LTC491C 查看數據表（PDF） - Linear Technology
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LTC491C Datasheet PDF : 12 Pages
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LTC491
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage (VCC) ............................................... 12V
Control Input Voltages .................... –0.5V to VCC + 0.5V
Control Input Currents .......................... –50mA to 50mA
Driver Input Voltages ...................... –0.5V to VCC + 0.5V
Driver Input Currents ............................ –25mA to 25mA
Driver Output Voltages .......................................... ±14V
Receiver Input Voltages ......................................... ±14V
Receiver Output Voltages ............... –0.5V to VCC + 0.5V
Operating Temperature Range
LTC491C ................................................. 0°C to 70°C
LTC491I .............................................. – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
NC 1
R2
R
REB 3
DE 4
D5
D
GND 6
GND 7
14 VCC
13 NC
12 A
11 B
10 Z
9Y
8 NC
N PACKAGE
14-LEAD PDIP
S PACKAGE
14-LEAD PLASTIC SO
TJMAX = 100°C, θJA = 90°C/W (N)
TJMAX = 100°C, θJA = 110°C/W (S)
ORDER PART
NUMBER
LTC491CN
LTC491CS
LTC491IN
LTC491IS
Consult LTC Marketing for parts specified with wider operating temperature ranges.
DC ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 5V ±5%
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
VOD1
Differential Driver Output Voltage (Unloaded)
IO = 0
q
5
V
VOD2
Differential Driver Output Voltage (With load)
R = 50Ω; (RS422)
R = 27Ω; (RS485) (Figure 1)
q2
q 1.5
V
5
V
∆VOD
Change in Magnitude of Driver Differential Output
R = 27Ω or R = 50Ω (Figure 1)
q
Voltage for Complementary Output States
0.2
V
VOC
Driver Common Mode Output Voltage
q
3
V
∆ VOC Change in Magnitude of Driver Common Mode
Output Voltage for Complementary Output States
q
0.2
V
VIH
Input High Voltage
D, DE, REB
q 2.0
V
VIL
Input Low Voltage
q
0.8
V
lIN1
Input Current
lIN2
Input Current (A, B)
q
VCC = 0V or 5.25V VIN = 12V
q
±2
µA
1.0
mA
VIN = –7V
q
– 0.8
mA
VTH
Differential Input Threshold Voltage for Receiver
∆VTH
Receiver Input Hysteresis
– 7V ≤ VCM ≤12V
VCM = 0V
q – 0.2
0.2
V
q
70
mV
VOH
Receiver Output High Voltage
IO = –4mA, VID = 0.2V
q 3.5
V
VOL
Receiver Output Low Voltage
IOZR
Three-State Output Current at Receiver
IO = 4mA, VID = –0.2V
q
VCC = Max 0.4V ≤ VO ≤ 2.4V
q
0.4
V
±1
µA
ICC
Supply Current
No Load; D = GND, Outputs Enabled q
or VCC
Outputs Disabled q
300 500
µA
300 500
µA
RIN
Receiver Input Resistance
– 7V ≤ VCM ≤ 12V
q 12
kΩ
IOSD1
Driver Short Circuit Current, VOUT = High
VO = – 7V
q
100 250
mA
IOSD2
Driver Short Circuit Current, VOUT = Low
VO = 12V
q
100 250
mA
IOSR
Receiver Short Circuit Current
IOZ
Driver Three-State Output Current
0V ≤ VO ≤ VCC
VO = – 7V to 12V
q7
85
mA
q
±2 ±200
µA
491fa
2
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