HCF4056B
BCD TO 7 SEGMENT DECODER /DRIVER
WITH STROBED LATCH FUNCTION
s
s
s
s
s
s
s
s
s
s
QUIESCENT CURRENT SPECIF. UP TO 20V
OPERATION OF LIQUID CRYSTALS WITH
CMOS CIRCUITS PROVIDES ULTRA LOW
POWER DISPLAY.
EQUIVALENT AC OUTPUT DRIVE FOR
LIQUID CRYSTAL DISPLAYS - NO
EXTERNAL CAPACITOR REQUIRED
VOLTAGE DOUBLING ACROSS DISPLAY
[(V
DD
- V
EE
) = 18V] RESULTS IN EFFECTIVE
36V (p-p) DRIVE ACROSS SELECTED
DISPLAY SEGMENTS
LOW OR HIGH OUTPUT LEVEL DC DRIVE
FOR OTHER TYPES OF DISPLAYS
ONE CHIP LOGIC LEVEL CONVERSION
FOR DIFFERENT INPUT AND OUTPUT
LEVEL SWINGS
FULL DECODING OF ALL INPUT
COMBINATIONS : "0 - 9, L, H, P, A" AND
BLANK POSITIONS
INPUT LEAKAGE CURRENT
I
I
= 100nA (MAX) AT V
DD
= 18V T
A
= 25°C
100% TESTED FOR QUIESCENT CURRENT
MEETS ALL REQUIREMENTS OF JEDEC
JESD13B "STANDARD SPECIFICATIONS
FOR DESCRIPTION OF B SERIES CMOS
DEVICES"
DIP
ORDER CODES
PACKAGE
DIP
SOP
TUBE
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DESCRIPTION
HCF4056B is a monolithic integrated circuit
fabricated in Metal Oxide Semiconductor
technology available in DIP and SOP packages.
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HCF4056B is a single digit BCD to 7 segment
decoder driver circuit that provides a level shifting
function on the chip. This feature permits the BCD
input-signal swings (V
DD
to V
SS
) to be the same
as or different from the 7-segment output signal
swings (V
DD
to V
EE
). For example, the BCD
input-signal swings (V
DD
to V
SS
) may be as low as
0 to -3V, whereas the output-display drive signal
swing (V
DD
to V
EE
) may be from 0 to -5V. If V
DD
to
V
EE
exceeds 15V, V
DD
to V
SS
should be at least
4V. The 7-segment outputs are controlled by the
DISPLAY-FREQUENCY (DF) input, which causes
the selected segment outputs to be low, high, or a
square wave output (for liquid crystal displays).
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HCF4056BEY
HCF4056BM1
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T&R
HCF4056M013TR
PIN CONNECTION
September 2002
1/10
HCF4056B
When the DF input is low, the output segments will
be high when selected by the BCD inputs. When
the DF input is high, the output segments will be
low when selected by the BCD inputs. When a
square wave is present at the DF input, the
selected segments will have a square wave output
that is 180° out of phase with the DF input. Those
segments which are not selected will have a
square wave output that is in phase with the input.
DF square wave repetition rates for liquid crystal
displays usually range from 30Hz (well above
flicker rate) to 200Hz (well below the upper limit of
the liquid crystal frequency response). HCF4056B
provides a strobed-latch function at the BCD
inputs. The decoding of all input combinations in
INPUT EQUIVALENT CIRCUIT
this device provides displays of 0 to 9 as well as L,
P, H, A, -, and a blank position. The level shifted
function permits the use of different input and
output signal swings. The input swings from a low
level of V
SS
to a high level of V
DD,
while the
outputs swing from a low level of V
EE
to the same
high level of V
DD
. Thus, the input and output
swings can be selected independently of each
other over a 3 to 18V range. V
SS
may be
connected to V
EE
when no level-shift function is
required. The HCF4056B, however must be used
together with HCF4054B to provide the common
DF output.
