ACTIVE
Part Number
UM491
Description
2.5Mbps Full-Duplex RS-422 Transceivers with IEC ESD Protection
Status
ACTIVE
Drivers/Receivers Per Package
1/1
Max Date rate (Mbps)
2.5
Bus Fault Protection (V)
-7.5 to 12.5
Common-mode range (V)
-7 to 12
VCC Range (V)
4.75 to 5.25
VIO Range (V)
-
ICC (Max) (mA)
0.9
ESD HBM (kV)
±8
IEC 61000-4-2 Contact (kV)
-
Operating Temperature Range (℃)
-40 to 85
Package
SOP14, DIP14
The UM491 is ±8kV electrostatic discharge (ESD)-protected, high-speed transceivers for RS-422 communication that contain one driver and one receiver. The UM491 contains an additional receiver and driver enable control. The device features fail-safe circuitry, which guarantees a logic-high receiver output when the receiver inputs are open or shorted. This means that the receiver output will be a logic high if all transmitters on a terminated bus are disabled (high impedance). The UM491 offers higher driver output slew-rate limits, allowing transmit speeds up to 2.5Mbps. The device features enhanced ESD protection. All transmitter outputs and receiver inputs are protected to ±8kV using the Human Body Model.
The UM491 typically draws 600礎 of supply current when unloaded, or when fully loaded with the drivers disabled.
The UM491 has a 1/8-unit-load receiver input impedance that allows up to 256 transceivers on the bus. The UM488/UM491 is intended for full-duplex communications.
- ESD Protection for RS-422 I/O Pins
-- ±8kV, Human Body Model
- True Fail-Safe Receiver while Maintaining EIA/TIA-422 Compatibility
- Enhanced Slew-Rate Limiting Facilitates Error-Free Data Transmission
- 1nA Low-Current Shutdown Mode
- Allow up to 256 Transceivers on the Bus
- RS-422 Communications
- Level Translators
- Transceivers for EMI-Sensitive Applications
- Industrial-Control Local Area Networks
| Part Number | Packaging Type | Marking Code | Shipping Qty |
|---|---|---|---|
| UM491EESE | SOP14 | UM491EESE | 2500pcs/13Inch Tape & Reel |
| UM491EEPE | DIP14 | UM491EEPE | 25pcs/Tube |
