Serial-to-Parallel/Parallel-to-Serial Converters and

Load-Switch Controllers with SMBus Interface

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5

______________________________________________________________Pin Description

NAME

FUNCTION

1

Supply Voltage Input, 2.7V to 5.5V.

2

I/O1

Input 1 or Output 1 (open drain). This pin can tolerate up to 28V.

PIN

3

I/O2

Input 2 or Output 2 (open drain). This pin can tolerate up to 28V.

4

I/O3

Input 3 or Output 3 (open drain). This pin can tolerate up to 28V.

8

SMBDATA

SMBus Serial-Data Input/Output (open drain)

7

SMBSUS

SMBus Suspend-Mode Control Input. Drive low to select the suspend-mode register. Drive high to select

the normal-mode register. (See

Detailed Description.)

6

ADD

SMBus Address Select Pin (see Table 1 for details).

5

GND

Ground

10

ALERT

Interrupt Output, active low, open drain

9

SMBCLK

SMBus Serial Clock Input

INPUT

REGISTER

TRANSITION

DETECTORS

SMBSUS

NORMAL

DATA

REGISTER

NORMAL

I/01

I/02

I/03

SUSPEND

O1

CONTROL

NORMAL

SUSPEND

CONTROL

NORMAL

SUSPEND

CONTROL

SUSPEND-

MODE

DATA

REGISTER

ALERT

RESPONSE

REGISTER

ADDRESS

DECODER

SMB

THERMAL

SHUTDOWN

8

7

ALERT

FAULT

LATCH

S

R

ADD

SMBDATA

SMBCLK

MAX1661/

MAX1662/

MAX1663

O2

O3

MUX

MUX

MUX

Figure 1. Functional Diagram