Positive-going input

threshold voltage

V

IT+

-7V V

≦

CM

12V

≦

+200

mV

Negative-going input

threshold voltage

V

IT-

-7V V

≦

CM

12V

≦

-200

mV

Hysteresis voltage

V

hys

-7V V

≦

CM

12V

≦

10

30

mV

High level output voltage

V

OH

I

OUT = −2.5mA,

V

ID = +200 mV

VCC-1.5

V

Low level output voltage

V

OL

I

OUT = +2.5mA,

V

ID = -200 mV

0.4

V

Tristate leakage current

I

OZR

0.4V < V

O < 2.4V

±1

μMAX/VSSA

Receiver input resistance

R

IN

-7V V

≦

CM

12V

≦

96

kΩ

Receiver short-circuit

current

I

OSR

0V ≤ V

O ≤ VCC

±8

±60

mA

(unless otherwise stated VCC=3.3V±10%, Temp=TMIN~TMAX, typical value is VCC=+3.3V, Temp＝25°C)

Supply current

Driver switching characteristics

Parameter

Symbol

Test conditions

Min

Typ

Max

Unit

Driver differential

output delay

t

DD

R

DIFF = 60 Ω,

C

L1=CL2=100pF

(see Figure 3 and Figure 4)

10

35

ns

Driver differential

output transition time

t

TD

12

25

ns

Driver propagation

delay, low-to-high

t

PLH

R

DIFF = 27 Ω,

(see Figure 3 and Figure 4)

8

35

ns

Driver propagation

delay, high-to-low

t

PHL

8

35

ns

Parameter

Symbol

Test conditions

Min

Typ

Max

Unit

Supply current

I

CC1

/RE = 0V, DE = 0V

520

800

μMAX/VSSA

I

CC2

/RE = VCC, DE = VCC

540

700

μMAX/VSSA

www.umw-ic.com

4

友台半导体有限公司

ST3485E

3.3V power supply, up to 256 nodes, 12Mbps half-duplex,

RS485/RS422 transceiver

UMW R