LTC2876 datasheet(4/32 Pages) LINER

4 / 32 page

LTC2876/LTC2877

28767fa

For more information www.linear.com/LTC2876

elecTrical characTerisTics The

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VCC = VL = 5V unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Driver

VOD(PP)

Differential Bus Output Voltage (B´–A´)

with PROFIBUS Load

PROFIBUS LOAD (Figure 1)

RCABLE = 0Ω, VCC = 4.5V to 5.5V

RCABLE = 5.5Ω, VCC = 4.5V to 5.5V

RCABLE = 11Ω, VCC = 4.75V to 5.5V

VP-P(DIFF)

VBPP-APP

Single-Ended Bus Output Amplitude

Difference (B´PP – A´PP)

All of the Conditions Above

0.5

VBPP+APP

Single-Ended Bus Output Amplitude

Sum |B´PP + A´PP|

All of the Conditions Above

|VOD(485)|

RS485 Differential Driver Output

Voltage, in Either Logic State

Figure 2 with No Load

VCC

RL = 27Ω,VCC = 4.5V to 5.5V (Figure 2)

1.5

3.4

RL = 27Ω,VCC = 3.0V to 3.6V (Figure 2)

0.8

1.8

|VOD(422)|

RS422 Differential Driver Output

Voltage, Either Logic State

Figure 2 with No Load

VCC

RL = 50Ω,VCC = 4.5V to 5.5V (Figure 2)

RL = 50Ω,VCC = 3.0V to 3.6V (Figure 2)

Δ|VOD(485)|,

Δ|VOD(422)|

RS485, RS422 Change in Magnitude of

Driver Differential Output Voltage

RL = 27Ω (RS485) or

RL = 50Ω (RS422) (Figure 2)

0.2

VOC(485),

VOC(422)

RS485, RS422 Driver Common-Mode

Output Voltage

RL = 27Ω (RS485) or

RL = 50Ω (RS422) (Figure 2)

Δ|VOC(485)|,

Δ|VOC(422)|

RS485, RS422 Change in Magnitude of

Driver Common-Mode Output Voltage

RL = 27Ω (RS485) or

RL = 50Ω (RS422) (Figure 2)

0.2

IOSD

Maximum Driver Short-Circuit Current

–60V ≤ (PB or PA) ≤ 60V (Figure 3)

±150

±250

Receiver

IIN

Input Current (PA, PB)

VCC = 0V or 5V, VBUS = 12V (Figure 4)

VCC = 0V or 5V, VBUS = –7V (Figure 4)

–100

160

µA

RIN

Input Resistance

VBUS = –25V or 25V (Figure 4)

112

135

kΩ

VCM

Common Mode Input Voltage

(PA+PB)/2 for Data Reception

±25

VTS+

Differential Input Signal Threshold

Voltage (PB–PA) Rising

–25V ≤ VCM ≤ 25V, Edge Rates > 100mV/µs

(Note 5) (Figure 13)

120

200

VTS–

Differential Input Signal Threshold

Voltage (PB–PA) Falling

–25V ≤ VCM ≤ 25V, Edge Rates > 100mV/µs

(Note 5) (Figure 13)

–50

–120

–200

ΔVTS

Differential Input Signal Hysteresis

Edge Rates > 100mV/µs (Note 5) (Figure 13)

240

VTFS+

Differential Input Failsafe Threshold

Voltage (PB–PA) Rising

–25V ≤ VCM ≤ 25V, DC Bus Voltages

(Figure 13)

–20

–75

–200

VTFS–

Differential Input Failsafe Threshold

Voltage (PB–PA) Falling

–25V ≤ VCM ≤ 25V, DC Bus Voltages

(Figure 13)

–50

–120

–200

ΔVTFS

Differential Input Failsafe Hysteresis

DC Bus Voltages (Figure 13)

VOH

Receiver Output High Voltage

VCC ≥ 4.5V, I(RO) = –3mA (LTC2876)

VL ≥ 2.25V, I(RO) = –3mA (LTC2877)

VL < 2.25V, I(RO) = –2mA (LTC2877)

VCC – 0.4V

VL – 0.4V

VOL

Receiver Output Low Voltage

VL ≥ 1.65V, I(RO) = 3mA (LTC2877)

VCC ≥ 3.0V, I(RO) = 3mA (LTC2876)

0.4

Receiver Three-State (High Impedance)

Output Current on RO

RE = High, RO = 0V

–20

–40

µA

Receiver Three-State (High Impedance)

Output Current on RO

RE = High, RO = VCC (LTC2876) or VL

(LTC2877)

µA

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