VSC838UG 查看數據表（PDF） - Vitesse Semiconductor
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VSC838UG Datasheet PDF : 20 Pages
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VITESSE
SEMICONDUCTOR CORPORATION
3.2Gb/s
36x37 Crosspoint Switch
Preliminary Data Sheet
VSC838
Output Termination
The high-speed outputs of the VSC838 are internally back terminated by 50Ω to VCC when the
TERM_CTRL pin is HIGH. When this pin is LOW, the output driver functions as an open-drain CML driver.
Setting DRIVE_CTRL LOW (GND) saves 1W under maximum power dissipation conditions. See Table 9 for
allowable types of terminations and modes of operation.
Table 9: Allowed High-Speed Output Terminations and Modes of Operation
Type
Description
1 AC-coupled to 50Ω termination to any voltage
2 AC-coupled to 100Ω differential termination
3 DC-coupled, terminated in 50Ω to VCC at far-end only
4 DC-coupled, terminated in 50Ω to VCC at far-end only
5 DC-coupled, source and far-end terminated in 50Ω to VCC
6 DC-coupled, source and far-end terminated in 50Ω to VCC
7 DC-coupled, 100Ω differential termination
8 DC-coupled, 100Ω differential termination
NOTE: (1) Measured at output of VSC838, with VCC = 2.5V.
Absolute Maximum Ratings(1)
DRIVE_
CTRL
VCC (HIGH)
VCC (HIGH)
GND (LOW)
VCC (HIGH)
GND (LOW)
VCC (HIGH)
GND (LOW)
VCC (HIGH)
TERM_
CTRL
VCC (ON)
VCC (ON)
GND (OFF)
GND (OFF)
VCC (ON)
VCC (ON)
VCC (ON)
VCC (ON)
VOD(1)
(mV)
typ
500
500
500
1000
250
500
250
500
VOCM(1)
(V)
typ
2.0
2.0
2.25
2.0
2.375
2.25
2.25
2.0
Power Supply Voltage (VCC) Potential to GND ..............................................................................-0.5V to +4.0V
LVTTL Input Voltage Applied ................................................................................................-0.5V to VCC+1.0V
ECL Input Voltage Applied ....................................................................................................-0.5V to VCC +0.5V
Output Current (IOUT) .................................................................................................................................... 50mA
Case Temperature Under Bias (TC) ............................................................................................. -55oC to + 125oC
Storage Temperature (TSTG) ........................................................................................................ -65oC to + 150oC
NOTE: (1) Caution: Stresses listed under “Absolute Maximum Ratings” may be applied to devices one at a time without causing perma-
nent damage. Functionality at or exceeding the values listed is not implied. Exposure to these values for extended periods may
affect device reliability.
Operating Conditions
Supply Voltage (VEE).......................................................................................................................................... 0V
Supply Voltage (VCC) ............................................................................................................................+2.5V ±5%
Supply Voltage (VCCP)...........................................................................................................................+2.5V ±5%
Case Temperature Operating Range (T)..................................................... 0oC to 85oCPackage Pin Descriptions
Page 10
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
G52351-0, Rev 3.0
02/12/01
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