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PDF ISL32173E Data sheet ( Hoja de datos )
| Número de pieza | ISL32173E | |
| Descripción | (ISL32173E - ISL32277E) RS-485/RS-422 Receivers | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ISL32173E (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
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QUAD, ±16.5kV ESD Protected, 3.0V to 5.5V,
RS-485/RS-422 Receivers
ISL32173E, ISL32175E, ISL32177E, ISL32273E, ISL32275E,
ISL32277E
These Intersil devices are ±16.5kV IEC61000-4-2 ESD
protected, 3.0V to 5.5V powered, QUAD receivers for
balanced communication using the RS-485 and RS-422
standards. Each receiver has low input currents
(±200μA), so it presents a 1/4 unit load to the RS-485
bus, and allows up to 128 receivers on the bus.
The ISL32173E, ISL32175E, ISL32177E are high data
rate receivers that operate at data rates up to 80Mbps.
Their 8ns maximum propagation delay skew (tolerance)
guarantees excellent part-to-part matching. The
ISL32273E, ISL32275E, ISL32277E are reduced supply
current versions that operate at data rates up to 20Mbps.
Receiver outputs are tri-statable, and incorporate a hot
plug feature to keep them disabled during power up and
down. Versions are available with a common EN/EN (‘173
pinout), a two channel EN12/EN34 (‘175 pinout), or a
versatile individual channel enable (see Table 1)
A 26% smaller footprint is available with the ISL32177E
and ISL32277E QFN packages, and these two devices
also feature a logic supply pin (VL). The VL supply sets
the switching points of the enable inputs, and the
receiver outputs’ VOH, to levels compatible with a lower
supply voltage in mixed voltage systems. Individual
channel and group enable pins increase the ISL32177E
and ISL32277E’s flexibility.
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Features
• IEC61000 ESD Protection (RS-485 Inputs) ±16.5kV
- Class 3 ESD on all Other Pins . . . . . .>8kV HBM
• Wide Supply Range. . . . . . . . . . . . . 3.0V to 5.5V
• Wide Common Mode Range . . . . . . . -7V to +12V
• Low Part-to-Part Propagation Delay
Tolerance . . . . . . . . . . . . . . . . . . . ±4ns (max)
• Specified for +125°C Operation
• Fail-Safe Open Rx Inputs
• 1/4 Unit Load Allows 128 Devices on the Bus
• Available in Industry Standard Pinouts (‘173/’175)
and a 4x4 QFN (ISL32X77E) with Added Features
• Logic Supply Pin (VL) Eases Operation in Mixed
Supply Systems (ISL32X77E)
• High Data Rates . . . . . . . . . up to 80M or 20Mbps
• Low Shutdown Supply Current . . . . . . . . . . 60μA
• Tri-statable Rx Outputs
• 5V Tolerant Logic Inputs When VCC = 3.3V
Applications*(see page 19)
• Telecom Equipment
• Motor Controllers/Encoders
• Programmable Logic Controllers
• Industrial/Process Control Networks
ISL32177E Part-to-Part Prop
Delay Variability
VCC = 3.3V, +25°C
# of DEVICES = 270
ISL3217XE Data Rate and VL
Performance
1
0
A-B
-1
80Mbps
VCC = 3.3V
RECEIVER PROPAGATION DELAY (ns)
3.0
2.5
2.0
1.5
1.0
0.5
0
-0.5
VL = 2.5V
VL = 1.8V
VL = 1.6V
TIME (4ns/DIV)
November 19, 2009
FN7529.0
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2009. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL32173E, ISL32175E, ISL32177E, ISL32273E, ISL32275E, ISL32277E
Truth Tables (Continued)
RECEIVER ENABLE (ISL32175E, ISL32275E)
INPUTS
OUTPUTS
EN12
EN34
RO1
RO2
RO3
RO4
0 0 Z* Z* Z* Z*
0 1 Z Z EN EN
1
0
EN EN
Z
Z
1 1 EN EN EN EN
NOTE: *Low Power SHDN Mode When All Outputs Disabled;
Z = Tri-state
RECEIVER ENABLE (ISL32177E, ISL32277E)
INPUTS
OUTPUTS
ENX EN EN SHDNEN ROX
COMMENTS
0
XX
0
Z Chan X output disabled
EN1-4 = 0 X X 1 Z* All outputs disabled
X
01
0
Z All outputs disabled
X 0 1 1 Z* All outputs disabled
1 X 0 X EN Individual ENX controls
1 1 X X EN
chan
NOTE: * Low Power SHDN Mode; Z = Tri-state
Typical Operating Circuits (1 of 4 Channels Shown)
