Four Character 3.8 mm (0.15 in.)
Glass/Ceramic Smart
Alphanumeric Display
Technical Data
HMDL-2416
Features
• Wide Operating Temperature
Range
-55°C to +100°C
• CMOS IC for Low Power
Consumption
• Smart Alphanumeric Display
Built-in RAM, ASCII Decoder,
and LED Drive Circuitry
• Very Fast Access Time,
160 ns
• Excellent ESD Protection
Built-in Protective Diodes
• Full TTL Compatibility Over
Operating Temperature
Range
• End-Stackable
• Wide Viewing Angle
• Wave Solderable
Description
The HMDL-2416 is a smart
3.8 mm (0.15 in.) four character,
sixteen segment red GaAsP
display. It is sealed in a glass/
ceramic 18 pin dual-in-line
package. The on-board CMOS IC
contains memory, ASCII decoder,
multiplexing circuitry, and
drivers. It has a wide operating
temperature range, and is fully
TTL compatible, wave solderable,
and highly reliable. This display is
ideally suited for military and
high reliability industrial applica-
tions where a rugged, reliable,
easy-to-use alphanumeric display
is required.
Absolute Maximum Ratings
Supply Voltage, V
CC
to Ground ...................................... -0.5 V to 7.0 V
Input Voltage, Any Pin to Ground ........................ -0.5 V to V
CC
+ 0.5 V
Free Air Operating Temperature Range, T
A
................ -55°C to +100°C
Storage Temperature, T
S
............................................ -65°C to +125°C
Maximum Solder Temperature, 1.59 mm (0.063 in.)
Below Seating Plane, t < 5 sec. ............................................... 260°C
Applications
• Military Equipment
• Avionics
• High Reliability Industrial
Equipment
ESD WARNING: THE HMDL-2416 IS IMPLEMENTED IN A STANDARD CMOS PROCESS
WITH DIODE PROTECTION OF ALL INPUTS. STANDARD PRECAUTIONS FOR HANDLING
CMOS DEVICES SHOULD BE OBSERVED.
2
Package Dimensions
Recommended Operating Conditions
Parameter
Supply Voltage
Input Voltage High
Input Voltage Low
Symbol
V
CC
V
IH
V
IL
Min.
4.5
2.0
Nom.
5.0
Max.
5.5
0.8
Units
V
V
V
3
DC Electrical Characteristics over Operating Temperature Range
Typical Values
Parameter
I
CC
4 Digits ON
(10 Seg/Digit)
[1,2]
I
CC
Cursor
[2,3,4]
I
CC
Blank
Input Current, Max.
Thermal Resistance
Junction to Case
Symbol
I
CC
I
CC
(CU)
I
CC
(BL)
I
IL
RΘ
J-C
Units
mA
mA
mA
µA
°C/W/Device
-55
°
C
120
170
1.8
22
25
°
C
85
125
1.5
17
20
+100
°
C
70
105
1.3
12
Test Conditions
V
CC
= 5.0 V
V
CC
= 5.0 V
V
CC
= 5.0 V
BL = 0.8 V
V
CC
= 5.0 V
V
IN
= 0.8 V
Guaranteed Values
25
°
C
V
CC
= 5.0 V
115
165
3.5
30
575
Maximum Over Operating
Temperature Range
V
CC
= 5.5 V
167
225
8.0
40
918
5 x 10
-8
Parameter
I
CC
4 Digits ON (10 Seg/Digit)
[1,2]
I
CC
Cursor
[2,3,4]
I
CC
Blank
Input Current, Max.
Power Dissipation
[5]
Leak Rate
Symbol
I
CC
I
CC
(CU)
I
CC
(BL)
I
IL
P
D
LR
Units
mA
mA
mA
µA
mW
cc/sec
Notes:
1. “%” illuminated in all four characters.
2. Measured at five seconds.
3. Cursor character is sixteen segments and DP ON.
4. Cursor operates continuously over operating temperature range.
5. Power Dissipation = V
CC •
I
CC
(10 seg.).
AC Timing Characteristics over Temperature at V
CC
= 4.5 V
[1]
Symbol
1 t
AS
2 t
WD
3 t
W
4 t
DS
5 t
DH
6 t
AH
7 t
CEH
8 t
CES
9 t
CLR
10 t
ACC
Parameter
Address Setup Time
Write Delay Time
Write Time
Data Setup Time
Data Hold Time
Address Hold Time
Chip Enable Hold Time
Chip Enable Setup Time
Clear Time
Access Time
Refresh Rate
-20
°
C t
MIN
90
10
80
40
40
40
40
90
2.4
130
420-790
25
°
C t
MIN
115
15
100
60
45
45
45
115
3.5
160
310-630
70
°
C t
MIN
150
20
130
80
50
50
50
150
4.0
200
270-550
Units
ns
ns
ns
ns
ns
ns
ns
ns
ms
ns
Hz
Note:
1. These parameters are guaranteed by design but are not tested.
4
Optical Characteristics
Parameter
Peak Luminous Intensity per Digit,
8 segments ON (character average)
Peak Wavelength
Dominant Wavelength
Off Axis Viewing Angle
Digit Size
Symbol
I
V
Peak
λ
Peak
λ
d
Min.
