4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and

28-Port I/O Expander

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 17

© 2006 Maxim Integrated Products

Printed USA

is a registered trademark of Maxim Integrated Products, Inc.

e

e

L

L

A1

A2

A

E/2

E

D/2

D

E2/2

E2

(NE-1) X e

(ND-1) X e

e

D2/2

D2

b

k

k

L

CL

CL

CL

CL

F

1

2

21-0141

PACKAGE OUTLINE

36, 40, 48L THIN QFN, 6x6x0.8mm

L1

L

e

8. COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS.

6. ND AND NE REFER TO THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY.

5. DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.25 mm AND 0.30 mm

FROM TERMINAL TIP.

4. THE TERMINAL #1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL CONFORM TO JESD 95-1

SPP-012. DETAILS OF TERMINAL #1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE

ZONE INDICATED. THE TERMINAL #1 IDENTIFIER MAY BE EITHER A MOLD OR MARKED FEATURE.

9. DRAWING CONFORMS TO JEDEC MO220, EXCEPT FOR 0.4mm LEAD PITCH PACKAGE T4866-1.

7. DEPOPULATION IS POSSIBLE IN A SYMMETRICAL FASHION.

3. N IS THE TOTAL NUMBER OF TERMINALS.

2. ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES.

1. DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5M-1994.

NOTES:

10. WARPAGE SHALL NOT EXCEED 0.10 mm.

11. MARKING IS FOR PACKAGE ORIENTATION REFERENCE ONLY.

12. NUMBER OF LEADS SHOWN FOR REFERENCE ONLY.

REV.

DOCUMENT CONTROL NO.

APPROVAL

PROPRIETARY INFORMATION

TITLE:

F

2

2

21-0141

PACKAGE OUTLINE

36, 40, 48L THIN QFN, 6x6x0.8mm

REV.

DOCUMENT CONTROL NO.

APPROVAL

PROPRIETARY INFORMATION

TITLE:

Package Information (continued)

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,