ISL8491E Datasheet PDF - Intersil Corporation
| Part Number | ISL8491E | |
| Description | +-15kV ESD Protected 5V Low Power | |
| Manufacturers | Intersil Corporation | |
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ISL8488E, ISL8489E, ISL8490E, ISL8491E
®
Data Sheet
July 26, 2007
www.DataSheet4U.com
FN6073.4
±15kV ESD Protected, 5V, Low Power,
High Speed and Slew Rate Limited, Full
Duplex, RS-485/RS-422 Transceivers
The ISL8488E, ISL8489E, ISL8490E, ISL8491E devices are
ESD protected, BiCMOS, 5V powered, single transceivers
that meet both the RS-485 and RS-422 standards for
balanced communication. Each driver output and receiver
input is protected against ±15kV ESD strikes, without
latch-up. Unlike competitive versions, these Intersil devices
are specified for 10% tolerance supplies (4.5V to 5.5V).
These devices are configured for full duplex (separate Rx
input and Tx output pins) applications, so they are ideal for
RS-422 networks requiring high ESD tolerance on the bus
pins. The ISL8488E, ISL8490E are 8 Ld versions without Rx
and Tx output enables. The other two versions include Rx
and Tx output enable pins in a standard 14 Ld pinout.
The ISL8488E, ISL8489E utilize slew rate limited drivers
which reduce EMI, and minimize reflections from improperly
terminated transmission lines, or unterminated stubs in
multidrop and multipoint applications.
Data rates up to 10Mbps are achievable by using the
ISL8490E, ISL8491E, which feature higher slew rates.
The devices present a “single unit load” to the RS-485 bus,
which allows a total of 32 transmitters and receivers on the
network. For “1/8 unit load” versions (256 devices on the
bus), please refer to the ISL4489E, ISL4491E data sheet.
Receiver (Rx) inputs feature a “fail-safe if open” design,
which ensures a logic high Rx output if Rx inputs are floating.
Driver (Tx) outputs are short circuit protected, even for
voltages exceeding the power supply voltage. Additionally,
on-chip thermal shutdown circuitry disables the Tx outputs to
prevent damage if power dissipation becomes excessive.
Features
• RS-485 I/O Pin ESD Protection . . . . . . . . . . . . . ±15kV HBM
- Class 3 ESD Level on all Other Pins . . . . . . >7kV HBM
• High Data Rates (ISL8490E, ISL8491E) . . up to 10Mbps
• Slew Rate Limited for Error Free Data Transmission
(ISL8488E, ISL8489E)
• Single Unit Load Allows up to 32 Devices on the Bus
(See ISL4489E, ISL4491E for 256 Devices on Bus)
• Low Quiescent Current:
- 120µA (ISL8488E)
- 140µA (ISL8489E)
- 370µA (ISL8490E, ISL8491E)
• -7V to +12V Common Mode Input Voltage Range
• Three-State Rx and Tx Outputs (Except ISL8488E,
ISL8490E)
• Full Duplex Pinout
• Operates from a Single +5V Supply (10% Tolerance)
• Current Limiting and Thermal Shutdown for Driver
Overload Protection
• Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
• Factory Automation
• Security Networks
• Building Environmental Control Systems
• Industrial/Process Control Networks
• Level Translators (e.g., RS-232 to RS-422)
• RS-232 “Extension Cords”
PART HALF/FULL
NUMBER DUPLEX
ISL8488E
Full
ISL8489E
Full
ISL8490E
Full
ISL8491E
Full
HIGH ESD?
Yes
Yes
Yes
Yes
TABLE 1. SUMMARY OF FEATURES
NO. OF DEVICES DATA RATE SLEW-RATE
RECEIVER/
QUIESCENT PIN
ALLOWED ON BUS (Mbps)
LIMITED? DRIVER ENABLE? ICC (μA) COUNT
32 0.25 Yes No 120 8
32
0.25 Yes
Yes 140 14
32
10 No
No 370 8
32
10 No
Yes 370 14
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. 2004, 2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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ISL8488E, ISL8489E, ISL8490E, ISL8491E
Electrical Specifications Test Conditions: VCC = 4.5V to 5.5V; Unless Otherwise Specified. Typicals are at wVCwCw=.D5aVt,aTSAh=ee+t245U°C.c,om
(Note 4). (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
TEMP MIN
MAX
(°C) (NOTE 9) TYP (NOTE 9) UNITS
Receiver Short-Circuit Current
IOSR 0V ≤ VO ≤ VCC
SWITCHING CHARACTERISTICS (ISL8488E, ISL8489E)
Full 7
- 85 mA
Driver Input to Output Delay
tPLH, tPHL RDIFF = 54Ω, CL = 100pF (Figure 2)
Full 250
400 2000 ns
Driver Output Skew
tSKEW RDIFF = 54Ω, CL = 100pF (Figure 2)
Full -
160 800 ns
Driver Differential Rise or Fall Time
tR, tF RDIFF = 54Ω, CL = 100pF (Figure 2)
Full 250
600 2000 ns
Driver Enable to Output High
tZH CL = 100pF, SW = GND (Figure 3, Note 8) Full 250 1000 2000 ns
Driver Enable to Output Low
tZL CL = 100pF, SW = VCC (Figure 3, Note 8) Full 250
860 2000
ns
Driver Disable from Output High
tHZ CL = 15pF, SW = GND (Figure 3, Note 8) Full 300
660 3000
ns
Driver Disable from Output Low
tLZ CL = 15pF, SW = VCC (Figure 3, Note 8) Full 300
640 3000
ns
Receiver Input to Output Delay
tPLH, tPHL (Figure 4)
Full 250
500 2000 ns
Receiver Skew | tPLH - tPHL |
tSKD (Figure 4)
25 - 60 - ns
Receiver Enable to Output High
tZH CL = 15pF, SW = GND (Figure 5, Note 8) Full
-
10 50 ns
Receiver Enable to Output Low
tZL CL = 15pF, SW = VCC (Figure 5, Note 8) Full
-
10 50 ns
Receiver Disable from Output High
tHZ CL = 15pF, SW = GND (Figure 5, Note 8) Full
-
10 50 ns
Receiver Disable from Output Low
tLZ CL = 15pF, SW = VCC (Figure 5, Note 8) Full
-
10 50 ns
Maximum Data Rate
fMAX
Full 250
-
- kbps
SWITCHING CHARACTERISTICS (ISL8490E, ISL8491E)
Driver Input to Output Delay
Driver Output Skew
Driver Differential Rise or Fall Time
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable from Output High
Driver Disable from Output Low
Receiver Input to Output Delay
Receiver Skew | tPLH - tPHL |
Receiver Enable to Output High
Receiver Enable to Output Low
Receiver Disable from Output High
Receiver Disable from Output Low
Maximum Data Rate
ESD PERFORMANCE
tPLH, tPHL RDIFF = 54Ω, CL = 100pF (Figure 2)
tSKEW RDIFF = 54Ω, CL = 100pF (Figure 2)
tR, tF RDIFF = 54Ω, CL = 100pF (Figure 2)
tZH CL = 100pF, SW = GND (Figure 3, Note 8)
tZL CL = 100pF, SW = VCC (Figure 3, Note 8)
tHZ CL = 15pF, SW = GND (Figure 3, Note 8)
tLZ CL = 15pF, SW = VCC (Figure 3, Note 8)
tPLH, tPHL (Figure 4)
tSKD (Figure 4)
tZH CL = 15pF, SW = GND (Figure 5, Note 8)
tZL CL = 15pF, SW = VCC (Figure 5, Note 8)
tHZ CL = 15pF, SW = GND (Figure 5, Note 8)
tLZ CL = 15pF, SW = VCC (Figure 5, Note 8)
fMAX
Full
Full
Full
Full
Full
Full
Full
Full
25
Full
Full
Full
Full
Full
13
-
5
-
-
-
-
30
-
-
-
-
-
10
24 50 ns
3 10 ns
12 25 ns
14 70 ns
14 70 ns
44 70 ns
21 70 ns
90 150 ns
5 - ns
9 50 ns
9 50 ns
9 50 ns
9 50 ns
- - Mbps
RS-485 Pins (A, B, Y, Z)
Human Body Model
25 - ±15 - kV
All Other Pins
25 - >±7 - kV
NOTES:
4. All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device ground unless
otherwise specified.
5. Supply current specification is valid for loaded drivers when DE = 0V.
6. Applies to peak current. See “Typical Performance Curves” on page 9 for more information.
7. Devices meeting these limits are denoted as “single unit load (1 UL)” transceivers. The RS-485 standard allows up to 32 Unit Loads on the bus.
8. Not applicable to the ISL8488E, ISL8490E.
9. Parts are 100% tested at +25°C. Over-temperature limits established by characterization and are not production tested.
5 FN6073.4
July 26, 2007
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Featured Datasheets
| Part Number | Description | MFRS |
| ISL8491 | The function is 5V/ Low Power/ High Speed or Slew Rate Limited/ RS-485/RS-422 Transceivers. Intersil Corporation | |
| ISL8491E | The function is +-15kV ESD Protected 5V Low Power. Intersil Corporation | |
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