HIGH SPEED +3.3V RS-485/RS-422 TRANSCEIVERS WITH +/-15KV ESD PROTECTION AND
ADVANCED FAILSAFE
MAY 2009
REV. 1.0.0
GENERAL DESCRIPTION
The
SP3495E - SP3497E
transceivers are suitable
for high speed bidirectional communication on
multipoint bus transmission lines. They are designed
for balanced data transmission and comply with both
RS-485 and RS-422 EIA standards. Each device
contains one differential driver and one differential
receiver
Driver differential outputs and receiver differential
inputs are connected internally to form a half-duplex
input/output to the RS-485 bus. Separate RE and DE
pins enable and disable the driver and receiver
independently or may be externally connected
together as a direct control. The device enters a low
power shutdown mode if both driver and receiver are
disabled. the bus-pin outputs of disabled or powered
down devices are in high impedance state. The high
impedance driver output is maintained over the entire
common-mode voltage range of -7V to +12V.
SP3495E - SP3497E operates from a single 3.3V
power supply. SP3495E - SP3497E transceivers load
the data bus only half as much as a standard RS-485
unit load. This allows up to 64 devices to be
connected simultaneously on a bus without violating
required RS-485 signal margin and without using
repeaters. Excessive power dissipation caused by
bus contention or by shorting outputs to ground or a
voltage source is prevented by short circuit protection
and thermal shutdown. This feature forces the driver
output into high impedance state if the absolute value
of the output current exceeds 250mA or if junction
temperature exceeds 165°C. Receivers will fail-safe
to a logic high output state if the inputs are
unconnected (floating) or shorted. All RS-485 inputs
F
IGURE
1. T
YPICAL
A
PPLICATION
C
IRCUIT
and outputs are ESD protected up to +/-15kV Human
Body Model.
FEATURES
•
3.3V Single Supply Operation
•
High Speed up to 32Mbps
•
Robust +/-15kV ESD protection
•
Hot Swap glitch protection
•
Advanced Fail-safe Receiver Inputs
•
Half Unit Load, 64 Transceivers on bus
•
Driver short circuit current limit and thermal
shutdown for overload protection
•
Low Current 1uA shutdown mode
TYPICAL APPLICATIONS
•
Factory Automation Controls
•
Motor Control
•
Industrial Process Control
•
Building Automation
•
Security Systems
•
Remote Utility Meter Reading
•
Long or un-terminated transmission lines
Exar
Corporation 48720 Kato Road, Fremont CA, 94538
•
(510) 668-7000
•
FAX (510) 668-7017
•
www.exar.com
SP3495E-3497E
HIGH SPEED +3.3V RS-485/RS-422 TRANSCEIVERS WITH +/-15KV ESD PROTECTION AND ADVANCED FAILSAFE
REV. 1.0.0
F
IGURE
2. P
IN
O
UT
A
SSIGNMENT
SP3495E 8-Pin Half Duplex
8 V
CC
7 B
6 A
D
5
GND
RO
1
2
R
RE
DE 3
4
DI
SP3496E 8-pin Full Duplex
Vcc
R
1
2
R
8 A
7
B
6
D
Z
D
GND
3
4
5 Y
SP3497E 14-pin Full Duplex
NC
R
1
2
14
13
12
11
10
D
9
8
Vcc
NC
A
B
R
RE 3
4
DE
D 5
6
GND
7
GND
Z
Y
NC
ORDERING INFORMATION
P
ART
N
UMBER
SP3495EEN-L
SP3495EEN-L/TR
SP3496EEN-L
SP3496EEN-L/TR
SP3497EEN-L
SP3497EEN-L/TR
P
ACKAGE
8-pin Narrow SOIC
8-pin Narrow SOIC
8-pin Narrow SOIC
8-pin Narrow SOIC
14-pin Narrow SOIC
14-pin Narrow SOIC
O
PERATING
T
EMPERATURE
R
ANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
D
EVICE
S
TATUS
Active
Active
Active
Active
Active
Active
Note: To order Tape and Reel option include "/TR" in ordering part number. All packages are Pb-free/ RoHS compliant.
2
SP3495E-3497E
REV. 1.0.0
HIGH SPEED +3.3V RS-485/RS-422 TRANSCEIVERS WITH +/-15KV ESD PROTECTION AND ADVANCED FAILSAFE
PIN DESCRIPTIONS
Pin Assignments
P
IN
N
UMBER
P
IN
N
AME
T
YPE
D
ESCRIPTION
H
ALF
D
UPLEX
SP3495E
1
F
ULL
D
UPLEX
SP3496E
2
SP3497E
2
RO
O
Receiver Output. When RE is low and if (A-
B)
≥
-40mV, RO is High. If (A-B)
≤
-200mV,
RO is Low.
