PRODUCT SPECIFICATION

FAN1654

2

REV. 1.0.5 4/17/02

Pin Assignments

Pin Definitions

* Pin Numbers in brackets are for the SOIC-14 package

Typical Application

Pin Number*

Pin Name

Pin Function Description

1, 2, 7 (4, 5, 10)

VDD

VDD. Input power for the LDO.

3, 6 (6, 9)

VTTFORCE

VTT Force Output.

4, 5, 8 (7, 8, 11)

VSS

Power Ground.

10 (12)

VTTSENSE

VTT Sense. Feedback for remote sense of the VTT voltage.

11 (13)

VREFIN

VREFIN. Alternative input for direct control of VTTOUT and VREFOUT.

12 (14)

SHDN

Shutdown. This active low shutdown turns off both VTT and VREFOUT. This

pin has an internal pull-down, and must be externally driven high for the IC to be

on.

13 (1)

VSSQ

Signal Ground.

14 (2)

VREFOUT

Buffered Voltage Reference Output.

15 (3)

VDDQ

VDDQ Input. Attach this pin to the VDDQ supply to generate VTT and

VREFOUT.

9,16

NC

No Internal Connection

14

13

12

11

10

9

8

1

2

3

4

5

6

7

FAN1654

SHDN

VREFIN

VTTSENSE

VSS

VDD

VTTFORCE

VSS

VSSQ

VREFOUT

VDDQ

VDD

VDD

VTTFORCE

VSS

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

FAN1654

NC

VDDQ

VREFOUT

VSSQ

SHDN

VREFIN

VTTSENSE

NC

VDD

VDD

VTTFORCE

VSS

VSS

VTTFORCE

VDD

VSS

16-Lead Plastic eTSSOP-16

*With package power slug soldered to 0.5 square inch

copper area over backside ground plane of internal

power plane

14-Lead Plastic SOIC

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

100

µF

6V

10

µF

GND

VDD

1nF

(connect to VTTFORCE

at the load)

VTTSENSE

470

µF

10

µF

VTTFORCE

1nF

GND

VREFOUT

SHDN

VDDQ

10k

FAN1654

Figure 1. (eTSSOP pinout shown)