VITESSE
SEMICONDUCTOR CORPORATION
Datasheet
2.488 Gb/s ATM/SDH/SONET STM-16/STS-48
VSC8025/VSC8026
Mux/Demux and Section Terminator IC Chipset
DC Characteristics (VSC8025/VSC8026)
Table 17: Standard ECL Inputs and Outputs
Parameter
Description
Min
Typ
Max
Units
Conditions
VOH
VOL
VIH
VIL
IIH
Output HIGH voltage
Output LOW voltage
Input HIGH voltage
Input LOW voltage
Input HIGH current
Input LOW current
-1020
-2000
-1165
-2000
-
-
-
-
-
-
-
-
-
-700
-1620
-700
-1475
200
-
mV
mV
mV
mV
uA
uA
mV
V
50 ohm to VTT
50 ohm to VTT
—
—
VIN=VIH (max)
VIN=VIL (min)
—
IIL
VDIFF
-50
Input Voltage Differential
Common Mode Voltage
200
-
VCM
-1.5
-0.5
—
Note: Differential ECL output pins must be terminated identically.
Table 18: High-Speed Differential ECL Inputs and Outputs (HSECL)
Parameter
Description
Min
Typ
Max
Units
Conditions
VOD
Output differential voltage
0.45
-
1.0
V
—
Output common-mode
voltage
VOCM
RO
-1.35
3
-
-
-0.95
7
V
—
Guaranteed, not
tested.
Output Impedance
ohms
VID
VICM
VIT
Input differential voltage
Input common-mode voltage
Input threshold matching
0.45
-1.6
-25
-
-
-
V
V
—
—
—
-0.5
25
mV
Note: HSECL inputs are NOT terminated on chip (high impedance inputs).
Table 19: TTL Inputs and Outputs
Parameter
Description
Min
Typ
Max
Units Conditions
VOH
VOL
VIH
VIL
IIH
Output HIGH voltage
Output LOW voltage
Input HIGH voltage
Input LOW voltage
Input HIGH current
Input LOW current
2.4
-
-
-
-
-
-
-
V
V
IOH=-2.4 mA
IOL=16 mA
—
0
2.0
0
0.4
5.5
0.8
50
-
V
V
—
-
uA
uA
VIN=VDD (max)
VIN=VIL (min)
IIL
-1000
Page 34
VITESSE SEMICONDUCTOR CORPORATION
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
G52182-0, Rev. 4.0
1/5/00
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