PIN DESCRIPTION
PIN No
5, 3, 2, 4
SYMBOL
9, 10, 11, 12,
13, 15, 14
FUNCTIONAL DIAGRAM
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6
1
7
8
16
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2
0
, 2
1
, 2
2
, 2
3
BCD Inputs
a to g
7 - Segments Outputs
Display Frequency Input
Strobe Input
Negative Supply Voltage
Negative Supply Voltage
Positive Supply Voltage
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NAME AND FUNCTION
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DISPLAY
FREQ. IN
STROBE
V
EE
V
SS
V
DD
2/10
HCF4056B
TRUTH TABLE
INPUT CODE
2
3
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
2
2
L
L
L
L
H
H
H
H
L
L
L
L
H
H
H
H
2
1
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
2
0
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
a
H
L
H
H
L
H
H
H
H
H
L
L
H
H
L
L
b
H
H
H
H
H
L
L
H
H
H
L
H
H
H
L
L
c
H
H
L
H
H
H
H
H
H
H
L
H
L
H
L
L
OUTPUT STATE
d
H
L
H
H
L
H
H
L
H
H
H
L
L
L
L
L
e
H
L
H
L
L
L
H
L
H
L
H
H
H
H
L
L
f
H
L
L
L
H
H
H
L
H
H
H
H
H
H
L
L
g
L
L
H
H
H
H
H
L
H
H
L
H
H
H
H
L
DISPLAY
CHARACTER
0
1
2
3
4
5
6
7
8
9
L
H
P
A
-
BLANK
ABSOLUTE MAXIMUM RATINGS
Symbol
V
DD
V
I
I
I
P
D
T
op
T
stg
Supply Voltage
DC Input Voltage
DC Input Current
Parameter
Power Dissipation per Package
Power Dissipation per Output Transistor
Operating Temperature
Storage Temperature
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied.
All voltage values are referred to V
SS
pin voltage.
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RECOMMENDED OPERATING CONDITIONS
Symbol
V
DD
V
I
T
op
Supply Voltage
Input Voltage
Operating Temperature
Parameter
Value
3 to 20
0 to V
DD
-55 to 125
Unit
V
V
°C
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Value
-0.5 to +22
-0.5 to V
DD
+ 0.5
±
10
200
100
-55 to +125
-65 to +150
Unit
V
V
mA
mW
mW
°C
°C
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HCF4056B
DC SPECIFICATIONS
Test Condition
Symbol
Parameter
V
EE
(V)
-5
0
0
0
0
0
0
0
0
0
-5
0
0
5
0
0
-5
0
0
-5
0
0
0
V
I
(V)
0/5
0/10
0/15
0/20
0/5
0/10
0/15
5/0
10/0
15/0
0.5/4.5
1/9
1.5/18.5
0.5/4.5
9/1
1.5/18.5
4.5
9.5
13.5
0.4
0.5
1.5
V
O
(V)
V
SS
V
DD
(V) (V)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
T
A
= 25°C
Min.
Typ.
Max.
5
10
20
100
4.95
9.95
14.95
0.05
0.05
0.05
Value
-40 to 85°C -55 to 125°C Unit
Min.
Max.
150
300
600
3000
4.95
9.95
14.95
Min.
Max.
150
300
600
3000
I
L
Quiescent Current
V
OH
High Level Output
Voltage
Low Level Output
Voltage
High Level Input
Voltage
Low Level Input
Voltage
Output Drive
Current
Output Sink
Current
Input Leakage
Current (any input)
Input Capacitance
(any input)
V
OL
V
IH
V
IL
I
OH
I
OL
I
I
C
I
The Noise Margin for both "1" and "0" level is: 1V min. with V
DD
=5V, 2V min. with V
DD
=10V, 2.5V min. with V
DD
=15V
DYNAMIC ELECTRICAL CHARACTERISTICS
(T
amb
= 25°C, C
L
= 50pF, R
L
= 200KΩ, t
r
= t
f
= 20 ns)
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Symbol
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0/18
V
EE
(V)
-5
0
0
-5
0
0
0/5
0/10
0/15
0/5
0/10
0/15
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-
18
5
0.04
10
0.04
15
0.04
20
0.08
5
4.95
10 9.95
15 14.95
5
0.05
10
0.05
15
0.05
5
3.5
10
7
15
11
5
10
15
5 -0.38 -0.9
10 -0.38 -0.9
15 -1.27
-3
5
1.1
2.6
10
1.1
2.6
15
2.9
6.8
µA
so
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le
1.5
3
4
r
P
-0.28
-0.28
-0.95
0.82
0.82
2.17
3.5
7
11
d
o
1.5
3
4
uc
3.5
7
11
-0.28
-0.28
-0.95
0.82
0.82
2.17
s)
t(
0.05
0.05
0.05
1.5
3
4
V
V
V
V
mA
mA
±10
-5
±0.1
5
7.5
±1
±1
µA
pF
Test Condition
V
SS
(V)
0
0
0
0
0
0
V
DD
(V)
5
10
15
5
10
15
Min.
Value (*)
Typ.
650
575
375
100
100
75
Max.
1300
1150
750
200
200
150
Unit
Parameter
t
PHL
t
PLH
Propagation Delay
Time (any Input to
any Output)
t
THL
t
TLH
Transition Time
(any Output)
ns
ns
(*) Typical temperature coefficient for all V
DD
value is 0.3 %/°C.
4/10
HCF4056B
TYPICAL APPLICATIONS
FIGURE 1
: Display Driver Circuit
FIGURE 2
: Display Driver Waveforms.
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