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SP485 Datasheet(PDF) 4 Page - Sipex Corporation

Part No. SP485
Description  Low Power Half-Duplex RS-485 Transceivers
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Maker  SIPEX [Sipex Corporation]
Homepage  http://www.sipex.com
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 4 page
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4
Rev. 07/16/02
SP481/483/485 Low Power Half-Duplex RS485 Transceivers
© Copyright 2002 Sipex Corporation
PIN FUNCTION
Pin#
Name
Description
1
RO
Receiver Output.
2
RE
Receiver Output Enable
Active LOW.
3
DE
Driver Output Enable
Active HIGH.
4
DI
Driver Input.
5
GND
Ground Connection.
6
A
Driver Output/Receiver Input
Non-inverting.
7
B
Driver Output/Receiver Input
Inverting.
8
Vcc
Positive Supply 4.75V<Vcc< 5.25V.
SP481, SP483, SP485
Pinout (Top View)
RO 1
RE 2
DE 3
DI 4
8 VCC
7 B
6 A
5 GND
D
R
SP485
Top View
SP483 AC SPECIFICATIONS
T
MIN to TMAX and VCC = 5V ± 5% unless otherwise noted.
PARAMETERS
MIN.
TYP.
MAX.
UNITS
CONDITIONS
SP483 DRIVER
AC Characteristics
Maximum Data Rate
250
kbps
Driver Input to Output
250
800
2000
ns
t
PLH; RDIFF = 54Ω, CL1 = CL2
= 100pF;
see figures 3 & 6
Driver Skew
250
800
2000
ns
t
PHL; RDIFF = 54Ω, CL1 = CL2
= 100pF;
see figures 3 & 6
Driver Rise and Fall Time
100
800
ns
see figures 3 & 6,
t
SKEW = |tDPLH - tDPHL|
250
2000
ns
From 10% to 90%; R
DIFF = 54Ω,
C
L1 = CL2 = 100pF, see figures 3 & 6
Driver Enable to Output High
250
2000
ns
C
L = 100pF; See figures 4 & 7; S2 closed
Driver Enable to Output Low
250
2000
ns
C
L = 100pF; See figures 4 & 7; S1 closed
Driver Disable Time from Low
300
3000
ns
C
L = 15pF; See figures 4 & 7; S1 closed
Driver Disable Time from High
300
3000
ns
C
L = 15pF; See figures 4 & 7; S2 closed
SP483 RECEIVER
AC Characteristics
Maximum Data Rate
250
kbps
Receiver Input to Output
250
2000
ns
t
PLH; RDIFF = 54Ω, CL1 = CL2 = 100pF;
Figures 3 & 8
Diff. Receiver Skew It
PLH-tPHLI
100
ns
R
DIFF = 54Ω, CL1 = CL2 = 100pF;
Figures 3 & 8
Receiver Enable to
Output Low
20
50
ns
C
RL = 15pF; Figures 2 & 9; S1 closed
Receiver Enable to
Output High
20
50
ns
C
RL = 15pF; Figures 2 & 9; S2 closed
Receiver Disable from Low
20
50
ns
C
RL = 15pF; Figures 2 & 9; S1 closed
Receiver Disable from High
20
50
ns
C
RL = 15pF; Figures 2 & 9; S2 closed
SP483
Shutdown Timing
Time to Shutdown
50
200
600
ns
RE = 5V, DE = 0V
Driver Enable from Shutdown
to Output High
2000
ns
C
L = 100pF; See figures 4 & 7; S2 closed
Driver Enable from Shutdown
to Output Low
2000
ns
C
L = 100pF; See figures 4 & 7; S1 closed
Receiver Enable from
Shutdown to Output High
2500
ns
C
L = 15pF; See figures 4 & 7; S2 closed
Receiver Enable from
Shutdown to Output Low
2500
ns
C
L = 15pF; See figures 4 & 7; S1 closed




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