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74HC244N 数据表(PDF) 8 Page - NXP Semiconductors

部件名 74HC244N
功能描述  Octal buffer/line driver; 3-state Rev. 4 ??24 September 2012
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制造商  PHILIPS [NXP Semiconductors]
网页  http://www.nxp.com
标志 PHILIPS - NXP Semiconductors

74HC244N 数据表(HTML) 8 Page - NXP Semiconductors

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74HC_HCT244
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 4 — 24 September 2012
8 of 18
NXP Semiconductors
74HC244; 74HCT244
Octal buffer/line driver; 3-state
11. Waveforms
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Fig 6.
Input (nAn) to output (nYn) propagation delays and output transition times
001aae013
tPLH
tPHL
VM
VM
VM
VM
nYn output
nAn input
VI
GND
VOH
VOL
tTLH
tTHL
90 %
10 %
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Fig 7.
3-state enable and disable times
001aae014
tPLZ
tPHZ
outputs
disabled
outputs
enabled
VY
VX
outputs
enabled
nYn output
LOW-to-OFF
OFF-to-LOW
nYn output
HIGH-to-OFF
OFF-to-HIGH
nOE input
VI
VOL
VOH
VCC
VM
GND
GND
tPZL
tPZH
VM
VM
Table 8.
Measurement points
Type
Input
Output
VM
VM
VX
VY
74HC244
0.5
 V
CC
0.5
 V
CC
0.1
 V
CC
0.9
 V
CC
74HCT244
1.3 V
1.3 V
0.1
 V
CC
0.9
 V
CC


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