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PDF 74HCT138 Data sheet ( Hoja de datos )
| Número de pieza | 74HCT138 | |
| Descripción | 3 TO 8 LINE DECODER DEMULTIPLEXER | |
| Fabricantes | Diodes | |
| Logotipo |  |
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74HCT138
3 TO 8 LINE DECODER DEMULTIPLEXER
Description
The 74HCT138 is a high speed CMOS device that is designed to be
pin compatable with 74LS low power Schottky types.
Pin Assignments
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 remaing 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 E1 and E2 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 4.5V to 5.5V
• Sinks or sources 8mA at VCC = 4.5V
• CMOS low power consumption
• Schmitt Trigger Action at All Inputs
• Inputs accept up to 6.0V
• 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
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
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
<1000ppm antimony compounds.
Click here for ordering information, located at the end of datasheet
74HCT138
Document number: DS35489 Rev. 3 - 2
1 of 10
www.diodes.com
June 2013
© Diodes Incorporated
1 page  
74HCT138
Electrical Characteristics (@TA = +25°C, unless otherwise specified.)
Symbol Parameter Test Conditions
TA = 25°C
Vcc
Min Typ Max
VIH
High-level
Input Voltage
4.5V to 5.5V 2.0 1.6
VIL
Low-level
input voltage
4.5V to 5.5V 1.2 0.8
High Level
VOH Output
Voltage
IOH = -20 μA
IOH = -4 mA
4.5V
4.5V
4.4 4.5
3.98 4.32
Low-level
VOL Output
Voltage
IOL = 20 μA
IOL = 4 mA
4.5V
4.5V
0 0.1
0.15 0.26
II
Input Current
VI =GND to
5.5 V
5.5V
±0.1
ICC
Supply
Current
VI = GND or VCC
IO=0
5.5V
Test Per PINS
Pin An
Additional
∆ICC Supply
Current
VI = PIN En
Vcc -2.1 V
4.5V to 5.5V
Other
VI = Vcc
or GND
PIN E3
IO=0
Ci
Input
Capacitance
Vi = VCC or GND
5.5V
8.0
150 540
125 450
100 360
4 10
-40°C to 85°C
Min Max
2.0
0.8
4.4
3.85
0.1
0.33
±1
80
675
563
450
10
-40°C to 125°C
Min Max
Unit
2.0 V
0.8 V
4.4
3.7 V
0.1
V
0.4
± 1 μA
160 μA
735
μA
613
490 μA
10 pF
Switching Characteristics
Symbol /
Parameter
tPLH,
tPLH
Propagation
Delay
tTLH,
tTHL
Transition
Time
Pins
Test
Conditions
An to Yn
Figure 2
E3 to Yn
Figure 2
En to Yn
Figure 2
Yn Figure 2
Vcc
4.5V
5.0V
4.5V
5.0V
4.5V
5.0V
4.5 V
TA=25°C
Min Typ. Max
20 35
17
18 40
19
19 40
19
-40°C to 85°C
Min Max
35
40
40
-40°C to 125°C
Min Max
45
45
45
Unit
ns
7 15 15 110 ns
74HCT138
Document number: DS35489 Rev. 3 - 2
5 of 10
www.diodes.com
June 2013
© Diodes Incorporated
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet 74HCT138.PDF ] | |
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