LTM2881(RevA) 查看數據表（PDF） - Linear Technology
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LTM2881 Datasheet PDF : 22 Pages
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LTM2881
Electrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. LTM2881-3 VCC = 3.3V, LTM2881-5 VCC = 5.0V, VL = 3.3V, GND = GND2 =
0V, ON = VL unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Power Supply
VCC
VCC Supply Voltage
LTM2881-3
LTM2881-5
l 3.0
3.3
3.6
V
l 4.5
5.0
5.5
V
VL
ICCPOFF
VL Supply Voltage
VCC Supply Current in Off Mode
ON = 0V
l 1.62
5.5
V
l
0
10
µA
ICCS
VCC Supply Current in On Mode
LTM2881-3 DE = 0V, RE = VL, No Load
l
LTM2881-5 DE = 0V, RE = VL, No Load
l
20
25
mA
15
19
mA
VCC2
Regulated VCC2 Output Voltage, Loaded
LTM2881-3 DE = 0V, RE = VL, ILOAD = 100mA l 4.7
5.0
V
LTM2881-5 DE = 0V, RE = VL, ILOAD = 150mA
4.7
5.0
V
VCC2NOLOAD Regulated VCC2 Output Voltage, No Load
DE = 0V, RE = VL, No Load
4.8
5.0 5.35
V
Efficiency
ICC2 = 100mA, LTM2881-5 (Note 2)
62
%
ICC2S
Driver
VCC2 Short-Circuit Current
DE = 0V, RE = VL, VCC2 = 0V
l
250
mA
|VOD|
Differential Driver Output Voltage
R = ∞ (Figure 1)
R = 27Ω (RS485) (Figure 1)
R = 50Ω (RS422) (Figure 1)
l
l 1.5
l
2
VCC2
V
VCC2
V
VCC2
V
∆|VOD|
Difference in Magnitude of Driver Differential R = 27Ω or R = 50Ω (Figure 1)
l
Output Voltage for Complementary Output
States
0.2
V
VOC
Driver Common Mode Output Voltage
R = 27Ω or R = 50Ω (Figure 1)
l
3
V
∆|VOC|
Difference in Magnitude of Driver
R = 27Ω or R = 50Ω (Figure 1)
l
Common Mode Output Voltage for
Complementary Output States
0.2
V
IOZD
Driver Three-State (High Impedance) Output DE = 0V, (Y or Z) = –7V, +12V
l
Current on Y and Z
±10
µA
IOSD
Maximum Driver Short-Circuit Current
– 7V ≤ (Y or Z) ≤ 12V (Figure 2)
l – 250
250
mA
Receiver
RIN
Receiver Input Resistance
RE = 0V or VL, VIN = –7V, –3V, 3V, 7V,
l 96
125
kΩ
12V (Figure 3)
RTE
Receiver Termination Resistance Enabled
TE = VL, VAB = 2V, VB = – 7V, 0V, 10V
l 108
120
156
Ω
(Figure 8)
IIN
Receiver Input Current (A, B)
ON = 0V VCC2 = 0V or 5V, VIN = 12V
l
(Figure 3)
125
µA
ON = 0V VCC2 = 0V or 5V, VIN = –7V
l –100
µA
(Figure 3)
VTH
Receiver Differential Input Threshold Voltage –7V ≤ B ≤ 12V
(A-B)
l –0.2
0.2
V
∆VTH
Receiver Input Failsafe Hysteresis
B = 0V
25
mV
Receiver Input Failsafe Threshold
B = 0V
–0.2 –0.05
0
V
Logic
VIL
Logic Input Low Voltage
VIH
Logic Input High Voltage
1.62V ≤ VL ≤ 5.5V
DIN
SLO
DI, TE, DE, ON, RE:
VL ≥ 2.35V
1.62V ≤ VL < 2.35V
l
l 0.67•VCC2
l
2
l 0.67•VL
l 0.75•VL
0.4
V
V
V
V
V
2881fa
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