參數(shù)資料
型號(hào): 74HCT238D,652
廠商: NXP Semiconductors
文件頁(yè)數(shù): 17/18頁(yè)
文件大小: 0K
描述: IC 3-8 LINE DECODER/DEMUX 16SOIC
產(chǎn)品培訓(xùn)模塊: Logic Packages
標(biāo)準(zhǔn)包裝: 50
系列: 74HCT
類型: 解碼器/多路分解器
電路: 1 x 3:8
獨(dú)立電路: 1
輸出電流高,低: 4mA,4mA
電壓電源: 單電源
電源電壓: 4.5 V ~ 5.5 V
工作溫度: -40°C ~ 125°C
安裝類型: 表面貼裝
封裝/外殼: 16-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 16-SO
包裝: 管件
產(chǎn)品目錄頁(yè)面: 836 (CN2011-ZH PDF)
其它名稱: 568-2804-5
933715120652
74HC_HCT238_3
NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 03 — 16 July 2007
8 of 18
NXP Semiconductors
74HC238; 74HCT238
3-to-8 line decoder/demultiplexer
[1]
tpd is the same as tPHL and tPLH.
[2]
tt is the same as tTHL and tTLH.
[3]
CPD is used to determine the dynamic power dissipation (PD in W):
PD =CPD × VCC2 × fi × N+ ∑ (CL × VCC2 × fo) where:
fi = input frequency in MHz;
fo = output frequency in MHz;
CL = output load capacitance in pF;
VCC = supply voltage in V;
N = number of inputs switching;
∑ (C
L × VCC
2
× f
o) = sum of outputs.
11. Waveforms
74HCT238
tpd
propagation delay
An to Yn; see Figure 6
VCC = 4.5 V
-
19
35
44
53
ns
VCC = 5.0 V; CL =15pF
-
18
-
ns
E3 to Yn; see Figure 6
VCC = 4.5 V
-
20
37
46
56
ns
VCC = 5.0 V; CL =15pF
-
20
-
ns
En to Yn or see Figure 7
VCC = 4.5 V
-
20
35
44
53
ns
VCC = 5.0 V; CL =15pF
-
21
-
ns
tt
transition time
VCC = 4.5 V;
-
7
15
19
22
ns
CPD
power dissipation
capacitance
per package;
VI = GND to VCC 1.5 V
-76-
-
pF
Table 7.
Dynamic characteristics
GND = 0 V; test circuit see Figure 8.
Symbol Parameter
Conditions
25
°C
40 °C to +125 °C
Min
Typ
Max
(85
°C)
Max
(125
°C)
Unit
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Fig 6.
Input (An, E3) to output (Yn) propagation delays and output transition times
001aag757
An, E3 input
Yn output
tTHL
tTLH
VM
VX
VY
tPHL
tPLH
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