datasheet: pdf

NTE7443
Integrated Circuit
TTL − 4−Line−to−10−Line Excess−3−to−Decimal Decoder
Description:
The NTE7443 is a monolithic Excess−3−to−Decimal decoder in a 16−Lead plastic DIP type package
that consists of eight inverters and ten four−input NAND gates. The inverters are connected in pairs
to make BCD input data available for decoding by the NAND gates. Full decoding of valid input logic
ensures that all outputs remain off for all invalid input conditions.
The NTE7443 Excess−3−to−Decimal decoder features inputs and outputs that are compatible with
most TTL and other saturated low−level logic circuits. DC noise margins are typically one volt.
Features:
D All Outputs are High for Invalid Input Conditions
D Diode−Clamped Inputs
D Also for Application as:
4−Line−to−16−Line Decoder
3−Line−to−8−Line Decoder
Absolute Maximum Ratings: (Note 1)
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V
Operating Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0C to +70C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65C to +150C
Note 1. Unless otherwise specified, all voltages are referenced to GND.
Recommended Operating Conditions:
Parameter
Supply Voltage
High−Level Output Current
Low−Level Output Current
Operating Temperature Range
Symbol
VCC
IOH
IOL
TA
Min
4.75
−
−
0
Typ
5.0
−
−
−
Max
5.25
−800
16
+70
Unit
V
A
mA
C
Electrical Characteristics: (Note 2, Note 3)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
High Level Input Voltage
VIH
2
−
−
V
Low Level Input Voltage
VIL
−
−
0.8
V
Input Clamp Voltage
VIK
VCC = MIN, II = −12mA
−
−
−1.5
V
High Level Output Voltage
VOH
VCC = MIN, VIH = 2V, VIL = 0.8V, IOH = -800A
2.4
3.4
Low Level Output Voltage
VOL
VCC = MIN, VIH = 2V, VIL = 0.8V, IOL = 16mA
−
0.2
V
0.4
V
Input Current
II
VCC = MAX, VI = 5.5V
−
−
1
mA
High Level Input Current
IIH
VCC = MAX, VI = 2.4V
−
−
40
A
Low Level Input Current
IIL
VCC = MAX, VI = 0.4V
−
−
−1.6
mA
Short−Circuit Output Current
IOS
VCC = MAX, Note 4
−18
−
−55
mA
Supply Current
ICC
VCC = MAX, Note 5
−
28
56
mA
Note 2. .For conditions shown as MIN or MAX, use the appropriate value specified under “Recommended
Operation Conditions”.
Note 3. All typical values are at VCC = 5V, TA = +25C.
Note 4. Not more than one output should be shorted at a time.
Note 5. ICC is measured with all outputs open and inputs grounded.
Switching Characteristics: (VCC = 5V, TA = +25C unless otherwise specified)
Parameter
Propagation Delay Time
(From A, B, C, or D input Through 2 Levels of Logic)
Symbol
tPHL
Propagation Delay Time
(From A, B, C, or D input Through 3 Levels of Logic)
Test Conditions
Min
Typ
Max
Unit
−
14
25
ns
tPHL
−
17
30
ns
Propagation Delay Time
(From A, B, C, or D input Through 2 Levels of Logic)
tPLH
−
10
25
ns
Propagation Delay Time
(From A, B, C, or D input Through 3 Levels of Logic)
tPLH
−
17
30
ns
RL = 400,
CL = 15pF
Function Tables:
No.
0
1
2
3
4
5
6
7
8
9
Invalid
D
L
L
L
L
L
H
H
H
H
H
H
H
H
L
L
L
Excess−3−Input
C
B
L
H
H
L
H
L
H
H
H
H
L
L
L
L
L
H
L
H
H
L
H
L
H
H
H
H
L
L
L
L
L
L
H = HIGH Level, L = LOW Level
A
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
0
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
1
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
2
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
3
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
Decimal Output
4
5
H
H
H
H
H
H
H
H
L
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
6
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
7
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
8
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
9
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
Pin Connection Diagram
0 1
16 VCC
1 2
2 3
15 A
14 B
3 4
13 C
4 5
12 D
5 6
11 9
6 7
10 8
GND 8
9 7
16
9
1
8
.870 (22.0) Max
.260 (6.6)
Max
.200
(5.08)
Max
.100 (2.54)
.700 (17.78)
.099 (2.5) Min