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LTM2881V-5

Complete Isolated RS485/RS422 µModule Transceiver + Power

Linear Technology 

LTM2881

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

tZLD, tZHD,

tLZD, tHZD

Receiver

Driver Output Enable or Disable

Time

RL = 500Ω, CL = 50pF

(Figure 5)

l

400

ns

tPLHR

tPHLR

tSKEWR

tRR

tFR

tZLR, tZHR,

tLZR, tHZR

tRTEN, tRTZ

Receiver Input to Output

Differential Receiver Skew

|tPLHR - tPHLR|

Receiver Output Rise or Fall Time

CL = 15pF, VCM = 2.5V, |VAB| = 1.4V,

tR and tF < 4ns, (Figure 6)

CL = 15pF

(Figure 6)

CL = 15pF

(Figure 6)

Receiver Output Enable Time

RL =1kΩ, CL = 15pF

(Figure 7)

Termination Enable or Disable

Time

RE = 0V, DE = 0V, VAB = 2V, VB = 0V (Figure 8)

l

100 140

ns

l

18

ns

l

3 12.5

ns

l

50

ns

l

100

µs

Generic Logic Input

tPLHL1

tPHLL1

DIN to DOUT Input to Output

Power Supply Generator

CL = 15pF,

tR and tF < 4ns

l

60 100

ns

VCC2–GND2 Supply Start-Up

Time

(0V to 4.5V)

ON VL, No Load

l

325 800

µs

isolation Characteristics TA = 25°C, LTM2881-3 VCC = 3.3V, LTM2881-5 VCC = 5.0V, VL = 3.3V unless

otherwise noted.

SYMBOL

VISO

VIORM

CTI

DTI

PARAMETER

Rated Dielectric Insulation Voltage

Common Mode Transient Immunity

Maximum Working Insulation Voltage

Partial Discharge

Comparative Tracking Index

Depth of Erosion

Distance Through Insulation

Input to Output Resistance

Input to Output Capacitance

Creepage Distance

CONDITIONS

MIN TYP MAX UNITS

1 Minute (Derived from 1 Second Test)

1 Second (Notes 5, 6)

2500

± 4400

VRMS

VDC

LTM2881-3 VCC = 3.3V, LTM2881-5 VCC = 5V,

±30

VL = ON = 3.3V, VCM = 1kV, ∆t = 33ns (Note 2)

(Notes 2, 5)

560

400

VPR = 1050 VPEAK (Note 2)

IEC 60112 (Note 2)

5

600

IEC 60112 (Note 2)

0.017

kV/µs

VPEAK

VRMS

pC

VRMS

mm

(Note 2)

(Notes 2, 5)

0.06

mm

109

Ω

(Notes 2, 5)

6

pF

(Notes 2, 5)

9.48

mm

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: Guaranteed by design and not subject to production test.

Note 3: Maximum Data rate is guaranteed by other measured parameters

and is not tested directly.

Note 4: This µModule transceiver includes overtemperature protection that

is intended to protect the device during momentary overload conditions.

Junction temperature will exceed 125°C when overtemperature protection

is active. Continuous operation above specified maximum operating

junction temperature may result in device degradation or failure.

Note 5: Device considered a 2-terminal device. Pin group A1 through B8

shorted together and pin group K1 through L8 shorted together.

Note 6: The rated dielectric insulation voltage should not be interpreted as

a continuous voltage rating.

2881fh

6

For more information www.linear.com/LTM2881

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