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UM8321 Datasheet Preview

UM8321 Datasheet

CRT Video Attributtes Controller

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(l)UMC
UM8321
Features
• On chip attributes logic
Reverse video
Character blank
Character blink
Underline
Full/half intensity
• Four modes of operation
Wide graphics
Thin graphics
Character mode without underline
Character mode with underline
• On Chip logic for double height double width characters
• Accepts scan line information in parallel or serial format
General Description
The UM8321 Video Attributes Controller (VAC) is an
n-channel MaS/LSI device containing graphics logic,
attributes logic, data and attributes latches, cursor control
and a high speed video shift register. A character generator
ROM and a CRT Video attributes controller UM8321
provide all of the major circuitry for the display portion
of a CRT video terminal.
The UM8321 serial video output may be connected directly
to 3 CRT monitor's video input.
The UM8321 attributes include: reverse video, underline,
character blank, character blink, and full/half intensity
selection. In addition. When used in conjunction with
the UM9007, the UM8321 will provide double height or
double width characters.
Four programmable cursor modes are provided on the
UM8321. They are underline, blinking underline, reserve
video character block, and blinking reverse video character
block. When used in the serial scan line input mode, the
cursor mode may be selected via two input pins. When
used in the parallel scan line input mode, the cursor mode
is a mask program option and is fixed at the time of
manufacture.
Two graphics modes are provided. In the wide graphics
mode, the UM8321 produces a graphic entity the size
of the character block. The graphic entity contains eight
parts, each of which is associated with one bit of the input
byte, thereby providing 256 unique graphic symbols. The
thin graphics mode enables the user to create thin line
drawings and forms.
• Four cursor modes dynarnically selectable via 2 input
pins
Underline
Blinking underline
Reverse video
Blinking reverse video
• Programmable character blink rate
• Programmable cursor blink rate
• On chip data and attribute latches
• +5 volt operation
• TTL compatible
• MaS n-Channel silicon gate
• Compatible with UM9007
In both graphics rnodes, continuous horizontal and vertical
lines may be drawn. Additional flexibility is provided by
allOWing the mask programming of the placement and
dimensions of the blocks or lines within a character block.
In the thin graphics mode, mask programming allows
serrated horizontal or vertical lines.
Pin Configuration
00
MSO
MS1
REVIO
CHABL
BLINK
INTIN
+5V
ATTEN
INTOUT
CURSOR
RETBL
LD/SH
VIOEO
01
02
03
04
05
06
07
VSYNC
GNO
SLO/SLO
SL l/SLG
SL2/BLC
SL3/BKC
VOC




UMC

UM8321 Datasheet Preview

UM8321 Datasheet

CRT Video Attributtes Controller

No Preview Available !

Absolute Maximum Ratings*
Operating Temperature Range. . . . . .. OOC to + 70°C
Storage Temperature Range . " ..... -55°C to + 150°C
Lead Temperature (soldering, 10 sec.) ........ +325°C
Positive Voltage on any Pin, with respect to
ground ..................... , ..... +8.0V
Negative Voltage on any Pin, with r~spect
to ground .......................... -0.3V
UM8321
*Comments
Streeses above those Iisted may cause permanent damage
to the device. This is a stress rating only and functional
operation of the device at these or at any other condition
above those indicated in the operational sections of this
specification is not implied.
Note: When powering this device from laboratory or
system power supplies, it is important that the Absolute
Maximum Ratings not be exceeded or device failure can
result. Some power supplies exhibit voltage spikes or
"glitches" on their outputs w'hen the AC power is switched
on and .off. In addition, voltage transients on the AC
power line may appear on the DC output. If this possibility
exists it is suggested that a clamp circuit be used ..
Block Diagram
07-00
.CURSOR
RETBL
LD/SH
ATTEN
MSO
MSl
REVID
CHABL
BLINK
INTIN'
ATTRIBUTE
AND
GRAPHIC
LOGIC
SCAN
LINE
MODE
DETECT
BLINK
RATE
LOGIC
SLO/SLD
SL1/SLG
SL2/BLC
SL3/BKC
VSYNC
VIDEO
VDC
INTOUT
5-58


Part Number UM8321
Description CRT Video Attributtes Controller
Maker UMC
Total Page 14 Pages
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