B9946

Features:

• 160-MHz Clock Support
• LVCMOS/LVTTL Compatible Inputs
• 10 Clock Outputs: Drive up to 20 Clock Lines
• 1X or 1/2X Configurable Outputs
• Output Three-state Control
• 250 ps Maximum Output-to-Output Skew
• Pin Compatible with MPC946
• Industrial Temp. Range: 40°C to +85°C
• 32-Pin TQFP Package


Pinout




Specifications

Maximum Input Voltage Relative to V_SS: ...........  VSS 0.3V
Maximum Input Voltage Relative to V_DD: ............VDD + 0.3V
Storage Temperature: ...............................65to + 150
Operating Temperature: ..............................40 to +85
Maximum ESD Protection.............................................. 2 KV
Maximum Power Supply: ...............................................5.5V
Maximum Input Current:...........................................±20 mA


Description

The B9946 is a low-voltage clock distribution buffer with the capability to select one of two LVCMOS/LVTTL compatible in-put clocks. These clock sources can be used to provide for test clocks as well as the primary system clocks. All other control inputs are LVCMOS/LVTTL compatible. The 10 outputs are 3.3V LVCMOS or LVTTL compatible and can drive two series terminated 50Ω transmission lines. With this capability the B9946 has an effective fanout of 1:20.

The B9946 is capable of generating 1X and 1/2X signals from a 1X source. These signals are generated and retimed inter-nally to ensure minimal skew between the 1X and 1/2X sig-nals. SEL(A:C) inputs allow flexibility in selecting the ratio of 1X to1/2X outputs.

The B9946 outputs can also be three-stated via MR/OE# in-put. When MR/OE# is set HIGH, it resets the internal flip-flops and three-states the outputs.