LTM2881

4

2881fi

For more information www.linear.com/LTM2881

elecTrical characTerisTics

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Power Supply

VCC

VCC Supply Voltage

LTM2881-3

LTM2881-5

l

l

3.0

4.5

3.3

5.0

3.6

5.5

V

V

VL

VL Supply Voltage

l

1.62

5.5

V

ICCPOFF

VCC Supply Current in Off Mode

ON = 0V

l

0

10

µA

ICCS

VCC Supply Current in On Mode

LTM2881-3 DE = 0V, RE = VL, No Load

LTM2881-5 DE = 0V, RE = VL, No Load

l

l

20

15

30

25

mA

mA

VCC2

Regulated VCC2 Output Voltage,

Loaded

LTM2881-3 DE = 0V, RE = VL, ILOAD = 100mA

LTM2881-5 DE = 0V, RE = VL, ILOAD = 150mA

LTM2881-3, H/MP-Grade, ILOAD = 90mA

l

l

l

4.75

4.75

4.75

5.0

5.0

V

V

V

VCC2NOLOAD Regulated VCC2 Output Voltage,

No Load

DE = 0V, RE = VL, No Load

4.8

5.0

5.35

V

Efficiency

ICC2 = 100mA, LTM2881-5 (Note 2)

62

%

ICC2S

VCC2 Short-Circuit Current

DE = 0V, RE = VL, VCC2 = 0V

200

mA

Driver

|VOD|

Differential Driver Output Voltage R = ∞ (Figure 1)

R = 27Ω (RS485) (Figure 1)

R = 50Ω (RS422) (Figure 1)

l

l

l

2.1

2.1

VCC2

VCC2

VCC2

V

V

V

∆|VOD|

Difference in Magnitude of Driver

Differential Output Voltage for

Complementary Output States

R = 27Ω or R = 50Ω (Figure 1)

l

0.2

V

VOC

Driver Common Mode Output

Voltage

R = 27Ω or R = 50Ω (Figure 1)

l

3

V

∆|VOC|

Difference in Magnitude of Driver

Common Mode Output Voltage

for Complementary Output States

R = 27Ω or R = 50Ω (Figure 1)

l

0.2

V

IOZD

Driver Three-State (High

Impedance) Output Current on

Y and Z

DE = 0V, (Y or Z) = –7V, +12V

DE = 0V, (Y or Z) = –7V, +12V, H/MP-Grade

l

l

±10

±50

µA

µA

IOSD

Maximum Driver Short-Circuit

Current

–7V ≤ (Y or Z) ≤ 12V (Figure 2)

l

– 250

250

mA

Receiver

RIN

Receiver Input Resistance

RE = 0V or VL, VIN = –7V, –3V, 3V, 7V, 12V (Figure 3)

RE = 0V or VL, VIN = –7V, –3V, 3V, 7V, 12V (Figure 3),

H/MP-Grade

l

l

96

48

125

125

kΩ

kΩ

RTE

Receiver Termination Resistance

Enabled

TE = VL, VAB = 2V, VB = –7V, 0V, 10V (Figure 8)

l

108

120

156

Ω

IIN

Receiver Input Current (A, B)

ON = 0V VCC2 = 0V or 5V, VIN = 12V (Figure 3)

ON = 0V VCC2 = 0V or 5V, VIN = 12V (Figure 3), H/MP-Grade

l

l

125

250

µA

ON = 0V VCC2 = 0V or 5V, VIN = –7V (Figure 3)

ON = 0V VCC2 = 0V or 5V, VIN = –7V (Figure 3), H/MP-Grade

l

l

–100

–145

µA

VTH

Receiver Differential Input

Threshold Voltage (A-B)

–7V ≤ B ≤ 12V

l

–0.2

0.2

V

∆VTH

Receiver Input Failsafe Hysteresis B = 0V

25

mV

Receiver Input Failsafe Threshold B = 0V

–0.2

–0.05

0

V

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.