HD74HC149P-E [RENESAS]
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| 型号： | HD74HC149P-E |
| 厂家： | 
RENESAS TECHNOLOGY CORP |
| 描述： | 暂无描述 编码器 |
| 文件： | 总10页 (文件大小：169K) |
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Renesas Technology Home Pa.com
Renesas Technology Corp.
Customer Support Dept.
April 1, 2003
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HD74HC149
8-to-8-line Priority Encoder
ADE-205-448 (Z)
1st. Edition
Sep. 2000
Description
The HD74HC149 is priority encoder which has 8 input lines (0 - 7) and 8 output lies (Y0 - Y7).
It is the logical combination of a HD74HC148 8-3 line priority endriving a HD74HC138 3-8 line
decoder.
Only one request output can be low at a time. The output t on the highest priority
request that is low. The order of priority is 7 highest and
When E input is high, all outputs are high.
When a output (Y0 - Y7) is low, P output is loive condition.
Features
•
•
•
•
•
High Speed Operation: tpd (0 - L = 50 pF)
High Output Current: Fans
Wide Operating Volta
Low Input Current: 1
Low Quiescent Supply Cutatic) = 4 µA max (Ta = 25°C)
HD74HC149
Function Table
Inputs
Outputs
0
1
2
3
4
5
6
7
E
H
L
L
L
L
L
L
L
L
L
Y0
H
H
H
H
H
H
H
H
H
L
Y1 Y2
Y3
H
H
H
H
H
H
L
Y4 Y5
Y6
H
H
H
L
Y7
H
H
L
P
H
H
L
L
L
L
L
L
L
L
X
X
H
X
X
X
X
X
X
L
X
H
X
X
X
X
X
L
X
H
X
X
X
X
L
X
H
X
X
X
L
X
H
X
X
L
X
H
X
L
X
H
L
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
L
H
H
H
H
H
L
H
H
H
H
L
H
X
X
H
H
H
H
H
H
H
H
H
H
H
H
H
H
X
H
H
H
H
H
H
H
H
H
H
H
H
X
H
H
H
H
H
H
H
H
H
H
X
H
H
H
H
H
H
H
H
X
H
H
H
H
H
X
H
H
H
H
L
H
H
H :
High level
Low level
Irrelevant
L
:
:
X
Pin Arrangement
0
20 VCC
19 Y0
18 Y1
17 Y2
16 Y3
15 Y4
14 Y5
13 Y6
12 Y7
4
5
6
7
E
5
6
7
8
9
Inputs
Outputs
GND 10
11
P
(Top view)
2
HD74HC149
Logic Diagram
7
6
Y7
Y6
Y5
Y4
5
4
3
2
Y3
Y2
Y1
1
0
Y0
P
E
3
HD74HC149
DC Characteristics
Ta = –40 to
Ta = 25°C
+85°C
Item
Symbol VCC (V) Min Typ Max Min Max Unit Test Conditions
Input voltage
VIH
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
4.5
6.0
2.0
4.5
6.0
4.5
6.0
6.0
6
1.5
—
—
—
—
0.5
1.5
3.15
4.2
—
—
V
V
V
3.15 —
—
4.2
—
—
—
—
—
—
—
—
VIL
0.5
1.35
1.8
—
1.35 —
1.8
—
—
—
—
—
—
Output voltage
VOH
1.9 2.0
4.4 4.5
5.9 6.0
4.18 —
5.68 —
1.9
4.4
5.9
4.13
5.63
Vin = VIH or VIL IOH = –20 µA
—
—
—
IOH = –4 mA
IOH = –5.2 mA
VOL
—
—
—
—
0.0 0.1
0.0 0.
0.0
0.33
n = VIH or VIL IOL = 20 µA
IOL = 4 mA
IOL = 5.2 mA
Input current
Iin
±1.0 µA
40 µA
Vin = VCC or GND
Quiescent supply ICC
current
—
Vin = VCC or GND, Iout = 0 µA
4
HD74HC149
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Ta = –40 to
+85°C
Ta = 25°C
Symbol VCC (V) Min Typ Max Min Max Unit Test Conditions
Item
Propagation delay tPLH
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
—
—
—
—
—
—
—
—
—
—
—
—
140 —
175 ns
0 - 7 to Y, P
time
tPHL
16 28
—
—
35
—
—
24
30
tPLH
tPHL
155 —
195 ns
E to Y, P
13 31
—
—
—
—
—
—
39
33
—
—
5
26
75
15
13
10
Output rise/fall
time
tTLH
tTHL
95
19
16
10
ns
—
5
Input capacitance Cin
5
HD74HC149
Package Dimensions
Unit: mm
24.50
25.40 Max
20
11
10
1
1.30
0.89
7.62
1.27 Max
2.54 ± 0.25
0.48 ± 0.10
DP-20N
—
Conforms
1.26 g
nce value)
Unit: mm
1
20
1
10
+ 0.20
7.80
– 0.30
0.80 Max
1.15
0° – 8°
1.27
0.70 ± 0.20
*0.42 ± 0.08
0.40 ± 0.06
0.15
M
0.12
Hitachi Code
JEDEC
FP-20DA
—
EIAJ
Conforms
0.31 g
*Dimension including the plating thickness
Base material dimension
Mass (reference value)
6
HD74HC149
Unit: mm
12.8
13.2 Max
11
10
20
1
+ 0.25
– 0.40
10.40
0.935 Max
1.45
0° – 8°
+ 0.57
– 0.30
1.27
0.70
*0.42 ± 0.08
0.40 ± 0.06
0.15
M
0.12
P-20DB
Conforms
—
*Dimension including the plating thickness
Base material dimension
ue)
0.52 g
7
HD74HC149
Cautions
1. Hitachi neither warrants nor grants licenses of any rights of Hitachi’s or any third party’s patent,
copyright, trademark, or other intellectual property rights for information contained in this document.
