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MJ1440 Datasheet Preview

MJ1440 Datasheet

HDB3 ENCODER/DECODER

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MJ1440
2 MBIT PCM SIGNALLING CIRCUIT
MJ1440
HDB3 ENCODER/DECODER
The 2.048 MBit PCM Signalling Circuits comprise a group
of circuits which will perform the common signalling and
error detection functions for a 2.048 MBit PCM trans-
mission link operating to the appropriate CCITT recomm-
endations. The circuits are fabricated in N-channel metal
gate MOS and operate from a single 5 volt supply, relevant
inputs and outputs are TTL compatible.
The MJ 1440 is an encoder/decoder for the pseudo-
ternary transmission code, HDB3 (CCITT Orange Book Vol
111.2 Annex to Rec. G703). The device encodes and de-
codes simultaneously and asynchronously. Error monitor-
ing functions are provided to detect violations of HDB3
coding, all ones detection and loss of input (all zeroes de-
tection). In addition a loop back function is provided for
terminal testing.
NRZ DATA IN 1
CLOCK (ENCODER) 1
LOSS OF INPUT 3
NRZ DATA OUT 4
CLOCK (DECODER) 5
11 LOOP TEST ENABLE
RESETAIS 6
~7
GROUND L8..-_ _..9... ERROR
DG16
Fig. 1 Pin connections
FEATURES
• 5v ± 5% Supply -50mA Max
• HDB3 Encoding and Decoding to CCITT rec.
G703.
• Asynchronous Operation.
• Simultaneous Encoding and Decoding.
• Clock Recovery Signal Generated from
Incoming HDB3 Data.
• Loop Back Control.
• HDB3 Error Monitor
• 'All Ones' Error Monitor
• Loss of Input Alarm (All Zeros Detector).
• Decode Data in NRZ Form.
ABSOLUTE MAXIMUM RATINGS
The absolute maximum ratings are limiting values above
which operating life may be shortened or specified para-
meters may be degraded.
Electrical Ratings
+Vcc
Inputs
Outputs
7V
Vcc + 0.5V Gnd - 0.3V
Vce, Gnd -0.3V
Thermal Ratings
Max Junction Temperature 175°C
Thermal Resistance: Chip to Case
40°C/Watt
Chip to Amb.
120°C/Watt
NRZ DATA IN
CLOCK
(ENCODER)
LOOP TEST
ENABLE
AIN
BiN
CLOCK
(DECODER)
RESET loiS o - - - - - o p j
CLOCK
01
02
LOSS OF
INPUT
NRZ
DATA
OUT
ERROR
1--------<> loiS
Fig. 2 Block diagram
23




Plessey

MJ1440 Datasheet Preview

MJ1440 Datasheet

HDB3 ENCODER/DECODER

No Preview Available !

MJ1440
ELECTRICAL CHARACTERISTICS
Test conditions (unless otherwise stated):
Supply voltage, Vee = 5V ±0.25V
Ambient temperature, lamb = O°C to + 70°C
Static characteristics
Characteristic
Symbol
Pins
Low level input voltage
V ,L
Value
Min Typ Max
-0.3
0.8
Low level input current
1,2,5,6
I'L
10,11,12,13
50
High level input voltage
V1H
2.5
Vee
High level input current
I'H
50
Low level output voltage
VOL
10,14,15
0.5
3,4,7,9
0.4
High level output voltage
VOH 3,4,7,9
2.7
14,15
2.8
10
2.8
Supply current
Icc
20
50
Units
V
IJA
V
IJA
V
V
V
V
V
mA
Conditions
VIL = OV
VIH = 5V
Isink = 80IJA
Isink = 1.6mA
Isource = 60IJA
Isource = 2mA
Isource = 1mA
All inputs to OV
All outputs open circuit
Dynamic Characteristics
Characteristic
Symbol
Value
Min. Typ. Max.
Units
Conditions
Max. Clock (Encoder) frequency
Max. Clock (Decoder) frequency
fmaxenc 4.0
fmaxdec 2.2
MHz Figs.10, 15
MHz Figs.11,15
Propagation delay Clock (Encoder) to 0 1, O2
Rise and Fall times 0 1, 02
tpd1A·tpd1B
tpd1A1B
100 ns Figs.10, 15. See Note 1
20 ns Figs.10, 15
20 ns Figs.10, 15
Propagation delay Clock (Encoder) to Clock
tpd3
150 ns Loop test enable = Figs.13, 15
Setup time of NRZ data in to Clock (Encoder)
ts3 30
ns Figs.8, 10, 15
Hold time of NRZ data in
th3 55
ns Figs.10, 15
Propagation delay A1n, Bin to Clock
Propagation delay Clock (Decoder) to loss of input
tpd2
150 ns Loop test enable = '0' Figs.9, 13, 15
150 ns
Propagation delay Clock (Decoder) to error
tpd4
200 ns Figs.12,15
Propagation delay Reset AIS to AIS
tpd5
200 ns Loop test enable = '0' Figs.14, 15
Propagation delay Clock (Decoder) to NRZ data out tpd6
150 ns Figs.9, 11, 15. See Note 2
Setup time of Aln , Bin to Clock (Decoder)
ts1 75
ns Figs.9, 11, 15
Hold time of Aln, Bin to Clock (Decoder)
= Hold time of Reset AIS '0'
th1 5
th2 100
ns Figs.9,11,15
ns Figs.9, 14, 15
Setup time Clock (Decoder) to Reset AIS
Setup time Reset Als - 1 to Clock (Decoder)
ts2 200
ts2 0
ns Flgs.9, 14, 15
ns Flgs.14,15
NOTES
1. Encoded HDB3 outputs (0" O2) are delayed by 3'12 clock periods from NRZ data in (Fig.3).
2. The decoded NRZ output is delayed by 3 clock periods from the HDB3 inputs (AIN, BIN) (Fig.4).
24


Part Number MJ1440
Description HDB3 ENCODER/DECODER
Maker Plessey
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MJ1440 Datasheet PDF






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