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| 74HC244D Datasheet, PDF (8/18 Pages) NXP Semiconductors – Octal buffer/line driver; 3-state | |||
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NXP Semiconductors
11. Waveforms
74HC244; 74HCT244
Octal buffer/line driver; 3-state
VI
nAn input
GND
VOH
nYn output
VOL
VM
90 %
t PHL
VM
10 %
t THL
VM
t PLH
VM
t TLH
001aae013
Fig 6.
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Input (nAn) to output (nYn) propagation delays and output transition times
VI
nOE input
GND
VCC
nYn output
LOW- to - OFF
OFF- to - LOW
VOL
VOH
nYn output
HIGH- to - OFF
OFF- to - HIGH
GND
VM
t PLZ
t PZL
t PHZ
VX
VY
outputs
enabled
VM
t PZH
VM
outputs
disabled
outputs
enabled
001aae014
Fig 7.
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
3-state enable and disable times
Table 8. Measurement points
Type
Input
74HC244
74HCT244
VM
0.5 ï´ VCC
1.3 V
Output
VM
0.5 ï´ VCC
1.3 V
VX
0.1 ï´ VCC
0.1 ï´ VCC
VY
0.9 ï´ VCC
0.9 ï´ VCC
74HC_HCT244
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 4 â 24 September 2012
© NXP B.V. 2012. All rights reserved.
8 of 18
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