SP3485
+3.3V Low Power Half-Duplex RS-485 Transceiver with 10Mbps Data Rate
Manufacturer
Exar
Overview
Part: SP3485 from Exar
Type: Half-Duplex RS-485 Transceiver
Key Specs:
- Supply Voltage: +3.3V
- Maximum Data Rate: 10 Mbps
- Common-Mode Input Voltage Range: -7V to +12V
- Maximum Bus Transceivers: 32
- Storage Temperature: -65°C to +150°C
- Power Dissipation (8-pin NSOIC): 600mW
Features:
- RS-485 and RS-422 Transceiver
- Interoperable with +5.0V logic
- Driver/Receiver Enable
- Compatibility with industry standard 75176 pinout
- Driver Output Short-Circuit Protection
- Pin-to-pin compatible with Exar SP481, SP483, SP485 devices
- Utilizes Exar BiCMOS process for low power operation
Applications:
- Null
Package:
- 8-pin NSOIC: dimensions not specified
Pin Configuration
Electrical Characteristics
| PARAMETERS | MIN. | TYP. | MAX. | UNITS | CONDITIONS |
|---|---|---|---|---|---|
| SP3485 DRIVER AC Characteristics continued | |||||
| Driver Enable to Output High | 52 | 120 | ns | Figures 4 and 11 | |
| Driver Enable to Output Low | 60 | 120 | ns | Figures 5 and 11 | |
| Driver Disable Time from Low | 40 | 120 | ns | Figures 5 and 11 | |
| Driver Disable Time from High | 60 | 120 | ns | Figures 4 and 11 | |
| SP3485 RECEIVER | |||||
| DC Characteristics | |||||
| Differential Input Threshold | -0.2 | +0.2 | Volts | -7V ≤ VCM ≤ +12V | |
| Input Hysteresis | 20 | mV | VCM = 0V | ||
| Output Voltage HIGH | Vcc-0.4 | Volts | VID = +200mV, -1.5mA | ||
| Output Voltage LOW | 0.4 | Volts | VID = -200mV, 2.5mA | ||
| Three-State (High Impedance) Output Current | +/-1 | μA | 0V ≤ VO ≤ VCC; RE = VCC | ||
| Input Resistance | 12 | 15 | kΩ | -7V ≤ VCM ≤ +12V | |
| Input Current (A, B); VIN = 12V | +1.0 | mA | DE = 0V, VCC = 0V or 3.6V, VIN = 12V | ||
| Input Current (A, B); VIN = -7V | -0.8 | mA | DE = 0V, VCC = 0V or 3.6V, VIN = -7V | ||
| Short Circuit Current | 7 | 60 | mA | 0V ≤ VCM ≤ VCC | |
| SP3485 RECEIVER | |||||
| AC Characteristics | |||||
| Maximum Data Rate | 10 | Mbps | RE = 0V, DE = 0V | ||
| Receiver Input to Output, tPLH | 40 | 70 | 100 | ns | Figures 6 and 12 |
| Receiver Input to Output, tPLH | 70 | ns | TAMB = +25°C, Vcc = 3.3V, Figures 6 and 12 | ||
| Receiver Input to Output, tPHL | 40 | 70 | 100 | ns | Figures 6 and 12 |
| Receiver Input to Output, tPHL | 70 | ns | TAMB = +25°C, Vcc = 3.3V, Figures 6 and 12 | ||
| Differential Receiver Skew | 4 | ns | tRSKEW = tRPHL- tRPLH , Figures 6 and 12 | ||
| Receiver Enable to Output Low | 35 | 60 | ns | Figures 7 and 13, S1 closed, S2 open | |
| Receiver Enable to Output High | 35 | 60 | ns | Figures 7 and 13, S2 closed, S1 open | |
| Receiver Disable from Low | 35 | 60 | ns | Figures 7 and 13, S1 closed, S2 open | |
| Receiver Disable from High | 35 | 60 | ns | Figures 7 and 13, S2 closed, S1 open | |
| POWER REQUIREMENTS | |||||
| Supply Current , No Load | 1000 | 2000 | μA | RE, DI = 0V or VCC ; DE = VCC | |
| Supply Current , No Load | 800 | 1500 | μA | RE = 0V, DI = 0V or VCC, DE = 0V |
Absolute Maximum Ratings
These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.
- Input Voltages
- Logic-0.3V to +6.0V
- Drivers-0.3V to +6.0V
- Receivers+/-15V
- Output Voltages
- Drivers+/-15V
- Receivers-0.3V to +6.0V
- Storage Temperature-65˚C to +150˚C
- Power Dissipation
- 8-pin NSOIC600mW
- (derate 6.90mW/ºC above +70°C)
| ELECTRICAL CHARACTERISTICS | ||||
|---|---|---|---|---|
| TAMB = TMIN to TMAX and VCC = +3.3V +/-5% unless otherwise noted. | ||||
| PARAMETERS | MIN. | TYP. | MAX. | UNITS |
| SP3485 DRIVER | ||||
| DC Characteristics | ||||
| Differential Output Voltage | GND | Vcc | Volts | |
| Differential Output Voltage | 2 | Vcc | Volts | |
| Differential Output Voltage | 1.5 | Vcc | Volts | |
| Change in Magnitude of Driver Differential Output Voltage for Complimentary states | 0.2 | Volts | ||
| Driver Common Mode Output Voltage | 3 | Volts | ||
| Input High Voltage | 2.0 | Volts | ||
| Input Low Voltage | 0.8 | Volts | ||
| Input Current | +/-10 | μA | ||
| Driver Short Circuit Current VOUT = HIGH | +/-250 | mA | ||
| Driver Short Circuit Current VOUT = LOW | +/-250 | mA | ||
| SP3485 DRIVER | ||||
| AC Characteristics | ||||
| Maximum Data Rate | 10 | Mbps | ||
| Driver Input to Output, tPLH | 20 | 40 | 60 | ns |
| Driver Input to Output, tPHL | 20 | 40 | 60 | ns |
| Differential Driver Skew | 2 | 10 | ns | |
| Driver Rise or Fall Time | 5 | 20 | ns |
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