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MC54/74F139 DUAL 1-OF-4 DECODER
The MC54/74F139 is a high speed Dual 1-of-4 Decoder/Demultiplexer. The device has two independent decoders, each accepting two inputs and providing four mutually exclusive active LOW outputs. Each decoder has an active LOW Enable input which can be used as a data input for a 4-output demultiplexer. Each half of the F139 can be used as a function generator providing all four miniterms of two variables.
DUAL 1-OF-4 DECODER
FASTTM SHOTTKY TTL
* * * *
Multifunction Capability Two Completely Independent 1-of-4 Decoders Active Low Mutually Exclusive Outputs Input Clamp Diodes Limit High-Speed Termination Effects
CONNECTION DIAGRAM
VCC 16 Eb 15 A0b 14 A1b 13 O0b 12 O1b 11 O2b 10 O3b 9
J SUFFIX CERAMIC CASE 620-09
16 1
16 1
N SUFFIX PLASTIC CASE 648-08
1 Ea
2 A0a
3 A1a
4 O0a
5 O1a
6 O2a
7 O3a
8 GND
16 1
D SUFFIX SOIC CASE 751B-03
ORDERING INFORMATION LOGIC DIAGRAM
Ea
1 2
A0a A1a
3
Eb
15
A0b A1b
14 13
MC54FXXXJ MC74FXXXN MC74FXXXD
Ceramic Plastic SOIC
LOGIC SYMBOL
1 23 15 14 13
E
A0 A1
E
A0 A1
O0 O1 O2 O3
O0 O1 O2 O3
4
5
6
7
12
11
10
9
4567 O3b
12 11 10 9
O0a
O1a
O2a
O3a
O0b
O1b
O2b
VCC = Pin 16 GND = Pin 8
VCC = PIN 16 GND = PIN 8 = PIN NUMBERS
FAST AND LS TTL DATA 4-56
MC54/74F139
GUARANTEED OPERATING RANGES
Symbol VCC TA IOH IOL Supply Voltage Operating Ambient Temperature Range Parameter 54, 74 54 74 Output Current -- High Output Current -- Low 54, 74 54, 74 Min 4.5 -55 0 Typ 5.0 25 25 Max 5.5 125 70 -1.0 20 mA mA Unit V C
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits Symbol VIH VIL VIK VOH VOL IIH IIL IOS ICC Parameter Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Voltage Output LOW Voltage Input HIGH Current 54, 74 74 2.5 2.7 0.5 20 0.1 Input LOW Current Output Short Circuit Current (Note 2) Power Supply Current -60 -0.6 -150 20 Min 2.0 0.8 -1.2 Typ Max Unit V V V V V V A mA mA mA mA Test Conditions Guaranteed Input HIGH Voltage Guaranteed Input LOW Voltage VCC = MIN, IIN = -18 mA IOH = -1.0 mA IOH = -1.0 mA IOL = 20 mA VCC = 4.50 V VCC = 4.75 V VCC = MIN
VCC = MAX, VIN = 2.7 V VCC = MAX, VIN = 7.0 V VCC = MAX, VIN = 0.5 V VCC = MAX, VOUT = 0 V VCC = MAX
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
54/74F TA = +25C VCC = +5.0 V CL = 50 pF Symbol tPLH tPHL tPLH tPHL Parameter Propagation Delay, Address to Output Enable to Output Min 3.5 3.5 3.5 2.5 Max 7.0 8.0 7.0 6.5 54F TA = -55C to +125C VCC = 5.0 V 10% CL = 50 pF Min 2.5 3.5 3.0 2.5 Max 12.0 9.5 9.0 8.0 74F TA = 0C to 70C VCC = 5.0 V 10% CL = 50 pF Min 3.0 3.5 3.5 2.5 Max 8.5 9.0 8.0 7.5 ns Unit ns
FUNCTIONAL DESCRIPTION The F139 is a high speed dual 1-of-4 decoder/demultiplexer fabricated with the Schottky barrier diode process. The device has two independent decoders, each of which accepts two binary weighted inputs (AO, A1) and provide four mutually exclusive active LOW outputs (O0-O3). Each decoder has an active LOW Enable (E). When E is HIGH all outputs are forced HIGH. The enable can be used as the data input for a 4-output demultiplexer application. Each half of the F139 generates all four miniterms of two variables. These four miniterms are useful in some applications, replacing multiple gate functions as shown in Figure 1, and thereby reducing the number of packages required in a logic network.
FAST AND LS TTL DATA 4-57
MC54/74F139
FUNCTION TABLE
Inputs E H L L L L A0 X L H L H A1 X L L H H O0 H L H H H O1 H H L H H Outputs O2 H H H L H O3 H H H H L
H = HIGH Voltage Level L = LOW Voltage Level X = Don't Care
E A0 A1 E A0 A1 E A0 A1 E A0 A1
O0
O1
E A0 A1 E A0 A1 E A0 A1 E A0 A1
O0
O1
O2
O2
O3
O3
Figure 1.
FAST AND LS TTL DATA 4-58

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