Page 1
HD74HC680
12-bit Address Comparator
Description
The HD74HC680 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 12 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 A12 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 HD74HC680 features a transparent latch and a latch enable input (C). When C is high, the device is in
the transparent mode. When C is low, the previous logical 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)
Page 2
HD74HC680
Function Table
Inputs
CP
H LL LLHHHHHHHHHHHH L
H LL LHL HHHHHHHHHHH L
H LL HLL L HHHHHHHHHH L
H LL HHLL LHHHHHHHHH L
HLHLLLLLLHHHHHHHH L
HLHLHLLLLLHHHHHHH L
HLHHLLLLLLLHHHHHH L
HLHHHLLLLLLLHHHHH L
HHLLLLLLLLLLLHHHH L
HHLLHLLLLLLLLLHHH L
HHLHLLLLLLLLLLLHH L
HHLHHLLLLLLLLLLLH L
HHHLLLLLLLLLLLLLL L
HHHLHXXXXXXXXXXXX H
HHHHLXXXXXXXXXXXX H
HHHHHLLLLLLLLLLLL L
H All other combinations H
L Any combination Latched
P2P1P0A1A2A3A4A5A6A7A8A9A10A11A
3
12
Output Y
2
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Pin Arrangement
HD74HC680
A
A
A
A
A
A
A
A
A
GND
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
20
19
18
17
16
15
14
13
12
11
V
CC
C
Y
P
3
P
2
P
1
P
0
A
12
A
11
A
10
(Top view)
3
Page 4
HD74HC680
Logic Diagram
A
1
A
2
A
3
A
4
A
5
A
6
A
7
A
8
A
9
A
10
A
11
IN
Y
Q
CK
A
12
P
0
P
1
P
2
P
3
C
4
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HD74HC680
DC Characteristics
Ta = –40 to
Ta = 25°C
Item Symbol V
Input voltage V
IH
(V) Min Typ Max Min Max Unit Test Conditions
CC
2.0 1.5 — — 1.5 — V
4.5 3.15 — — 3.15 —
6.0 4.2 — — 4.2 —
V
IL
2.0 — — 0.5 — 0.5 V
4.5 — — 1.35 — 1.35
6.0 — — 1.8 — 1.8
Output voltage V
OH
2.0 1.9 2.0 — 1.9 — V Vin = VIH or VILIOH = –20 µA
4.5 4.4 4.5 — 4.4 —
6.0 5.9 6.0 — 5.9 —
4.5 4.18 — — 4.13 — IOH = –4 mA
6.0 5.68 — — 5.63 — IOH = –5.2 mA
V
OL
2.0 — 0.0 0.1 — 0.1 V Vin = VIH or VILIOL = 20 µA
4.5 — 0.0 0.1 — 0.1
6.0 — 0.0 0.1 — 0.1
4.5 — — 0.26 — 0.33 IOL = 4 mA
6.0 — — 0.26 — 0.33 IOL = 5.2 mA
Input current Iin 6.0 — — ±0.1 — ±1.0 µA Vin = VCC or GND
Quiescent supply
I
CC
6.0 — — 4.0 — 40 µA Vin = VCC or GND, Iout = 0 µA
current
+85°C
5
Page 6
HD74HC680
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Ta = –40 to
Ta = 25°C
Item Symbol V
Propagation delay t
time t
PLH
PHL
(V) Min Typ Max Min Max Unit Test Conditions
CC
2.0 — — 330 — 410 ns P to Y
4.5 — 26 66 — 82
6.0 — — 56 — 70
t
PLH
t
PHL
2.0 — — 210 — 265 ns A to Y
4.5 — 19 42 — 53
6.0 — — 36 — 45
t
PLH
t
PHL
2.0 — — 150 — 190 ns C to Y
4.5 — 18 30 — 38
6.0 — — 26 — 33
Output rise/fall t
time t
TLH
THL
2.0 — — 75 — 95 ns
4.5 — 6 15 — 19
6.0 — — 13 — 16
Input capacitance Cin — — 5 10 — 10 pF
+85°C
6
Page 7
24.50
25.40 Max
Unit: mm
1120
6.30
1
0.89
1.27 Max
2.54 ± 0.25
1.30
10
0.48 ± 0.10
7.00 Max
0.51 Min
2.54 Min 5.08 Max
Hitachi Code
JEDEC
EIAJ
Weight
7.62
+ 0.11
0.25
– 0.05
0° – 15°
(reference value)
DP-20N
—
Conforms
1.26 g
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20
Unit: mm
12.6
13 Max
11
5.5
1
0.80 Max
1.27
*0.42 ± 0.08
0.40 ± 0.06
*Dimension including the plating thickness
Base material dimension
10
0.12
0.10 ± 0.10
0.15
M
2.20 Max
7.80
0.20 ± 0.04
*0.22 ± 0.05
0.70 ± 0.20
Hitachi Code
JEDEC
EIAJ
Weight
(reference value)
+ 0.20
– 0.30
1.15
0° – 8°
FP-20DA
—
Conforms
0.31 g
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20
Unit: mm
12.8
13.2 Max
11
7.50
1
0.935 Max
1.27
*0.42 ± 0.08
0.40 ± 0.06
*Dimension including the plating thickness
Base material dimension
10
0.12
0.20 ± 0.10
0.15
M
2.65 Max
10.40
0.25 ± 0.04
*0.27 ± 0.05
0.70
Hitachi Code
JEDEC
EIAJ
Weight
(reference value)
+ 0.25
– 0.40
1.45
+ 0.57
– 0.30
0° – 8°
FP-20DB
Conforms
—
0.52 g
Page 10
Cautions
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copyright, trademark, or other intellectual property rights for information contained in this document.
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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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