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LTC2873 データシート(PDF) 3 Page - Analog Devices

部品番号 LTC2873
部品情報  Single-Bus RS485/RS232 Multiprotocol Transceiver with Switchable Termination
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メーカー  AD [Analog Devices]
ホームページ  http://www.analog.com
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LTC2873 データシート(HTML) 3 Page - Analog Devices

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LTC2873
3
REV B
For more information www.analog.com
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = VL = 3.3V, TE485 = VL, LB = 0V unless otherwise noted. (Notes 2, 6)
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Supplies
VCC
Supply Voltage Operating Range
l
3
5.5
V
VL
Logic Supply Voltage Operating Range
VL ≤ VCC
l
1.7
VCC
V
VCC Supply Current in Shutdown Mode
SHDN = 0V
l
8
30
µA
VCC Supply Current in RS232 Mode or
RS485 Mode, Driver and Receiver Enabled,
Termination Disabled
No Load, SHDN = TE485 = DE485/F232 = VL
RE485 = 0
l
4
9
mA
VCC Supply Current in RS485 Mode with
Receiver and Termination Enabled, Driver
Disabled
No Load, SHDN = 485/232 = VL
DE485/F232 = RE485 = TE485 = 0
l
4
9
mA
VL Supply Current in Any Mode
No Load
l
0
5
µA
Power Supply Generator
VDD
Regulated VDD Output Voltage
SHDN = VL, No Load
7.0
V
VEE
Regulated VEE Output Voltage
SHDN = VL, No Load
6.3
V
RS485 Driver
|VOD|
Differential Output Voltage
RL = Open, VCC = 3V (Figure 1)
RL = 27Ω, VCC = 4.5V (Figure 1)
RL = 27Ω, VCC = 3V (Figure 1)
RL = 50Ω, VCC = 3.13V (Figure 1)
l
l
l
l
2.1
1.5
2
VCC
VCC
VCC
V
V
V
V
∆|VOD|
Difference in Magnitude of Differential Output
Voltage for Complementary Output States
RL = 27Ω, VCC = 3V (Figure 1)
RL = 50Ω, VCC = 3.13V (Figure 1)
l
l
0.2
0.2
V
VOC
Common Mode Output Voltage
RL = 27Ω or 50Ω (Figure 1)
l
3
V
∆|VOC|
Difference in Magnitude of Common Mode Output
Voltage for Complementary Output States
RL = 27Ω or 50Ω (Figure 1)
l
0.2
V
IOSD485
Maximum Short-Circuit Current
–7V ≤ VOUT ≤ 12V (Figure 2)
l
±250
mA
RS485 Receiver
IIN485
Input Current (A/DO, B/RI)
(A/DO or B/RI) = 12V or –7V,
VCC = 0V or 3.3V (Figure 3)
l
–100
125
µA
RIN485
Input Resistance (A/DO, B/RI)
(A/DO or B/RI) = 12V or –7V,
VCC = 0V or 3.3V (Figure 3)
125
Differential Input Signal Threshold
Voltage (A/DO to B/RI)
–7V ≤ (A/DO or B/RI) ≤ 12V
l
±200
mV
Input Hysteresis
B = 0V
220
mV
Differential Input Failsafe Rising Threshold Voltage –7V ≤ (A/DO or B/RI) ≤ 12V, (A/D0 – B/RI) Rising l
–200
–70
–20
mV
Input DC Failsafe Hysteresis
40
mV
VOL
Receiver Output Low Voltage
Output Low, I(RO) = 3mA (Sinking),
3V ≤ VL ≤ 5.5V
l
0.4
V
Output Low, I(RO) = 1mA (Sinking),
1.7V ≤ VL < 3V
l
0.4
V
ELECTRICAL CHARACTERISTICS


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