HITACHI HD74HC678

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
P3 P2 P1 P0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 Output Y
H
L
L
L
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
L
L
L
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
L
L
H
L
L
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
L
L
H
H
L
L
L
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
L
H
L
L
L
L
L
L
H
H
H
H
H
H
H
H
H
H
H
H
L
H
L
H
L
H
L
L
L
L
L
H
H
H
H
H
H
H
H
H
H
H
L
H
L
H
H
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
H
H
L
H
L
H
H
H
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
H
L
H
H
L
L
L
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
L
H
H
L
L
H
L
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
L
H
H
L
H
L
L
L
L
L
L
L
L
L
L
L
H
H
H
H
H
H
L
H
H
L
H
H
L
L
L
L
L
L
L
L
L
L
L
H
H
H
H
H
L
H
H
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
H
H
H
L
H
H
H
L
H
L
L
L
L
L
L
L
L
L
L
L
L
L
H
H
H
L
H
H
H
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
H
L
H
H
H
H
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
L
H
All other combinations
H
L
Any combination
Latched
2
HD74HC678
Pin Arrangement
A1
1
24 VCC
A2
2
23 C
A3
3
22 Y
A4
4
21 P3
A5
5
20 P2
A6
6
19 P1
A7
7
18 P0
A8
8
17 A16
A9
9
16 A15
A10 10
15 A14
A11 11
14 A13
GND 12
13 A12
(Top view)
3
HD74HC678
Logic Diagram
C
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
CK
A12
IN
A13
A14
A15
A16
P0
P1
P2
P3
4
Q
Y
HD74HC678
DC Characteristics
Ta = –40 to
+85°C
Ta = 25°C
Item
Symbol
VCC (V) Min Typ Max Min
Max
Unit
Input voltage
VIH
2.0
1.5 —
—
1.5
—
V
4.5
3.15 —
—
3.15
—
6.0
4.2 —
—
4.2
—
2.0
—
—
0.5
—
0.5
4.5
—
—
1.35 —
1.35
6.0
—
—
1.8
—
1.8
2.0
1.9 2.0 —
1.9
—
4.5
4.4 4.5 —
4.4
—
6.0
5.9 6.0 —
5.9
—
4.5
4.18 —
—
4.13
—
I OH = –4 mA
6.0
5.68 —
—
5.63
—
I OH = –5.2 mA
2.0
—
0.0 0.1
—
0.1
4.5
—
0.0 0.1
—
0.1
6.0
—
0.0 0.1
—
0.1
4.5
—
—
0.26 —
0.33
I OL = 4 mA
6.0
—
—
0.26 —
0.33
I OL = 5.2 mA
VIL
Output voltage
VOH
VOL
Test Conditions
V
V
V
Vin = VIH or VIL I OH = –20 µA
Vin = VIH or VIL I OL = 20 µA
Input current
Iin
6.0
—
—
±0.1 —
±1.0
µA
Vin = VCC or GND
Quiescent supply
current
I CC
6.0
—
—
4.0
40
µA
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
VCC (V) Min Typ Max Min
Max
Unit
Test Conditions
Propagation delay t PLH
2.0
—
—
330 —
410
ns
P to Y
time
4.5
—
30
66
—
82
6.0
—
—
56
—
70
t PLH
2.0
—
—
210 —
265
ns
A to Y
t PHL
4.5
—
21
42
—
53
6.0
—
—
36
—
45
t PLH
2.0
—
—
150 —
190
ns
C to Y
t PHL
4.5
—
13
30
—
38
6.0
—
—
26
—
33
2.0
100 —
—
125
—
ns
A to C
4.5
20
12
—
25
—
6.0
17
—
—
21
—
Item
Setup time
Symbol
t PHL
t su
Output rise/fall
t TLH
2.0
—
—
75
—
95
time
t THL
4.5
—
—
15
—
19
6.0
—
—
13
—
16
—
—
5
10
—
10
Input capacitance
6
Cin
ns
pF
Unit: mm
13
13.4
15.0 Max
24
31.6
32.5 Max
12
1.2
15.24
0.48 ± 0.10
0.51 Min
2.54 ± 0.25
5.70 Max
2.13 Max
2.54 Min
1
+ 0.11
0.25 – 0.05
0° – 15°
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
DP-24
Conforms
Conforms
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 failsafes, 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.
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