RENESAS HD74HC490

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Regarding the change of names mentioned in the document, such as Hitachi
Electric and Hitachi XX, to Renesas Technology Corp.
The semiconductor operations of Mitsubishi Electric and Hitachi were transferred to Renesas
Technology Corporation on April 1st 2003. These operations include microcomputer, logic, analog
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these changes do not constitute any alteration to the contents of the document itself.
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Renesas Technology Corp.
Customer Support Dept.
April 1, 2003
Cautions
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Remember to give due consideration to safety when making your circuit designs, with appropriate
measures such as (i) placement of substitutive, auxiliary circuits, (ii) use of nonflammable material or
(iii) prevention against any malfunction or mishap.
Notes regarding these materials
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contained therein.
HD74HC490
Dual 4-bit Decade Counters
ADE-205-507 (Z)
1st. Edition
Sep. 2000
Description
This circuit contains eight master-slave flip-flops and additional gating to implement two individual 4-bit
decade counters. Each decade counter has individual clock, clear and set-to-9 inputs. BCD count
sequences of any length up to divide-by-100 may be implemented with a single HD74HC490. Buffering
on each output is provided to ensure that suceptibility to collector communication is reduced significantly.
The counters have paralle outputs from each counter state so that submultiples of the input count frequency
are available for system timing signals.
Features
•
•
•
•
•
High Speed Operation: tpd (Clock to QA) = 13 ns typ (CL = 50 pF)
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)
Function Table
Clear/Set-To-9
Inputs
Outputs
Clear
Set-To-9
QA
QB
QC
QD
H
L
L
L
L
L
L
H
H
L
L
H
L
L
Count
HD74HC490
BCD Count Sequence
Outputs
Count
QD
QC
QB
QA
0
L
L
L
L
1
L
L
L
H
2
L
L
H
L
3
L
L
H
H
4
L
H
L
L
5
L
H
L
H
6
L
H
H
L
7
L
H
H
H
8
H
L
L
L
9
H
L
L
H
1Clock
1
16 VCC
1Clear
2
15 2Clock
1QA
Output
3
1 Setto-9
4
CLR
QA
14 2Clear
CLR
QA
5
QB
1QC
6
QC
2QA
Output
12
2 Setto-9
1QD
7
QD
GND
8
QB
11 2QB
QC
10 2QC
QD
9
2QD
Outputs
Set-to-9
CK
(Top view)
2
13
CK
1QB
Set-to-9
Outputs
Pin Arrangement
HD74HC490
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
—
3
HD74HC490
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Ta = –40 to
+85°C
Ta = 25°C
Item
Symbol
VCC (V) Min Typ Max Min
Max
Unit
Maximum clock
f max
2.0
—
—
4
—
3
MHz
4.5
—
—
20
—
16
6.0
—
—
24
—
19
Propagation delay t PLH
2.0
—
—
120 —
150
time
4.5
—
13
24
—
30
6.0
—
—
20
—
26
t PLH
2.0
—
—
205 —
255
t PHL
4.5
—
21
41
—
51
6.0
—
—
35
—
43
t PLH
2.0
—
—
280 —
350
t PHL
4.5
—
23
56
—
70
6.0
—
—
48
—
60
2.0
—
—
205 —
255
4.5
—
18
41
—
51
6.0
—
—
35
—
43
2.0
—
—
205 —
255
4.5
—
13
41
—
51
6.0
—
—
35
—
43
2.0
—
—
190 —
240
4.5
—
17
38
—
48
6.0
—
—
32
—
41
2.0
80
—
—
100
—
4.5
16
6
—
20
—
6.0
14
—
—
17
—
2.0
100 —
—
125
—
4.5
20
1
—
25
—
6.0
17
—
—
21
—
frequency
t PHL
t PHL
t PLH
t PHL
Pulse width
Setup time
tw
t su
Output rise/fall
t TLH
2.0
—
—
75
—
95
time
t THL
4.5
—
5
15
—
19
6.0
—
—
13
—
16
—
—
5
10
—
10
Input capacitance
4
Cin
Test Conditions
ns
Clock to QA
ns
Clock to QB QC
ns
Clock to QC
ns
Clear to any output
ns
Set-to-9 to Q A, QD
ns
Set-to-9 to Q B, QC
ns
ns
ns
pF
HD74HC490
Package Dimensions
Unit: mm
19.20
20.00 Max
6.30
9
1
7.40 Max
16
8
1.3
0.48 ± 0.10
7.62
2.54 Min 5.06 Max
2.54 ± 0.25
0.51 Min
1.11 Max
+ 0.13
0.25 – 0.05
0° – 15°
Hitachi Code
JEDEC
EIAJ
Mass (reference value)
DP-16
Conforms
Conforms
1.07 g
Unit: mm
10.06
10.5 Max
9
1
8
1.27
*0.42 ± 0.08
0.40 ± 0.06
0.10 ± 0.10
0.80 Max
*0.22 ± 0.05
0.20 ± 0.04
2.20 Max
5.5
16
0.20
7.80 +– 0.30
1.15
0° – 8°
0.70 ± 0.20
0.15
0.12 M
*Dimension including the plating thickness
Base material dimension
Hitachi Code
JEDEC
EIAJ
Mass (reference value)
FP-16DA
—
Conforms
0.24 g
5
HD74HC490
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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Copyright  Hitachi, Ltd., 2000. All rights reserved. Printed in Japan.
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