VSC8140QR VITESSE [Vitesse Semiconductor Corporation], VSC8140QR Datasheet - Page 3

• Manufacturer Part Number: VSC8140QR
• Description: 2.48832Gb/s 16:1 SONET/SDH Transceiver with Integrated Clock Generator
• Manufacturer: VITESSE [Vitesse Semiconductor Corporation]

VSC8140
Data Sheet
9/6/00
G52251-0, Rev. 4.0
RESET
Figure 3: DC Termination of Low-Speed LVPECL RXCLK16O, RXCLK16_32O, TXCLK16O Outputs
Figure 4: DC Termination of Low-Speed LVPECL RXCLK16O, RXCLK16_32O, TXCLK16O Outputs
PLL locked to reference clock.
VSC8140
Holding RESET “low” for a minimum of 5 CLK16 cycles, then setting “high” enables FIFO operation.
Holding RESET constantly “low” bypasses the FIFO for transparent mode operation.
VSC8140
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: [phone]
Minimum 5 CLK16 cycles
Split-end equivalent termination is Z
R1 = 125
VITESSE
VITESSE SEMICONDUCTOR CORPORATION
SEMICONDUCTOR CORPORATION
V
R2 = 83 , Z
Figure 2: Enabling FIFO Operation
CC
R1||R2 = Z
R2 + V
R1+R2
Z
EE
Z
Z
O
O
o
R1
o
=50 , V
o
= V
TERM
TERM
O
to V
= V
TERM
CC
Transceiver with Integrated Clock Generator
-2V
R1 =50
V
V
V
CC
EE
CC
Transparent Mode Operation
-2V
FIFO Mode Operation
R1
R2
2.48832Gb/s 16:1 SONET/SDH
R1
R2
R1 =50
V
downstream
CC
downstream
-2V
Page 3