SP3070E Datasheet, PDF (16/20 Pages) Exar Corporation – ±15kV ESD-Protected, 3.3V, 1/8 Load, Failsafe RS-485/RS422 Transceivers

Second, a thermal-shutdown circuit, forces
the driver outputs into a high-impedance
state if the die temperature becomes ex-
cessive.
line length
The RS-485/RS422 standard covers line
lengths up to 4000ft.
typical applications
The SP3072E, SP3075E and SP3078E
transceivers are designed for bidirectional
data communications on multipoint bus
transmission lines.
DETAILED DESCRIPTION
To minimize reflections, terminate the line at
both ends in its characteristic impedance,
and keep stub lengths off the main line as
short as possible. The slew-rate-limited
SP3070E - SP3075E are more tolerant of
imperfect termination.
Parts selector guide
PART
NUMBER
SP3070E
SP3071E
SP3072E
SP3073E
SP3074E
SP3075E
SP3076E
SP3077E
SP3078E
Half/Full
Duplex
Full
Full
Half
Full
Full
Half
Full
Full
Half
Datarate
Mbps
0.25
0.25
0.25
0.5
0.5
0.5
16
16
16
Shut-
Receiver
down Driver Enable
Yes
Yes
No
No
Yes
Yes
Yes
Yes
No
No
Yes
Yes
Yes
Yes
No
No
Yes
Yes
Trans.
Pin Industry Standard
On Bus Count
Pinout
256
14 MAX3070E, 75180
256
8 MAX 3071E, 75179
256
8 MAX 3072E, 75176
256
14 MAX 3073E, 75180
256
8 MAX 3074E, 75179
256
8 MAX 3075E, 75176
256
14 MAX 3076E, 75180
256
8 MAX3077E, 75179
256
8
MAX 3078E, 75176
Pin
Compatible
Upgrade from:
SP3493
SP3483
SP3494
SP3491
SP3490
SP3485,
SP3481
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
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SP3070E-SP3078E_100_061109