HD74HC678 [HITACHI]
16-bit Address Comparator; 16位地址比较
| 型号： | HD74HC678 |
| 厂家： | 
HITACHI SEMICONDUCTOR |
| 描述： | 16-bit Address Comparator |
| 文件： | 总8页 (文件大小：53K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
HD74HC678
16-bit Address Comparator
Description
The HD74HC678 address comparator simplifies addressing of memory boards and/or other peripheral
devices. The four P inputs are normally hard wired with a preprogrammed address. An internal decoder
determines what input information applied to the 16 A inputs must be low or high to cause a low state at the
output (Y). For example, a positive-logic bit combination of 0111 (decimal 7) at the P input determines
that inputs A1 through A7 must be low and that inputs A8 through A16 must be high to cause the output to go
low. Equality of the address applied at the A inputs to the preprogrammed address is indicated by the
output being low. The HD74HC678 features a transparent latch and a latch enabled input (C). When C is
high, the device is in the transparent mode. When C is low, the previous logic state of Y is latched.
Features
•
•
•
•
•
High Speed Operation
High Output Current: Fanout of 10 LSTTL Loads
Wide Operating Voltage: VCC = 2 to 6 V
Low Input Current: 1 µA max
Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
HD74HC678
Function Table
Inputs
C
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
P3 P2 P1 P0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 Output Y
L
L
L
L
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
H
H
L
L
L
L
L
L
L
L
L
L
L
L
L
H
H
H
H
L
L
L
L
L
L
L
L
L
L
L
L
H
H
H
H
H
L
L
L
L
L
L
L
L
L
L
L
H
H
H
H
H
H
L
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
L
L
L
H
L
L
L
L
H
H
L
L
L
L
H
L
L
L
H
H
H
H
L
L
L
L
H
L
L
L
H
H
L
L
L
H
L
L
L
H
H
H
H
H
H
H
H
L
L
L
L
L
H
L
L
L
L
L
L
H
H
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
H
H
H
H
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
L
H
H
L
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
L
L
All other combinations
Any combination
H
Latched
2
HD74HC678
Pin Arrangement
A1
A2
A3
A4
A5
A6
A7
A8
A9
1
2
3
4
5
6
7
8
9
24 VCC
23
22
C
Y
21 P3
20 P2
19 P1
18 P0
17 A16
16 A15
15 A14
14 A13
13 A12
A10 10
A11 11
GND 12
(Top view)
3
HD74HC678
Logic Diagram
C
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
CK
IN
Q
Y
A13
A14
A15
A16
P0
P1
P2
P3
4
HD74HC678
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
6.0
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 0.1
0.0 0.1
0.1
0.1
0.1
0.33
0.33
V
Vin = VIH or VIL IOL = 20 µA
—
—
—
—
—
—
0.26 —
0.26 —
±0.1 —
4.0
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
5
HD74HC678
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
2.0
4.5
6.0
2.0
4.5
6.0
—
—
—
—
—
—
—
—
—
—
—
330 —
410 ns
P to Y
A to Y
C to Y
A to C
time
tPHL
30 66
—
—
82
—
—
56
70
tPLH
tPHL
210 —
265 ns
21 42
—
—
53
—
—
36
45
tPLH
tPHL
150 —
190 ns
13 30
—
—
125
25
21
—
—
—
—
38
33
—
26
—
—
—
75
15
13
10
Setup time
tsu
100 —
20 12
—
—
—
95
19
16
10
ns
ns
pF
17
—
—
—
—
—
—
—
—
5
Output rise/fall
time
tTLH
tTHL
Input capacitance Cin
6
Unit: mm
31.6
32.5 Max
24
13
1
12
1.2
15.24
2.13 Max
+ 0.11
– 0.05
0.25
2.54 ± 0.25
0.48 ± 0.10
0° – 15°
Hitachi Code
DP-24
JEDEC
EIAJ
Conforms
Conforms
Weight (reference value) 3.1 g
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 radiation characteristics, installation
conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used
beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable
failure rates or failure modes in semiconductor devices and employ systemic measures such as fail-
safes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other
consequential damage due to operation of the Hitachi product.
5. This product is not designed to be radiation resistant.
6. No one is permitted to reproduce or duplicate, in any form, the whole or part of this document without
written approval from Hitachi.
7. Contact Hitachi’s sales office for any questions regarding this document or Hitachi semiconductor
products.
Hitachi, Ltd.
Semiconductor & Integrated Circuits.
Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan
Tel: Tokyo (03) 3270-2111 Fax: (03) 3270-5109
URL
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Japan
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For further information write to:
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(America) Inc.
Hitachi Europe GmbH
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Copyright ' Hitachi, Ltd., 1999. All rights reserved. Printed in Japan.
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