SAA7221 データシートの表示（PDF） - Philips Electronics

部品番号

コンポーネント説明

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SAA7221

Integrated MPEG AVGD decoders

Philips Electronics 

Philips Semiconductors

Integrated MPEG AVGD decoders

Preliminary specification

SAA7215; SAA7216; SAA7221

SYMBOL

PIN TYPE(1)

DESCRIPTION

DATACK

DS/TS

DATA(0)

DATA(1)

DATA(2)

DATA(3)

203

O/Z data acknowledge output; note 2

204

I data strobe or transfer start input; note 2

205

I/O CPU data input or output (bit 0); note 2

206

I/O CPU data input or output (bit 1); note 2

207

I/O CPU data input or output (bit 2); note 2

208

I/O CPU data input or output (bit 3); note 2

Notes

1. Pin type abbreviations: I = Input, O = Output, I/O = Input or Output, O/Z = high impedance Output and

S = Supply voltage.

2. 5 V tolerant outputs swing between VSS and VDD. 5 V tolerant inputs can receive signals swinging between VSS and

3.3 V or VSS and 5 V.

3. Signal CPU_SEL(1) is used only after a global hardware reset is applied on external input line RESET for determining

the type of the microcontroller connected to SAA7215; SAA7216; SAA7221 and therefore apply the proper

communication protocol. This microcontroller type must be given by means of weak pull-up or pull-down externally

connected to CPU_SEL(1). During normal operation, the pin TTXRQ/CPU_SEL(1) is used for implementing the

Teletext Data Request protocol and must not be disturbed by the microcontroller type setting.

2000 Jan 31

14

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