LTC1338CG Просмотр технического описания (PDF) - Linear Technology
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LTC1338CG Datasheet PDF : 8 Pages
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LTC1338
DC ELECTRICAL CHARACTERISTICS VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted.
PARAMETER
Power Supply
VCC Supply Current
Supply Leakage Current (VCC)
Driver/Receiver Enable Threshold Low
Driver/Receiver Enable Threshold High
CONDITIONS
MIN TYP MAX
No Load (All Driver VIN = VCC)(Note 2) 0°C ≤ TA ≤ 70°C
No Load (All Driver VIN = 0V)(Note 2) 0°C ≤ TA ≤ 70°C
No Load (All Driver VIN = VCC)(Note 2) – 40°C ≤ TA ≤ 85°C
No Load (All Driver VIN = 0V)(Note 2) – 40°C ≤ TA ≤ 85°C
RECEIVER ALIVE Mode (Note 4)
q
0.5
1.0
1.0
1.5
0.5
1.5
1.0
2.0
50
80
SHUTDOWN (Note 3)
q
0.2
10
q
1.4
0.8
q 2.0
1.4
UNITS
mA
mA
mA
mA
µA
µA
V
V
AC CHARACTERISTICS VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted.
PARAMETER
Slew Rate
Driver Propagation Delay
(TTL to RS232)
Receiver Propagation Delay
(RS232 to TTL)
CONDITIONS
RL = 3k, CL = 51pF
RL = 3k, CL = 2500pF
tHLD (Figure 1)
tLHD (Figure 1)
tHLR (Figure 2)
tLHR (Figure 2)
MIN
3
q
q
q
q
TYP MAX
8
30
5
2
3.5
2
3.5
0.3
0.8
0.2
0.8
UNITS
V/µs
V/µs
µs
µs
µs
µs
The q denotes specifications which apply over the operating temperature
range of 0°C to 70°C or – 40°C to 85°C.
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 VDRIVER ENABLE and VRECEIVER ENABLE = VCC.
Note 3: Supply current and leakage current measurements in SHUTDOWN
are performed with VDRIVER ENABLE and VRECEIVER ENABLE = 0V.
Note 4: Supply current measurement in RECEIVER ALIVE mode is
performed with VDRIVER ENABLE = 0V and VRECEIVER ENABLE = VCC.
WU
TYPICAL PERFOR A CE CHARACTERISTICS
Driver Output Voltage
10
RL = 3k
8
6
4
OUTPUT HIGH
VCC = 5V
VCC = 4.5V
2
0
–2
OUTPUT LOW
–4
VCC = 4.5V
–6
VCC = 5V
–8
–40 –20 0 20 40 60 80 100
TEMPERATURE (°C)
LTC1338 • TPC01
Receiver Input Thresholds
2.2
2.0
1.8
VTH
1.6
1.4
VTL
1.2
1.0
–40 –20
0 20 40 60 80 100
TEMPERATURE (˚C)
LTC1338 • TPC02
Supply Current vs Data Rate
60
VCC = 5V
RL = 3k
50 CL = 2500pF
5 DRIVERS ACTIVE
40
30
20
10
0
0 20
40 60 80 100 120 140
DATA RATE (k BAUD)
LTC1338 • TPC03
3
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