PCK946BD,151 NXP Semiconductors, PCK946BD,151 Datasheet - Page 7

• Manufacturer Part Number: PCK946BD,151
• Description: IC DRVR CLK CMOS 1:10 32LQFP
• Manufacturer: NXP Semiconductors
• Type: Fanout Buffer (Distribution), Divider, Multiplexerr

Specifications of PCK946BD,151

• Number Of Circuits: 1
• Ratio - Input:output: 2:10
• Differential - Input:output: No/No
• Input: LVCMOS, LVTTL
• Output: CMOS
• Frequency - Max: 150MHz
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 32-LQFP
• Frequency-max: 150MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935281249151; PCK946BD-S; PCK946BD-S

Philips Semiconductors
9397 750 12296
Product data sheet
At the load end the voltage will double, due to the near unity reflection coefficient, to 2.8 V.
It will then increment towards the quiescent 3.0 V in steps separated by one round trip
delay (in this case 4.0 ns).
Since this step is well above the threshold region it will not cause any false clock
triggering, however designers may be uncomfortable with unwanted reflections on the
line. To better match the impedances when driving multiple lines the situation in
should be used. In this case the series terminating resistors are reduced such that when
the parallel combination is added to the output buffer impedance the line impedance is
perfectly matched.
SPICE level output buffer models are available for engineers who want to simulate their
specific interconnect schemes. In addition IV characteristics are in the process of being
generated to support the other board level simulators in general use.
Fig 4. Single versus dual waveforms
Fig 5. Optimized dual line termination
7
25
+ 36
= 25
36
voltage
Rev. 01 — 13 December 2005
(V)
3.0
2.0
1.0
0.5
= 50
IN
0
0
50
PCK946
OUTPUT
IN
BUFFER
4
7
R o
OutA
t
OutB
t
d
d
R s = 36
R s = 36
8
= 3.8956 ns
= 3.9386 ns
Low voltage 1 : 10 CMOS clock driver
12
Z o = 50
Z o = 50
Z o = 50
time (ns)
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© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
002aaa680
16
PCK946
Figure 5
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