DM74LS645 查看數據表（PDF） - Fairchild Semiconductor

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DM74LS645

Octal Bus Transceiver

Fairchild Semiconductor 

Absolute Maximum Ratings(Note 1)

Supply Voltage

7V

Input Voltage

7V

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

Storage Temperature Range

−55°C to +150°C

Note 1: 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 (Note 2)

VIH

HIGH Level Input Voltage

VIL

LOW Level Input Voltage

IOH

HIGH Level Output Current

IOL

LOW Level Output Current

TA

Free Air Operating Temperature

Note 2: Voltage values are with respect to the network ground terminal.

Min

4.75

2

0

Nom

5

Max

5.25

0.6

−15

24

70

Units

V

V

V

mA

mA

°C

Electrical Characteristics

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

Symbol

Parameter

Conditions (Note 3)

Typ

Min

(Note 4)

VI

Input Clamp Voltage

HYS

Hysteresis (VT+ − V−)

A or B Input

VCC = Min, II = 18 mA

VCC = Min

0.2

0.4

VOH

VOL

IOZH

IOZL

II

IIH

IIL

IOS

ICC

HIGH Level Output Voltage

LOW Level Output Voltage

Off-State Output Current,

HIGH Level Voltage Applied

Off-State Output Current,

LOW Level Voltage Applied

Input Current at

Maximum Input Voltage

VCC = Min, VIH = 2V,

VIL = Max

VCC = Min, VIH = 2V,

VIL = Max

VCC = Max, G at 2V,

VO = 2.7V

VCC = Max, G at 2V

VO = 0.4V

VCC = Max

A or B

DIR or G

HIGH Level Input Current

VCC = Max, VIH = 2.7

LOW Level Input Current

VCC = Max, VIL = 0.4V

Short Circuit Output Current (Note 5) VCC = Max

Total Supply

Outputs HIGH

Current

Outputs LOW

IOH = −3 mA

IOH = Max

IOL = 12 mA

IOL = 24 mA

2.4

3.4

2

0.25

0.35

VI = 5.5V

VI = 7V

−40

VCC = Max,

48

Outputs Open

62

Outputs at Hi-Z

64

Note 3: For conditions shown as Min or Max, use the appropriate value specified under Recommended Operating Conditions.

Note 4: All typicals are at VCC = 5V, TA = 25°C.

Note 5: Not more than one output should be shorted at a time, and the duration should not exceed one second.

Max

−1.5

0.4

0.5

20

−400

0.1

0.1

20

−0.4

−225

70

90

95

Units

V

V

V

V

µA

µA

mA

µA

mA

mA

mA

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