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Display Drivers
DM7856/DM8856. DM8857. DM7858/DM8858
BCD-to-7-segment LED drivers
general description
This series of 7-segment display drivers fulfills a
wide variety of requirements for most active high
(common cathode) Light Emitting Diodes (LEDs).
Each device fully decodes a 4-bit BCD input into
a number from 0 through 9 in the standard 7-
segment display format, and BCD numbers above
9 into unique patterns that verify operation. All
circuits operate off of a single 5.0V supply.
The DM7856/DM8856 has active-high, passive
pull-up outputs which provide a typical source
current of 6.0 mA at an output voltage of 1.7V.
The applications are the same as for the DM5448/
DM7448 except that more design freedom is
allowed with higher source current levels. This
circuit was designed to drive the MAN-4 or equiv-
alent type display directly without the use of
external current limit resistors.
The DM8857 has active-high outputs and is de-
signed to be used with common cathode LED's
in the multiplex mode. It provides a typical source
current of 50 mA at an output voltage of 2.3V.
In addition, with the use of an external current
limit resistor per segment, this circuit can be used
in higher current nonmultiplex LED applications.
The DM7858/DM8858 has active high outputs
with source current adjustable with the use of
external current limit resistors, one per segment.
This feature allows extreme flexibility in source
current value selection for either multiplex or
non-multiplex common cathode LED drive applica-
tions. It allows the system designer freedom to tailor
the drive current for his particular applications.
features
• Lamp-test input
• Leading/trailing zero suppression (RBI and
RBO)
• Blanking Input that may be used to modulate
lamp intensity or inhibit output
• TTL and DTL compatible
• Input clamping diodes
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connection diagram
Dual-In-Line and Flat Package
OUTPUTS
VI
11
1J iii I
-
IIII
· l' -'-' J.' r
B
CLAMP RI
RI
~ TEST OUTPUT IIIIPUT
INPUTS
TOP VIEW
II
t' !'
0A
-------
INPUTS
J.'
GND
Order Number DM7856J, DM8856J,
DM8857J, DM7858J, DM8858J
See Package 17
Order Numbar DM7856N, DM8856N,
DM7858N or DM8858N
Sea Package 23
Ordar Number DM7856W, DM8856W,
DM7858Wor DM8858W
See Package 28
output display
,C1.
'0'
101 /12131'-{/sJs/7/BlqJ::/~/L1~/t:1
1
SEGMENT IDENTifiCATION
I
Z3
4
Ii B 1 •
8 10 11 12 13 '4 Ii
IIUMERICAL DESIGNATIONS - RESULTANT DIIPlAYS
6-19

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00
Ln
00
00
absolute maximum ratings (Note 1) operating conditions
~
C
.......
Supply Voltage
7.0V Supply Voltage (Vee)
MIN
MAX
UNIT!!
00 Input Voltage
5.5V
DM7856, DM7858
4.5
5.5
V
~Ln
Storage Temperature Range
-65°C to +150o e
Lead Temperature (Soldenng, 10 seconds)
300°C
DM8856, DM8857, }
DM8858
4.75
5.25
~
Temperature (TA)
DM7856, DM7858
-55
+125
V
°e
C
DM8856, DM8857, }
DM8858
0
+70
°e
"Ln
00
Output Voltage
All CircUits
5.5 V
00 Output Sink Current (per Segment)
~
DM7856, DM8856
6.4 mA
C Output Source Curre!')t (per Segment)
DM8857
60 mA
(£)
DM7858, DM8858
50 mA
Ln
00
00
c~
....... electrical characteristics (Note 2) The following is applicable to all parts.
(£)
Ln
~~ PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
C Logical "1" Input Voltage
2.0 V
Logical "0" Input Votlage
0.8 V
Logical "1" Output Voltage
BI/RBO Node
Vee = Min, lOUT = -2001lA
24 37
V
Logical "0" Output Voltage at
BI/RBO Node
Logical "1" Input Current at any
Input Except BI/RBO Node
Vee = Min, liN = 8.0 mA
"
Vee = Max, V ,N = 2.4V
Vee = Max, V ,N = 5.5V
0.3 0.4 V
40 IlA
1.0 mA
Logical "0" Input Current
(Except BI/RBO Node)
Vee = Max, V ,N = O.4V
-1.6 mA
Logical "0" Input Current
BI/RBO Node
Vee = Max, V ,N = O.4V
-4.2 mA
Output Short Circuit Current at
BI/RBO Node
Vee = Max
-4.0 mA
Input Clamp Voltage
Vee = 5.0V, TA = 25°C, liN =-12mA
-1.5
V
output characteristics and supply current
DM7856/DM8856 (Note 2)
PARAMETER
Logical "0" Output Voltage
Outputs a through g
Logical "1" Load Current
Available, Outputs a through g
Output Short CirCUit Current
Outputs a through g (Note 3)
Supply Current
DM7856
DM8856
CONDITIONS
Vee = Mm, lOUT = 6.4 rnA
Vee = 5 OV, V OUT = 1.7V
Vee = Max
Vee = Max
MIN
TYP
0.25
-4.7
-u0
-12
90
90
MAX
0.4
-7.5
-15
120
130
UNITS
V
mA
mA
mA
mA
6·20

