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參數(shù)資料
| 型號： | 74HC245 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Octal bus transceiver; 3-state |
| 中文描述： | 8個(gè)三態(tài)總線收發(fā)器, 3態(tài) |
| 文件頁數(shù)： | 13/22頁 |
| 文件大?。?/td> | 130K |
| 代理商： | 74HC245 |
9397 750 14502
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 03 — 31 January 2005
13 of 22
Philips Semiconductors
74HC245; 74HCT245
Octal bus tranceiver; 3-state
12. Waveforms
Measurement points are given in
Table 11
.
V
OL
and V
OH
are typical voltage output drop that occur with the output load.
Input (An, Bn) to output (Bn, An) propagation delays and output transition times
Fig 5.
Measurement points are given in
Table 11
.
V
OL
and V
OH
are typical voltage output drop that occur with the output load.
3-state output enable and disable times
Fig 6.
Table 11:
Type
Measurement points
Input
V
M
0.5V
CC
1.3 V
Output
V
M
0.5V
CC
1.3 V
74HC245
74HCT245
001aac433
t
PLH
t
PHL
VM
V
M
90 %
10 %
V
M
V
M
Bn, An output
An, Bn input
V
I
GND
V
OH
V
OL
t
TLH
t
THL
001aac479
t
PLZ
t
PHZ
outputs
disabled
outputs
enabled
90 %
10 %
outputs
enabled
OE input
V
I
V
CC
V
OL
V
OH
GND
GND
V
M
t
PZL
t
PZH
V
M
V
M
output
LOW-to-OFF
OFF-to-LOW
output
HIGH-to-OFF
OFF-to-HIGH
t
r
t
f
90 %
10 %
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