PCA9556(1998) Просмотр технического описания (PDF) - Philips Electronics

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производитель

PCA9556
(Rev.:1998)

Octal SMBus Registered Interface

Philips Electronics 

Philips Semiconductors

Octal SMBus Registered Interface

Product specification

PCA9556

FEATURES

• SMBus compliance with fixed 3.3V voltage levels

• Operating power supply voltage range of 3.0V – 3.6V

• Active high polarity inverter register

• Write protect register

• Active low reset pin

• Low leakage current on power-down

• Noise filter on SCL/SDA inputs

• No glitch on power-up

• Internal power-on reset

• 8 I/O pins which default to 8 inputs

• High impedance open drain on I/O

DESCRIPTION

The PCA9556 is a silicon CMOS circuit which provides parallel

input/output expansion for SMBus applications. The PCA9556

consists of an 8-bit input port register, 8-bit output port register, and

an SMBus interface. It has low current consumption and a high

impedance open drain output pin, I/O0.

The SMBus system master can reset the PCA9556 in the event of a

timeout by asserting a LOW on the reset input. The SMBus system

master can also invert the PCA9556 inputs by writing to their active

HIGH polarity inversion bits. Finally, the SMBus system master can

enable the PCA9556’s I/Os as either inputs or outputs by writing to

their I/O configuration bits.

The power-on reset sets the registers to their default values and

initializes the SMBus state machine. The RESET pin causes the

same reset/initialization to occur without depowering the part.

PIN CONFIGURATION

SCL 1

SDA 2

A0 3

A1 4

A2 5

I/O0 6

I/O1 7

VSS 8

16 VDD

15 RESET

14 I/O7

13 I/O6

12 I/O5

11 I/O4

10 I/O3

9 I/O2

su01045

Figure 1. Pin configuration

PIN DESCRIPTION

PIN

NUMBER

SYMBOL

1

SCL

2

SDA

3

A0

4

A1

5

A2

6

I/O0

7

I/O1

8

VSS

9

I/O2

10

I/O3

11

I/O4

12

I/O5

13

I/O6

14

I/O7

15

RESET

16

VDD

FUNCTION

Serial clock line

Serial data line

Address input 0

Address input 1

Address input 2

I/O0 (open drain)

I/O1

Supply GROUND

I/O2

I/O3

I/O4

I/O5

I/O6

I/O7

External reset (active LOW)

Supply voltage

ORDERING INFORMATION

PACKAGES

16-Pin Plastic TSSOP16 Type I

TEMPERATURE RANGE

0°C to +70°C

OUTSIDE NORTH AMERICA

PCA9556 PW

DRAWING NUMBER

SOT403-1

1998 Dec 18

2

853-2138 20549

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