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參數(shù)資料
| 型號： | MC14458 |
| 廠商： | Motorola, Inc. |
| 英文描述： | Encoder and Decoder Pairs |
| 中文描述： | 編碼器和解碼器雙 |
| 文件頁數(shù)： | 9/20頁 |
| 文件大?。?/td> | 233K |
| 代理商： | MC14458 |
MC145026
MC145027
MC145028
SC41343
SC41344
MOTOROLA
9
R1, C1
Resistor 1, Capacitor 1 (Pins 6, 7)
As shown in Figures 2 and 3, these pins accept a resistor
and capacitor that are used to determine whether a narrow
pulse or wide pulse has been received. The time constant
R1 x C1 should be set to 1.72 encoder clock periods:
R1 C1 = 3.95 RTC CTC
R2/C2
Resistor 2/Capacitor 2 (Pin 10)
As shown in Figures 2 and 3, this pin accepts a resistor and
capacitor that are used to detect both the end of a received
word and the end of a transmission. The time constant R2 x
C2 should be 33.5 encoder clock periods (four data periods
per Figure 11): R2 C2 = 77 RTC CTC. This time constant is
used to determine whether the Din pin has remained low for
four data periods (end of transmission). A separate on–chip
comparator looks at the voltage–equivalent two data periods
(0.4 R2 C2) to detect the dead time between received words
within a transmission.
VT
Valid Transmission Output (Pin 11)
This valid transmission output goes high after the second
word of an encoding sequence when the following conditions
are satisfied:
1.the received addresses of both words match the local de-
coder address, and
2.the received data bits of both words match.
VT remains high until either a mismatch is received or no
input signal is received for four data periods.
VSS
Negative Power Supply (Pin 8)
The most–negative supply potential. This pin is usually
ground.
VDD
Positive Power Supply (Pin 16)
The most–positive power supply pin.
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