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LTC1321 数据表(PDF) 3 Page - Linear Technology

部件名 LTC1321
功能描述  RS232/EIA562/RS485 Transceivers
PDF  20 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC1321 数据表(HTML) 3 Page - Linear Technology

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LTC1321/LTC1322/LTC1335
DC ELECTRICAL CHARACTERISTICS
VCC = VDD (LTC1321/LTC1322) = 5V ±5%, VEE = –5V ±5% (Notes 2, 3)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
RS485 Driver (SEL1 = SEL2 = HIGH)
VOD1
Differential Driver Output Voltage (Unloaded)
IO = 0
q
5V
VOD2
Differential Driver Output Voltage (With Load)
Figure 1, R = 50
Ω (RS422)
q
2.0
5
V
Figure 1, R = 27
Ω (RS485)
q
1.5
5
V
∆VOD
Change in Magnitude of Driver Differential
Figure 1, R = 27
Ω or R = 50Ω
q
0.2
V
Output Voltage for Complementary Output States
VOC
Driver Common-Mode Output Voltage
Figure 1, R = 27
Ω or R = 50Ω
q
3V
∆VOC
Change in Magnitude of Driver Common-Mode
Figure 1, R = 27
Ω or R = 50Ω
q
0.2
V
Output Voltage for Complementary Output States
IOSD
Driver Short-Circuit Current
– 7V
≤ VO ≤ 12V, VO = HIGH
q
35
250
mA
– 7V
≤ VO ≤ 12V, VO = LOW (Note 4)
q
10
250
mA
IOZD
Three-State Output Current (Y, Z)
– 7V
≤ VO ≤ 12V
q
±5
±500
µA
EIA/TIA-562 Driver (SEL1 = SEL2 = LOW)
VO
Output Voltage Swing
Figure 4, RL = 3k, Positve
q
3.7
4.2
V
Figure 4, RL = 3k, Negative
q
– 3.7
– 4.3
V
IOSD
Output Short-Circuit Current
VO = 0V
q
±11
±60
mA
Driver Inputs and Control Inputs
VIH
Input High Voltage
D, DE, ON/OFF, SEL1, SEL2, LB
q
2V
OE (LTC1335)
q
2V
VIL
Input Low Voltage
D, DE, ON/OFF, SEL1, SEL2, LB
q
0.8
V
OE (LTC1335)
q
0.8
V
IIN
Input Current
D, SEL1, SEL2
q
±10
µA
DE, ON/OFF, LB
q
–4
– 15
µA
OE (LTC1335)
q
4
15
µA
RS485 Receiver (SEL1 = SEL2 = HIGH)
VTH
Differential Input Threshold Voltage
– 7V
≤ VCM ≤ 7V, Commercial
q
– 0.2
0.2
V
– 7V
≤ VCM ≤ 7V, Industrial
q
– 0.3
0.3
V
∆VTH
Input Hysteresis
VCM = 0V
q
70
mV
IIN
Input Current (A, B)
– 7V
≤ VIN ≤ 12V
q
±1mA
RIN
Input Resistance
– 7V
≤ VIN ≤ 12V
q
12
24
k
Ω
EIA/TIA-562 Receiver (SEL1 = SEL2 = LOW)
VTH
Receiver Input Voltage Threshold
Input Low Threshold
q
0.8
1.1
V
Input High Threshold
q
1.7
2.4
V
∆VTH
Receiver Input Hysteresis
q
0.1
0.6
1.0
V
RIN
Receiver Input Resistance
VIN = ±10V
3
5
7
k
Ω
Receiver Output
VOH
Receiver Output High Voltage
IO = – 3mA, VIN = 0V, SEL1 = SEL2 = LOW
q
3.5
4.6
V
VOL
Receiver Output Low Voltage
IO = 3mA, VIN = 3V, SEL1 = SEL2 = LOW
q
0.2
0.4
V
IOSR
Short-Circuit Current
0V
≤ VO ≤ VCC
q
785
mA
IOZR
Three-State Output Current
ON/OFF = 0V
q
±10
µA
OE = VCC (LTC1335)
q
±10
µA



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