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MC145408LP 数据表(PDF) 5 Page - LANSDALE Semiconductor Inc.

部件名 MC145408LP
功能描述  Drivers/Receivers RS 232/EIA??32?밇 and CCITT V.28
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制造商  LANSDALE [LANSDALE Semiconductor Inc.]
网页  http://www.lansdale.com
标志 LANSDALE - LANSDALE Semiconductor Inc.

MC145408LP 数据表(HTML) 5 Page - LANSDALE Semiconductor Inc.

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Issue A
PIN DESCRIPTIONS
VCC
Digital Power Supply
The digital supply pin, which is connected to the logic power
supply (+ 5.5 V maximum).
GND
Ground
Ground return pin is typically connected to the signal ground
pin of the EIA–232–E connector (Pin 7) as well as to the logic
power supply ground.
VDD
Most Positive Device Pin
The most positive power supply pin, which is typically + 5 to
+ 12 V.
VSS
Most Negative Device Pin
The most negative power supply pin, which is typically – 5 to – 12 V.
Rx1 – Rxn
Receive Data Input Pins
These are the EIA–232–E receive signal inputs. A voltage
between + 3 and + 25 V is decoded as a space, and causes the
corresponding DO pin to swing to ground (0 V). A voltage
between – 3 and – 25 V is decoded as a mark, and causes the
corresponding DO pin to swing to VCC.
DO1 – DOn
Data Output Pins
These are the receiver digital output pins which swing
fromVCC to GND. Each output pin is capable of driving one
LSTTL input load.
LANSDALE Semiconductor, Inc.
ML145403, ML145404, ML145405, ML145408
Figure 1. Power–Off Source Resistance
Illustrated for ML145408
DI5
14
1
24
11
VDD
16
18
20
22
9
3
5
7
13
12
GND
VDD VCC
DI4
DI3
DI2
DI1
Tx5
Tx4
Tx3
Tx2
Tx1
Vin = ± 2 V
Rout
Vin
I
Figure 2. Switching Characteristics
50%
DI
+ 3 V
0 V
tf
10%
90%
tr
tPHL
tPLH
VOL
VOH
Tx
DRIVERS
50%
Rx
+ 3 V
0 V
tf
10%
90%
tr
tPHL
tPLH
VOL
VOH
DO
RECEIVERS
Figure 3. Slew Rate Characteristics
Tx
+ 3 V
tSHL
DRIVERS
+ 3 V
tSLH
– 3 V
– 3 V
Slew Rate =
6 V
tSLH or tSHL


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