NTE74LS445 Integrated Circuit TTL − BCD−to−Decimal Decoder

NTE74LS445
Integrated Circuit
TTL − BCD−to−Decimal Decoder/Driver
with Open Collector Outputs
Description:
The NTE74LS445 is a monolithic BCD−to−Decimal Decoder/Driver 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 BCD
input logic ensures that all outputs remain off for all invalid binary input conditions. This decoder features high−performance, NPN output transistors designed for use as indicator/relay drivers or as
open−collector logic−circuit drivers. Each o the output transistors will sink up to 80mA of current. each
input is one Series 74LS standard load. Inputs and outputs are entirely compatible for use with TTL
logic circuitry, and the outputs are compatible for interfacing with most MOS integrated circuits. Power
dissipation is typically 35mW.
Features:
D Low Voltage Version of NTE74LS145
D Full Decoding of Input Logic
D Sink Current Capability: 80mA
D All Outputs are Off for Invalid BCD Input Condition
D Low Power Dissipation: 35mW (Typ)
Absolute Maximum Ratings: (Note 1)
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
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
Symbol
VCC
VO(off)
TA
Supply Voltage
Off−State Output Voltage
Operating Temperature Range
Min
4.75
−
0
Typ
5.0
−
−
Max
5.25
7
+70
Unit
V
Min
Typ
Max
Unit

C
Electrical Characteristics: (Note 2, Note 3)
Parameter
Symbol
Test Conditions
High Level Input Voltage
VIH
2
−
−
V
Low Level Input Voltage
VIL
−
−
0.8
V
Input Clamp Voltage
VIK
VCC = MIN, II = −18mA
−
−
−1.5
V
−
−
250
A
IOL = 12mA
−
0.25
0.4
V
IOL = 24mA
−
0.35
0.5
V
IOL = 80mA
−
2.3
3.0
V
Off−State Output Current
IO(off)
VCC = MIN, VIH = 2V, VIL = MAX, VOH = 7V
On−State Output Voltage
VO(on)
VCC = MIN, VIH = 2V,
VIL = MAX
Input Current
II
VCC = MAX, VI = 7V
−
−
0.1
mA
High Level Input Current
IIH
VCC = MAX, VI = 2.7V
−
−
20
A
Low Level Input Current
IIL
VCC = MAX, VI = 0.4V
−
−
−0.4
mA
Supply Current
ICC
VCC = MAX, Note 4
−
7
13
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. ICC is measured with all inputs grounded and outputs open.
Switching Characteristics: (VCC = 5V, TA = +25C unless otherwise specified)
Parameter
Propagation Delay Time
Symbol
tPLH
Test Conditions
RL = 665, CL = 45pF
tPHL
Min
Typ
Max
Unit
−
−
50
ns
−
−
50
ns
Function Tables:
No.
0
1
2
3
4
5
6
7
8
9
Invalid
D
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
Inputs
C
B
L
L
L
L
L
H
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
A
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
0
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H = HIGH Level (off), L = LOW Level (on)
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