VSC830QZ datasheet(4/18 Pages) VITESSE

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VITESSE

SEMICONDUCTOR CORPORATION

Data Sheet

VSC830

2.7Gb/s Asynchronous

Dual 2x2 Crosspoint Switch

2.7Gb/s Asynchronous

Page 4

G52192-0, Rev 4.0

05/23/01

Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com

Internet: www.vitesse.com

Power-Down

Power to each output stage is provided through VCC, VCCP, and VEE. VCC is common to all outputs. To

power off unused outputs, tie the respective VEE and VCCP pin to VCC, as shown in Figure 2.

Figure 2: Power-Down Mode Example

Minimum power configuration requires output channel 1A active, so power must be applied to VCCP1A

and VEE1A at all times.

Programmable input termination

Across each differential input (from the + input to the - input) of the VSC830 is a switched 100

Ω termina-

tion resistor. Using the TERM_ENABLE pin, the termination can be optionally disabled. To enable the input

termination, connect the respective TERM_ENABLE pin to VCC. To disable the internal termination, connect

TERM_ENABLE to VEE. If unconnected, the TERM_ENABLE pin will self-bias to VEE and disable the inter-

nal termination. Independent termination controls are provided for the “A” and “B” switches.

VCCP1A

VEE1A

VCCP2A

VEE2A

VCCP1B

VEE1B

VCCP2B

VEE2B

VCC

“OFF”

“ON”

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