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74ACT1284 数据表(PDF) 5 Page - STMicroelectronics

部件名 74ACT1284
功能描述  HIGH SPEED IEEE1284 TRANSCEIVER
PDF  11 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

74ACT1284 数据表(HTML) 5 Page - STMicroelectronics

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74ACT1284
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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
S2
tPHL (A1-A7 to B1-B7) RL =62Ω, R1 =33Ω (see waveform 1)
OPEN
VCC
VCC
tPLH (A1-A7 to B1-B7) RL =62Ω (see waveform 1)
CLOSED
GND
GND
tPHL,tPLH (B1-B4 to A1-A4) RL = 500Ω (see waveform 2)
CLOSED
GND
GND
tr,tf (A1-A7 to B1-B7) RL =500Ω (see waveform 1)
CLOSED
VCC
VCC
tEN (HD to B1-B7) RL =62Ω, R1 =33Ω (see waveform 3)
OPEN
GND
GND
tDIS (HD to B1-B7) RL =62Ω (see waveform 3)
CLOSED
GND
GND



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