VITESSE VSC7937RA, VSC7937KJRL, VSC7937KJL, VSC7937KJ, VSC7937X Datasheet
VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7937
Single Supply 2.5Gb/s Voltage Driver
G52200-0, Rev 3.0 Page 1
03/05/01
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
Features Applications
General Description
The VSC7937 is a single -5.2V supply, 2.5Gb/s voltage driver with direct access to the output modulation
and bias FETs. The output stag e can dri ve 60m A into 50
Ω with adequate output voltage co mpliance. Output
bias and modulation currents are set by external components allowing precision monitoring and setting of the
output voltage levels.
VSC7937 Block Diagram
• Typical Rise Times of 100ps
• High-Speed Operation
(Up to 2.5Gb/s NRZ Data)
• 3V Output Voltage Compliance
• Single-Ended or Differential Input Operation
• Single Power Supply: +5V or -5.2V
• Direct Access to Modulation and Bias FETs
• On-Die MUX for Clocked or Unclocked
Applications
• On-Chip 50
Ω Input Clock and Data Termination
• SONET/SDH @ 622Mb/s, 1.244Gb/ s, 2.488Gb/ s
• Full-Speed Fibre Channel (1.062Gb/s)
IBIAS1
OUTNOUT
VIP
VIB2
VIB1
MIP
MIB1
MIB2
IMOD
IBIAS2
I
NOUT
*Terminated to Off-chip Capacitor
**On Die Components
M
U
X
SEL
DIN
DINTERM*
DQ
50
Ω
**
50
Ω
**
50
Ω
**
50
Ω
**
NDIN
CLK
NCLK
CLKTERM*
SEL
VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7937
Single Supply 2.5Gb/s Voltage Driver
Page 2 G52200-0, Rev 3.0
03/05/01
© VITESSE SEMICONDUCTOR CORPORATION • 741 Ca ll e Pl an o • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
Electrical Characteristics
Table 1: High-Speed Inputs and ECL Outputs
VSS = -5.2V, RL = 50Ω at I
OUT
pin
NOTE: (1) 100mA when RL = 30Ω at (N) OUT pin.
Table 2: DC Characteristics
Symbol Parameter Min Typ Max Units Conditions
V
IN
Single-Ended Input Voltage Swing 300 — 1500 mVp-p V
CM
= -2.0V
V
CM
Differential Input Common-Mode Range -2.3 — -1.3 V VSS = -5.2V
V
OH
ECL Output HIGH Voltage -1200 ——mV 50Ω to -2.0V
V
OL
ECL Output LOW Voltage ——-1600 mV 50Ω to -2.0V
V
IN
On-Chip Terminations 35 — 65 Ω
I
NOUT
Maximum Peak Current
(1)
60 ——mA
VIP = VSS + 1.4V
VIB1 = -5.2V
VIB2 = -5.2V
DIN = LOW
I
NOUT
Maximum Peak Current —— 4mA
VIP = -4.1V
VIB1 = -5.2V
VIB2 = -5.2V
DIN = HIGH
t
R, tF
Rise and Fall Times ——100 ps 20% to 80%
V
OUT
Output Voltage ——-3.0 V
VIP = -4.1V
VIB1 = -5.2V
VIB2 = -5.2V
DIN = LOW
t
SU
Set-up Time - Data to CLK 20 50 — ps
t
H
Hold Time — 50 90 ps
Symbol Parameter Min Typ Max Units Conditions
V
SS
Power Supply Voltage -5.5 -5.2 -4.75 V
I
BIAS1,
I
BIAS2
Maximum Bias Current 30 ——mA
VIB1, 2 = VSS + 1.8V
VIP = -5.2V
V
DCC
Duty-Cycle Control Voltage V
SS
—
V
SS
+
3V
V
V
IH
HIGH Level Input Voltage -1.15 -0.9 -0.8 V V
REF
= 1.3V
V
IL
LOW Level Input Voltage — -1.7 -1.45 V V
REF
= 1.3V
VIB1, VIB2 BIAS Control Voltage V
SS
—
V
SS
+1.8
V
VIP Modulation Control Voltage V
SS
—
V
SS
+1.4
V
VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7937
Single Supply 2.5Gb/s Voltage Driver
G52200-0, Rev 3.0 Page 3
03/05/01
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
Table 3: Power Dissip atio n
Table 4: Package Thermal Specifications
Table 5: MUX Select Logic Table
Absolute Maximum Ratings
(1)
Power Supply Voltage (VSS) ............................................................................................................. VCC to -6.0V
Operating Junction Temperature Range (T
J
)............................................................................... -55°C to +125°C
Storage Temperature Range (T
S
)................................................................................................. -65°C to +150°C
NOTE: (1) CAUTION: Stresses listed under “Absolute Maximum Ratings” may be applied to devices one at a time without caus-
ing permanent damage. Functionality at or above the values listed is not implied. Exposure to these values for extended
periods may affect device reliability.
