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MC145027DW bảng dữ liệu(PDF) 8 Page - LANSDALE Semiconductor Inc.

tên linh kiện MC145027DW
Giải thích chi tiết về linh kiện  Encoder and Decoder Pairs
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nhà sản xuất  LANSDALE [LANSDALE Semiconductor Inc.]
Trang chủ  http://www.lansdale.com
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Issue 0
LANSDALE Semiconductor, Inc.
ML145026, ML145027, ML145028
acknowledged; a trinary open at the ML145026 encoder is
decoded as a high level (logic 1).
Din
Data In (Pin 9)
This pin is the serial data input to the decoder. The input
voltage must be at CMOS logic levels. The signal source driv-
ing this pin must be DC coupled.
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 com-
parator 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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