MOTOROLA MC74F138D

MC54/74F138
1-OF-8 DECODER/
DEMULTIPLEXER
The MC54/74F138 is a high speed 1-of-8 Decoder/Demultiplexer. This device is ideally suited for high speed bipolar memory chip select address decoding. The multiple input enables allow parallel expansion to a 1-of-24 decoder using just three F138 devices or to a 1-of-32 decoder using four F138s
and one inverter.
• Demultiplexing Capability
• Multiple Input Enable for Easy Expansion
• Active Low Mutually Exclusive Outputs
• Input Clamp Diodes Limit High-Speed Termination Effects
1-OF-8 DECODER/
DEMULTIPLEXER
FAST SHOTTKY TTL
J SUFFIX
CERAMIC
CASE 620-09
CONNECTION DIAGRAM DIP (TOP VIEW)
VCC
O0
O1
O2
O3
O4
O5
O6
16
15
14
13
12
11
10
9
16
1
N SUFFIX
PLASTIC
CASE 648-08
16
1
2
3
4
5
6
7
8
A0
A1
A2
E1
E2
E3
O7
GND
1
D SUFFIX
SOIC
CASE 751B-03
16
1
ORDERING INFORMATION
LOGIC DIAGRAM
A2
3
A1
E1 E2 E3
A0
2
1
4
5
VCC = PIN 16
GND = PIN 8
= PIN NUMBERS
6
MC54FXXXJ
MC74FXXXN
MC74FXXXD
Ceramic
Plastic
SOIC
LOGIC SYMBOL
1 2 3
456
1 2 3
A0 A1 A2
O0 O1 O2 O3 O4 O5 O6 O7
9
7
O7
10
O6
12
11
O5
O4
13
O3
O2
15 14 13 12 11 10 9 7
15
14
O1
VCC = PIN 16
GND = PIN 8
O0
FAST AND LS TTL DATA
4-53
MC54/74F138
GUARANTEED OPERATING RANGES
Symbol
Parameter
VCC
Supply Voltage
TA
Operating Ambient Temperature Range
Min
Typ
Max
Unit
54, 74
4.5
5.0
5.5
V
54
–55
25
125
°C
74
0
25
70
IOH
Output Current — High
54, 74
–1.0
mA
IOL
Output Current — Low
54, 74
20
mA
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
Parameter
VIH
Input HIGH Voltage
VIL
Input LOW Voltage
VIK
Input Clamp Diode Voltage
VOH
Output HIGH Voltage
VOL
Output LOW Voltage
IIH
Input HIGH Current
Min
Typ
Max
Unit
2.0
54, 74
2.5
74
2.7
Guaranteed Input HIGH Voltage
0.8
V
Guaranteed Input LOW Voltage
–1.2
V
VCC = MIN, IIN = –18 mA
V
IOH = –1.0 mA
VCC = 4.50 V
V
IOH = –1.0 mA
VCC = 4.75 V
V
IOL = 20 mA
VCC = MIN
0.5
IIL
Input LOW Current
IOS
Output Short Circuit Current (Note 2)
ICC
Power Supply Current
–60
Test Conditions
V
20
µA
VCC = MAX, VIN = 2.7 V
0.1
mA
VCC = MAX, VIN = 7.0 V
–0.6
mA
VCC = MAX, VIN = 0.5 V
–150
mA
VCC = MAX, VOUT = 0 V
20
mA
VCC = MAX
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable device type.
2. Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS
Symbol
Parameter
tPLH
Propagation Delay,
tPHL
Address to Output
tPLH
Enable to Output
tPHL
E1 or E2
tPLH
Enable to Output
tPHL
E3
54/74F
54F
74F
TA = +25 °C
TA = +25°C to +125°C
TA = 0°C to 70°C
Levels
VCC = +5.0 V
VCC = 5.0 V ±10%
VCC = 5.0 V ±10%
of
CL = 50 pF
CL = 50 pF
CL = 50 pF
Delay
Min
Max
Min
Max
Min
Max
Unit
3
3.0
7.5
3.0
12
3.0
8.5
ns
3.0
8.0
3.0
9.5
3.0
9.0
3.5
7.0
3.5
11
3.5
8.0
3.0
7.0
3.0
8.0
3.0
7.5
4.0
8.0
4.0
12.5
4.0
9.0
3.5
7.5
3.5
8.5
3.5
8.5
2
3
ns
ns
FUNCTIONAL DESCRIPTION
The decoder accepts three binary weighted inputs (AO, A1,
A2) and when enabled provides eight mutually exclusive
active LOW outputs (O0–O7). The F138 features three Enable
inputs, two active LOW (E1, E2) and one active HIGH (E3). All
outputs will be HIGH unless E1 and E2 are LOW and E3 is
HIGH. This multiple enable function allows easy parallel
expansion of the device to a 1-of-32 (5 lines to 32 lines)
decoder with just four F138s and one inverter.
The F138 can be used as an 8-output demultiplexer by
using one of the active LOW Enable inputs as the data input
and the other Enable inputs as strobes. The Enable inputs
which are not used must be permanently tied to their
appropriate active HIGH or active LOW states.
FAST AND LS TTL DATA
4-54
MC54/74F138
FUNCTION TABLE
Inputs
E1
H
X
X
L
L
L
L
L
L
L
L
E2
X
H
X
L
L
L
L
L
L
L
L
E3
X
X
L
H
H
H
H
H
H
H
H
Outputs
A0
A1
A2
O0
O1
O2
O3
O4
O5
O6
O7
X
X
X
L
H
L
H
L
H
L
H
X
X
X
L
L
H
H
L
L
H
H
X
X
X
L
L
L
L
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
A0
A1
A2
FO4
A3
A4
H
123
A0 A1 A2
E
123
A0 A1 A2
E
123
A0 A1 A2
E
123
A0 A1 A2
E
F138
F138
F138
F138
O0 O1 O2 O3 O4 O5 O6 O7
O0 O1 O2 O3 O4 O5 O6 O7
O0 O1 O2 O3 O4 O5 O6 O7
O0 O1 O2 O3 O4 O5 O6 O7
O31
O0
FAST AND LS TTL DATA
4-55