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ML145406 Fiches technique(PDF) 4 Page - LANSDALE Semiconductor Inc.

No de pièce ML145406
Description  Driver/Receiver EIA 232-E and CCITT V.28 (Formerly RS-232-D)
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Fabricant  LANSDALE [LANSDALE Semiconductor Inc.]
Site Internet  http://www.lansdale.com
Logo LANSDALE - LANSDALE Semiconductor Inc.

ML145406 Fiches technique(HTML) 4 Page - LANSDALE Semiconductor Inc.

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Issue A
LANSDALE Semiconductor, Inc.
ML145406
Vin = ± 2V
3
5
7
14
12
10
89
116
VDD VCC
DI1
DI2
DI3
VSS GND
Tx3
Tx2
Tx1
Rout =
Vin
I
Figure 1. Power–Off Source Resistance (Drivers)
Figure 2. Switching Characteristics
Figure 3. Slew–Rate Characterization
DRIVERS
DI1–DI3
3 V
0 V
VOH
VOL
Tx1–Tx3
tPLH
tPHL
50%
tf
tr
10%
90%
RECEIVERS
Rx1–Rx3
DO1–DO3
+ 3 V
0 V
VOH
VOL
tPLH
tPHL
tf
tr
50%
DRIVERS
Tx1–Tx3
90%
50%
3 V
– 3 V
3 V
– 3 V
tSHL
tSLH
SLEW RATE (SR) =
– 3 V – (3 V)
OR
3 V – ( – 3 V)
tSLH
tSHL
10%
PIN DESCRIPTIONS
VDD
Positive Power Supply (Pin 1)
The most positive power supply pin, which is typically + 5
to +12V.
VSS
Negative Power Supply (Pin 8)
The most negative power supply pin, which is typically – 5
to –12 V.
VCC
Digital Power Supply (Pin 16)
The digital supply pin, which is connected to the logic power sup-
ply (maximum +5.5 V). VCC must be less than or equal to VDD.
GND
Ground (Pin 9)
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.
Rx1, Rx2, Rx3
Receive Data Input (Pins 2, 4, 6)
These are the EIA 232–E receive signal inputs whose volt-
ages can range from (VDD + 15 V) to (VSS – 15 V). A volt-
age between +3 and (VDD + 15 V) is decoded as a space and
causes the corresponding DO pin to swing to ground (0V); a
voltage between – 3 and (VDD – 15 V) is decoded as a mark
and causes the DO pin to swing up to VCC. The actual turn–on
input switch point is typically biased at 1.8 V above ground,
and includes 800mV of hysteresis for noise rejection. The
nominal input impedance is 5 k
Ω. An open or grounded input
pin is interpreted as a mark, forcing the DO pin to VCC.
DO1, DO2, DO3
Data Output (Pins 11, 13, 15)
These are the receiver digital output pins, which swing from
VCC to GND. A space on the Rx pin causes DO to produce a
logic 0; a mark produces a logic 1. Each output pin is capable
of driving one LSTTL input load.
DI1, DI2, DI3
Data Input (Pins 10, 12,14)
These are the high–impedance digital input pins to the driv-
ers. TTL compatibility is accomplished by biasing the input
switchpoint at 1.4 V above GND. However, 5V CMOS compat-
ibility is maintained as well. Input voltage levels on these pins
must be between VCC and GND.
Tx1, Tx2, Tx3
Transmit Data Output(Pins 3, 5, 7)
These are the EIA 232–E transmit signal output pins, which
swing toward VDD and VSS. A logic 1 at a DI input causes the
corresponding Tx output to swing toward VSS. A logic 0 caus-
es the output to swing toward VDD (the output voltages will be
slightly less than VDD or VSS depending upon the output
load). Output slew rates are limited to a maximum of 30 V per
µs. When the ML145406 is off (VDD = VSS = VCC= GND),
the minimum output impedance is 300
Ω.


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