MPC9447FA Integrated Device Technology (Idt), MPC9447FA Datasheet - Page 7

• Manufacturer Part Number: MPC9447FA
• Description: Clock Driver 2-IN LVCMOS 32-Pin TQFP Tray
• Manufacturer: Integrated Device Technology (Idt)

Specifications of MPC9447FA

• Package: 32TQFP
• Configuration: 1 x 2:1
• Input Signal Type: LVCMOS
• Maximum Output Frequency: 350 MHz
• Maximum Quiescent Current: 2 mA
• Operating Supply Voltage: 2.5|3.3 V

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.
The Following Figures Illustrate the Measurement Reference for the MPC9447 Clock Driver Circuit
Figure 7. CCLK MPC9447 AC Test Reference for V
MPC9447 Data Sheet
MPC9447 REVISION 6 APRIL 13, 2010
Since this step is well above the threshold region, it will not cause
Generator
Z = 50Ω
Pulse
Z
O
= 50Ω
R
T
= 50Ω
V
TT
MPC9447 DUT
CC
= 3.3 V and V
Figure 6
Z
O
= 50Ω
7
CC
R
T
= 50Ω
= 2.5 V
V
TT
MPC9447
Figure 6. Optimized Dual Line Termination
Output
Buffer
17Ω
17Ω + 16Ω || 16Ω = 50Ω || 50Ω
3.3V, 2.5V, 1:9 LVCMOS CLOCK FANOUT BUFFER
25Ω = 25Ω
R
R
S
S
= 16Ω
= 16Ω
©2010 Integrated Device Technology, Inc.
Z
Z
O
O
= 50Ω
= 50Ω