VSC852(2000) 查看數據表（PDF） - Vitesse Semiconductor
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VSC852 Datasheet PDF : 16 Pages
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VITESSE
SEMICONDUCTOR CORPORATION
1.6Gb/s 64x64
Crosspoint Switch
Functional Diagram
Datasheet
VSC852
Functional Description
Input/Output Characteristics
All input data must be differential and biased to PECL levels. On-chip terminations are provided, with a
nominal impedance of 50Ω. All input termination resistors are tied to VTERM. To minimize power dissipation,
the VTERM supply should be biased within ±100mV of the input common-mode voltage (nominally 2.0V). The
VTERM supply can be biased below the input common-mode voltage at the expense of increased on-chip power
dissipation.
Data outputs are provided through differential current switches with on-chip back-terminations. The drive
level of the output circuit is designed to handle external 50Ω termination. Although external termination is not
required for correct functional operation, it is strongly recommended to assure proper signal levels and mini-
mize reflections.
Programming Interface
The switch core is programmed through a serial interface circuit that allows sequential reads or writes to
the program memory array. The program memory array is buffered to allow multiple programming instructions
to be loaded simultaneously with the CONFIG pin.
The program data is composed of two parts: output pin address and input pin address. The output pin
address, denoted by A0 through A6, specifies which output channel is to be programmed. Address bit A6 is
reserved for future expansion. The input pin address, denoted by D0 through D5, specifies which input port the
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© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
Tel: (800)-VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
G52245-0, Rev 4.1
9/26/00
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