회로
XR-T56L85
PIN CONFIGURATION
PDC
RXDATA+
RXDATA-
TE
BIAS
TANK BIAS
RXGND
RCLK
RXVCC
1
2
3
4
5
6
7
8
9
18 TXVCC
17 TPOS
16 TCLK
15 TXDATA+
14 TXGND
13 TXDATA-
12 TNEG
11 RPOS
10 RNEG
18 Lead CDIP (0.300”)
PDC
RXDATA+
RXDATA-
TE
BIAS
TANK BIAS
RXGND
RCLK
RXVCC
1 18
2 17
3 16
4 15
5 14
6 13
7 12
8 11
9 10
TXVCC
TPOS
TCLK
TXDATA+
TXGND
TXDATA-
TNEG
RPOS
RNEG
18 Lead SOIC (Jedec, 0.300”)
PIN DESCRIPTION
Pin # Symbol
1 PDC
2 RXDATA+
3 RXDATA-
4 TE
5 BIAS
6 TANK BIAS
7 RXGND
8 RCLK
9 RXVCC
10 RNEG
11 RPOS
12 TNEG
13 TXDATA-
14 TXGND
15 TXDATA+
16 TCLK
17 TPOS
18 TXVcc
Type
I
I
O
O
O
O
O
I
O
O
I
I
Description
Peak Detector Capacitor. This pin should be connected to a 0.1µF capacitor
Receive Analog Input Positive. The AMI signal received from the line is applied at this and
the RX DATA(-) pin. Data and clock from the signal applied at these two pins recovered and
output on the RPOS, RNEG, and RCLK pins, respectively.
Receive Analog Input Negative. See the description for RX DATA(+).
LC Tank Excitation Output. This output connects to one side of the tank circuitry.
Bias. This pin should be tied to ground through a 0.1µF capacitor.
Tank Reference. The tank circuitry is biased via this output.
Receiver Ground. To minimize ground interference a separate pin is used to ground the re-
ceiver section.
Recovered Receive Clock. Recovered clock signal from the AMI signal received at the RX
DATA(+) and RX DATA(-) pins. This signal is output to the terminal equipment.
Receive Supply Voltage. 5V supply voltage for the Receive Section.
Receive Negative Data Output. A signal at this pin corresponds to the receipt of a negative
pulse on the RX DATA(+)/RX DATA(-) pins. This TTL compatible signal is output to the
terminal equipment.
Receive Positive Data Output. A signal at this pin corresponds to the receipt of a positive
pulse on the RX DATA(+)/RX DATA pins. This TTL compatible signal is outputed to the
terminal equipment.
Transmit Negative Data Input. TTL input for a negative polarity pulse (the negative portion
of the AMI pulse train) to be transmitted to the line via the TX DATA(+) and TX DATA pins.
Transmit Negative Data Output. This pin, along with the TX DATA(+) pin, forms a differential
driver output, this is used to drive AMI data down the line via a transformer. Note: This is an
open-collector output.
Transmit Ground.
Transmit Positive Data Output. Please see description for TX DATA(-).
Transmit Clock. TPOS and TNEG are sampled on the rising edge of TCLK.
Transmit Positive Data Input. TTL input for a positive polarity pulse (the positive portion of
the AMI pulse train) to be transmitted to the line via the TX DATA(+) and TX DATA(-) pins.
Transmit Supply Voltage. 5V supply voltage to the transmit section.
Rev. 2.01
2




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XR-T56L85

Low Power PCM Line Interface - Exar Corporation