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PDF 74AHC138 Data sheet ( Hoja de datos )
| Número de pieza | 74AHC138 | |
| Descripción | 3-TO-8 LINE DECODER DEMULTIPLEXER | |
| Fabricantes | Diodes | |
| Logotipo |  |
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74AHC138
3-TO-8 LINE DECODER DEMULTIPLEXER
Description
Pin Assignments
The 74AHC138 is an advanced high speed CMOS device.
The device accepts a three bit binary weighted address on input
pins A0, A1 and A2 and when enabled will produce one active low
output with the remaining seven being high.
There are two active LOW enable inputs E1 and E2, and one active
HIGH enable input E3. The disabled device state results in all
outputs being high. The enable state occurs with E 1 and E 2
asserted low and E3 asserted high.
The multiple enable lines allow for the parallel expansion of
decoders to create 4-to-16 line versions with no additional parts and
5-to-32 versions with the addition of a single inverter.
Features
• Wide Supply Voltage Range from 2.0 V to 5.5 V
• Sinks or sources 8mA at Vcc = 4.5V
• CMOS low power consumption
• Schmitt Trigger Action at All Inputs
• Inputs accept up to 5.5 V
• ESD Protection Tested per JESD 22
Exceeds 200-V Machine Model (A115-A)
Exceeds 2000-V Human Body Model (A114-A)
Exceeds 1000-V Charged Device Model (C101C)
• Latch-Up Exceeds 250mA per JESD 78, Class II
• SO16 Available in “Green” Molding Compound
(no Br, Sb)
• Lead-Free Finish; RoHS Compliant (Notes 1 & 2)
Applications
• Memory chip select decoding
• Demultiplexing
• Single line peripheral control
• Allow simple serial bit streams from a microcontroller to control
as many peripheral lines as needed.
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl)
and < 1000 ppm antimony compounds.
Click for Ordering Information
74AHC138
Document number: DS35482 Rev. 2 - 2
1 of 10
www.diodes.com
June 2013
© Diodes Incorporated
1 page  
Electrical Characteristics (@TA = +25°C, unless otherwise specified.)
Symbol Parameter
Test Conditions Vcc
VIH
High-level Input
Voltage
2.0V
3.0V
5.5V
VIL
Low-level input
voltage
2.0V
3.0V
5.5V
IOH = -50 μA
2.0V
IOH = -50 μA
VOH
High Level
Output Voltage
IOH = -50 μA
IOH = -4 mA
IOH = -8 mA
3.0V
4.5V
3.0V
4.5V
IOL = 50 μA
2.0V
IOL = 50 μA
VOL
Low-level Output
Voltage
IOL = 50 μA
IOL = 4 mA
IOL = 8 mA
3.0V
4.5V
3.0V
4.5V
II Input Current
VI =GND or 5.5 V 5.5V
ICC
Supply Current
VI = GND or VCC
IO=0 A
5.5V
Ci
Input
Capacitance
Vi = VCC or GND 5.5V
TA = +25°C
Min Typ Max
1.5
2.1
3.85
0.5
0.9
1.65
1.9 2.0
2.9 3.0
4.4 4.5
2.58
3.94
0.1
0.1
0.1
0.36
0.36
0.1
4.0
4.0 10
-40°C to +85°C
Min Max
1.5
2.1
3.85
0.5
0.9
1.65
1.9
2.9
4.4
2.48
3.80
0.1
0.1
0.1
0.44
0.44
±1
40
10
74AHC138
-40°C to +125°C
Min Max
1.5
2.1
3.85
0.5
0.9
1.65
1.9
2.9
4.4
2.40
3.70
0.1
0.1
0.1
0.55
0.55
±2
80
10
Unit
V
V
V
V
μA
μA
pF
Switching Characteristics
Symbol Parameter
Propagation
Delay An to Yn
tPD
Propagation
Delay E3 to Yn
Propagation
Delay En to Yn
Test
Conditions
Figure 2
CL=15 pF
Figure 2
CL=50pF
Figure 2
CL=15 pF
Figure 2
CL=50pF
Figure 2
CL=15 pF
Figure 2
CL=50pF
Vcc
3.0 V to 3.6V
4.5 V to 5.5 V
3.0 V to 3.6V
4.5 V to 5.5 V
3.0 V to 3.6V
4.5 V to 5.5 V
3.0 V to 3.6V
4.5 V to 5.5 V
3.0 V to 3.6V
4.5 V to 5.5 V
3.0 V to 3.6V
4.5 V to 5.5 V
TA = +25°C
Min Typ. Max
0.5 4.4 8.0
0.5 3.0 5.5
0.5 6.2 11.5
0.5 4.3 7.5
0.5 4.7 8.0
0.5 3.3 5.1
0.5 6.8 11.5
0.5 4.7 7.1
0.5 6.7 9.7
0.5 4.8 6.8
0.5 9.6 13.2
0.5 6.8 8.8
-40°C to +85°C
Min Max
0.5 9.5
0.5 6.5
0.5 13.0
0.5 8.5
0.5 9.5
0.5 6.0
0.5 13.0
0.5 8.0
0.5 11.5
0.5 8.0
0.5 15.0
0.5 10.0
-40°C to +125°C
Unit
Min Max
0.5 11.5
0.5 7.0
ns
0.5 14.5
0.5 9.5
0.5 11.5
0.5 7.5
ns
0.5 14.5
0.5 9.0
0.5 12.5
0.5 8.5
ns
0.5 16.5
0.5 11.0
74AHC138
Document number: DS35482 Rev. 2 - 2
5 of 10
www.diodes.com
June 2013
© Diodes Incorporated
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet 74AHC138.PDF ] | |
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