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PDF TPU2735 Data sheet ( Hoja de datos )
| Número de pieza | TPU2735 | |
| Descripción | Teletext Processor | |
| Fabricantes | ETC | |
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TPU 2735
Teletext Processor
Edition Jan. 13, 1993
6251-312-4E
ITT Semiconductors
1 page  
TPU 2735
2. Functional Description
The TPU 2735 whose block diagram is shown in Fig.
2–1, operates according to a rigid timing determined by
the vertical cycle of the TV receiver. The data acquisition
period starts at line 7 with PAL or line 10 with NTSC and
ends at line 22 with PAL or line 21 with NTSC. During this
period, the input data is processed by a ghost filter which
is able to compensate reflections with short delay time
of 0 to 0.8 µs for PAL or 0 to 1 µs for NTSC. In the D2MAC
mode the acquisition is active from line 1 to 22 and line
313 to 334.
In the Data Acquisition Unit the Teletext information is
synchronized and identified. A comparator preselects
the pages with page numbers that are requested by the
CCU 2000 or CCU 3000 Central Control Unit and loads
them into the RAM. To eliminate speed problems of the
external Dynamic RAM, the data is buffered in an inter-
nal RAM buffer (Fig. 2–1). The comparator contained in
the data acquisition unit decides into which sector of the
DRAM the data is stored.
The display period starts at line 48 with PAL or line 50
with NTSC and ends at line 286 with PAL or line 242 with
NTSC. The display control unit selects one of the stored
eight pages for display. The 8-bit character words are
transformed into a 6 x 10 dot matrix with PAL or 6 x 8 dot
matrix with NTSC by a character generator (ROM) of 96
programmed characters and are displayed in 24 rows of
40 characters each. Optionally, 25 rows can be dis-
played in PAL/D2MAC. Different character sets are
available for eight languages under CCU or transmitter
control, the required character set being selected auto-
matically by the control bits C12 to C14 of row 0 of the
Teletext page displayed. Every tenth line with PAL or
every eighth line with NTSC a new Teletext row is loaded
from the DRAM into the RAM buffer. When the RAM is
not accessed by the TPU 2735, the memory control re-
freshes the memory and handles CCU requests for RAM
access.
Via the IM bus the CCU can access all RAM locations
and controls the TPU 2735 by loading the appropriate
registers in the RAM, so that the TPU 2735 can be used
to display text from other sources. The TPU 2735 can
display a list of contents of the stored eight pages
(menu) all by itself.The TPU 2735 can use either one 64
Kx1 bit Dynamic RAM or one 256 Kx1 bit Dynamic RAM.
So, RAM capacity is flexible to store up to 32 pages. The
DRAMs can be standard types (see section 3.).
39
V1
40
1
2
3
V6 4
Data
Acquisition
Unit
Ghost
Compensation
38
D2–
DATA
5
GND
Bl. 10
R 34
G 33
B 32
8
8
Display Control
Unit and
Character Gen.
TPU 2735
RAM Buffer
A0 17 18 19 21 22 23 24 25 A7
Memory
Control
Unit
26
A8
27 Data
28 R/W
29
CAS
30
RAS
Data Bus 1 Data Bus 2
Start Address Bus
Central
Timing and
Control
8
6
8
IM Bus
Interface
35
VSUP
678 9
R G B Bl.
Fig. 2–1: Block diagram of the TPU 2735
11 12 13 36 31
H V Res.F M DSD
14 15 16
IM Bus
5
5 Page 
TPU 2735
3.5. Electrical Characteristics
All voltages refer to pin 5, all pin numbers refer to DIL Package.
3.5.1. Absolute Maximum Ratings
Symbol
TA
TS
VSUP
VI
VO
IO
Parameter
Ambient Operating Temper-
ature
Storage Temperature
Supply Voltage
Input Voltage, all Inputs
Output Voltage, all Outputs
Output Voltage, all Outputs
Pin No.
–
–
35
–
–
–
Min.
0
Max.
65
Unit
°C
–40 +125
–6
–0.3V
VSUP
–0.3V
VSUP
The push-pull outputs are short-cir-
cuit-proof with respect to ground
and supply.
°C
V
–
–
–
3.5.2. Recommended Operating Conditions at TA = 0 °C to 65 °C, fc = 14.3 to 20.3 MHz
Symbol
VSUP
VIH
VIL
VIH
VIL
VIH
Parameter
Supply Voltage
Input Voltage High,
Video Inputs
Input Voltage Low,
Video Inputs
Input Voltage High,
Fast Blank Input
Input Voltage Low,
Fast Blank Input
Input Voltage High
VIL Input Voltage Low
VIH Input Voltage High,
Reset Input
VIL Input Voltage Low,
Reset Input
VIH Input Current High,
Skew Data Input
VIL Input Voltage Low,
Skew Data Input
Pin
No.
35
39, 40,
1 to 4
Min.
4.75
VSUP/2
+0.3
Typ.
5.0
10 0.9
10
11, 12,
14, 15,
16
11, 12,
14, 15,
16
13
2.4
2.4
13
31
31
Max.
Unit
5.25 V
V
VSUP/2
–0.3
V
V
0.5 V
V
0.8 V
V
1.2 V
–20 µA
1.2 V
Test Conditions
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet TPU2735.PDF ] | |
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