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Product Detailed Parameters
- Description：IC TRANSCEIVER FULL 3/5 20SSOP
- Mfr：Analog Devices Inc./Maxim Integrated
- Package：Tube
- Series：-
- Type：Transceiver
- Protocol：RS232
- Number of Drivers/Receivers：3月5日
- Duplex：Full
- Data Rate：230kbps
- Voltage - Supply：4.5V ~ 5.5V
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Surface Mount
- Package / Case：20-SSOP (0.209", 5.30mm Width)
- Supplier Device Package：20-SSOP
- Receiver Hysteresis：650 mV
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Overview
The MAX3185EAP is a complete DTE RS-232 serial port transceiver designed for desktop PC and motherboard applications. It features three RS-232 transmitters and five RS-232 receivers without an internal charge pump, optimizing it for direct logic-level interfacing. The device operates with VCC between +4.5V and +5.5V, VDD between +10.8V and +13.2V, and VSS between -10.8V and -13.2V. It guarantees data rates up to 230kbps and provides enhanced ESD protection of ±15kV (Human Body Model) and ±8kV (IEC Contact Discharge). Power-supply currents are less than 300µA for IDD and ISS, and less than 1mA for ICC. The component is housed in a 20-pin SSOP package.
Feature Summary
- Enhanced ESD protection on all transmitter outputs and receiver inputs
- Pin and functionally compatible with industry-standard 75185
- Flow-through pinout architecture for simplified board layout
- Latchup-free operation during electrostatic discharge events
Applications
- Desktop PC motherboards
- Instruments meeting IEC1000-4-2 standards
- Equipment requiring EMC compliance
Procurement Notes
Verify the specific ordering suffix 'EAP' corresponds to the -40°C to +85°C temperature range and the 20-pin SSOP package configuration. Confirm that the procurement source provides documentation matching the official Maxim Integrated datasheet specifications. Ensure compatibility with existing designs by validating pin assignments against the SN75C185 standard.
Selection Notes
Select this component when designing systems that require robust ESD protection without the complexity of onboard charge pumps. It is suitable for applications needing full-duplex communication with three drivers and five receivers. Verify that the system power supplies can provide the required dual voltage rails for optimal RS-232 signal levels.
Part Context
The MAX3185 series serves as a drop-in replacement for legacy RS-232 transceivers like the SN75C185. It addresses modern electromagnetic compatibility requirements while maintaining backward compatibility with established hardware designs. The device bridges TTL/CMOS logic interfaces with RS-232 serial ports in compact form factors.
Replacement Considerations
The MAX3185 is pin-compatible with the SN75C185. Verify that substitute components maintain identical pin assignments and electrical characteristics to ensure seamless integration into existing PCB layouts without redesign.
FAQ
Does the MAX3185 include an internal charge pump?
No, the MAX3185 does not include an internal charge pump, which optimizes it for desktop PC and motherboard applications.
What is the guaranteed maximum data rate for the MAX3185?
The MAX3185 is guaranteed to operate at data rates up to 230kbps.
How does the MAX3185 handle latchup during ESD events?
The device is latchup-free during electrostatic discharge events, ensuring continued functionality after exposure to static electricity.
