PCA9504A 查看數據表（PDF） - Philips Electronics

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PCA9504A

8-bit I2C and SMBus I/O port with 2-kbit EEPROM

Philips Electronics 

Philips Semiconductors

Glue chip 4

Product data

PCA9504A

FLUSH OUT* / INIT OUT* CIRCUIT

V_VCCP

VCC3

1 kΩ

1 kΩ

1 kΩ

ICH_A20M*

ICH_INIT*

GPO_FLUSH_CACHE*

VCCP

50 Ω

VCCP_VREF

100 Ω

1 µF

GLUE CHIP

H_INIT_OUT*

H_FLUSH_OUT_CPU*

H_FLUSH_OUT_FWH*

Figure 5. Block diagram for FLUSH_OUT*/INIT_OUT* circuit

CPU

FWH

SW00584

Case

A20M*

GPO FLUSH INIT* FLUSH OUT FLUSH OUT

CACHE*

CPU*

FWH*

INIT OUT*

1

1

falling edge 0

0 (for t1)

0 (for t1)

0, Hi-Z, then 0 (delayed by t1-t, then active for 2*t)

2

1

falling edge 1

0 (for t1)

0 (for t1)

Hi-Z, 0 (delayed by t1-t, then active for 2*t)

3

X

1

0

Hi-Z

Hi-Z

0

4

X

1

1

Hi-Z

Hi-Z

Hi-Z

5

0

falling edge 1

Hi-Z

Hi-Z

Hi-Z

6

0

falling edge 0

Hi-Z

Hi-Z

0

NOTE:

1. Nominal value timings with tolerances are listed in the DC Characteristics table for t and t1. All Hi-Z outputs are shown as 1’s or HIGH in the

following diagrams.

2004 May 11

17

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