MC145408 Motorola, MC145408 Datasheet - Page 5

• Manufacturer Part Number: MC145408
• Description: (MC145403 - MC145408) DRIVER / RECEIVERS
• Manufacturer: Motorola

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DataSheet
4
V CC
Digital Power Supply
power supply (+ 5.5 V maximum).
GND
Ground
ground pin of the EIA–232–E connector (Pin 7) as well as to
the logic power supply ground.
V DD
Most Positive Device Pin
to + 12 V.
MOTOROLA
U
.com
The digital supply pin, which is connected to the logic
Ground return pin is typically connected to the signal
The most positive power supply pin, which is typically + 5
RECEIVERS
DRIVERS
DI
Tx
Rx
DO
t PHL
PIN DESCRIPTIONS
Figure 2. Switching Characteristics
90%
50%
50%
90%
t PHL
10%
10%
t f
t f
t PLH
Figure 1. Power–Off Source Resistance
22
20
18
16
14
Illustrated for MC145408
DI1
DI2
DI3
DI4
DI5
1
V DD
t PLH
V DD V CC
12
t r
t r
GND
+ 3 V
0 V
V OH
V OL
+ 3 V
0 V
V OH
V OL
Tx1
Tx2
Tx3
Tx4
Tx5
24
13
3
5
7
9
11
V SS
Most Negative Device Pin
to – 12 V.
Rx1 – Rx n
Receive Data Input Pins
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 V CC .
DO1 – DO n
Data Output Pins
V CC to GND. Each output pin is capable of driving one
LSTTL input load.
The most negative power supply pin, which is typically – 5
These are the EIA–232–E receive signal inputs. A voltage
These are the receiver digital output pins which swing from
R
out
MC145403 MC145404 MC145405 MC145408
+
V in =
V
I
in
DRIVERS
Tx
2 V
– 3 V
Figure 3. Slew Rate Characteristics
+ 3 V
Slew Rate =
t SHL
t SLH or t SHL
6 V
+ 3 V
– 3 V
t SLH
5