NETWORK USING GROUP ENABLES
+3.3V TO 5V
16
VCC
+
0.1μF
ISL32X73E
3 RO R
12 EN
A2
B1
RT
+
0.1μF
+3.3V TO 5V
≥1kΩ
16
VCC
2Y
3Z
ISL32X72E
DI 1
D
EN 4
GND EN
84
GND
8
EN 12
NETWORK USING PAIRED ENABLES
+3.3V TO 5V
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16
VCC
+
0.1μF
ISL32X75E
3 RO1 R
4 EN12
A1 2
B1 1
RT
+3.3V TO 5V
+
0.1μF
16
VCC
ISL32X74E
EN12 4
2 Y1
3 Z1
D DI1 1
GND
8
GND
8
5 FN7529.0
November 19, 2009
5 Page 
ISL32173E, ISL32175E, ISL32177E, ISL32273E, ISL32275E, ISL32277E
Test Circuits and Waveforms
+1.5V
EN
B
A
RO
R
15pF
3V
A 1.5V 1.5V
0V
SIGNAL
GENERATOR
tPLH
tPHL
VCC OR VL
RO 50% 50%
0V
FIGURE 1A. TEST CIRCUIT
FIGURE 1B. MEASUREMENT POINTS
FIGURE 1. RECEIVER PROPAGATION DELAY
SIGNAL
GENERATOR
EN
GND
B
A
RO
R
1kΩ
VCC
OR VL
15pF
SW GND
PARAMETER
tHZ
tLZ
tZH (Notes 15, 21)
tZL (Notes 15, 21)
tZH(SHDN) (Notes 16, 20)
tZL(SHDN) (Notes 16, 20)
A
+1.5V
-1.5V
+1.5V
-1.5V
+1.5V
-1.5V
SW
GND
VCC
GND
VCC
GND
VCC
EN
tZH, tZH(SHDN)
RO
tZL, tZL(SHDN)
RO
1.5V
1.5V
3V OR VL
0V
tHZ
OUTPUT HIGH
LOWER OF
1.5V OR VL/2
VOH - 0.5V VOH
0V
tLZ
LOWER OF
1.5V OR VL/2
OUTPUT LOW
VCC OR VL
VOL + 0.5VVOL
FIGURE 2A. TEST CIRCUIT
FIGURE 2B. MEASUREMENT POINTS
FIGURE 2. RECEIVER ENABLE AND DISABLE TIMES
Application Information
RS-485 and RS-422 are differential (balanced) data
transmission standards for use in long haul or noisy
environments. RS-422 is a subset of RS-485, so RS-485
www.tDraatnaSscheeeivt4eUrs.coamre also RS-422 compliant. RS-422 is a
point-to-multipoint (multidrop) standard, which allows
only one driver and up to 10 (assuming one unit load
devices) receivers on each bus. RS-485 is a true
multipoint standard, which allows up to 32 one unit load
devices (any combination of drivers and receivers) on
each bus.
Another important advantage of RS-485 is the extended
common mode range (CMR), which specifies that the
driver outputs and receiver inputs withstand signals that
range from +12V to -7V. RS-422 and RS-485 are
intended for runs as long as 4000’, so the wide CMR is
necessary to handle ground potential differences, as well
as voltages induced in the cable by external fields.
Receiver Features
These devices utilize differential receivers for maximum
noise immunity and common mode rejection. Input
sensitivity is better than ±200mV, as required by the
RS-422 and RS-485 specifications.
Receiver input resistance of 48kΩ surpasses the RS-422
specification of 4kΩ and is four times the RS-485 “Unit
Load (UL)” requirement of 12kΩ minimum. Thus, these
products are known as “one-quarter UL” receivers and
there can be up to 128 of these devices on a network
while still complying with the RS-485 loading
specification.
Receiver inputs function with common mode voltages as
great as +9V/-7V outside the power supplies (i.e., +12V
and -7V with VCC = 3.0V), making them ideal for long
networks where induced voltages, and ground potential
differences are realistic concerns.
All the receivers include a “fail-safe open” function that
guarantees a high level receiver output if the receiver
inputs are unconnected (floating).
All receivers easily support a 20Mbps data rate, and the
ISL32173E, ISL32175E, and ISL32177E support data
rates up to 80Mbps. All receiver outputs are tri-statable,
with the enable scheme varying by part type (see next
section).
Receiver Enable Functions
All product types include functionality to allow disabling
of the Rx outputs. The ISL32X73E types feature group
(all four Rx) enable functions that are active high (EN) or
active low (EN). Receivers enable when EN = 1, or when
EN = 0, and they disable only when EN = 0 and EN = 1.
ISL32X75E versions use active high paired enable
11 FN7529.0
November 19, 2009
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet ISL32173E.PDF ] | |
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