LTC1348 Просмотр технического описания (PDF) - Linear Technology
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LTC1348 Datasheet PDF : 8 Pages
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DC ELECTRICAL CHARACTERISTICS
VCC = 3V to 5.5V, C1 to C4 = 0.1µF, unless otherwise noted.
PARAMETER
Power Supply Generator
V+ Output Voltage
V– Output Voltage
Supply Rise Time
Power Supply
VCC Supply Current
Supply Leakage Current (VCC)
Driver/Receiver Enable Threshold Low
Driver/Receiver Enable Threshold High
Driver/Receiver Enable Threshold High
CONDITIONS
IOUT = 0mA
IOUT = 8mA
IOUT = 0mA
IOUT = – 8mA
Shutdown to Turn-On
No Load (Note 2) VCC = 3.3V
No Load (Note 2) VCC = 5V
Receiver Alive Mode (Note 4) VCC = 3.3V or 5V
Shutdown (Note 3)
VCC = 3.3V
VCC = 5V
LTC1348
MIN TYP MAX
8.0
7.5
– 8.0
– 7.0
0.2
q
0.6
2.0
q
0.8
2.5
q
15
30
q
0.2
10
q
0.8
q 2.0
q 2.4
UNITS
V
V
V
V
ms
mA
mA
µA
µA
V
V
V
AC ELECTRICAL CHARACTERISTICS
VCC = 3V to 5.5V, C1 to C4 = 0.1µF, unless otherwise noted.
PARAMETER
Maximum Data Rate
Slew Rate
Driver Propagation Delay
(TTL to RS232)
Receiver Propagation Delay
(RS232 to TTL)
CONDITIONS
RL = 3k, CL = 1000pF, One Driver Switching
VCC = 5V, RL = 3k, CL = 51pF
VCC = 3.3V, RL = 3k, CL = 2500pF
tHLD (Figure 1)
tLHD (Figure 1)
tHLR (Figure 2) (Normal Mode)
tLHR (Figure 2) (Normal Mode)
tHLR (Figure 2) (Receiver Alive Mode)
tLHR (Figure 2) (Receiver Alive Mode)
MIN TYP MAX
120
250
8
30
3
q
2.5
4
q
2.5
4
q
0.3
1
q
0.2
1
q
1.0
4
q
0.2
4
UNITS
kbps
V/µs
V/µs
µs
µs
µs
µs
µs
µs
The q denotes specifications which apply over the full 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: Supply current is measured with driver and receiver outputs
unloaded. The VDREN and VRXEN = VCC.
Note 3: Supply current measurement in Shutdown is performed with
VDREN and VRXEN = 0V.
Note 4: Supply current measurement in Receiver Alive mode is performed
with VDREN = 0V and VRXEN = VCC.
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