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BCD-to-Decimal Decoder
High-Voltage Silicon-Gate CMOS
The IW4028B types are BCD-to-decimal or binary-to-octal
decoders consisting of buffering on all 4 inputs, decoding-logic gates,
and 10 output buffers. A BCD code applied to the four inputs, A0 to
A3 results in a high level at the selected one of 10 decimal decoded
outputs. Similarly, a 3-bit binar y code ap plie d to i nputs A0 thr ough A2
is decoded in octal code at output 0 to7 if A3=“0”. High drive
capability is provided at all outputs to enhance dc and dynamic
performance i n high fan-out appli cations.
•
BCD-to-decimal decoding or binary-to-octal decoding
•
Operating Voltage Range: 3.0 to 18 V
•
Maximum input current of 1 µA at 18 V over full package-
temperature range; 100 nA at 18 V and 25°C
•
Noise margin (over full package temperature range):
1.0 V min @ 5.0 V supply
2.0 V min @ 10.0 V supply
2.5 V min @ 15.0 V supply
TECHNICAL DATA
IW4028B
ORDERING INFORMATION
IW4028BN Plastic
IW4028BD SOIC
TA = -55° to 125° C for all packages
PIN ASSIGNMENT
LOGIC DIAGRAM
PIN 16=V
PIN 8= GND
CC
59
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IW4028B
MAXIMUM RATINGS
*
Symbol Parameter Value Unit
V
CC
V
V
OUT
I
IN
P
P
DC Supply Voltage (Referenced to GND) -0.5 to +20 V
DC Input Voltage (Referenced to GND) -0.5 to VCC +0.5 V
IN
DC Output Voltage (Referenced to GND) -0.5 to VCC +0.5 V
DC Input Current, per Pin
Power Dissipation in Still Air, Plastic DIP+
D
SOIC Package+
Power Dissipation per Output Transistor 100 mW
D
±
10
750
500
Tstg Storage Temperature -65 to +150
T
Lead Temperature, 1 mm from Case for 10 Seconds
L
260
(Plastic DIP or SOIC Package)
*
Maximum Ratings are those values beyond which damage to the device may occur.
Functional operation should be restricted to the Recommended Operating Conditions.
+Derating - Plastic DIP: - 10 mW/°C from 65° to 125°C
SOIC Package: : - 7 mW/°C from 65° to 125°C
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Min Max Unit
V
VIN, V
T
CC
A
DC Supply Voltage (Referenced to GND) 3.0 18 V
DC Input Voltage, Output Voltage (Referenced to GND) 0 V
OUT
Operating Temperature, All Package Types -55 +125
CC
mA
mW
°
C
°
C
V
°
C
This device c ontains p rote ction ci rcuitr y to guard a gainst damage d ue to high st atic voltages or electr ic
fields. However, precautions must be taken to avoid applications of any voltage higher than maximum rated
voltages to this high-impedance circuit. For proper operation, V
GND≤(V
IN
or V
OUT
)≤VCC.
Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or V
and V
IN
should be constrained to the range
OUT
CC
Unused outputs must be left open.
60
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IW4028B
DC ELECTRICAL CHARACTERISTICS
(Voltages Referenced to GND)
Symbol Parameter Test Conditions V
V
V
V
IH
IL
OH
Minimum High-Level
Input Voltage
Maximum Low -Level
Input Voltage
Minimum High-Level
V
= 0.5 V or V
OUT
V
= 1.0 V or V
OUT
V
= 1.5 V or V
OUT
V
= 0.5 V or V
OUT
V
= 1.0 V or V
OUT
V
= 1.5 V or V
OUT
VIN=GND or V
CC
CC
CC
CC
CC
CC
CC
- 0.5V
- 1.0 V
- 1.5V
- 0.5V
- 1.0 V
- 1.5V
Output Voltage
V
OL
Maximum Low-Level
VIN=GND or V
CC
Output Voltage
I
IN
Maximum Input
VIN= GND or V
CC
Leakage Current
I
CC
Maximum Quiesce nt
VIN= GND or V
CC
Supply Current
(per Package)
I
OL
I
OH
Minimum Output Low
(Sink) Current
Minimum Output
High (Source) Current
VIN= GND or V
UOL=0.4 V
U
=0.5 V
OL
U
=1.5 V
OL
VIN= GND or V
UOH=2.5 V
U
=4.6 V
OH
U
=9.5 V
OH
U
=13.5 V
OH
CC
CC
V
5.0
10
15
5.0
10
15
5.0
10
15
5.0
10
15
18
5.0
10
15
20
5.0
10
15
5.0
5.0
10
15
CC
≥
14.95
Guaranteed Limit
-55°C25°C
3.5
7
11
1.5
3
4
4.95
9.95
3.5
7
11
1.5
3
4
4.95
9.95
14.95
0.05
0.05
0.05
±
0.1
5
10
20
100
0.64
1.6
4.2
-2
-0.64
-1.6
-4.2
0.05
0.05
0.05
±
0.1
5
10
20
100
0.51
1.3
3.4
-1.6
-0.51
-1.3
-3.4
≤
125
°
C
3.5
7
11
1.5
3
4
4.95
9.95
14.95
0.05
0.05
0.05
±
1.0
150
300
600
3000
0.36
0.9
2.4
-1.15
-0.36
-0.9
-2.4
Unit
V
V
V
V
µ
A
µ
A
mA
mA
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IW4028B
AC ELECTRICAL CHARACTERISTICS
(CL=50pF, RL=200kΩ, Input tr=tf=20 ns)
Symbol Parameter V
t
PHL
, t
Maximum Propagation Delay, Input A to Output
PLH
Y (Figure 1)
t
THL
, t
Maximum Output Transition Time, Any Output
TLH
(Figure 1)
C
IN
Maximum Input Capacitance - 7.5 pF
FUNCTION TABLE
Inputs Outputs
A3 A2 A1 A0 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 Y8 Y9
LLLLHLLLLLLLLL
LLLHLHLLLLLLLL
LLHLLLHLLLLLLL
LLHHLLLHLLLLLL
LHLLLLLLHLLLLL
LHLHLLLLLHLLLL
LHHLLLLLLLHLLL
LHHHLLLLLLLHLL
HLLLLLLLLLLLHL
HLLHLLLLLLLLLH
HLHLLLLLLLLLLL
HLHHLLLLLLLLLL
HHLLLLLLLLLLLL
HHLHLLLLLLLLLL
HHHLLLLLLLLLLL
HHHHLLLLLLLLLL
V
5.0
10
15
5.0
10
15
CC
≥
Guaranteed Limit
-55°C25°C
350
160
120
200
100
80
350
160
120
200
100
80
≤
125°C
700
320
240
400
200
160
Unit
ns
ns
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Figure 1. Switching Waveforms
EXPANDED LOGIC DIAGRAM
IW4028B
63
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