Obsolete Product(s) - Obsolete Product(s)
HCF4028B
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DC SPECIFICATIONS
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
= 200K, t
r
= t
f
= 20 ns)
(*) Typical temperature coefficient for all V
DD
value is 0.3 %C.
Symbol Parameter
Test Conditions Value
Unit
V
I
(V)
V
O
(V)
I
O
(
µ
A)
V
DD
(V)
T
A
= 25°C
-40 to 85°C -55 to 125°C
Min. Typ. Max. Min. Max. Min. Max.
I
L
Quiescent Current 0/5 5 0.04 5 150 150
µ
A
0/10 10 0.04 10 300 300
0/15 15 0.04 20 600 600
0/20 20 0.08 100 3000 3000
V
OH
High Level Output
Voltage
0/5 <1 5 4.95 4.95 4.95
V0/10 <1 10 9.95 9.95 9.95
0/15 <1 15 14.95 14.95 14.95
V
OL
Low Level Output
Voltage
5/0 <1 5 0.05 0.05 0.05
V10/0 <1 10 0.05 0.05 0.05
15/0 <1 15 0.05 0.05 0.05
V
IH
High Level Input
Voltage
0.5/4.5 <1 5 3.5 3.5 3.5
V1/9 <1 10 7 7 7
1.5/18.5 <1 15 11 11 11
V
IL
Low Level Input
Voltage
0.5/4.5 <1 5 1.5 1.5 1.5
V9/1 <1 10 3 3 3
1.5/18.5 <1 15 4 4 4
I
OH
Output Drive
Current
0/5 2.5 5 -1.36 -3.2 -1.1 -1.1
mA
0/5 4.6 5 -0.44 -1 -0.36 -0.36
0/10 9.5 10 -1.1 -2.6 -0.9 -0.9
0/15 13.5 15 -3.0 -6.8 -2.4 -2.4
I
OL
Output Sink
Current
0/5 0.4 5 0.44 1 0.36 0.36
mA0/10 0.5 10 1.1 2.6 0.9 0.9
0/15 1.5 15 3.0 6.8 2.4 2.4
I
I
Input Leakage
Current
0/18 any input 18
±
10
-5
±
0.1
±
1
±
1
µ
A
C
I
Input Capacitance
any input 5 7.5 pF
Symbol Parameter
Test Condition Value (*) Unit
V
DD
(V)
Min. Typ. Max.
t
PHL
t
PLH
Propagation Delay Time
(Clock to "Out")
5 175 350
ns10 80 160
15 60 120
t
THL
t
TLH
Transition Time
(Carry Out Line)
5 100 200
ns10 50 100
15 25 50
Obsolete Product(s) - Obsolete Product(s)
HCF4028B
5/10
TEST CIRCUIT
C
L
= 50pF or equivalent (includes jig and probe capacitance)
R
L
= 200K
R
T
= Z
OUT
of pulse generator (typically 50
)
WAVEFORM : PROPAGATION DELAY TIMES (f=1MHz; 50% duty cycle)
TYPICAL APPLICATION
The circuit shown in fig. 1 converts any 4-bit code
to a decimal or hexadecimal code. Fig. 2 shows a
number of codes and the decimal or hexadecimal
number in these codes, which must be applied to
the input pins of HCF4028B to select a particular
output. For example: in order to get a "high" on
output 8 the input must be either an 8 expressed in
4-bit binary code or a 15 expressed in
excess-3code.
Obsolete Product(s) - Obsolete Product(s)
HCF4028B
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FIGURE 1 : CODE CONVERSION CIRCUIT
FIGURE 2 : CODE CONVERSION CHART
INPUTS
INPUT CODES
OUTPUT NUMBER
HEXA
DECIMAL
DECIMAL
DCBA
4 BIT BINARY
4 BIT GRAY
EXCESS 3
EXCESS 3 GRAY
AIKEN
4221
0123456789101112131415
LLLL00 00HLLLLLLLLLLLLLLL
LLLH11 11LHLLLLLLLLLLLLLL
LLHL23 022LLHLLLLLLLLLLLLL
LLHH32033 LLLHLLLLLLLLLLLL
LHLL47144 LLLLHLLLLLLLLLLL
LHLH562 3LLLLLHLLLLLLLLLL
LHHL6431 4LLLLLLHLLLLLLLLL
LHHH7542 LLLLLLLHLLLLLLLL
HLLL8155 LLLLLLLLHLLLLLLL
HLLH9146 5LLLLLLLLLHLLLLLL
HLHL101279 6LLLLLLLLLLHLLLLL
HLHH11138 5 LLLLLLLLLLLHLLLL
HHLL128956 LLLLLLLLLLLLHLLL
HHLH139 677LLLLLLLLLLLLLHLL
HHHL1411 888LLLLLLLLLLLLLLHL
HHHH1510 799LLLLLLLLLLLLLLLH

HCF4028BEY

Mfr. #:
Manufacturer:
STMicroelectronics
Description:
Encoders, Decoders, Multiplexers & Demultiplexers BCD-Decade Decoder
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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