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74ABT853N 데이터시트(PDF) 7 Page - NXP Semiconductors |
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74ABT853N 데이터시트(HTML) 7 Page - NXP Semiconductors |
7 / 7 page Philips Semiconductors Product specification 74ABT853 8-bit transceiver with 9-bit parity checker/ generator and flag latch (3-State) 1995 Sep 06 7 TYPICAL PROPAGATION DELAYS VERSUS LOAD FOR OPEN COLLECTOR OUTPUTS 0 2 4 6 8 10 12 14 16 18 0 100 200 300 400 500 600 Load resistor ( Ω) tPLH tPHL NOTE: When using Open-Collector parts, the value of the pull–up resistor greatly affects the value of the tPLH. For example, changing the specified pull-up resistor value from 500 Ω to 100Ω will improve the tPLH over 300% with only a slight change in the tPHL. However, if the value of the pull-up resistor is changed, the user must make certain that the total IOL current through the resistor and the total IIL’s of the receivers does not exceed the IOL maximum specification. SA00241 TEST CIRCUIT AND WAVEFORM LOAD VALUES OUTPUT RX VX ERROR 100 Ω VCC All other 500 Ω 7.0V PULSE GENERATOR RT VIN D.U.T VOUT CL RL VCC RX VX Test Circuit for 3-State Outputs VM VM tW AMP (V) NEGATIVE PULSE 10% 10% 90% 90% 0V VM VM tW AMP (V) POSITIVE PULSE 90% 90% 10% 10% 0V tTHL (tF) tTLH (tR)tTHL (tF) tTLH (tR) VM = 1.5V Input Pulse Definition DEFINITIONS RL = Load resistor; see AC CHARACTERISTICS for value. CL = Load capacitance includes jig and probe capacitance; see AC CHARACTERISTICS for value. RT = Termination resistance should be equal to ZOUT of pulse generators. INPUT PULSE REQUIREMENTS FAMILY Amplitude Rep. Rate tW tR tF 74ABT 3.0V 1MHz 500ns 2.5ns 2.5ns SWITCH POSITION TEST SWITCH tPLZ closed tPZL closed All other open SA00242 |
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