0.2
Typ.
0.6
Units
mcd
Test Conditions
V
CC
= 5.0 V,
“*” illuminated in all 4 digits
(25°C)
655
640
±
65
3.81
nm
nm
degrees
mm
Timing Diagram
Character Font Description
Relative Luminous Intensity vs.
Temperature
5
Electrical Description
Display Internal Block
Diagram
Figure 1 shows the internal block
diagram for the HMDL-2416
display. The CMOS IC consists of
a four-word ASCII memory, a
four-word cursor memory, a 64-
word character generator, 17
segment drivers, four digit drivers,
and the scanning circuitry
necessary to multiplex the four
monolithic LED characters. In
normal operation, the divide-by-
four counter sequentially
accesses each of the four RAM
locations and simultaneously
enables the appropriate display
digit driver. The output of the
RAM is decoded by the character
generator which, in turn, enables
the appropriate display segment
drivers. For each display location,
the cursor enable (CUE) selects
whether the data from the ASCII
RAM (CUE = 0) or the stored
cursor (CUE = 1) is to be
displayed. The cursor character is
denoted by all sixteen segments
and the DP ON. Seven-bit ASCII
data is stored in RAM. Since the
display uses a 64-character
decoder, half of the possible 128
input combinations are invalid.
For each display location where
D
5
= D
6
in the ASCII RAM, the
display character is blanked. The
entire display is blanked when
BL = 0.
Data is loaded into the display
through the data inputs (D
6
-D
0
),
digit selects (A
1
, A
0
), chip
enables (CE
1
, CE
2
), cursor select
(CU), and write (WR). The cursor
select (CU) determines whether
data is stored in the ASCII RAM
(CU = 1) or cursor memory
(CU = 0). When CE
1
= CE
2
=
WR = 0 and CU = 1, the informa-
tion on the data inputs is stored
in the ASCII RAM at the location
specified by the digit selects (A
1
,
A
0
). When CE
1
= CE
2
= WR = 0
and CU = 0, the information on
the data input, D
0
, is stored in
the cursor at the location speci-
fied by the digit selects (A
1
, A
0
).
If D
0
= 1, a cursor character is
stored in the cursor memory. If
D
0
= 0, a previously stored
cursor character will be removed
from the cursor memory.
If the clear input (CLR) equals
zero for one internal display
cycle (4 ms minimum), the data
in the ASCII RAM will be
rewritten with zeroes and the
display will be blanked. Note that
the blanking input (BL) must be
equal to logical one during this
time.
Data Entry
Figure 2 shows a truth table for
the HMDL-2416 display. Setting
the chip enables (CE
1
, CE
2
) to
their low state and the cursor
select (CU) to its high state will
enable data loading. The desired
data inputs (D
6
-D
0
) and address
inputs (A
1
, A
0
) as well as the chip
enables (CE
1
, CE
2
) and cursor
select (CU) must be held stable
during the write cycle to ensure
that the correct data is stored
into the display. Valid ASCII data
codes are shown in Figure 3. The
display accepts standard seven-
bit ASCII data. Note that D
6
= D
5
for the codes shown in Figure 2.
If D
6
= D
5
during the write cycle,
then a blank will be stored in the
display. Data can be loaded into
the display in any order. Note
that when A
1
= A
0
= 0, data is
stored in the furthest right-hand
display location.
Cursor Entry
As shown in Figure 2, setting the
chip enables (CE
1
, CE
2
) to their
low state and the cursor select
(CU) to its low state will enable
cursor loading. The cursor
character is indicated by the
display symbol having all 16
segments and the DP ON. The
least significant data input (D
0
),
the digit selects (A
1
, A
0
), the chip
enables (CE
1
, CE
2
), and the
cursor select (CU) must be held
stable during the write cycle to
ensure that the correct data is
stored in the display. If D
0
is in a
low state during the write cycle,
then a cursor character will be
removed at the indicated
location. If D
0
is in a high state
during the write cycle, then a
cursor character will be stored at
the indicated location. The
presence or absence of a cursor
character does not affect the
ASCII data stored at that loca-
tion. Again, when A
1
= A
0
= 0,
the cursor character is stored in
the furthest right-hand display
location.
All stored cursor characters are
displayed if the cursor enable
(CUE) is high. Similarly, the
stored ASCII data words are
displayed, regardless of the
cursor characters, if the cursor
enable (CUE) is low. The cursor
enable (CUE) has no effect on
the storage or removal of the
cursor characters within the
display. A flashing cursor is
displayed by pulsing the cursor
enable (CUE). For applications
not requiring a cursor, the cursor
enable (CUE) can be connected
to ground and the cursor select
(CU) can be connected to V
CC
.
This inhibits the cursor function
and allows only ASCII data to be
loaded into the display.
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