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9/7/98

SPT7871

PACKAGE OUTLINE

adequate thermal performance under laboratory tests. Air

flow may be required for operation at elevated ambient

temperature. Fairchild recommends that the junction tem-

perature be maintained under +150

°C.

The thermal impedance values for the cerquad package are

air with no heat sink).

TTL DIGITAL OUTPUT LEVELS

The SPT7871 supports TTL and some CMOS logic levels.

(Refer to minimum high voltage level for selected digital parts

that will interface with the SPT7871.) It has single-ended outputs

THERMAL MANAGEMENT

Fairchild recommends that a heat sink be used for this device

to ensure rated performance. A heat sink in still air provides

Figure 4 - Digital Outputs Equivalent Circuit

Figure 2 - Typical Interface Circuit

Figure 3 - Clock Input Equivalent Circuit

AGND

CLK

26 k

Ω

AVCC

VEE

6 k

Ω

52 k

Ω

-1.3 V

(ESD)

(ESD)

NCLK

26 k

Ω

(ESD)

(ESD)

DGND

(ESD)

(ESD)

TTL OUT

DVCC

+A5

-A5.2

.01

D0

D1

D2

D3

D4

D5

D6

D7

D8

D9

D10

DGND

.01

FB1

Analog

Input

ECL

Differential

Clock Input

.01

.01

+A5

+D5

Interfacing

Logics

SPT7871

AGND

VEE

AVCC

CLK

CLK

X

X

DVCC

FB2

FB3

*

*

Notes:

1)

= Line termination

2)

= 0.01 µF chip cap. in parallel with

2.2 µF, tant cap.

3) Immediate output buffer is highly recommended

to optimize the performance due to reflection.

X

*

+5V

DGND

+D5

+

10 µF

+5 V

-5.2 V

AGND

+A5

-A5.2

+

10 µF

+

10µF

44L Cerquad

C

D

A

B

A

B

0 - 5°

E

F

G

H

1

44

INCHES

MILLIMETERS

SYMBOL

MIN

MAX

MIN

MAX

A

0.550 typ

13.97 typ

B

0.685

0.709

17.40

18.00

C

0.037

0.041

0.94

1.04

D

0.016 typ

0.41 typ

E

0.008 typ

0.20 typ

F

0.027

0.051

0.69

1.30

G

0.006 typ

0.15 typ

H

0.080

0.150

2.03

3.81