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LTC2873H

Single-Bus RS485/RS232 Multiprotocol Transceiver with Switchable Termination

Analog Devices 

LTC2873

SWITCHING CHARACTERISTICS The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VCC = VL = 3.3V, TE485 = VL, LB = 0V unless otherwise noted. (Notes 2, 6)

SYMBOL

PARAMETER

CONDITIONS

MIN

tZLSR232, tZHSR232 Receiver Enable from Shutdown

Time (Note 7)

VDD = 7.0V, VEE = –6.3V, 485/232 = 0V,

l

RL = 1kΩ, CL = 150pF, SHDN ↑ (Figure 12)

tLZSR232, tHZSR232 Receiver Disable Into Shutdown Time 485/232 = 0V, RL = 1kΩ, CL = 150pF

l

SHDN ↓ (Figure 12)

Mode Change Characteristics

tRDY

VDD and VEE Supply Rise Time

(Figure 13)

l

(Time from Shutdown to RS485 Ready)

tDR232

Time from RS485 Mode to RS232 Mode (Figure 14)

l

RS232 Driver Ready

tR232

Time from RS485 Mode to RS232 Mode (Figure 14)

l

RS232 Receiver Ready

tDR485

Time from RS232 Mode to RS485 (Figure 14)

l

Mode RS485 Driver and Receiver Ready

TYP MAX

5

12

0.4

2

0.2

1

0.2

1

0.8

3

70

250

UNITS

µs

μs

ms

µs

µs

ns

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.

Note 3: Guaranteed by other measured parameters and not tested directly.

Note 4: Time from SHDN ↑ until VDD ≥ 5V and VEE ≤ –5V. External

components as shown in the Typical Application section.

Note 5: Guaranteed by design and not subject to production test.

Note 6:Testing was done with VDD and VEE back driven to valid supply

levels for functions that require these supplies, unless otherwise noted.

Note 7: If enabling from shutdown, where VDD and VEE supplies are

collapsed, allow the extra time it takes to generate valid VDD and VEE

supplies (tRDY).

REV B

6

For more information www.analog.com

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