STV5345 데이터 시트보기 (PDF) - STMicroelectronics

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STV5345

TELETEXT DECODER WITH 8 INTEGRATED PAGES

STMicroelectronics 

STV5345 - STV5345/H - STV5345/T

PIN DESCRIPTION

Pin

1

2,3,40 *

4*

5*

6

7

8

9

10

11

12

13,14,15

16

17

18

19

20

21

22-29 *

30-39 *

Symbol

VDD

A11, A12, A10

OE

WE

TTD

TTC

ODD/EVEN

F6

VCS

SAND

TCS/SCS

RGB

COR

BLAN

Y

SCL

SDA

VSS

D0-D7

A0-A9

Function

+5V

Chapter address

Output enable

Write enable

Teletext data input

Teletext clock input

Interlaced mode state output

Character display clock signal

Video composite

synchronization input signal

Sandcastle

Input / output composite

synchronization signal

Red, green, blue

Contrast reduction

Blanking signal output

Foreground output

Serial clock

Serial data input / output

0 Volt

Parallel data input / output

Address signals

Description

Positive supply voltage

Address selection outputs for 1 of 8 external static

RAM chapters each of 1 kBytes.

Active-low external static RAM output enable control

signal.

Active-low external static RAM write enable control

signal. It supports write-cycles interleaved with

read-cycles.

An A.C. coupled teletext data input supplied by the

SAA5231 chip is latched to VSS between 4 and 8µs

after each TV line.

A 6.9375MHz clock signal, supplied by the SAA5231

chip, is internally A.C. coupled, clamped and

buffered.

High for even numbered and low for odd-numbered

frames. The value is valid 2µs before the end of

lines 311 and 624.

The 6MHz clock signal, supplied by the SAA5231

chip is internally A.C. coupled, clamped and buffered.

Active high VCS input.

Three level output pulse to the SAA5231 device.

Phase lock, blanking signal, and color burst

components are contained in this signal.

Scan composite input signal (SCS) for the display

synchronization or Text composite sync. (TCS)

output signal to the SAA5231. Both signals are

active low.

Character and background colors active-high

open-drain outputs.

Open-drain active-low output supporting optimal

display of characters in ”mixed mode” operation.

Open-drain active high output for TV-image blanking

in normal and mixed-mode operation.

Open-drain active-high output with foreground

information. Can be used for printer command.

Microprocessor clock input via serial bus.

Open-drain microprocessor serial data input/output

via serial bus.

Ground.

Eight tri-state input/output for data read/write from/to

an external static RAM.

Ten addresses output pins for accessing to

individual Bytes of a 1 kByte chapter stored in an

external Static RAM.

* Pins only activated when 8KBytes of external memory are addressed, otherwise pins OE and WE remain high, and others remain low.

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