MC145403 View Datasheet(PDF) - Motorola => Freescale
Part Name
Description
Manufacturer
MC145403 Datasheet PDF : 9 Pages
| |||
1
24
22
VDD VCC 3
DI1
Tx1
20
DI2
5
Tx2
18
DI3
7
Tx3
16
DI4
9
Tx4
14
DI5
11
Tx5
VDD GND
12 13
Vin = ± 2 V
+ Rout
Vin
I
DRIVERS
DI
50%
tf
Tx
90%
10%
tPHL
RECEIVERS
Rx
50%
tPHL
90%
DO
10%
tf
Figure 1. Power–Off Source Resistance
Illustrated for MC145408
+3V
0V
tr
VOH
VOL
tPLH
+3V
0V
tPLH
VOH
VOL
tr
DRIVERS
+3V
Tx
–3V
tSHL
+3V
–3V
tSLH
Slew Rate =
6V
tSLH or tSHL
Figure 2. Switching Characteristics
Figure 3. Slew Rate Characteristics
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 from
VCC to GND. Each output pin is capable of driving one
LSTTL input load.
MOTOROLA
MC145403•MC145404•MC145405•MC145408
5
Share Link: 