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NWK954
14
AC ELECTRICAL CHARACTERISTICS
Recommended Operating Conditions apply except where otherwise stated
TXCLK and RESET_N
Typ. Max.
TXCLKIN
Frequency
Duty cycle
RESET_N
Pulse width
55
-
MHz
%
ns
Units
Conditions
Characteristic
Value
25 ± 100ppm
-
f
TCLK
t
WRES
Symbol
Min.
45
100
TXOP/TXON
The differential output voltage shall be in the range 950mV to 1050mV.
The differential overshoot shall not exceed 5%.
Overshoot transients must decay to within 1% of the steady state voltage within 8ns of the start of the
differential signal transition.
The signal amplitude symmetry shall be in the range 98% to 102%.
The return loss shall be greater than 16dB from 2MHz to 30MHz.
The return loss shall be greater than 16-20 log(f/30MHz)dB from 30MHz to 60MHz
The return loss shall be greater than 10dB from 60MHz to 80MHz.
The rise and fall times measured from 10% to 90% of the steady state output voltage shall be between
3ns and 5ns.
Difference between max. and min. rise and fall times shall be less than 0·5ns.
Duty cycle distortion must be less than 60·25ns measured at 50% of the steady state output voltage for
a data sequence of 01010101 (NRZ)
Total transmit jitter, including duty cycle distortion and baseline wander, must be less than 1·4ns p-p
TP-PMD 9.1.2.2
TP-PMD 9.1.3
TP-PMD 9.1.3
TP-PMD 9.1.4
TP-PMD 9.1.5
TP-PMD 9.1.5
TP-PMD 9.1.5
TP-PMD 9.1.6
TP-PMD 9.1.6
TP-PMD 9.1.8
TP-PMD 9.1.9
ReferenceCharacteristic
RXIP/RXIN
The return loss shall be greater than 16dB from 2MHz to 30MHz.
The retum loss shall be greater than 16-20 log(f/30MHz)dB from 30MHz to 60MHz.
The return loss shall be greater than 10dB from 60MHz to 80MHz
Characteristic
TP-PMD 9.2.2
TP-PMD 9.2.2
TP-PMD 9.2.2
Reference
EXTERNAL COMPONENTS (See Fig. 8)
Component
DescriptionValue
Tol.
1%
1%
1%
1%
5%
5%
5%
Receiver impedance matching resistor network.
Receiver impedance matching resistor network.
Transmitter load resistors.
Sets the transmitter output current.
This resistor is required even if the RESET_N signal is not used externally.
Optional pull-downs on backplane enable signals. These outputs are normally active low.
Each output can be independently changed to active high by the addition of this resistor.
Pull-ups required on open drain expansion port outputs.
Series resistors. May be required in some applications where the expansion ports are used.*
R1
R2
R3
R4
R5
R6
R7
R8
C1, C3
C2
16·2Ω
34·0Ω
50Ω
1·2kΩ
5kΩ
10kΩ
200Ω min*
0·01µF
0·1µF
* Refer to Mitel
Table 10