ChipFind - документация

Электронный компонент: HD74HC490

Скачать:  PDF   ZIP
HD74HC490
Dual 4-bit Decade Counters
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: t
pd
(Clock to Q
A
) = 13 ns typ (C
L
= 50 pF)
High Output Current: Fanout of 10 LSTTL Loads
Wide Operating Voltage: V
CC
= 2 to 6 V
Low Input Current: 1 A max
Low Quiescent Supply Current: I
CC
(static) = 4 A max (Ta = 25C)
Function Table
Clear/Set-To-9
Inputs
Outputs
Clear
Set-To-9
Q
A
Q
B
Q
C
Q
D
H
L
L
L
L
L
L
H
H
L
L
H
L
L
Count
HD74HC490
2
BCD Count Sequence
Outputs
Count
Q
D
Q
C
Q
B
Q
A
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
Pin Arrangement
CLR
CLR
Q
A
Q
A
Q
B
Q
C
Q
D
Q
B
Q
C
Q
D
CK
CK
(Top view)
1
2
3
4
5
6
7
8
Set-to-9
Set-to-9
9
10
11
12
13
14
15
16
1 Set-
to-9
1Q
B
1Q
C
1Q
D
GND
1Clock
1Clear
1Q
A
Output
V
CC
2Clock
2 Set-
to-9
2Q
B
2Q
C
2Q
D
2Clear
2Q
A
Output
Outputs
Outputs
HD74HC490
3
DC Characteristics
Ta = 25
C
Ta = 40 to
+85
C
Item
Symbol
V
CC
(V) Min Typ Max Min
Max
Unit
Test Conditions
Input voltage
V
IH
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 = V
IH
or V
IL
I
OH
= 20
A
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
V
OL
2.0
--
0.0
0.1
--
0.1
V
Vin = V
IH
or V
IL
I
OL
= 20
A
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
Input current
Iin
6.0
--
--
0.1 --
1.0
A
Vin = V
CC
or GND
Quiescent supply
current
I
CC
6.0
--
--
4.0
--
40
A
Vin = V
CC
or GND, Iout = 0
A
HD74HC490
4
AC Characteristics (C
L
= 50 pF, Input t
r
= t
f
= 6 ns)
Ta = 25
C
Ta = 40 to
+85
C
Item
Symbol
V
CC
(V) Min Typ Max Min
Max
Unit
Test Conditions
Maximum clock
f
max
2.0
--
--
4
--
3
MHz
frequency
4.5
--
--
20
--
16
6.0
--
--
24
--
19
Propagation delay t
PLH
2.0
--
--
120 --
150
ns
Clock to Q
A
time
t
PHL
4.5
--
13
24
--
30
6.0
--
--
20
--
26
t
PLH
2.0
--
--
205 --
255
ns
Clock to Q
B
Q
C
t
PHL
4.5
--
21
41
--
51
6.0
--
--
35
--
43
t
PLH
2.0
--
--
280 --
350
ns
Clock to Q
C
t
PHL
4.5
--
23
56
--
70
6.0
--
--
48
--
60
t
PHL
2.0
--
--
205 --
255
ns
Clear to any output
4.5
--
18
41
--
51
6.0
--
--
35
--
43
t
PLH
2.0
--
--
205 --
255
ns
Set-to-9 to Q
A
, Q
D
4.5
--
13
41
--
51
6.0
--
--
35
--
43
t
PHL
2.0
--
--
190 --
240
ns
Set-to-9 to Q
B
, Q
C
4.5
--
17
38
--
48
6.0
--
--
32
--
41
Pulse width
t
w
2.0
80
--
--
100
--
ns
4.5
16
6
--
20
--
6.0
14
--
--
17
--
Setup time
t
su
2.0
100 --
--
125
--
ns
4.5
20
1
--
25
--
6.0
17
--
--
21
--
Output rise/fall
t
TLH
2.0
--
--
75
--
95
ns
time
t
THL
4.5
--
5
15
--
19
6.0
--
--
13
--
16
Input capacitance
Cin
--
--
5
10
--
10
pF
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
Copyright ' Hitachi, Ltd., 1999. All rights reserved. Printed in Japan.
Hitachi Asia Pte. Ltd.
16 Collyer Quay #20-00
Hitachi Tower
Singapore 049318
Tel: 535-2100
Fax: 535-1533
URL
NorthAmerica
: http:semiconductor.hitachi.com/
Europe
: http://www.hitachi-eu.com/hel/ecg
Asia (Singapore)
: http://www.has.hitachi.com.sg/grp3/sicd/index.htm
Asia (Taiwan)
: http://www.hitachi.com.tw/E/Product/SICD_Frame.htm
Asia (HongKong)
: http://www.hitachi.com.hk/eng/bo/grp3/index.htm
Japan
: http://www.hitachi.co.jp/Sicd/indx.htm
Hitachi Asia Ltd.
Taipei Branch Office
3F, Hung Kuo Building. No.167,
Tun-Hwa North Road, Taipei (105)
Tel: <886> (2) 2718-3666
Fax: <886> (2) 2718-8180
Hitachi Asia (Hong Kong) Ltd.
Group III (Electronic Components)
7/F., North Tower, World Finance Centre,
Harbour City, Canton Road, Tsim Sha Tsui,
Kowloon, Hong Kong
Tel: <852> (2) 735 9218
Fax: <852> (2) 730 0281
Telex: 40815 HITEC HX
Hitachi Europe Ltd.
Electronic Components Group.
Whitebrook Park
Lower Cookham Road
Maidenhead
Berkshire SL6 8YA, United Kingdom
Tel: <44> (1628) 585000
Fax: <44> (1628) 778322
Hitachi Europe GmbH
Electronic components Group
Dornacher Strae 3
D-85622 Feldkirchen, Munich
Germany
Tel: <49> (89) 9 9180-0
Fax: <49> (89) 9 29 30 00
Hitachi Semiconductor
(America) Inc.
179 East Tasman Drive,
San Jose,CA 95134
Tel: <1> (408) 433-1990
Fax: <1>(408) 433-0223
For further information write to: