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LT1280A Datasheet(PDF) 3 Page - Linear Technology

Part No. LT1280A
Description  Low Power 5V RS232 Dual Driver/Receiver with 0.1uF Capacitors
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LT1280A Datasheet(HTML) 3 Page - Linear Technology

   
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LT1280A/LT1281A
Driver Output Voltage
TEMPERATURE (°C)
–55
–10
–8
–4
–2
0
10
4
0
50
75
LT1280A • TPC03
–6
6
8
2
–25
25
100
125
OUTPUT HIGH
OUTPUT LOW
RL = 3k
VCC = 5V
VCC = 4.5V
VCC = 5.5V
VCC = 4.5V
VCC = 5V
VCC = 5.5V
CC
HARA TERISTICS
A
TYPICALPERFOR
CE
ELECTRICAL C
C
HARA TERISTICS (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Logic Input Current
0.8V
≤ VIN ≤ 2.0V
q
520
µA
Output Short-Circuit Current
VOUT = 0V
±917
mA
Output Leakage Current
Shutdown VOUT = ±30V (Note 4)
q
10
100
µA
Data Rate (Note 7)
RL = 3k, CL = 2500pF
120
kBaud
RL = 3k, CL = 1000pF
250
kBaud
Slew Rate
RL = 3k, CL = 51pF
15
30
V/
µs
RL = 3k, CL = 2500pF
4
7
V/
µs
Propagation Delay
Output Transition tHL High-to-Low (Note 5)
0.6
1.3
µs
Output Transition tLH Low-to-High
0.5
1.3
µs
Receiver
Input Voltage Thresholds
Input Low Threshold (VOUT = High)
C Grade
q
0.8
1.3
V
Input High Threshold (VOUT = Low)
C Grade
q
1.7
2.4
V
Input Low
I Grade
q
0.2
1.3
V
Input High
I Grade
q
1.7
3.0
V
Hysteresis
q
0.1
0.4
1.0
V
Input Resistance
VIN = ±10V
357
k
Output Leakage Current
Shutdown (Note 4) 0
≤ VOUT ≤ VCC
q
110
µA
Output Voltage
Output Low, IOUT = – 1.6mA
q
0.2
0.4
V
Output High, IOUT = 160µA (VCC = 5V)
q
3.5
4.2
V
Output Short-Circuit Current
Sinking Current, VOUT = VCC
–20
– 10
mA
Sourcing Current, VOUT = 0V
10
20
mA
Propagation Delay
Output Transition tHL High-to-Low (Note 6)
250
600
ns
Output Transition tLH Low-to-High
350
600
ns
Note 4: Supply current measurements in shutdown are performed with
VON/OFF ≤ 0.1V.
Note 5: For driver delay measurements, RL = 3k and CL = 51pF. Trigger
points are set between the driver’s input logic threshold and the output
transition to the zero crossing (tHL = 1.4V to 0V and tLH = 1.4V to 0V).
Note 6: For receiver delay measurements, CL = 51pF. Trigger points are
set between the receiver’s input logic threshold and the output transition
to standard TTL/CMOS logic threshold (tHL = 1.3V to 2.4V and tLH = 1.7V
to 0.8V).
Note 7: Data rate operation guaranteed by slew rate, short-circuit current
and propagation delay tests.
The q denotes specifications which apply over the operating temperature
range (0
°C ≤ TA ≤ 70°C for commercial grade, and –40°C ≤ TA ≤ 85°C for
industrial grade.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: Testing done at VCC = 5V and VON/OFF = 3V, unless otherwise
specified.
Note 3: Supply current is measured as the average over several charge
pump cycles. C + = C = C1 = C2 = 0.1
µF. All outputs are open, with all
driver inputs tied high.
Driver Maximum Output Voltage
vs Load Capacitance
LOAD CAPACITANCE (nF)
0
5.0
5.5
6.0
6.5
7.0
7.5
8.0
24
6
8
LT1280A • TPC01
10
1357
9
20k BAUD
60k BAUD
120k BAUD
Driver Minimum Output Voltage
vs Load Capacitance
LOAD CAPACITANCE (nF)
0
–7.0
–6.5
–6.0
–5.5
–5.0
–4.5
–4.0
24
6
8
LT1280A • TPC02
10
1357
9
120k BAUD
60k BAUD
20k BAUD


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