HCF4028B
BCD TO DECIMAL DECODER
s
s
s
s
s
s
s
s
s
BCD TO DECIMAL DECODING OR BINARY
TO OCTAL DECODING
HIGH DECODED OUTPUT DRIVE
CAPABILITY
"POSITIVE LOGIC" INPUTS AND OUTPUTS:
DECODED OUTPUTS GO HIGH ON
SELECTION
MEDIUM SPEED OPERATION : t
PHL
, t
PLH
=
80ns (Typ.) at V
DD
= 10V
QUIESCENT CURRENT SPECIF. UP TO 20V
STANDARDIZED SYMMETRICAL OUTPUT
CHARACTERISTICS
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
SOP
ORDER CODES
PACKAGE
DIP
SOP
TUBE
HCF4028BEY
HCF4028BM1
DESCRIPTION
HCF4028B is a monolithic integrated circuit
fabricated in Metal Oxide Semiconductor
technology available in DIP and SOP packages.
HCF4028B is a BCD to DECIMAL or BINARY to
OCTAL decoder consisting of buffering on all 4
PIN CONNECTION
O
so
b
te
le
ro
P
uc
d
s)
t(
so
b
-O
inputs, decoding logic gates, and 10 output
buffers.
A BCD code applied to the four inputs, A to D,
results in a high level at the selected one of 10
decimal decoded outputs. Similarly, a 3-bit binary
code applied to inputs A through C is decoded in
octal code at output 0 to 7 if D = "0". High drive
capability is provided at all outputs to enhance dc
and dynamic performance in high fan-out
applications.
P
te
le
od
r
HCF4028M013TR
s)
t(
uc
T&R
September 2002
1/10
HCF4028B
LOGIC DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol
V
DD
V
I
I
I
P
D
T
op
T
stg
Supply Voltage
DC Input Voltage
DC Input Current
Power Dissipation per Package
Power Dissipation per Output Transistor
Operating Temperature
Storage Temperature
Parameter
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.
RECOMMENDED OPERATING CONDITIONS
Symbol
b
O
V
DD
V
I
T
op
so
te
le
ro
P
uc
d
s)
t(
b
-O
so
P
te
le
od
r
Value
s)
t(
uc
Unit
V
V
mA
mW
mW
°C
°C
-0.5 to +22
-0.5 to V
DD
+ 0.5
±
10
200
100
-55 to +125
-65 to +150
Parameter
Value
3 to 20
0 to V
DD
-55 to 125
Unit
V
V
°C
Supply Voltage
Input Voltage
Operating Temperature
3/10
HCF4028B
TEST CIRCUIT
C
L
= 50pF or equivalent (includes jig and probe capacitance)
R
L
= 200KΩ
R
T
= Z
OUT
of pulse generator (typically 50Ω)
WAVEFORM : PROPAGATION DELAY TIMES
(f=1MHz; 50% duty cycle)
O
so
b
te
le
ro
P
uc
d
s)
t(
so
b
-O
P
te
le
od
r
s)
t(
uc
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
excess-3code.
or
a
15
expressed
in
5/10
嵌入式系统
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