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参数资料
| 型号： | HC646 |
| 厂商： | NXP Semiconductors N.V. |
| 英文描述： | Octal bus transceiver/register; 3-state |
| 中文描述： | 八路总线收发器/册;三态 |
| 文件页数： | 7/12页 |
| 文件大小： | 91K |
| 代理商： | HC646 |
September 1993
4
Philips Semiconductors
Product specication
Octal bus transceiver/register; 3-state
74HC/HCT646
Fig.4 Functional diagram.
FUNCTION TABLE
Notes
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
↑ = LOW-to-HIGH level transition
2. The data output functions may be enabled or disabled by various signals at the OE and DIR inputs. Data input
functions are always enabled, i.e., data at the bus inputs will be stored on every LOW-to-HIGH transition on the clock
inputs.
INPUTS (1)
DATA I/O (2)
FUNCTION
OE
DIR
CPAB
CPBA
SAB
SBA
A0 to A7
B0 to B7
H
X
H or L
↑
H or L
↑
X
input
isolation
store A and B data
L
X
H or L
X
L
H
output
input
real-time B data to A bus
stored B data to A bus
L
H
X
H or L
X
L
H
X
input
output
real-time A data to B bus
stored A data to B bus
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