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參數資料
| 型號： | 74HCT238 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 3-to-8 line decoder/demultiplexer(3-8線譯碼器/數字多路分解器) |
| 中文描述： | 3至8線路解碼器/分離器（3-8線譯碼器/數字多路分解器） |
| 文件頁數： | 2/7頁 |
| 文件大?。?/td> | 49K |
| 代理商： | 74HCT238 |
December 1990
2
Philips Semiconductors
Product specification
3-to-8 line decoder/demultiplexer
74HC/HCT238
FEATURES
Demultiplexing capability
Multiple input enable for easy expansion
Ideal for memory chip select decoding
Active HIGH mutually exclusive outputs
Output capability: standard
I
CC
category: MSI
GENERAL DESCRIPTION
The 74HC/HCT238 are high-speed Si-gate CMOS devices
and are pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74HC/HCT238 decoders accept three binary
weighted address inputs (A
0
, A
1
, A
2
) and when enabled,
provide 8 mutually exclusive active HIGH outputs
(Y
0
to Y
7
).
The “238” features three enable inputs: two active LOW
(E
1
and E
2
) and one active HIGH (E
3
). Every output will be
LOW unless E
1
and E
2
are LOW and E
3
This multiple enable function allows easy parallel
expansion of the “238” to a 1-of-32 (5 lines to 32 lines)
decoder with just four “238” ICs and one inverter.
The “238” can be used as an eight output demultiplexer by
using one of the active LOW enable inputs as the data
input and the remaining enable inputs as strobes. Unused
enable inputs must be permanently tied to their
appropriate active HIGH or LOW state.
The “238” is identical to the “138” but has non-inverting
outputs.
QUICK REFERENCE DATA
GND = 0 V; T
amb
= 25
°
C; t
r
= t
f
= 6 ns
Notes
1.
C
PD
is used to determine the dynamic power dissipation (P
D
in
μ
W):
P
D
= C
PD
×
V
CC2
×
f
i
+ ∑
(C
L
×
V
CC2
×
f
o
) where:
f
i
= input frequency in MHz
f
o
= output frequency in MHz
∑
(C
L
×
V
CC2
×
f
o
) = sum of outputs
C
L
= output load capacitance in pF
V
CC
= supply voltage in V
For HC the condition is V
I
= GND to V
CC
For HCT the condition is V
I
= GND to V
CC
1.5 V
2.
ORDERING INFORMATION
See
“74HC/HCT/HCU/HCMOS Logic Package Information”
.
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
HC
HCT
t
PHL/
t
PLH
propagation delay
A
n
to Y
n
E
3
to Y
n
E
n
to Y
n
input capacitance
power dissipation capacitance per package
C
L
= 15 pF; V
CC
= 5 V
14
16
17
3.5
72
18
20
21
3.5
76
ns
ns
ns
pF
pF
C
I
C
PD
notes 1 and 2
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相關代理商/技術參數 |
參數描述 |
|---|---|
| 74HCT238BQ | 制造商:NXP Semiconductors 功能描述:Cut Tape 制造商:NXP Semiconductors 功能描述:IC 3-8 LINE DECODER/DEMUX 16 |
| 74HCT238BQ,115 | 功能描述:編碼器、解碼器、復用器和解復用器 5V 3-TO-8 DECDR/DMLT RoHS:否 制造商:Micrel 產品:Multiplexers 邏輯系列:CMOS 位數: 線路數量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| 74HCT238BQ-G | 功能描述:編碼器、解碼器、復用器和解復用器 5V 3-TO-8 DECDR/DMLT TTL RoHS:否 制造商:Micrel 產品:Multiplexers 邏輯系列:CMOS 位數: 線路數量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| 74HCT238BQ-Q100X | 制造商:NXP Semiconductors 功能描述:Decoder/Demultiplexer Single 3-to-8 16-Pin DHVQFN EP T/R 制造商:NXP Semiconductors 功能描述:74HCT238BQ-Q100/DHVQFN16/REEL7 - Tape and Reel 制造商:NXP Semiconductors 功能描述:IC DECODER/DEMUX 3-8 16DHVQFN |
| 74HCT238D | 功能描述:編碼器、解碼器、復用器和解復用器 3-TO-8 DECOD/DEMUX RoHS:否 制造商:Micrel 產品:Multiplexers 邏輯系列:CMOS 位數: 線路數量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
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