LTM2881Y-3(RevA) Ver la hoja de datos (PDF) - Linear Technology

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LTM2881Y-3
(Rev.:RevA)

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

IINL

Logic Input Current

l

0

±1

µA

VHYS

Logic Input Hysteresis

(Note 2)

150

mV

VOH

Output High Voltage

VOL

Output Low Voltage

Output High, ILOAD = –4mA

(Sourcing), 5.5V ≥ VL ≥ 3V

Output High, ILOAD = –1mA

(Sourcing), 1.62V ≤ VL < 3V

Output Low, ILO AD = 4mA

(Sinking), 5.5V ≥ VL ≥ 3V

Output High, ILOAD = 1mA

(Sinking), 1.62V ≤ VL < 3V

l VL –0.4

l VL –0.4

l

l

V

V

0.4

V

0.4

V

IOZR

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

l

on RO

±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

tPLHD

tPHLD

Driver Input to Output

∆tPD

Driver Input to Output Difference

|tPLHD – tPHLD|

tSKEWD

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)

20

Mbps

l

60

85

ns

l

1

8

ns

l

1

±8

ns

tRD

Driver Rise or Fall Time

tFD

tZLD, tZHD,

tLZD, tHZD

Driver Output Enable or Disable 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

tFD

tZLD, tZHD,

tLZD, tHZD

Driver Rise or Fall Time

Driver Output Enable or Disable Time

RDIFF = 54Ω, CL = 100pF

(Figure 4)

RL = 500Ω, CL = 50pF

(Figure 5)

l

0.9

1.5

µs

l

400

ns

2881fa



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