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ICS853052AGT Datasheet(PDF) 8 Page - Integrated Circuit Systems |
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ICS853052AGT Datasheet(HTML) 8 Page - Integrated Circuit Systems |
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8 / 13 page  853052AG www.icst.com/products/hiperclocks.html REV. A JULY 1, 2004 8 Integrated Circuit Systems, Inc. ICS853052 DUAL LVCMOS / LVTTL-TO-DIFFERENTIAL 2.5V, 3.3V, 5V LVPECL MULTIPLEXER PRELIMINARY The clock layout topology shown below is a typical termina- tion for LVPECL outputs. The two different layouts mentioned are recommended only as guidelines. FOUT and nFOUT are low impedance follower outputs that gen- erate ECL/LVPECL compatible outputs. Therefore, terminating resistors (DC current path to ground) or current sources must be used for functionality. These outputs are designed to drive 50 Ω transmission lines. Matched impedance techniques should be used to maximize operating frequency and minimize signal distortion. Figures 2A and 2B show two different layouts which are recommended only as guidelines. Other suitable clock lay- outs may exist and it would be recommended that the board designers simulate to guarantee compatibility across all printed circuit and clock component process variations. TERMINATION FOR 3.3V LVPECL OUTPUTS FIGURE 2B. LVPECL OUTPUT TERMINATION FIGURE 2A. LVPECL OUTPUT TERMINATION V CC - 2V 50 Ω 50 Ω RTT Z o = 50Ω Z o = 50Ω FOUT FIN RTT = Z o 1 ((V OH + VOL) / (VCC – 2)) – 2 3.3V 125 Ω 125 Ω 84 Ω 84 Ω Z o = 50Ω Z o = 50Ω FOUT FIN TERMINATION FOR 5V LVPECL OUTPUT This section shows examples of 5V LVPECL output termina- tion. Figure 3A shows standard termination for 5V LVPECL. The termination requires matched load of 50 Ω resistors pull down to Zo = 50 Ohm R2 50 Zo = 50 Ohm 5V 3V PECL + - R1 50 5V PECL R4 84 5V Zo = 50 Ohm R3 84 R2 125 5V PECL PECL + - Zo = 50 Ohm R1 125 FIGURE 3A. STANDARD 5V PECL OUTPUT TERMINATION FIGURE 3B. 5V PECL OUTPUT TERMINATION EXAMPLE V CC - 2V = 3V at the receiver. Figure 3B shows Thevenin equiva- lence of Figure 3A. In actual application where the 3V DC power supply is not available, this approached is normally used. |
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