NTE74141 Integrated Circuit TTL − BCD−to−Decimal Decoder

NTE74141
Integrated Circuit
TTL − BCD−to−Decimal Decoder/Driver
16−Lead DIP Type Package
Description:
The NTE74141 is a second−generation BDC−to−decimal decoder in a 16−lead DIP type package designed specifically to drive cold−cathode indicator tubes. This decoder demonstrates an improved
capability to minimize switching transients in order to maintain a stable display.
Full decoding is provided fo all possible input states. Fo binary inputs 10 through 15, all the outputs
are off. Therefore the NTE74141, combined with a minimum of external circuitry, can use these invalid
codes in blanking leading− and/or trailing−edge zeros in a display. The ten high−performance NPN
output transistors have a maximum reverse current of 150 microamperes at 55 volts.
Low forward−impedance diodes are also provided for each input to clamp negative−voltage transitions in order to minimize transmission−line effects. Power dissipation is typically 80 milliwatts. The
NTE74141 is characterized for operation over the temperature range of 0 to +70C.
Features:
D Drives Gas−Filled Cold−Cathode Indicator Tubes Directly
D Fully Decoded Inputs Ensures all Outputs are Off for Invalid Codes
D Input Clamping Diodes Minimize Transmission−Line Effects
Absolute Maximum Ratings: (TA = 0 to +70C unless otherwise specified)
Supply Voltage (Note 1), VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V
Current Into Any Output (Off−State) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2mA
Operating Free−Air Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to +70C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65 to +150C
Note 1. Voltage values are with respect to network ground terminal.
Recommended Operating Characteristics:
Parameter
Supply Voltage
Symbol
VCC
Off−State Output Voltage
Operating Free−Air Temperature
TA
Test Conditions
Min
Typ
Max
Unit
4.75
5.0
5.25
V
−
−
60
V
0
−
70
C
Electrical Characteristics: (TA = 0 to +70C, Note 2, Note 3 unless otherwise specified)
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 = −5mA
−
−
−1.5
V
On−State Output Voltage
VO(on)
VCC = MIN, IO = 7mA
−
−
2.5
V
Off−State Output Voltage for
Input Counts 0 Thru 9
VO(off)
VCC = MAX, IO = 0.5mA
60
−
−
V
Off−State Reverse Current
IO(off)
VCC = MAX, VO = 55V
−
−
50
A
Off−State Reverse Current for
Input Counts 10 Thru 15
IO(off)
VCC = MAX,
VO = 30V
TA = +55C
−
−
5
A
TA = +70C
−
−
15
A
Input Current at Maximum Input Voltage
II
VCC = MAX, VI = 5.5V
−
−
1
mA
High−Level Input Current
A Input
IIH
VCC = MAX, VI = 2.4V
−
−
40
A
−
−
80
A
−
−
−1.6
mA
−
−
−3.2
mA
−
16
25
mA
B, C, or D Input
Low−Level Input Current
A Input
IIL
VCC = MAX, VI = 0.4V
B, C, or D Input
Supply Current
ICC
VCC = MAX, Note 4
Note 2. For conditions shown as MIN or MAX, use the appropriate value specified under “Recommended
Operating Conditions”.
Note 3. Typical value is at VCC = 5V, TA = +25C.
Note 4. ICC is measured with all inputs grounded and outputs open.
Function Table:
Input
Output
ON {
A
B
C
D
L
L
L
L
0
L
L
L
H
1
L
L
H
L
2
L
L
H
H
3
L
H
L
L
4
L
H
L
H
5
L
H
H
L
6
L
H
H
H
7
H
L
L
L
8
H
L
L
H
9
H
L
H
L
NONE
H
L
H
H
NONE
H
H
L
L
NONE
H
H
L
H
NONE
H
H
H
L
NONE
H
H
H
H
NONE
H = HIGH Level, L = LOW Level
{ All other outputs are OFF
Pin Connection Diagram
Output 8 1
16 Output 0
Output 9 2
Input A 3
15 Output 1
14 Output 5
Input D 4
13 Output 4
VCC 5
12 GND
Input B 6
11 Output 6
Input C 7
10 Output 7
Output 2 8
9 Output 3
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