Datasheet VSC7937RA, VSC7937KJRL, VSC7937KJL, VSC7937KJ, VSC7937X Datasheet (VITESSE)

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: [phone] • Email: [e-mail]

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: [phone] • Email: [e-mail]

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: [phone] • Email: [e-mail]

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: [phone] • Email: [e-mail]

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: [phone] • Email: [e-mail]

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

VITESSE

SEMICONDUCTOR CORPORATION

Preliminary Data Sheet

VSC7937

Single Supply 2.5Gb/s Voltage Driver

Page 6 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: [phone] • Email: [e-mail]

Internet: www.vitesse.com

Figure 6: Control Signals VIP and VIB

Figure 7: Simplified Output Structure

30 mA

60 mA

I (MIB)

I (MIP)

VIP

VIB

VSS + 1.5 Volts (Typical)

VSS + 1.1 Volts (Typical)

Typical Bias Current v.s. Bias Voltage

Typical Modulation Current v.s. Modulation Voltage

X

XXX

X

X

NOUT OUT

OUTPUT
DIFF
PAIR

VIB

MIB

MIP

VIP

I

MOD

I

BIAS

VITESSE

SEMICONDUCTOR CORPORATION

Preliminary Data Sheet

VSC7937

Single Supply 2.5Gb/s Voltage Driver

G52200-0, Rev 3.0 Page 7
03/05/01

© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012

Tel: (800) VITESSE • FAX: [phone] • Email: [e-mail]

Internet: www.vitesse.com

Bare Die Pad Descriptions

Figure 8: Pad Assignments for VSC7937 Die

PAD 25

PAD 24

PAD 23

PAD 22

PAD 21

PAD 20

PAD 19

PAD 18

VIB2

GND

N/C

NOUT

GND

OUT

N/C

GND

PAD 1

PAD 34 PAD 33 PAD 32 PAD 31 PAD 30 PAD 29 PAD 28 PAD 27 PAD 26

DCC VSS VSS VSS VIP MIP MIP MIB2 MIB2

PAD 2

PAD 3

PAD 4

PAD 5

PAD 6

PAD 7

PAD 8

N/C

NDIN

DIN

DINT

CLOCKT

CLOCK

NCLOCK

N/C

PAD 9 PAD 10 PAD 11 PAD 12 PAD 13 PAD 14 PAD 15 PAD 16 PAD 17

SEL GND GND GND GND GND VIB1 MIB1 MIB1

120

120

150

30

1720
1620

1720

1620

50

50

50

50

Dimensions in micrometers (µm).

VITESSE

SEMICONDUCTOR CORPORATION

Preliminary Data Sheet

VSC7937

Single Supply 2.5Gb/s Voltage Driver

Page 8 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: [phone] • Email: [e-mail]

Internet: www.vitesse.com

Package Pin Information

Table 6: Pin Identifications

NOTE: (1) Applicable to 32-pin TQFP package only

Signal Type Level # Pins Description

DIN, NDIN In 2 Data Input and Data Reference
DINTERM Ref DC 1 Data Termination
CLK, NCLK In 2 Clock Input and Clock Reference
CLKTERM Ref DC 1 Clock Termination
NOUT Out 1 Modulation Current Output (complementary)
OUT Out 1 Modulation Current Output (to Laser Cathode)
VSS Pwr Pwr 2 Negative Voltage Rail
GND Pwr Pwr 6/14

(1)

Positive Voltage Rail
VIP In DC 1 Modulation Control Node
MIP In DC 1 Modulation Monitor Node
VIB1, 2 In DC 2 Bias Control Node
MIB1, 2 In DC 2 Bias Monitor Node
DCC In DC 1 Duty Cycle Control
SEL In DC 1 Clk/Non-clk Data Select
T otal Pin s 24/32

(1)

VITESSE

SEMICONDUCTOR CORPORATION

Preliminary Data Sheet

VSC7937

Single Supply 2.5Gb/s Voltage Driver

G52200-0, Rev 3.0 Page 9
03/05/01

© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012

Tel: (800) VITESSE • FAX: [phone] • Email: [e-mail]

Internet: www.vitesse.com

Figure 9: Pin Diagram—24-Pin Ceramic Package

1

2

3

4

5

6

78910

11 12

13

14

15

16

17

18

24 23 22 21 20 19

NDIN

DIN

DINTERM

CLKTERM

CLK

NCLK

VIB2

GND

NOUT

GND

OUT

GND

SEL

GND

GND

GND

VIB1

MIB1

DCC

VSS

VSS

VIP

MIP

MIB2

VITESSE

SEMICONDUCTOR CORPORATION

Preliminary Data Sheet

VSC7937

Single Supply 2.5Gb/s Voltage Driver

Page 10 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: [phone] • Email: [e-mail]

