PACNLT101 Datasheet, PDF (5/5 Pages) California Micro Devices Corp – NON-LINEAR HIGH SPEED TERMINATION IC

PACNLT101
Enable pin
In normal use the Enable pin is connected to V_DD.
If the Enable pin is set to 0V or disconnected (high
impedance), then the PACNLT101 will be disabled. The
supply current will drop to almost zero and the clamping
performance will be worsened.
The Enable pin can also be used to vary the supply
current and clamping voltage. As the current into the
Enable pin is increased the supply current will increase
and the clamping voltage will be reduced. The minimum
clamping voltage will occur when the Enable pin voltage
equals the supply voltage. (The Enable pin voltage
cannot exceed the supply voltage.)
Users who cannot tolerate the supply current quoted in
the Operating Characteristics can connect a resistor in
series with the Enable pin to reduce the supply current,
at the cost of increasing the clamping voltage. See
Figure 6.
The controller IC sets the powerdown pin to 0V to
powerdown the PACNLT101, and sets the powerdown
pin to V to power up the PACNLT101. The system
DD
designer can vary the value of R1 to optimize the trade-
off between power consumption and clamping voltage.
See Figure 7, 8, 9, and 10.
PACNLT101
R1
Enable
Controller
Powerdown
Figure 6. Resistor In Series with the Enable Pin
100
90
80
70
60
50
40
30
20
10
0
0
100
220
470
1000
Value of External Resistor R1 (Ω)
Figure 7. I vs R1 @ V = 3.3V
DD
DD
2200
800
750
700
650
600
550
500
0
100
220
470
1000
Value of External Resistor R1 (Ω)
2200
Figure 8. Clamping Voltage vs R1 @ V = 3.3V
DD
30
650
25
600
550
20
500
15
450
10
400
5
350
0
0 100 220 470 1000 2200 4700 10000 100000
Value of External Resistor R1 (Ω)
300
0
100 220 470 1000 2200 4700 10000 100000
Value of External Resistor R1 (Ω)
Figure 9. I_DD vs R1 @ V_DD = 2V
Figure 10. Clamping Voltage vs R1 @ V_DD = 2V
©2001 California Micro Devices Corp. All rights reserved. EZterm™ is a trademark of California Micro Devices
215 Topaz Street, Milpitas, California 95035  Tel: [phone]
Fax: [phone]
www.calmicro.com
3/8/2001
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