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MC145027P bảng dữ liệu(PDF) 10 Page - Freescale Semiconductor, Inc

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MC145026, MC145027, MC145028 Technical Data, Rev. 4
10
Freescale Semiconductor
Pin Descriptions
If an external signal source is used instead of the internal oscillator, it should be connected to the RS input
and the RTC and CTC pins should be left open.
TE
Transmit Enable (Pin 14)
This active-low transmit enable input initiates transmission when forced low. An internal pull-up device
keeps this input normally high. The pull-up current is specified in the Electrical Characteristics table.
Dout
Data Out (Pin 15)
This is the output of the encoder that serially presents the encoded data word.
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.
4.2
MC145027 and MC145028 Decoders
A1 - A5, A1 - A9
Address Inputs (Pins 1 - 5)-MC145027,
Address Inputs (Pins 1 - 5, 15, 14, 13, 12)-MC145028
These are the local address inputs. The states of these pins must match the appropriate encoder inputs for
the VT pin to go high. The local address may be encoded with trinary or binary data.
D6 - D9
Data Outputs (Pins 15, 14, 13, 12)-MC145027 Only
These outputs present the binary information that is on encoder inputs A6/D6 through A9/D9. Only binary
data is acknowledged; a trinary open at the MC145026 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 driving this pin must be dc coupled.


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