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LT1080 Datasheet(Fiches technique) 4 Page - Linear Technology

Numéro de pièce LT1080
Description  Advanced Low Power 5V RS232 Dual Driver/Receiver
Télécharger  12 Pages
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Fabricant  LINER [Linear Technology]
Site Internet  http://www.linear.com
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4
LT1080/LT1081
PI FU CTIO S (Pin numbers refer to LT1080)
TEMPERATURE (
°C)
–55
–25
0
25
50
75
100
125
1080/81 G01
10
8
6
4
2
0
–2
–4
–6
–8
–10
VCC = 5.5V
VCC = 4.5V
RL = 3k
OUTPUT HIGH
VCC = 5.5V
VCC = 4.5V
OUTPUT LOW
VCC = 5V
VCC = 5V
TIME (ms)
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
1080/81 G03
10
8
6
4
2
0
–2
–4
–6
–8
–10
V+ SUPPLY
VCC = 5V
C1 TO C4 = 1
µF
RL = 4.7k; V
+ TO V
VSUPPLY
OUTPUT CURRENT (mA)
02468
10 12 14 16 18 20
1080/81 G02
10
8
6
4
2
0
–2
–4
–6
–8
–10
VCC = 5V
V+ OUTPUT VOLTAGE
LOADED TO V
LOADED TO GROUND
LOADED TO GROUND
LOADED TO V+
VOUTPUT VOLTAGE
Driver Output Voltage
Supply Generator Outputs
Supply Generation from VCC
or Shutdown
C1+; C1; C2+; C2(Pins 2, 4, 5, 6): Requires an external
capacitor (
≥1µF) from C1+ to C1and another from C2+
to C2. Pin 2 can be used for connecting a second positive
supply. When a separate positive supply is used, C1 can be
deleted.
V+ (Pin 3): Positive Supply for RS232 Drivers.
V+
≈ 2VCC – 1.5V. Requires an exterenal capacitor (≥1µF)
for charge storage. May be loaded (up to 15mA) for
external system use. Loading does reduce V+ voltage (see
graphs). Capacitor may be tied to ground or +5V input
supply. With multiple transceivers, the V+ and Vpins may
be paralleled into common capacitors.
V(Pin 7): Negative Supply for RS232 Drivers.
V
≈ –(2VCC – 2.5V). Requires an external capacitor
(
≥1µF) for charge stroage. May be loaded (up to –15mA)
for external system use. Loading does reduce Vvoltage
(see graphs). With multiple transceivers, the V+ and V
pins may be paralleled into common capacitors.
TR2 OUT; TR1 OUT (Pins 8, 15): Driver Outputs with
RS232 Voltage Levels. Outputs are in a high impedance
state when in the SHUTDOWN mode or when power is off
(VCC = 0V) to allow data line sharing. Outputs are fully
short-circuit protected from (V+ 30V) to (V+ – 30V) with
power on, off or in the SHUTDOWN mode. Typical output
breakdowns are greater than
±45V and higher applied
voltages will not damage the device if moderately current
limited. Shorting one output will affect output from the
other.
REC2 IN; REC1 IN (Pins 9, 14): Receiver Inputs. Accepts
RS232 voltage levels (
±30V) and has 0.4V of hysteresis to
provide noise immunity. Input impedance is nominally
5k
Ω.
REC2 OUT; REC1 OUT (Pins 10, 13): Receiver Outputs
with TTL/CMOS Voltage Levels. Outputs are in a high
impedance state when in the SHUTDOWN mode to allow
data line sharing. Outputs are fully short-circuit protected
to ground or VCC with power on, off or in the SHUTDOWN
mode.
TR2 IN; TR1 IN (Pins 11, 12): RS232 Driver Input Pins.
Inputs are TTL/CMOS compatible. Inputs should not be
allowed to float. Tie unused inputs to VCC.
GND (Pin 16): Ground Pin.
VCC (Pin 17): Input Supply Pin. Supply current drops to
zero in the SHUTDOWN mode.
ON/OFF (Pin 18): Contols the operation mode of the
LT1080 and is TTL/CMOS compatible. A logic low puts the
device in the SHUTDOWN mode which reduces input
supply current to zero and places both driver and receiver
outputs in a high impedance state. A logic high fully
enables the device.
TYPICAL PERFOR A CE CHARACTERISTICS




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