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74HC243 数据表(PDF) 11 Page - NXP Semiconductors

部件名 74HC243
功能描述  Quad bus transceiver; 3-state
Download  17 Pages
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制造商  PHILIPS [NXP Semiconductors]
网页  http://www.nxp.com
标志 PHILIPS - NXP Semiconductors

74HC243 数据表(HTML) 11 Page - NXP Semiconductors

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9397 750 13808
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet
Rev. 03 — 12 November 2004
11 of 17
Philips Semiconductors
74HC243
Quad bus transceiver; 3-state
VM = 0.5 × VI.
Fig 7.
Waveforms showing the 3-state enable and disable times for input OEB
Test data is given in Table 9.
Definitions for test circuit:
RL = Load resistor.
CL = Load capacitance including jig and probe capacitance.
RT = Termination resistance should be equal to the output impedance Zo of the pulse
generator.
Fig 8.
Load circuitry for switching times
Table 9:
Test data
Supply
Input
Load
S1
VCC
VI
tr = tf
CL
RL
tPZL, tPLZ
tPZH, tPHZ
tPHL, tPLH
2.0 V
VCC
6 ns
50 pF
1 k
VCC
GND
open
4.5 V
VCC
6 ns
50 pF
1 k
VCC
GND
open
6.0 V
VCC
6 ns
50 pF
1 k
VCC
GND
open
5.0 V
VCC
6 ns
15 pF
1 k
VCC
GND
open
VM
OEB input
output
LOW to OFF
OFF to LOW
output
HIGH to OFF
OFF to HIGH
VM
001aab956
tf
tr
90 %
10 %
tPLZ
VM
tPZL
tPHZ
tPZH
10 %
90 %
outputs
disabled
outputs
enabled
outputs
enabled
open
GND
VCC
VCC
VI
VO
mna232
D.U.T.
CL
RT
RL =
1000
PULSE
GENERATOR
S1


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