ISL81485 datasheet(4/11 Pages) INTERSIL

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Receiver Short-Circuit Current

IOSR

≤ VO ≤ VCC

Full

SWITCHING CHARACTERISTICS

Driver Input to Output Prop Delay

tPLH, tPHL RDIFF = 54Ω, CL = 100pF (Figure 2)

Full

Driver Prop Delay Skew

tSKEW

RDIFF = 54Ω, CL = 100pF (Figure 2)

Full

Driver Differential Rise or Fall Time

tR, tF

RDIFF = 54Ω, CL = 100pF (Figure 2)

Full

Driver Enable to Output High

tZH

CL = 50pF, SW = GND (Figure 3)

Full

Driver Enable to Output Low

tZL

CL = 50pF, SW = VCC (Figure 3)

Full

Matched Enable Switching

|tAZH - tBZL| or |tBZH - tAZL|

∆tEN

(Figure 3)

Full

Driver Disable from Output High

tHZ

CL = 50pF, SW = GND (Figure 3)

Full

Driver Disable from Output Low

tLZ

CL = 50pF, SW = VCC (Figure 3)

Full

Matched Disable Switching

|tAHZ - tBLZ| or |tBHZ - tALZ|

∆t

DIS

(Figure 3)

Full

Driver Maximum Data Rate

fMAXD

|VOD| ≥ 1.5V (Figure 4)

Full

Mbps

Receiver Input to Output Prop

Delay

tPLH, tPHL (Figure 5)

Full

Receiver Prop Delay Skew

| tPLH - tPHL |

tSKD

(Figure 5)

Full

Receiver Enable to Output High

tZH

CL = 15pF, SW = GND (Figure 6)

Full

Receiver Enable to Output Low

tZL

CL = 15pF, SW = VCC (Figure 6)

Full

Receiver Disable from Output High

tHZ

CL = 15pF, SW = GND (Figure 6)

Full

Receiver Disable from Output Low

tLZ

CL = 15pF, SW = VCC (Figure 6)

Full

Receiver Maximum Data Rate

fMAXR

CL = 15pF, VID ≥ 1.5V, RO tH and tL ≥ 20ns

Full

Mbps

NOTES:

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.

3. Supply current specification is valid for loaded drivers when DE = 0V.

4. Applies to peak current. See “Typical Performance Curves” for more information.

5. Devices meeting these limits are denoted as “1 unit load (UL)” transceivers. The RS-485 standard allows up to 32 Unit Loads on the bus, so a

1UL transceiver permits > 32 devices on the bus.

Test Circuits and Waveforms

FIGURE 1A. VOD AND VOC

FIGURE 1B. VOD WITH COMMON MODE LOAD

FIGURE 1. DC DRIVER TEST CIRCUITS

Electrical Specifications

Test Conditions: VCC = 4.5V to 5.5V; Unless Otherwise Specified. Typicals are at VCC = 5V, TA = 25oC,

Note 2 (Continued)

PARAMETER

SYMBOL

TEST CONDITIONS

TEMP

(oC)

MIN

TYP

MAX

UNITS

VCC

VOD

VOC

VCC

VOD

375

Ω

375

Ω

RD = 60Ω

VCM

-7V to +12V

ISL81485

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