7490 查看數據表（PDF） - Fairchild Semiconductor

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产品描述 (功能)

生产厂家

7490

Decade and Binary Counters

Fairchild Semiconductor 

Absolute Maximum Ratings(Note 4)

Supply Voltage

Input Voltage

7V

5.5V

Operating Free Air Temperature Range 0°C to +70°C

Storage Temperature Range

-65°C to +150°C

Recommended Operating Conditions

Symbol

Parameter

Min

Nom

Max

Units

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 5)

B

4.75

5

5.25

V

2

V

0.8

V

−0.8

mA

16

mA

0

32

MHz

0

16

tW

Pulse Width

A

(Note 5)

B

15

30

ns

Reset

15

tREL

Reset Release Time (Note 5)

25

ns

TA

Free Air Operating Temperature

0

70

°C

Note 4: 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 “Recom-

mended Operating Conditions” table will define the conditions for actual device operation.

Note 5: TA = 25°C and VCC = 5V.

DC Electrical Characteristics

over recommended operating free air temperature range (unless otherwise noted)

Symbol Parameter

Conditions

Min

Typ

Max

Units

(Note 6)

VI

Input Clamp Voltage

VOH

High Level Output

Voltage

VOL

Low Level Output

Voltage

II

Input Current @ Max

Input Voltage

VCC = Min, II = −12 mA

VCC = Min, IOH = Max

VIL = Max, VIH = Min

VCC = Min, IOL = Max

VIH = Min, VIL = Max (Note 7)

VCC = Max, VI = 5.5V

−1.5

V

2.4

3.4

V

0.2

0.4

V

1

mA

IIH

High Level Input

Current

VCC = Max

VI = 2.7V

A

Reset

B

80

40

µA

120

IIL

Low Level Input

Current

VCC = Max

VI = 0.4V

A

Reset

B

−3.2

−1.6

mA

−4.8

IOS

Short Circuit

Output Current

VCC = Max

(Note 8)

DM54

-20

DM74

−18

-57

mA

−57

ICC

Supply Current

VCC = Max (Note 9)

29

42

mA

Note 6: All typicals are at VCC = 5V, TA = 25°C.

Note 7: 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 8: Not more than one output should be shorted at a time.

Note 9: ICC is measured with all outputs open, both RO inputs grounded following momentary connection to 4.5V, and all other inputs grounded.

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