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Fairchild Semiconductor
Fairchild Semiconductor

7490 Datasheet

Decade and Binary Counters


7490 Datasheet Preview


August 1986
Revised March 2000
DM7490A
Decade and Binary Counters
General Description
The DM7490A monolithic counter contains four master-
slave flip-flops and additional gating to provide a divide-by-
two counter and a three-stage binary counter for which the
count cycle length is divide-by-five.
The counter has a gated zero reset and also has gated set-
to-nine inputs for use in BCD nine’s complement applica-
tions.
To use the maximum count length (decade or four-bit
binary), the B input is connected to the QA output. The
input count pulses are applied to input A and the outputs
are as described in the appropriate Function Table. A sym-
metrical divide-by-ten count can be obtained from the
counters by connecting the QD output to the A input and
applying the input count to the B input which gives a divide-
by-ten square wave at output QA.
Features
s Typical power dissipation
145 mW
s Count frequency 42 MHz
Ordering Code:
Order Number Package Number
Package Description
DM7490AN
N14A
14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Connection Diagram
© 2000 Fairchild Semiconductor Corporation DS006533
www.fairchildsemi.com
Page 1

Function Tables
BCD Count Sequence (Note 1)
Count
0
1
2
3
4
5
6
7
8
9
QD
L
L
L
L
L
L
L
L
H
H
Outputs
QC QB
LL
LL
LH
LH
HL
HL
HH
HH
LL
LL
QA
L
H
L
H
L
H
L
H
L
H
Logic Diagram
Count
0
1
2
3
4
5
6
7
8
9
BCD Bi-Quinary (5-2) (Note 2)
Outputs
QA QD QC QB
LLLL
L L LH
LLHL
L LHH
LHL L
HL L L
HL LH
HLHL
H L HH
HHL L
Reset/Count Function Table
R0(1)
H
H
X
X
L
L
X
Reset Inputs
R0(2) R9(1)
HL
HX
XH
LX
XL
XX
LL
R9(2)
X
L
H
L
X
L
X
Outputs
QD QC QB QA
LLLL
LLLL
HL LH
COUNT
COUNT
COUNT
COUNT
H = HIGH Level
L = LOW Level
X = Don’t Care
Note 1: Output QA is connected to input B for BCD count.
Note 2: Output QD is connected to input A for bi-quinary count
The J and K inputs shown without connection are for reference only and
are functionally at a HIGH level.
www.fairchildsemi.com
2
Page 2

Absolute Maximum Ratings(Note 3)
Supply Voltage
7V
Input Voltage
5.5V
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range
65°C to +150°C
Note 3: The “Absolute Maximum Ratings” are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommended Operating Conditions” table will define the conditions
for actual device operation.
Recommended Operating Conditions
Symbol
Parameter
VCC Supply Voltage
VIH HIGH Level Input Voltage
VIL LOW Level Input Voltage
IOH HIGH Level Output Current
IOL LOW Level Output Current
fCLK Clock Frequency
A
(Note 4)
B
tW Pulse Width
(Note 4)
A
B
Reset
tREL Reset Release Time (Note 4)
TA Free Air Operating Temperature
Note 4: TA = 25°C and VCC = 5V.
Min
4.75
2
0
0
15
30
15
25
0
Nom
5
Max
5.25
0.8
0.8
16
32
16
70
Units
V
V
V
mA
mA
MHz
ns
ns
°C
DC Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Typ
Min Max
(Note 5)
Units
VI Input Clamp Voltage
VCC = Min, II = −12 mA
VOH HIGH Level
VCC = Min, IOH = Max
Output Voltage
VIL = Max, VIH = Min
VOL LOW Level
VCC = Min, IOL = Max
Output Voltage
VIH = Min, VIL = Max (Note 6)
II Input Current @ Max Input Voltage VCC = Max, VI = 5.5V
IIH HIGH Level
VCC = Max
A
Input Current
VI = 2.7V
Reset
B
1.5
V
2.4 3.4
V
0.2 0.4
V
1 mA
80
40 µA
120
IIL LOW Level
Input Current
VCC = Max
VI = 0.4V
A
Reset
B
3.2
1.6
4.8
mA
IOS Short Circuit Output Current
ICC Supply Current
Note 5: All typicals are at VCC = 5V, TA = 25°C.
VCC = Max (Note 7)
VCC = Max (Note 8)
18 57 mA
29 42 mA
Note 6: QA outputs are tested at IOL = Max plus the limit value of IIL for the B input. This permits driving the B input while maintaining full fan-out capability.
Note 7: Not more than one output should be shorted at a time.
Note 8: ICC is measured with all outputs open, both RO inputs grounded following momentary connection to 4.5V, and all other inputs grounded.
3 www.fairchildsemi.com
Page 3

AC Switching Characteristics
at VCC = 5V and TA = 25°C
Symbol
Parameter
fMAX
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPHL
Maximum Clock
Frequency
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
From (Input)
To (Output)
A to QA
B to QB
A to QA
A to QA
A to QD
A to QD
B to QB
B to QB
B to QC
B to QC
B to QD
B to QD
SET-9 to QA, QD
SET-9 to QB, QC
SET-0
Any Q
RL = 400, CL = 15 pF
Min Max
32
16
16
18
48
50
16
21
32
35
32
35
30
40
40
Units
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
www.fairchildsemi.com
4
Page 4
Part Number 7490
Manufactur Fairchild Semiconductor
Description Decade and Binary Counters
Total Page 5 Pages
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7490 datasheet
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