參數(shù)資料
型號: TPU2735
廠商: Electronic Theatre Controls, Inc.
英文描述: Teletext Processor
中文描述: 圖文處理器
文件頁數(shù): 14/37頁
文件大?。?/td> 1019K
代理商: TPU2735
TPU 2735
14
Characteristics,
continued
Symbol
Parameter
Pin No.
Min.
Typ.
Max.
Unit
Test Conditions
V
OH
Differential RGB Output Volt-
age, High
6, 7, 8
20
50
mV
V
SUP
= 5V
V
OL
Differential RGB Output Volt-
age, Low
6, 7, 8
10
mV
V
SUP
= 5V
V
N
Noise at RGB Outputs
6, 7, 8
10
mV
RMS
Teletext Mode,
B
w
= 6 MHz
External RGB Interface
C
I
Input Capacitance RGB Inputs
34, 33,
32
10
pF
R
ON
Resistance from RGB Inputs to
RGB Outputs
6, 7, 8
to 34,
33, 32
200
300
ext. inputs on
R
ON
Differential Resistance
6, 7, 8
to 34,
33, 32
10
ext. inputs on
R
OFF
Resistance from RGB Inputs to
RGB Outputs
6, 7, 8
to 34,
33, 32
1
M
ext. inputs off
B
w
Bandwidth ext. RGB
6, 7, 8
to 34,
33, 32
6
MHz
ext. inputs on
α
Cross-Talk RGB Inputs to RGB
Intern
6, 7, 8
to 34,
33, 32
50
dB
measured at RGB Outputs,
ext. inputs off
B
w
= 6 MHz
α
Cross-Talk RGB Inputs to RGB
Inputs
6, 7, 8
to 34,
33, 32
35
dB
measured at RGB Outputs,
ext. inputs on
B
w
= 6 MHz
V
N
Noise at RGB Outputs
6, 7, 8
5
mV
RMS
ext. inputs on
B
w
= 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
μ
s
– data in setup time 0ns
– address setup time 0ns
Fig. 3–13:
RAS and CAS timing
RAS
CAS
t
CASH
t
CASL
PAL
NTSC
D2MAC
t
CASH
85 ns
104 ns
85 ns
t
CASL
113 ns
104 ns
113 ns
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