74ACT1284 datasheet(5/11 Pages) STMICROELECTRONICS

部品番号	74ACT1284

部品情報	HIGH SPEED IEEE1284 TRANSCEIVER

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メーカー	STMICROELECTRONICS [STMicroelectronics]

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5 / 11 page

74ACT1284

5/11

TEST CIRCUIT

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

RT =ZOUT of pulse generator (typically 50Ω)

Figure 1 : Propagation Delay Time

TEST

S1

S2

tPHL (A1-A7 to B1-B7) RL =62Ω, R1 =33Ω (see waveform 1)

OPEN

VCC

tPLH (A1-A7 to B1-B7) RL =62Ω (see waveform 1)

CLOSED

GND

tPHL,tPLH (B1-B4 to A1-A4) RL = 500Ω (see waveform 2)

CLOSED

GND

tr,tf (A1-A7 to B1-B7) RL =500Ω (see waveform 1)

CLOSED

VCC

tEN (HD to B1-B7) RL =62Ω, R1 =33Ω (see waveform 3)

OPEN

GND

tDIS (HD to B1-B7) RL =62Ω (see waveform 3)

CLOSED

GND

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