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PDF SP3496E Data sheet ( Hoja de datos )
| Número de pieza | SP3496E | |
| Descripción | (SP3495E - SP3497E) 3.3V High Speed RS-485/RS-422 Transceivers | |
| Fabricantes | Exar Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SP3496E (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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www.DataShMeAetY4U20.c0o9m
SP3495E-3497E
HIGH SPEED +3.3V RS-485/RS-422 TRANSCEIVERS WITH +/-15KV ESD PROTECTION AND
ADVANCED FAILSAFE
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
FIGURE 1. TYPICAL APPLICATION CIRCUIT
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
1 page  
SP3495E-3497E
www.DataShReEeVt4.U1..c0o.0m
HIGH SPEED +3.3V RS-485/RS-422 TRANSCEIVERS WITH +/-15KV ESD PROTECTION AND ADVANCED FAILSAFE
UNLESS OTHERWISE NOTED: VCC = +3.0V TO +3.6V WITH TA FROM -40OC TO +85OC. TYPICAL VALUES ARE AT
VCC = +3.3V AND 25OC.
SYMBOL
VIH
VIL
VHYS
IIN
PARAMETERS
Logic Input Thresholds (DI, DE, RE)
Driver Input Hysteresis
Logic Input Current (DI, DE and RE)
Driver AC Characteristics
freq Data Signaling Rate
tPLH Driver Propagation Delay (low to
High)
tPHL Driver Propagation Delay (High to
Low)
tR Driver Rise Time
tF Driver Fall time
|tPLH-tPHL|
tOZH
Differential Pulse Skew
Driver Enable to Output High
tOZL Driver Enable to Outut Low
tOHZ
Driver Disable from Output High
tOLZ Driver Disable from Output Low
tOZV Shutdown to Driver Output Valid
tSHDN
Time to Shutdown
RECEIVER DC CHARACTERISTICS
IIN Input Current (A, B pins)
VIH Receiver Differential Thresholds
VIL (VA - VB)
Receiver Input Hysteresis
VOH Receiver Output Voltage High
VOL Receiver Output Voltage Low
MIN.
2.0
-10
32
5
5
2.5
2.5
50
-290
-200
2.4
TYP.
100
11
11
4.5
4.5
-85
-125
25
MAX. UNITS
CONDITIONS
V Logic Input High
0.8 V Logic Input Low
mV TA = 25°C
10 uA IN = 0V
uA IN = Vcc
Mbps 1/tUI, Duty Cycle 40 to 60%
24 ns CL = 50pF, RL = 54Ω,
freq = 8MHz, Figures 6 and 7
24 ns CL = 50pF, RL = 54Ω,
freq = 8MHz, Figures 6 and 7
10 ns CL = 50pF, RL = 54Ω,
freq = 8MHz, Figures 6 and 7
10 ns CL = 50pF, RL = 54Ω,
freq = 8MHz, Figures 6 and 7
3 ns Figures 6 and 7
50 ns CL = 50pF, RL = 500Ω, Figures
8 and 9
50 ns CL = 50pF, RL = 500Ω, Figures
10 and 11
50 ns CL = 50pF, RL = 500Ω, Figures
8 and 9
50 ns CL = 50pF, RL = 500Ω, Figures
10 and 11
6 us CL = 50pF, RL = 500Ω
600 ns Note 2 and 3
500 uA DE = 0, Vcc = 0 or 3.3V
VA or VB = 12V, other input 0V
VA or VB = -7V, other input 0V
-40 mV -7V ≤ VCM ≤ 12V, rising
mV -7V ≤ VCM ≤ 12V, falling
mV VCM = 0V
V IOUT = -8mA, VID = 200mV
0.4 V IOUT = 8mA, VID = -200mV
5
5 Page 
www.DataShReEeVt4.U1..c0o.0m
SP3495E-3497E
HIGH SPEED +3.3V RS-485/RS-422 TRANSCEIVERS WITH +/-15KV ESD PROTECTION AND ADVANCED FAILSAFE
FIGURE 11. DRIVER ENABLE AND DISABLE TIMING DIAGRAM 2
DE
tZL, tZL(SHDN)
Vcc OUT
VOL
VOM = (VOL + Vcc)/2
Vcc/2
tLZ
Vcc
0
0.25V
FIGURE 12. RECEIVER PROPAGATION DELAY TEST CIRCUIT
A
VID B R
RE
OUT
CL
15pF
FIGURE 13. RECEIVER PROPAGATION DELAY TIMING DIAGRAM
A
B
OUT
1.5V
tPHL
+1V
tPLH
-1V
VOH
VOL
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet SP3496E.PDF ] | |
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