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output characteristics and supply current (con't)
DM8857, DM7858/DM8858 (Notes 2 and 3)
PARAMETER
Logical "1" Load Current
Available, Outputs a through g
DM8857
DM7858 (Note 4)
DM8858 (Note 4)
Supply Current
CONDITIONS
Vee ~ 5.0V, V OUT ~ 23V
Vee ~ 5 OV, lOUT ~ -50 rnA
Vee ~ 5 OV, lOUT ~ -50 rnA
Vee;::: Max
MIN
TYP
-40
27 32
2.9 32
MAX
-60
60
UNITS
rnA
V
V
rnA
Note 1: "Absolute Maximum Ratings" are those values beyond which the safety of the device cannot be guaranteed.
They are not meant to imply that the devices' should be operated at these limits. The table of "Electrical Characteristics"
provides conditions for actual device operation.
Note 2: Unless otherwise specified mmlmax limits apply across the -5SoC to +12SoC temperature range for DM7856,
and OM7858 and across the O°C to +70°C range for OM8856, DM8857, and OM8858. All tYPlcalsare given for VCC ~ S.OV
and TA ~ 2SOC.
Note 3: Care must be taken in not shorting the outputs to ground while they are In the "1" state because excessive current
flow would result from the Darlington upper stages.
Note 4: Special care must be taken In the use of the DM7858 ceramic (J) and the DM88~8 plastic (N) DIP'swith regard to
not exceeding the maximum operating junction temperature of the devices. The maximum junction temperature of the
DM7858J IS 150°C and must be derated based on a thermal resistance of 80°C/watt, junction to ambient. The maximum
junctlor) temperature for the DM8858N IS 150°C and must be derated based on a thermal resistance of 140°C/watt junction
to ambient.
truth table
DECIMAL
OR
FUNCTION
o
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
BI
RBI
LT
LT
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
X
1
o
INPUTS
I OUTPUTS
RBI o C B A Bl/RBO a b
d
9 NOTE
1 o0 o0
1
1111 11o
1
X o0 o1 1 0 1 1 oooo 1
X o0 1 0 1 1 1 o1 1 o 1
X o0 1 1 1 1 1 1 1 oo1
X o1o0
1 0 1 1 oo1 1
X o1 o1 1 1 o1 1 o1 1
X o1 10 1 0 o1 1 1 1 1
X o1 1 1 1 1 1 1 oooo
X 1 0 o0 1 1 1 1 1 1 1 1
X 1 0 o1 1 1 1 1oo1 1
X 1 0 1 0 1 0 oo1 1 o 1
X 1 0 1 1 1 0 o 1 1 oo1
X 1 1 o0 1 0 1 ooo 1 1
X 1 1 o 1 1 1 oo1 o 1 1
X 1 1 1 0 1 0 oo1 1 1 1
X 1 1 1 1 1 0 oooooo
X XXX X 0 0 ooooo o 2
o o0 o0 0 0 oooooo 3
X XXX X
1
1111111
4
Note 1: BI/ABO IS wlre~AND logic serving as blanking Input (Btl and/or rlppJe~blanking output (RBO). The blanking Input (BI)
must be open or held at a logical 1 when output functions 0 through 15 are desired, and the npple~blanklng Input (RBI)
must be open or at a logical 1 If blanking of a decimal 0 IS not desired. X = Input may be high or low.
Note 2: When a logical 0 IS applied directly to the blanking Input (forced condition) all segment outputs go to a logical 1
regardless of the state of any other mput condition
Note 3: When the npple~blanking Input (RBI) and Inputs A, B, C, and D are at logical 0, with the lamp test Input at logical 1,
all segment outputs go to a logical 1 and the npple~blanking output (RBO) goes to a logical 0 (response condition).
Note 4: When the blanking Input/npple~blanklng output (BIIRBO) IS open or held at a logical 1, and a logical 0 is applied to
the lamp~test Input, all segment outputs go to a logical O.
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6-21

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co
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6-22