INTEGRATED CIRCUITS
DATA SHEET
SAA5355
Single-chip colour CRT controller
(FTFROM)
Product specification
File under Integrated Circuits, IC02
March 1986
Philips Semiconductors
Product specification
Single-chip colour CRT controller
(FTFROM)
GENERAL DESCRIPTION
SAA5355
The SAA5355 FTFROM (Five-Two-Five-ROM) is a single-chip VLSI NMOS crt controller capable of handling the display
functions required for a 525-line, level-3 videotex decoder. Only minimal hardware is required to produce a videotex
terminal using FTFROM
the simplest configuration needs just a microcontroller and 4 Kbytes of display memory.
Features
•
Minimal additional hardware required
•
Screen formats of 40/80 character by 1-to-25 row display
•
512 alphanumeric or graphical characters on-chip or extendable off-chip
•
Serial attribute storage (STACK) and parallel attribute storage
•
Dynamically redefinable character (DRCS) capability over full field
•
Interfaces with 8/16-bit microprocessors with optional direct memory access
•
On-chip scroll map minimizes data to be transferred when scrolling
•
32 on-screen colours redefinable from a palette of 4096
•
Three on-chip digital-to-analogue converters which compensate for crt non-linearity
•
Memory interface capable of supporting multi-page terminals. FTFROM can access up to 128 Kbytes of display
memory
•
Programmable cursor
•
Programmable local status row
•
Three synchronization modes:
stand-alone
simple slave
phase-locked slave
built-in oscillator operating with an external 6,041957 MHz crystal
directly synchronized from the source of text composite sync
indirect synchronization allows picture-in-text displays (e.g. VCR/VLP video with text overlay)
•
On-chip timing with composite sync output
•
Zoom feature which allows the height of any group of rows to be increased to enhance legibility
PACKAGE OUTLINE
40-lead DIL; plastic (SOT129); SOT 129-1; 1996 November 18.
March 1986
2
Philips Semiconductors
Product specification
Single-chip colour CRT controller
(FTFROM)
SAA5355
March 1986
3
Fig.1 Block diagram.
Philips Semiconductors
Product specification
Single-chip colour CRT controller
(FTFROM)
PINNING
1
2
3
4 to 19
20
21
22
23
24
25
V
SS(1)
BUFEN
RE
A16 to A1/
D15 to D0
V
SS(2)
REF
B
G
R
VDS
Analogue outputs (signals are gamma-corrected).
Ground (0 V).
Buffer enable input to the 8-bit link-through buffer.
Register enable input. This enables A1 to A6 and UDS as inputs,
and D8 to D15 as input/outputs.
SAA5355
Multiplexed address and data bus input/outputs. These pins also function as the
8-bit link-through buffer.
Ground (0 V).
Analogue reference input.
Switching output for dot, screen (row), box and window video data; for use when
video signal is present (e.g. from tv, VLP, alpha
+
photographic layer). This output
is LOW for tv display and HIGH for text and will interface directly with a number of
colour decoder ICs (e.g. TDA3563, TDA3562A).
Output disable causing R, G, B and VDS outputs to go to high-impedance state.
Can be used at dot-rate.
12 MHz clock output for hard-copy dot synchronization (referenced to output
dots).
Sandcastle feedback output for SAA5230 teletext video processor or other circuit.
Used when the display must be locked to the video source (e.g. VLP).
The phase-lock part of the sandcastle waveform can be disabled to allow
free-running of the SAA5230 phase-locked loop.
1,00699 MHz or 6,041957 MHz output.
6,041957 MHz clock input (e.g. from SAA5230). Internal a.c. coupling is provided.
Video composite sync input (e.g. from SAA5230) for phase reference of vertical
display timing when locking to a video source (e.g. VLP) or, in stand-alone sync
mode, output from internal oscillator circuit (fixed frequency).
Text composite sync input/output depending on master/slave status.
Field sync pulse output or defined-display-area flag output (both referenced to
output dots).
Upper data strobe input/output.
Lower data strobe output.
Data transfer acknowledge (open drain output).
Bus request to microprocessor (open drain output).
Address strobe output to external address latches.
Read/write input/output. Also serves as send/receive for the link-through buffer.
Positive supply voltage (+ 5 V).
26
27
28
OD
CLKO
SAND
29
30
31
F1/F6
F6
VCS/OSCO
32
33
34
35
36
37
38
39
40
TCS
FS/DDA
UDS
LDS
DTACK
BR
AS
R/W(S/R)
V
DD
March 1986
4
Philips Semiconductors
Product specification
Single-chip colour CRT controller
(FTFROM)
SAA5355
Fig.2 Pinning diagram.
RATINGS
Limiting values in accordance with the Absolute Maximum System (IEC 134)
Supply voltage range (pin 40)
Maximum input voltage (except F6, TCS, REF)
Maximum input voltage (F6, TCS)
Maximum input voltage (REF)
Maximum output voltage
Maximum output current
Operating ambient temperature range
Storage temperature range
V
DD
V
Imax
V
lmax
V
REF
V
Omax
I
Omax
T
amb
T
stg
−0,3
to
+
7,5 V
−0,3
to
+
7,5 V
−0,3
to
+
10,0 V
−0,3
to
+
3,0 V
−0,3
to
+
7,5 V
10 mA
−20
to
+
70
°C
−55
to
+
125
°C
Outputs other than CLKO, OSCO, R, G, B, and VDS are short-circuit protected.
March 1986
5
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