PTN3501 데이터 시트보기 (PDF) - Philips Electronics

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PTN3501

Maintenance and control device

Philips Electronics 

Philips Semiconductors

Maintenance and control device

Product specification

PTN3501

Quasi-bidirectional I/Os (see Figure 13)

A quasi-bidirectional I/O can be used as an input or output without the use of a control signal for data direction. At power-on the I/Os are HIGH.

In this mode, only a current source to VDD is active. An additional strong pull-up to VDD allows fast rising edges into heavily loaded outputs.

These devices turn on when an output is written HIGH, and are switched off by the negative edge of SCL. The I/Os should be HIGH before

being used as inputs.

SLAVE ADDRESS (PTN3501)

DATA TO PORT

SDA S 0 A5 A4 A3 A2 A1 A0 0 A

1

START CONDITION

R/W ACKNOWLEDGE

P3

FROM SLAVE

SCL

12 345 678

DATA TO PORT

A

0

ACKNOWLEDGE

P3

FROM SLAVE

AP

P3

OUTPUT

VOLTAGE

P3

PULL-UP

OUTPUT

CURRENT

IOHt

IOH

Figure 13. Transient pull-up current IOHt while P3 changes from LOW-to-HIGH and back to LOW

SW00789

SYMBOL

PARAMETER

MIN

tpv

Output data valid; CL ≤ 100 pF

–

tps

Input data setup time; CL ≤ 100 pF

0

tph

Input data hold time; CL ≤ 100 pF

4

tiv

Interrupt input data valid time;

–

CL ≤ 100 pF

tir

Interrupt reset time; CL ≤ 100 pF

–

TYP

–

–

–

–

–

MAX

4

–

–

4

4

UNIT

µs

µs

µs

µs

µs

2001 Jan 17

7

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