Hitachi bears no responsibility for problems that may arise with third party’s rights, including
intellectual property rights, in connection with use of the information contained in this document.
2. Products and product specifications may be subject to change without notice. Confirm that you have
received the latest product standards or specifications before final design, purchase or use.
3. Hitachi makes every attempt to ensure that its products are of high quality and reliability. However,
contact Hitachi’s sales office before using the product in an application that demands especially high
quality and reliability or where its failure or malfunction may directly threaten human life or cause risk
of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation,
traffic, safety equipment or medical equipment for life support.
4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly
for maximum rating, operating supply voltage range, heat radiatioracteristics, installation
conditions and other characteristics. Hitachi bears no responsilure or damage when used
beyond the guaranteed ranges. Even within the guaranteed ormally foreseeable
failure rates or failure modes in semiconductor devices aeasures such as fail-
safes, so that the equipment incorporating Hitachi prdily injury, fire or other
consequential damage due to operation of the Hita
5. This product is not designed to be radiation re
6. No one is permitted to reproduce or duplichole or part of this document without
written approval from Hitachi.
7. Contact Hitachi’s sales office for athis document or Hitachi semiconductor
products.
Hitachi, Ltd.
Semiconductor & Integrated Circuits.
Nippon Bldg., 2-6-2, Ohte-machi, Chiyoo 100-0004, Japan
Tel: Tokyo (03) 3270-2111 Fax: (03) 3270
URL
NorthAmerica
Europe
Asia
: http://semiconductor.hitachi.com/
: http://www.hitachi-eu.com/hel/ecg
: http://sicapac.hitachi-asia.com
Japan
: http://www.hitachi.co.jp/Sicd/indx.htm
For further information write to:
Hitachi Semiconductor
(America) Inc.
179 East Tasman Drive, Dornacher Straβe 3
Hitachi Europe GmbH
Electronic Components Group
Hitachi Asia Ltd.
Hitachi Tower
16 Collyer Quay #20-00,
Singapore 049318
Hitachi Asia (Hong Kong) Ltd.
Group III (Electronic Components)
7/F., North Tower,
San Jose,CA 95134
D-85622 Feldkirchen, Munich
World Finance Centre,
Tel: <1> (408) 433-1990 Germany
Fax: <1>(408) 433-0223 Tel: <49> (89) 9 9180-0
Fax: <49> (89) 9 29 30 00
Tel : <65>-538-6533/538-8577
Fax : <65>-538-6933/538-3877
URL : http://www.hitachi.com.sg
Harbour City, Canton Road
Tsim Sha Tsui, Kowloon,
Hong Kong
Tel : <852>-(2)-735-9218
Fax : <852>-(2)-730-0281
URL : http://www.hitachi.com.hk
Hitachi Europe Ltd.
Electronic Components Group.
Whitebrook Park
Lower Cookham Road
Maidenhead
Hitachi Asia Ltd.
(Taipei Branch Office)
4/F, No. 167, Tun Hwa North Road,
Hung-Kuo Building,
Taipei (105), Taiwan
Berkshire SL6 8YA, United Kingdom
Tel: <44> (1628) 585000
Fax: <44> (1628) 585160
Tel : <886>-(2)-2718-3666
Fax : <886>-(2)-2718-8180
Telex : 23222 HAS-TP
URL : http://www.hitachi.com.tw
Copyright Hitachi, Ltd., 2000. All rights reserved. Printed in Japan.
Colophon 2.0
8
相关型号：
HD74HC149RPEL
HC SERIES, 8-BIT ENCODER, PDSO20, 12.80 X 7.50 MM, 1.27 MM PITCH, PLASTIC, SOP-20
RENESAS
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