Features: 100% RS-485 compliant
- Guaranteed RS-485 device interoperation
Low power CMOS design: ICC 500 A max
Built-in power up/down glitch-free circuitry
- Permits live transceiver insertion/displacement
DIP and SOIC packages available
Industrial temperature range: -40 to +85
On-board thermal shutdown circuitry
- Prevents damage to the device in the event of excessive power dissipation
Wide common mode range: -7V to +12V
Receiver open input fail-safe (Note 1)
1/4 unit load (DS36C278): 128 nodes
1/2 unit load (DS36C278T): 64 nodes
ESD (human body model): 2kV
Drop in replacement for:
- LTC485, MAX485, DS75176, DS3695Pinout
Specifications
| Function |
Transceiver |
| Channels |
1 Channels |
| SupplyVoltage |
5 Volt |
| Process |
CMOS |
| Special Features |
1/2, 1/4 UL options |
| Temperature Min |
0 deg C |
| Temperature Max |
70 deg C |
| JTAG1149.1 |
No |
| Drivers |
1 |
| Receivers |
1 |
| View Using Catalog |
DescriptionThe DS36C278 is a low power differential bus/line transceiver designed to meet the requirements of RS-485 standard for multipoint data transmission. In addition it is compatible with TIA/EIA-422-B.
The CMOS design offers significant power savings over its bipolar and ALS counterparts without sacrificing ruggedness against ESD damage. The device is ideal for use in battery powered or power conscious applications. ICC is specified at 500 µA maximum.
The DS36C278 driver and receiver outputs feature TRI-STATE® capability. The driver outputs operate over the entire common mode range of -7V to +12V. Bus contention or fault situations that cause excessive power dissipation within the device are handled by a thermal shutdown circuit, which forces the driver outputs into the high impedance state.
The DS36C278 receiver incorporates a fail safe circuit which guarantees a high output state when the inputs are left open.
The DS36C278T is fully specified over the industrial temperature range (-40°C to +85°C).
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
| DS36C278 MWC |
LMDMOS |
0 |
16810 |
0 |
0 |
2200000 |
2 |
624256007 |
| DS36C278M |
LMDMOS |
0 |
16810 |
0 |
0 |
2200000 |
2 |
624256007 |
| DS36C278MX |
LMDMOS |
0 |
16810 |
0 |
0 |
2200000 |
2 |
624256007 |
| DS36C278TM |
LMDMOS |
0 |
16810 |
0 |
0 |
2200000 |
2 |
624256007 |
| DS36C278TMX |
LMDMOS |
0 |
16810 |
0 |
0 |
2200000 |
2 |
624256007 |
| DS36C278TN |
LMDMOS |
0 |
16810 |
0 |
0 |
2200000 |
2 |
624256007 |
Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.For more information on Reliability Metrics, please click here.
Application Notes
| Title |
Size in Kbytes |
Date |
|
| AN-1057: Application Note 1057 Ten Ways to Bulletproof RS-485 Interfaces |
155 Kbytes |
2-Oct-02 |
Download |
If you have trouble printing or viewing PDF file(s), see Printing Problems.
|
DS36C278 Data Sheet
