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74HC138 の電気的特性と機能

74HC138のメーカーはDiodesです、この部品の機能は「3 TO 8 LINE DECODER DEMULTIPLEXER」です。


製品の詳細 ( Datasheet PDF )

部品番号 74HC138
部品説明 3 TO 8 LINE DECODER DEMULTIPLEXER
メーカ Diodes
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74HC138 Datasheet, 74HC138 PDF,ピン配置, 機能
74HC138
3 TO 8 LINE DECODER DEMULTIPLEXER
Description
The 74HC138 is a 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 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.
Pin Assignments
Features
Wide Supply Voltage Range from 2.0V to 6.0V
Sinks or sources 8 mA 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 100mA per JESD 78D, 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
74HC138
Document number: DS35488 Rev.3 - 2
1 of 10
www.diodes.com
June 2013
© Diodes Incorporated

1 Page





74HC138 pdf, ピン配列
Logic Diagram
74HC138
74HC138
Document number: DS35488 Rev.3 - 2
3 of 10
www.diodes.com
June 2013
© Diodes Incorporated


3Pages


74HC138 電子部品, 半導体
Operating Characteristics (@TA = +25°C, unless otherwise specified.)
Parameter
Test
Conditions
VCC = 5V
Typ
Cpd
Power dissipation
capacitance
f = 1 MHz all outputs switching-no load
19
Unit
pF
Parameter Measurement Information
74HC138
Vcc
2.0V -6.0V
5.0V
Inputs
VI tr/tf
VCC 6 ns
VCC 6 ns
VM
VCC/2
VCC/2
CL
50pF
15pF used for 5V typical test
Voltage Waveform
Pulse Duration
Voltage Waveform
Propagation Delay Times
Inverting and Non Inverting Outputs
Notes:
A. Includes test lead and test apparatus capacitance.
B. All pulses are supplied at pulse repetition rate 10 MHz.
C. Inputs are measured separately one transition per measurement
D. tPLH and tPHL are the same as tPD
Figure 1 Load Circuit and Voltage Waveforms
74HC138
Document number: DS35488 Rev.3 - 2
6 of 10
www.diodes.com
June 2013
© Diodes Incorporated

6 Page



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