DC ELECTRICAL CHARACTERISTICS The l
參數(shù)資料
型號(hào)： LT1791AIS#TRPBF
廠商： Linear Technology
文件頁數(shù)： 11/16頁
文件大?。?/td> 0K
描述： IC TXRX RS485/RS422 60V 14-SOIC
標(biāo)準(zhǔn)包裝： 2,500
類型： 收發(fā)器
驅(qū)動(dòng)器/接收器數(shù)： 1/1
規(guī)程： RS422，RS485
電源電壓： 4.75 V ~ 5.25 V
安裝類型： 表面貼裝
封裝/外殼： 14-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 14-SOIC
包裝： 帶卷 (TR)
LT1785/LT1785A/
LT1791/LT1791A
4
178591fc
DC ELECTRICAL CHARACTERISTICS The l denotes the specications which apply over the full operating
temperature range, otherwise specications are at TA = 25°C, VCC = 5V.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VOD1
Differential Driver Output Voltage (Unloaded)
IO = 0
l
4.1
5
V
VOD2
Differential Driver Output Voltage (With Load)
R = 50Ω (RS422), Figure 1
R = 27Ω (RS485), Figure 1
R = 18Ω
l
2.0
1.5
1.2
2.70
2.45
2.2
V
VOD
Change in Magnitude of Driver Differential Output
Voltage for Complementary Output States
R = 27Ω or R = 50Ω, Figure 1
l
0.2
V
VOC
Driver Common Mode Output Voltage
R = 27Ω or R = 50Ω, Figure 1
l
2
2.5
3
V
Δ|VOC|
Change in Magnitude of Driver Common Mode Output
Voltage for Complementary Output States
R = 27Ω or R = 50Ω, Figure 1
l
0.2
V
VIH
Input High Voltage
DI, DE, RE
l
2V
VIL
Input Low Voltage
DI, DE, RE
l
0.8
V
IIN1
Input Current
DI, DE, RE
l
5μA
IIN2
Input Current (A, B); (LT1791 or LT1785 with DE = 0V)
VIN = 12V
VIN = –7V
–60V ≤ VIN ≤ 60V
l
–0.15
–6
0.15
–0.08
0.3
6
mA
VTH
Differential Input Threshold Voltage for Receiver
LT1785/LT1791: –7V ≤ VCM ≤ 12V
LT1785A/LT1791A: –7V ≤ VCM ≤ 12V
l
–0.2
0.2
0
V
ΔVTH
Receiver Input Hysteresis
–7V < VCM < 12V
20
mV
VOH
Receiver Output High Voltage
IO = –400μA, VID = 200mV
l
3.5
4
V
VOL
Receiver Output Low Voltage
IO = 1.6mA, VID = –200mV
l
0.3
0.5
V
Three-State (High Impedance) Output Current at
Receiver 0V < VOUT < 6V
RE > 2V or Power Off
l
–1
1
μA
RIN
Receiver Input Resistance (LT1791)
–7V ≤ VCM ≤ 12V
– 60V ≤ VCM ≤ 60V
l
85
125
kΩ
LT1785
–7V ≤ VCM ≤ 12V
l
50
90
kΩ
RS485 Unit Load
0.25
ISC
Driver Short-Circuit Current
VOUT = HIGH, Force VO = –7V
VOUT = LOW, Force VO = 12V
l
35
250
mA
Driver Output Fault Current
VO = 60V
VO = –60V
l
–6
6mA
mA
Receiver Short-Circuit Current
0V ≤ VO ≤ VCC
l
±35
mA
Driver Three-State Output Current
–7V ≤ VO ≤ 12V
–60V ≤ VO ≤ 60V
l
–0.2
–6
0.3
6
mA
ICC
Supply Current
No Load, RE = 0V, DE = 5V
No Load, RE = 5V, DE = 5V
No Load, RE = 0V, DE = 0V
No Load, RE = 5V, DE = 0V
l
5.5
4.5
0.2
9
8
0.3
mA
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