LTM2881 查看數據表（PDF） - Linear Technology

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LTM2881

Complete Isolated RS485/RS422 µModule Transceiver + Power

Linear Technology 

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

Logic

VIL

Logic Input Low Voltage

1.62V ≤ VL ≤ 5.5V

VIH

DIN

Logic Input High Voltage

SLO

DI, TE, DE, ON, RE:

VL ≥ 2.35V

1.62V ≤ VL < 2.35V

IINL

Logic Input Current

VHYS

Logic Input Hysteresis

(Note 2)

VOH

Output High Voltage

Output High, ILOAD = –4mA

(Sourcing), 5.5V ≥ VL ≥ 3V

Output High, ILOAD = –1mA

(Sourcing), 1.62V ≤ VL < 3V

VOL

Output Low Voltage

Output Low, ILOAD = 4mA

(Sinking), 5.5V ≥ VL ≥ 3V

Output High, ILOAD = 1mA

(Sinking), 1.62V ≤ VL < 3V

IOZR

Three-State (High Impedance) RE = VL, 0V ≤ RO ≤ VL

Output Current on RO

l

l 0.67•VCC2

l

2

0.4

V

V

V

l 0.67•VL

V

l 0.75•VL

V

l

0 ±1

µA

150

mV

l VL –0.4

V

l VL –0.4

V

l

0.4

V

l

0.4

V

l

±1

µA

IOSR

Short-Circuit Current

0V ≤ (RO or DOUT) ≤ VL

l

±85

mA

switching 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

Driver SLO = VCC2

fMAX

Maximum Data Rate

(Note 3)

20

Mbps

tPLHD

tPHLD

Driver Input to Output

RDIFF = 54Ω, CL = 100pF

(Figure 4)

l

60 85

ns

∆tPD

Driver Input to Output Difference RDIFF = 54Ω, CL = 100pF

|tPLHD – tPHLD|

(Figure 4)

l

18

ns

tSKEWD

Driver Output Y to Output Z

RDIFF = 54Ω, CL = 100pF

(Figure 4)

l

1 ±8

ns

tRD

Driver Rise or Fall Time

tFD

tZLD, tZHD, Driver Output Enable or Disable

tLZD, tHZD Time

Driver SLO = GND2

RDIFF = 54Ω, CL = 100pF

(Figure 4)

RL = 500Ω, CL = 50pF

(Figure 5)

l

4 12.5

ns

l

170

ns

fMAX

tPLHD

tPHLD

∆tPD

tSKEWD

Maximum Data Rate

Driver Input to Output

Driver Input to Output Difference

|tPLHD – tPHLD|

Driver Output Y to Output Z

(Note 3)

RDIFF = 54Ω, CL = 100pF

(Figure 4)

RDIFF = 54Ω, CL = 100pF

(Figure 4)

RDIFF = 54Ω, CL = 100pF

(Figure 4)

250

kbps

1 1.55

µs

50 500

ns

±200 ±500

ns

tRD

Driver Rise or Fall Time

tFD

RDIFF = 54Ω, CL = 100pF

(Figure 4)

l

0.9 1.5

µs

2881fh

For more information www.linear.com/LTM2881

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