M74HC4028
BCD TO DECIMAL DECODER
s
s
s
s
s
s
s
HIGH SPEED:
t
PD
= 20ns (TYP.) at V
CC
= 6V
LOW POWER DISSIPATION:
I
CC
= 4µA(MAX.) at T
A
=25°C
HIGH NOISE IMMUNITY:
V
NIH
= V
NIL
= 28 % V
CC
(MIN.)
SYMMETRICAL OUTPUT IMPEDANCE:
|I
OH
| = I
OL
= 4mA (MIN)
BALANCED PROPAGATION DELAYS:
t
PLH
≅
t
PHL
WIDE OPERATING VOLTAGE RANGE:
V
CC
(OPR) = 2V to 6V
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 4028
DIP
SOP
TSSOP
ORDER CODES
PACKAGE
DIP
SOP
TSSOP
TUBE
M74HC4028B1R
M74HC4028M1R
DESCRIPTION
The M74HC4028 is an high speed CMOS BCD
TO DECIMAL DECODER fabricated with silicon
gate C
2
MOS technology.
A BCD code applied to the four inputs (A to D)
provides a high level at the selected one of the
decimal decoded outputs. An illegal BCD code
such as eleven to fifteen gives a low level at all
outputs. The device also can be used as 3 TO 8
PIN CONNECTION AND IEC LOGIC SYMBOLS
O
so
b
te
le
r
P
uc
od
s)
t(
bs
-O
LINE DECODER, when D input is assigned as a
disable input.
The device is useful for code conversion, address
decoding, memory selection, demultiplexing, or
read out decoding.
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
et
l
o
P
e
od
r
M74HC4028RM13TR
M74HC4028TTR
s)
t(
uc
T&R
August 2001
1/9
M74HC4028
ABSOLUTE MAXIMUM RATINGS
Symbol
V
CC
V
I
V
O
I
IK
I
OK
I
O
Supply Voltage
DC Input Voltage
DC Output Voltage
DC Input Diode Current
DC Output Diode Current
DC Output Current
Parameter
Value
-0.5 to +7
-0.5 to V
CC
+ 0.5
-0.5 to V
CC
+ 0.5
±
20
±
20
±
25
±
50
500(*)
-65 to +150
300
Unit
V
V
V
mA
mA
mA
mA
mW
°C
°C
I
CC
or I
GND
DC V
CC
or Ground Current
P
D
Power Dissipation
T
stg
T
L
Storage Temperature
Lead Temperature (10 sec)
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
(*) 500mW at 65
°
C; derate to 300mW by 10mW/
°
C from 65
°
C to 85
°
C
RECOMMENDED OPERATING CONDITIONS
Symbol
V
CC
V
I
V
O
T
op
t
r
, t
f
Supply Voltage
Input Voltage
Output Voltage
Operating Temperature
Input Rise and Fall Time
Parameter
V
CC
= 2.0V
O
so
b
te
le
r
P
uc
od
s)
t(
bs
-O
V
CC
= 4.5V
V
CC
= 6.0V
l
o
te
e
r
P
0 to V
CC
0 to V
CC
od
2 to 6
Value
s)
t(
uc
Unit
V
V
V
°C
ns
ns
ns
-55 to 125
0 to 1000
0 to 500
0 to 400
3/9
M74HC4028
DC SPECIFICATIONS
Test Condition
Symbol
Parameter
V
CC
(V)
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
4.5
6.0
V
OL
Low Level Output
Voltage
2.0
4.5
6.0
4.5
6.0
I
I
I
CC
Input Leakage
Current
Quiescent Supply
Current
6.0
6.0
I
O
=-20
µA
I
O
=-20
µA
I
O
=-20
µA
I
O
=-4.0 mA
I
O
=-5.2 mA
I
O
=20
µA
I
O
=20
µA
I
O
=20
µA
I
O
=4.0 mA
I
O
=5.2 mA
V
I
= V
CC
or GND
V
I
= V
CC
or GND
T
A
= 25°C
Min.
1.5
3.15
4.2
0.5
1.35
1.8
1.9
4.4
5.9
4.18
5.68
2.0
4.5
6.0
4.31
5.8
0.0
0.0
0.0
0.17
0.18
0.1
0.1
0.1
0.26
0.26
1.9
4.4
5.9
4.13
5.63
0.1
0.1
Typ.
Max.
Value
-40 to 85°C
Min.
1.5
3.15
4.2
0.5
1.35
1.8
1.9
4.4
5.9
V
4.10
5.60
Max.
-55 to 125°C
Min.
1.5
3.15
4.2
0.5
1.35
1.8
Max.
V
Unit
V
IH
High Level Input
Voltage
Low Level Input
Voltage
High Level Output
Voltage
V
IL
V
V
OH
AC ELECTRICAL CHARACTERISTICS
(C
L
= 50 pF, Input t
r
= t
f
= 6ns)
Test Condition
Symbol
Parameter
t
TLH
t
THL
Output Transition
Time
t
PLH
t
PHL
Propagation Delay
Time
O
CAPACITIVE CHARACTERISTICS
Test Condition
Symbol
Parameter
V
CC
(V)
5.0
5.0
T
A
= 25°C
Min.
Typ.
5
39
Max.
10
Value
-40 to 85°C
Min.
Max.
10
-55 to 125°C
Min.
Max.
10
pF
pF
Unit
so
b
C
IN
C
PD
te
le
r
P
uc
od
2.0
4.5
6.0
2.0
4.5
6.0
V
CC
(V)
s)
t(
bs
-O
Min.
et
l
o
4
±
0.1
P
e
Value
od
r
0.1
0.33
0.33
±
1
40
s)
t(
uc
0.1
0.1
0.1
0.40
0.40
±
1
80
V
µA
µA
T
A
= 25°C
Typ.
30
8
7
96
24
20
Max.
75
15
13
185
37
31
-40 to 85°C
Min.
Max.
95
19
16
230
46
39
-55 to 125°C
Min.
Max.
110
22
19
280
56
48
Unit
ns
ns
Input Capacitance
Power Dissipation
Capacitance (note
1)
1) C
PD
is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. I
CC(opr)
= C
PD
x V
CC
x f
IN
+ I
CC
4/9
M74HC4028
TEST CIRCUIT
C
L
= 50pF or equivalent (includes jig and probe capacitance)
R
T
= Z
OUT
of pulse generator (typically 50Ω)
WAVEFORM : PROPAGATION DELAY TIMES
(f=1MHz; 50% duty cycle)
O
so
b
te
le
r
P
uc
od
s)
t(
bs
-O
et
l
o
P
e
od
r
s)
t(
uc
5/9
PCB Design
京公网安备 11010802033920号
EEWORLD