Internet: www.vitesse.com

Figure 10: Pin Diagram—32-Pin Plastic Package

GND

NDIN

DIN

DINT

CLKT

CLK

NCLK

GND

GND

MIB1

VIB1

GND

GND

GND

SEL

GND

GND

OUT

GND

GND

NOUT

GND

VIB2

GND

MIB2

MIP

VIP

GND

VSS

VSS

DCC

GND

VITESSE

SEMICONDUCTOR CORPORATION

Preliminary Data Sheet

VSC7937

Single Supply 2.5Gb/s Voltage Driver

G52200-0, Rev 3.0 Page 11
03/05/01

© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012

Tel: (800) VITESSE • FAX: [phone] • Email: [e-mail]

Internet: www.vitesse.com

Package Information—24-Pin Ceramic Package (Formed Leads)

Top View

Side View

NOTES:

Drawing not to scale.
Package #: 101-000-0 Issue #:1

1

2

3

4

5

6

78910

11 12

13

14

15

16

17

18

24 23 22 21 20 19

INDEX

A

E

A

D

I

C

G

F

H

J

B

Key mm In

A9.5 0.374
B7.7 0.303
C2.0 0.079
D 1.27 0.050
E 0.30 0.012

F1.70.067
G0.6 0.024
H 11.5 0.453

I 0.125 0.005
J 8.51 0.335

VITESSE

SEMICONDUCTOR CORPORATION

Preliminary Data Sheet

VSC7937

Single Supply 2.5Gb/s Voltage Driver

Page 12 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: [phone] • Email: [e-mail]

Internet: www.vitesse.com

Package Information—24-Pin Ceramic Package (Straight Leads)

Top View

Side View

NOTES:

Drawing not to scale.
Package #: 101-000-0 Issue #:1

1

2

3

4

5

6

78910

11 12

13

14

15

16

17

18

24 23 22 21 20 19

INDEX

A

E

A

D

Key mm In

A9.5 0.374
B7.7 0.303
C5.8 .230
D 1.27 0.050
E 0.30 0.012

F1.7 0.067
G0.6 0.024
H 9.53 0.375

I 0.125 0.005
J 8.51 0.335

I

B

HC

C

F

G

VITESSE

SEMICONDUCTOR CORPORATION

Preliminary Data Sheet

VSC7937

Single Supply 2.5Gb/s Voltage Driver

G52200-0, Rev 3.0 Page 13
03/05/01

© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012

Tel: (800) VITESSE • FAX: [phone] • Email: [e-mail]

Internet: www.vitesse.com

Package Information—32 Pin Plastic TQFP Package

Note: Package lid and bottom heat spreader are electrically

connected to GND within the package.

Dimension mm Tolerance

A1.60MAX
A1 .10 ±.05
A2 1.40 ±.05

D 9.00 ±.20
D1 7.00 ±.10

E 9.00 ±.20

E1 7.00 ±.10

L.60+.15/-.10
e.80BASIC
b.35±.05
θ 0º - 7º

ddd .20 MAX

ccc .10 MAX

VITESSE

SEMICONDUCTOR CORPORATION

Preliminary Data Sheet

VSC7937

Single Supply 2.5Gb/s Voltage Driver

Page 14 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: [phone] • Email: [e-mail]

Internet: www.vitesse.com

Ordering Informatio n

The order number for this product is formed by a combination of the device number, and package style.

Notice

Vitesse Semiconductor Corporation (“Vitesse”) provides this document for informational purposes only. This document contains pre-production
information about Vitesse products in their conce pt, development and/or testi ng phase. All information in t his document, including de scriptions of
features, functions, performan ce, technical specifications and availability, is s ubject to change without notice at any time. Nothing contained in this
document shall be co nstru ed as e xten ding an y w arran ty or pr omise , e xpress or imp lied , that any Vitesse product wi ll b e av ail able as described or
will be suitable for or will accompli sh any particular task.

Vitesse products are not intended for use in life support applia nc es, devices or systems. Use of a Vitesse product in such applications without writ­ten consent is prohibited.

VSC7937

XX

Device Type

VSC7937: 2.5Gb/s Voltage/EML Driver

Package Style

KJ: (Ceramic - Straight Leads)
KJL: (Ceramic- Formed Leads)

KJRL: (Ceramic - Reversed Formed Leads}*

*Optional Reversed Formed Leads: Package leads have the same profile and dimensions,

but heat spreader is away from board. Please contact the factory for additional information.

RA: (32 Pin QFP Gull Wing Plastic Package}

X : (Bare Die)