LTC1387 View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC1387 Datasheet PDF : 12 Pages
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LTC1387
DC ELECTRICAL CHARACTERISTICS
TA = 25°C, VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF (Notes 2, 3), unless otherwise noted.
SYMBOL PARAMETER
RS485 Receiver (485/232 = High, ON = RXEN = High)
VTH
Differential Input Threshold Voltage
∆VTH
Input Hysteresis
IIN
Input Current (A, B)
RIN
Input Resistance
RS232 Receiver (485/232 = Low, ON = RXEN = High)
VTH
Receiver Input Voltage Threshold
∆VTH
Receiver Input Hysteresis
RIN
Receiver Input Resistance
Receiver Output (ON = RXEN = High)
VOH
Receiver Output High Voltage
VOL
Receiver Output Low Voltage
IOSR
Short-Circuit Current
IOZR
Three-State Output Current
Power Supply Generator
VDD
VDD Output Voltage
VEE
VEE Output Voltage
Power Supply
ICC
VCC Supply Current
CONDITIONS
MIN TYP MAX UNITS
– 7V ≤ VCM ≤ 12V
VCM = 0V
VIN = 12V
VIN = – 7V
– 7V ≤ VIN ≤ 12V
Input Low Threshold
Input High Threshold
VIN = ±10V
q – 0.20
0.20
V
40
mV
q
q – 0.8
1
mA
mA
q 12
24
kΩ
q 0.8
q
V
2.4
V
0.6
V
3
5
7
kΩ
IO = – 3mA, VIN = 0V, 485/232 = Low
q 3.5
4.6
V
IO = 3mA, VIN = 3V, 485/232 = Low
q
0.2
0.4
V
0V ≤ VO ≤ VCC
q7
85
mA
RXEN = 0V
q
±0.1 ±10
µA
No Load, ON = DXEN = RXEN = High
IDD = – 5mA, ON = DXEN = RXEN = High
No Load, ON = DXEN = RXEN = High
IEE = 5mA, ON = DXEN = RXEN = High
No Load, ON = DXEN = RXEN = High
q
Shutdown, ON = DXEN = RXEN = 0V
q
8
V
7
V
– 7.7
V
– 7.0
V
7
25
mA
5
100
µA
AC ELECTRICAL CHARACTERISTICS
TA = 25°C, VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF (Notes 2, 3), unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
RS232 Mode (ON = DXEN = RXEN = High, 485/232 = Low)
SR
Slew Rate
Figure 4, RL = 3k, CL = 15pF
Figure 4, RL = 3k, CL = 1000pF
tT
Transition Time
Figure 4, RL = 3k, CL = 2500pF
tPLH
Driver Input to Output
Figures 4, 10, RL = 3k, CL = 15pF
tPHL
Driver Input to Output
Figures 4, 10, RL = 3k, CL = 15pF
tPLH
Receiver Input to Output
Figures 5, 11
tPHL
Receiver Input to Output
Figures 5, 11
RS485 Mode (Fast Slew Rate, ON = DXEN = High, 485/232 = High, SLEW = High)
t PLH
t PHL
tSKEW
tr, tf
Driver Input to Output
Driver Input to Output
Driver Output to Output
Driver Rise or Fall Time
Figures 2, 7, RL = 54Ω, CL = 100pF
Figures 2, 7, RL = 54Ω, CL = 100pF
Figures 2, 7, RL = 54Ω, CL = 100pF
Figures 2, 7, RL = 54Ω, CL = 100pF
MIN TYP MAX UNITS
q
q4
30
V/µs
V/µs
q 0.22
1.9
3.1
µs
q
0.6
4
µs
q
0.6
4
µs
q
0.3
6
µs
q
0.4
6
µs
q 15
40
70
ns
q 15
40
70
ns
q
5
15
ns
q3
15
40
ns
3
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