74AC245 Просмотр технического описания (PDF) - STMicroelectronics

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74AC245

OCTAL BUS TRANSCEIVER WITH 3 STATE OUTPUTS (NON INVERTED)

STMicroelectronics 

74AC245

AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, RL = 500 Ω, Input tr = tf = 3ns)

Test Condition

Value

Symbol

Parameter

VCC

(V)

tPLH tPHL Propagation Delay

Time

tPZL tPZH Output Enable

Time

tPLZ tPHZ Output Disable

Time

3.3(*)

5.0(**)

3.3(*)

5.0(**)

3.3(*)

5.0(**)

TA = 25°C

-40 to 85°C -55 to 125°C Unit

Min. Typ. Max. Min. Max. Min. Max.

1.5 5.5 8.5 1.5 9.0 1.5 11.5

ns

1.5 4.5 6.5 1.5 7.0 1.5 8.5

1.5 7.5 12.0 1.5 13.5 1.5 14.0

ns

1.5 5.5 9.0 1.5 9.5 1.5 10.5

1.5 6.2 12.0 1.5 13.0 1.5 14.0

ns

1.5 5.2 9.0 1.5 10.0 1.5 10.5

(*) Voltage range is 3.3V ± 0.3V

(**) Voltage range is 5.0V ± 0.5V

CAPACITIVE CHARACTERISTICS

Test Condition

Value

Symbol

Parameter

VCC

(V)

TA = 25°C

-40 to 85°C -55 to 125°C Unit

Min. Typ. Max. Min. Max. Min. Max.

CIN Input Capacitance 5.0

5

pF

CI/O I/O Capacitance

5.0

10

pF

CPD Power Dissipation

Capacitance (note 5.0

fIN = 10MHz

21

pF

1)

1) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without

load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. ICC(opr) = CPD x VCC x fIN + ICC/16 (per

circuit)

TEST CIRCUIT

TEST

tPLH, tPHL

tPZL, tPLZ

tPZH, tPHZ

CL = 50pF or equivalent (includes jig and probe capacitance)

RL = R1 = 500Ω or equivalent

RT = ZOUT of pulse generator (typically 50Ω)

4/9

SWITCH

Open

2VCC

Open

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