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SP490E

Enhanced Full Duplex RS-485 Transceivers

Signal Processing Technologies 

SPECIFICATIONS (continued)

T

MIN

to

T

MAX

and

V

CC

=

5V

±

5%

unless

otherwise

noted.

PARAMETERS

MIN.

SP491E RECEIVER

DC Characteristics

Differential Input Threshold -0.2

Input Hysteresis

Output Voltage HIGH

3.5

Output Voltage LOW

Three State (high impedance)

Output Current

Input Resistance

12

Input Current (A, B); VIN = 12V

Input Current (A, B); VIN = -7V

Short-Circuit Current

SP491E RECEIVER

AC Characteristics

Maximum Data Rate

10

Receiver Input to Output

20

Receiver Input to Output

20

Diff. Receiver Skew ItPLH-tPHLI

Receiver Enable to Output LOW

Receiver Enable to Output HIGH

Receiver Disable from LOW

Receiver Disable from HIGH

POWER REQUIREMENTS

Supply Voltage

Supply Current

+4.75

SP491E ENVIRONMENTAL

AND MECHANICAL

Operating Temperature

Commercial (_C_)

0

Industrial (_E_)

-40

Storage Temperature

-65

Package

Plastic DIP (_P)

NSOIC (_N)

TYP.

70

15

45

45

13

45

45

45

45

900

MAX. UNITS CONDITIONS

+0.2 Volts

mV

Volts

0.4 Volts

±1 µA

kΩ

±1.0 mA

-0.8 mA

85 mA

-7V ≤ VCM ≤ 12V

VCM = 0V

IO = -4mA, VID = +200mV

IO = +4mA, VID = -200mV

0.4V ≤ VO ≤ 2.4V; REB = 5V

-7V ≤ VCM ≤ 12V

DE = 0V, VCC = 0V or 5.25V, VIN = 12V

DE = 0V, VCC = 0V or 5.25V, VIN = -7V

0V ≤ VO ≤ VCC

Mbps

100 ns

100 ns

ns

70 ns

70 ns

70 ns

70 ns

+5.25 Volts

µA

REB = 0V, DE = 5V

tPLH; RDIFF = 54Ω,

CL1 = CL2 = 100pF; Figures 3 & 7

tCPLH1L;=RCDLIF2F==10504pΩF,; Figures 3 & 7

RDIFF = 54Ω; CL1 = CL2 = 100pF;

Figures 3 & 7

CRL = 15pF; Figures 2 and 8; S1 closed

CRL = 15pF; Figures 2 and 8; S2 closed

CRL = 15pF; Figures 2 and 8; S1 closed

CRL = 15pF; Figures 2 and 8; S2 closed

REB, D = 0V or VCC; DE = VCC

+70 °C

+85 °C

+150 °C

+3V

RE

0V

5V

R

VIL

VIH

R

0V

1.5V f = 1MHz; tR < 10ns; tF < 10ns

tZL

1.5V Output normally LOW

1.5V Output normally HIGH

tZH

Figure 8. Receiver Enable and Disable Times

1.5V

tLZ

0.5V

0.5V

tHZ

SP490EDS/14

SP490E Enhanced Full Duplex RS-485 Transceivers

6

© Copyright 2000 Sipex Corporation

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