TPU2735 Просмотр технического описания (PDF) - Unspecified

Номер в каталоге

Компоненты Описание

производитель

TPU2735

Teletext Processor

Unspecified 

TPU 2735

Characteristics, continued

Symbol

∆VOH

∆VOL

VN

Parameter

Differential RGB Output Volt-

age, High

Differential RGB Output Volt-

age, Low

Noise at RGB Outputs

Pin No.

6, 7, 8

Min.

6, 7, 8

6, 7, 8

External RGB Interface

CI

Input Capacitance RGB Inputs 34, 33,

32

RON

Resistance from RGB Inputs to 6, 7, 8

RGB Outputs

to 34,

33, 32

∆RON

Differential Resistance

6, 7, 8

to 34,

33, 32

ROFF

Resistance from RGB Inputs to 6, 7, 8 1

RGB Outputs

to 34,

33, 32

Bw

Bandwidth ext. RGB

6, 7, 8 6

to 34,

33, 32

α

Cross-Talk RGB Inputs to RGB 6, 7, 8

Intern

to 34,

33, 32

α

Cross-Talk RGB Inputs to RGB 6, 7, 8

Inputs

to 34,

33, 32

VN

Noise at RGB Outputs

6, 7, 8

Typ.

20

10

10

200

50

35

5

Max.

50

Unit

mV

mV

mV

RMS

Test Conditions

VSUP = 5V

VSUP= 5V

Teletext Mode,

Bw = 6 MHz

10

pF

300

Ω

ext. inputs on

10

Ω

ext. inputs on

MΩ

ext. inputs off

MHz

ext. inputs on

dB

dB

mV

RMS

measured at RGB Outputs,

ext. inputs off

Bw = 6 MHz

measured at RGB Outputs,

ext. inputs on

Bw = 6 MHz

ext. inputs on

Bw = 6 MHz

3.5.5. Characteristics of the External RAM

The TPU 2735 is designed to control one dynamic

64 kbit or 256 kbit RAM. The essential RAM characteris-

tics are:

– page mode capability

– access time from CAS 100ns

– 256 cycle 4 ms refresh (A0 to A7)

– max. RAS pulsewidth 10 µs

– data in setup time 0ns

– address setup time 0ns

14

RAS

CAS

tCASH

tCASL

Fig. 3–13: RAS and CAS timing

tCASH

tCASL

PAL

85 ns

113 ns

NTSC

104 ns

104 ns

D2MAC

85 ns

113 ns

Share Link: