Document
DATASHEET
ISL3298EMRTEP
16kV ESD Protected, +125°C, 3.0V to 5.5V, TDFN Packaged, Low Power RS-485/RS-422 Transmitter
FN7607 Rev.2.00 Oct 24, 2019
The ISL3298EMRTEP is a ±16.5kV HBM ESD Protected (7kV IEC61000 contact), 3.0V to 5.5V powered, single transmitter for balanced communication using the RS-485 and RS-422 standards. This driver has very low bus currents (±40mA); therefore, it presents less than a 1/8 unit load to the RS-485 bus. This allows more than 256 transmitters on the network without violating the RS-485 specification 32 unit load maximum, and without using repeaters.
Hot Plug circuitry ensures that the Tx outputs remain in a high impedance state while the power supply stabilizes.
The driver on the ISL3298EMRTEP is not limited, so it can achieve a 16Mbps data rate and is offered in the -55°C to +125°C temperature range.
This devices also feature a logic supply pin (VL) that sets the switching points of the DE and DI inputs to be compatible with a lower supply voltage in mixed voltage systems.
For a companion single RS-485 receiver in micro packages, see the ISL3282EMRTEP datasheet.
Applications
• Clock distribution
• High node count systems
• Space constrained systems
• Security camera networks
• Building environmental control/lighting systems
• Industrial/process control networks
Related Literature
For a full list of related documents, visit our website:
• ISL3298EMRTEP device page
Features
• Specifications per DLA VID V62/10602 • Full mil-temp electrical performance from -55°C to +125°C • Controlled baseline with one wafer fabrication site and one
assembly/test site • Full homogeneous lot processing in wafer fab • No combination of wafer fabrication lots in assembly • Full traceability through assembly and test by date/trace
code assignment • Enhanced process change notification • Enhanced obsolescence management • Eliminates need for up-screening a COTS component • High ESD protection on RS-485 outputs ±16.5kV HBM
- IEC61000-4-2 contact test method . . . . . . . . . . . . . . . ±7kV - Class 3 ESD level on all other pins. . . . . . . . . . . .>8kV HBM
• Specified for +125°C operation (VCC ≤ 3.6V only) • Logic supply pin (VL) eases operation in mixed supply
systems
• Hot plug - Tx output remains tri-state during power-up
• Low Tx leakage allows >256 devices on the Bus
• High data rates. . . . . . . . . . . . . . . . . . . . . . . . . . up to 16Mbps
• Low quiescent supply current. . . . . . . . . . . . . . . 150µA (Max) - Very low shutdown supply current . . . . . . . . . . . 1µA (Max)
• -7V to +12V Common Mode Output Voltage Range (VCC ≤ 3.6V Only)
• Current limiting and thermal shutdown for driver overload protection (VCC ≤ 3.6V Only)
• Tri-statable Tx output
• 5V tolerant logic input when VCC ≤5V
PART NUMBER
ISL3298EMRTEP
FUNCTION 1 Tx
DATA RATE (Mbps)
16
TABLE 1. SUMMARY OF FEATURES
SLEW-RATE LIMITED?
NO
HOT PLUG?
YES
VL PIN? YES
TX ENABLE?
YES
MAXIMUM QUIESCENT ICC
(µA)
150
LOW POWER SHUTDOWN?
YES
PIN COUNT
8-TDFN
FN7607 Rev.2.00 Oct 24, 2019
Page 1 of 11
ISL3298EMRTEP
Truth Table
TRANSMITTING
INPUTS
OUTPUTS
DE DI
Z
Y
1101
1010
0
X
High-Z *
High-Z *
NOTE: *Shutdown Mode
Pin Descriptions
Pin Configuration
8 LD TDFN TOP VIEW
VL 1 DE 2 DI 3 GND 4
D
8 VCC 7Z 6Y 5 GND
PIN NUMBER 1
2
3
4, 5 6 7 8
PIN SYMBOL
FUNCTION
VL Logic-Level supply which sets the VIL/VIH levels for the DI and DE pins. Power-up this supply after VCC, and keep VL ≤VCC.
DE Driver output enable. The driver outputs, Y and Z, are enabled by bringing DE high, and are high impedance when DE is low. If the driver enable function isn’t needed, connect DE to VCC (or VL) through a 1kΩ to 3kΩ resistor.
DI Driver input. A low on DI forces output Y low and output Z high. Similarly, a high on DI forces output Y high and output Z low.
GND Ground connection. This is also the potential of the TDFN thermal pad.
Y ±15kV HBM, ±7kV IEC61000 (contact method) ESD Protected RS-485/422 level, noninverting transmitter output.
Z ±15kV HBM, ±7kV IEC61000 (contact method) ESD Protected RS-485/422 level, inverting transmitter output.
VCC System power supply input (3.0V to 5.5V). On devices with a VL pin, power-up VCC first.
Ordering Information
PART NUMBER (Note)
VENDOR ITEM DRAWING
PART MARKING
ISL3298EMRTEP-TK
V62/10602-01XB 298
NOTE: See TB347 for details about reel specifications.
TEMP. RANGE (°C)
-55 to +125
TAPE AND REEL (Units)
1k
PACKAGE 8 Ld TDFN
PKG. DWG. #
L8.2X3A
FN7607 Rev.2.00 Oct 24, 2019
Page 2 of 11
ISL3298EMRTEP
Typical Operating Circuit
VCC
LOGIC DEVICE (µP, ASIC, UART)
NETWORK WITH VL PIN FOR INTERFACING TO LOWER VOLTAGE LOGIC DEVICES
2.5V +3.3V TO 5V
+3.3V
1.8V
64 VL VCC
+ 0.1µF
0.1µF +
8 VCC
1 VL
ISL3282EMRTEP
ISL3298EMRTEP
1 RO R 7 RE
A5 B8
RT
6Y 7Z
D DI 3 DE 2
GND 2
GND 4, 5
VCC
LOGIC DEVICE (µP, ASIC, UART)
Test Circuits and Wav.