LTC491 datasheet(4/18 Pages) LINER

4 / 18 page

LTC2859/LTC2861

285961fc

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: All currents into device pins are positive; all currents out of device

pins are negative. All voltages are referenced to device ground unless

otherwise specified.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Driver in Normal Mode (SLO HIGH)

fMAX

Maximum Data Rate

Note 3

Mbps

tPLHD, tPHLD

Driver Input to Output

RDIFF = 54Ω, CL = 100pF (Figure 3)

DtPD

Driver Input to Output Difference

|tPLHD-tPHLD|

RDIFF = 54Ω, CL = 100pF (Figure 3)

tSKEWD

Driver Output Y to Output Z

RDIFF = 54Ω, CL = 100pF (Figure 3)

±6

tRD, tFD

Driver Rise or Fall Time

RDIFF = 54Ω, CL = 100pF (Figure 3)

12.5

tZLD, tZHD, tLZD,

tHZD

Driver Enable or Disable Time

RL = 500Ω, CL = 50pF, RE = 0 (Figure 4)

tZHSD, tZLSD

Driver Enable from Shutdown

RL = 500Ω, CL = 50pF, RE = VCC (Figure 4)

µs

tSHDN

Time to Shutdown

(DE =

↓, RE = VCC) or (DE = 0, RE ↑)

(Figure 4)

100

Driver in SLO Mode (SLO LOW)

fMAXS

Maximum Data Rate

Note 3

250

kbps

tPLHDS, tPHLDS Driver Input to Output

RDIFF = 54Ω, CL = 100pF (Figure 3)

0.95

1.5

µs

DtPDS

Driver Input to Output Difference

|tPLHR-tPHLR|

RDIFF = 54Ω, CL = 100pF (Figure 3)

500

tSKEWDS

Driver Output A to Output B

RDIFF = 54Ω, CL = 100pF (Figure 3)

(H-Grade)

200

±500

±750

tRDS, tFDS

Driver Rise or Fall Time

RDIFF = 54Ω, CL = 100pF (Figure 3)

0.9

1.5

µs

tZHDS, tZLDS

Driver Enable Time

RL = 500Ω, CL = 50pF, RE = 0 (Figure 4)

300

tLZDS, tHZDS

Driver Disable Time

RL = 500Ω, CL = 50pF, RE = 0 (Figure 4)

tZHSDS, tZLSDS Driver Enable from Shutdown

RL = 500Ω, CL = 50pF, RE = VCC (Figure 4)

µs

tSHDNS

Time to Shutdown

(DE = 0, RE =

↑) or (DE = ↓, RE = VCC) (Figure 4)

500

Receiver

tPLHR, tPHLR

Receiver Input to Output

CL = 15pF, VCM = 1.5V, |VAB| = 1.5V, tR and tF <

4ns (Figure 5)

tSKEWR

Differential Receiver Skew

|tPLHR-tPHLR|

CL = 15pF (Figure 5)

tRR, tFR

Receiver Output Rise or Fall Time

CL = 15pF (Figure 5)

12.5

tZLR, tZHR, tLZR,

tHZR

Receiver Enable/Disable

RL = 1kΩ, CL =15pF, DE = VCC (Figure 6)

DI = 0 or VCC

tZHSR, tZLSR

Receiver Enable from Shutdown

RL = 1kΩ, CL = 15pF, DE = 0V (Figure 6)

DI = 0 or VCC

µs

tRTEN, tRTZ

Termination Enable or Disable Time

VB = 0V, VAB = 2V, RE = VCC, DE = 0V (Figure 7)

100

µs

The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C, VCC = 5V, TE = 0 unless otherwise noted (Note 2).

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

and is not tested directly.

Note 4: This IC 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 the specified maximum operating junction

temperature may result in device degradation or failure.

swiTchinG characTerisTics

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