Receiver Output Enable, When RE is Low,
RO is enabled. When RE is High, RO is
high impedance. RE should be High and
DE should be low to enter shutdown mode.
RE is a hot-swap input.
Driver Output Enable. When DE is High,
outputs are enabled. When DE is low, out-
puts are high impedance. DE should be low
and RE should be High to enter shutdown
mode. DE is a hot-swap input
Driver Input. With DE high, a low level on DI
forces Non-Inverting output low and invert-
ing output high. Similarly, a high level on DI
forces Non-Inverting output High and Invert-
ing output Low.
Ground
Non-Inverting Receiver Input and Non-
Inverting Driver Output
Inverting Receiver Input and Inverting
Driver Output
+3.3V power supply input. Bypass with
0.1uF capacitor.
Non-Inverting Receiver Input
Inverting Reciever Input
Non-Inverting Driver Output
Inverting Driver Output
No Connect, not internally connected
2
-
3
RE
I
3
-
4
DE
I
4
3
5
DI
I
5
6
7
8
-
-
-
-
-
4
-
-
1
8
7
5
6
-
6, 7
-
-
14
12
11
9
10
1, 8, 13
GND
A
B
Vcc
A
B
Y
Z
NC
Pwr
O
O
Pwr
I
I
O
O
-
Pin type: I=Input, O=Output.
3
SP3495E-3497E
HIGH SPEED +3.3V RS-485/RS-422 TRANSCEIVERS WITH +/-15KV ESD PROTECTION AND ADVANCED FAILSAFE
REV. 1.0.0
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections to the
specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability and cause permanent
damage to the device.
V
CC
Input Voltage at control pins (RE, DE and DI)
Voltage Range on A and B pins
Storage Temperature Range
Power Dissipation
Maximum Junction Temperature 150°C
8-Pin SO
θ
JA
= 128.4°C/W
14-Pin SO
θ
JA
= 86°C/W
+6.0V
-0.5V to (V
CC
+ 0.3V)
-9V to +14V
-65°C to + 150°C
CAUTION:
ESD (Electrostatic Discharge) sensitive device. Permanent damage may occur on unconnected devices subject to high energy electrostatic fields. Unused
devices must be stored in conductive foam or shunts. Personnel should be properly grounded prior to handling this device. The protective foam should be
discharged to the destination socket before devices are removed.
ELECTRICAL CHARACTERISTICS
U
NLESS OTHERWISE NOTED
: V
CC
= +3.0V
TO
+3.6V
WITH
T
A FROM
-40
O
C
TO
+85
O
C. T
YPICAL VALUES ARE AT
V
CC
= +3.3V
AND
25
O
C.
S
YMBOL
P
ARAMETERS
M
IN
.
TYP.
M
AX
.
U
NITS
C
ONDITIONS
DRIVER DC CHARACTERISTICS
V
OD
Differential Driver Output
2.0
1.5
1.5
1.5
∆V
OD
Change in Magnitude of Differential
Output
-0.20
-0.20
-0.20
0.20
0.20
0.20
V
Vcc
V
No Load
R
L
= 100Ω (RS-422), Figure 3
R
L
= 54Ω (RS-485), Figure 3
V
CM
= -7V, Figure 4
V
CM
= +12V, Figure 4
R
L
= 100Ω (RS-422), Figure 3,
See note 1
R
L
= 54Ω (RS-485), Figure 3,
See note 1
V
CM
= -7V, Figure 4, See
note 1
-0.20
V
OC
∆V
OC
I
DSC
Driver Common Mode Output
Voltage steady state
Change in Magnitude of Common
Mode Output Voltage
Driver Short Circuit Current Limit
1.3
-0.2
-250
250
0.20
2.5
0.2
V
V
mA
mA
V
CM
= +12V, Figure 4, See note
1
Figure 3
Figure 3, See note 1
V
OUT
Forced to -7V, Figure 5
V
OUT
Forced to +12V, Figure 5
4
SP3495E-3497E
REV. 1.0.0
HIGH SPEED +3.3V RS-485/RS-422 TRANSCEIVERS WITH +/-15KV ESD PROTECTION AND ADVANCED FAILSAFE
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