ISL8485, ISL8490, ISL8491

FN6046 Rev 10.02

Page 6 of 15

Oct 2, 2023

No-Load Supply Current, Note 8

ICC

ISL8490, ISL8491, DE, DI, RE = 0V or VCC

Full

-

500

565

µA

ISL8485, DI, RE = 0V or

VCC

DE = VCC

Full

-

700

900

µA

DE = 0V

Full

-

500

565

µA

Driver Short-Circuit Current,

VO = High or Low

IOSD1

DE = VCC, -7V ≤ VY or VZ ≤ 12V, Note 9

Full

35

-

250

mA

Receiver Short-Circuit Current

IOSR

0V ≤ VO ≤ VCC

Full

7

-

85

mA

SWITCHING CHARACTERISTICS (ISL8485, ISL8490, ISL8491)

Driver Input to Output Delay

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

Full

18

30

50

ns

Driver Output Skew

tSKEW

RDIFF = 54Ω, CL = 100pF, Figure 2

Full

-

2

10

ns

Driver Differential Rise or Fall Time

tR, tF

RDIFF = 54Ω, CL = 100pF, Figure 2

Full

3

11

25

ns

Driver Enable to Output High

tZH

CL = 100pF, SW = GND, Figure 3

Full

-

17

70

ns

Driver Enable to Output Low

tZL

CL = 100pF, SW = VCC, Figure 3

Full

-

14

70

ns

Driver Disable from Output High

tHZ

CL = 15pF, SW = GND, Figure 3

Full

-

19

70

ns

Driver Disable from Output Low

tLZ

CL = 15pF, SW = VCC, Figure 3

Full

-

13

70

ns

Receiver Input to Output Delay

tPLH, tPHL Figure 4

Full

30

40

150

ns

Receiver Skew | tPLH - tPHL |tSKD

Figure 4

25

-

5

-

ns

Receiver Enable to Output High

tZH

CL = 15pF, SW = GND, Figure 5

Full

-

9

50

ns

Receiver Enable to Output Low

tZL

CL = 15pF, SW = VCC, Figure 5

Full

-

9

50

ns

Receiver Disable from Output High

tHZ

CL = 15pF, SW = GND, Figure 5

Full

-

9

50

ns

Receiver Disable from Output Low

tLZ

CL = 15pF, SW = VCC, Figure 5

Full

-

9

50

ns

Maximum Data Rate

fMAX

Note 11

Full

5

-

-

Mbps

NOTES:

7. 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.

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

9. Applies to peak current. See “Typical Performance Curves” on page 10 for more information.

10. Devices meeting these limits are denoted as “single unit load (1 UL)” transceivers. The RS-485 standard allows up to 32 unit loads on the bus.

11. Ensured by characterization, but not tested.

Electrical Specifications Test Conditions: VCC = 4.5V to 5.5V; unless otherwise specified. Typical values are at VCC = 5V,

TA = +25°C, Note 7 (Continued)

PARAMETER

SYMBOL

TEST CONDITIONS

TEMP

(°C)

MIN

TYP

MAX

UNIT