SN54LS245 查看數據表（PDF） - Motorola => Freescale

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SN54LS245

Octal bus transceiver

Motorola => Freescale 

SN54 / 74LS245

DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)

Limits

Symbol

Parameter

Min Typ Max Unit

Test Conditions

VIH

Input HIGH Voltage

2.0

V

Guaranteed Input HIGH Voltage for

All Inputs

54

VIL

Input LOW Voltage

74

0.7

Guaranteed Input LOW Voltage for

0.8

V All Inputs

VT+–VT–

VIK

Hysteresis

Input Clamp Diode Voltage

VOH

Output HIGH Voltage

VOL

Output LOW Voltage

54, 74

54, 74

54, 74

74

0.2

0.4

– 0.65 – 1.5

2.4

3.4

2.0

0.25 0.4

0.35 0.5

V VCC = MIN

V VCC = MIN, IIN = – 18 mA

V VCC = MIN, IOH = – 3.0 mA

V VCC = MIN, IOH = MAX

V IOL = 12 mA

V IOL = 24 mA

VCC = VCC MIN,

VIN = VIL or VIH

per Truth Table

IOZH

IOZL

IIH

IIL

IOS

ICC

Output Off Current HIGH

Output Off Current LOW

A or B, DR or E

Input HIGH Current DR or E

A or B

Input LOW Current

Output Short Circuit Current (Note 1)

– 40

Power Supply Current

Total, Output HIGH

Total, Output LOW

20

– 200

20

0.1

0.1

– 0.2

– 225

µA VCC = MAX, VOUT = 2.7 V

µA VCC = MAX, VOUT = 0.4 V

µA VCC = MAX, VIN = 2.7 V

mA VCC = MAX, VIN = 7.0 V

mA VCC = MAX, VIN = 5.5 V

mA VCC = MAX, VIN = 0.4 V

mA VCC = MAX

70

90

mA VCC = MAX

Total at HIGH Z

95

Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.

AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V, TRISE / TFALL ≤ 6.0 ns)

Limits

Symbol

Parameter

Min Typ Max Unit

tPLH

tPHL

Propagation Delay, Data to Output

8.0

8.0

12

12

ns

tPZH

Output Enable Time to HIGH Level

25

40

ns

tPZL

Output Enable Time to LOW Level

27

40

ns

tPLZ

Output Disable Time from LOW Level

15

25

ns

tPHZ

Output Disable Time from HIGH Level

15

25

ns

Test Conditions

CL = 45 pF,

RL = 667 Ω

CL = 5.0 pF,

RL = 667 Ω

FAST AND LS TTL DATA

5-399

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