Recommended Operating Conditions
Positive Voltage Rail (GND)..............................................................................................................................0V
Negative Voltage Rail (V
SS
)..........................................................................................................................-5.2V
Operational Case Temperature Rang e (T
C
)
(1)
............................................................................... -40°C to +85°C
NOTE:(1) Lower limit of specification is ambient temperature and upper limit is case temperature
Symbol Parameter Min Typ Max Units Conditions
I
SS
Power Supply Current (VSS) ——-120mA
V
SS
= -5.5V, I
MOD
=
I
BIAS
= 0mA
P
D
Total Power Dissipation ——700 mW
V
SS
= -5.5V, I
MOD
=
I
BIAS
= 0 mA
Symbol Parameter Min Typ Max Units Conditions
θ
JCC
Thermal Resistance from Junction to Case — 25 — °C/W Ceramic Package
θ
JCP
Thermal Resistance from Junction to Case — 15 — °C/W Plastic Package
Symbol Rating
VSS Clocked Data In
GND Non-clocked Data In
NC Non-clocked Data In
VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7937
Single Supply 2.5Gb/s Voltage Driver
Page 4 G52200-0, Rev 3.0
03/05/01
© VITESSE SEMICONDUCTOR CORPORATION • 741 Ca ll e Pl an o • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
Figure 1: On-Chip Data and Clock Input Configuration
Figure 2: Single-Ended Operation
Figure 3: Single-Ended AC-Coupled
(NCLK)
NDIN
(CLKTERM)
DINTERM
(CLK)
DIN
VSSVSS
GND GND
50
50
4.0K
6.4K
DATA BUFFER
(CLOCK BUFFER)
X
X
X
*
*
*
*
*On-chip
Components
0.1µf
0.1µf
0.1µf
0.1µf
GND
NCLK
CLK
NDIN
DINTERM
DIN
7937
DATA
SOURCE
CLOCK
SOURCE
GND
GND
CLKTERM
GND
0.1µf
0.1µf
X
X
(NCLK)
NDIN
X
(CLKTERM)
DINTERM
(CLK)
DIN
VSS
GND
50
-2.0V
50
4.0K
6.4K
SOURCE
0.1µf
0.1µf
GND
0.1µf
GND
VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7937
Single Supply 2.5Gb/s Voltage Driver
G52200-0, Rev 3.0 Page 5
03/05/01
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
Figure 4: Differential AC-Coupled
Figure 5: Differential DC-Coupled/Differential ECL
X
X
(NCLK)
NDIN
X
(CLKTERM)
DINTERM
(CLK)
DIN
VSS
GND
50
-2.0V
50
4.0K
6.4K
SOURCE
0.1µf
0.1µf
GND
0.1µf
X
X
(NCLK)
NDIN
X
(CLKTERM)
DINTERM
(CLK)
DIN
VSS
-2.0V
GND
50
-2.0V
50
4.0K
6.4K
SOURCE
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