Overview
The LTC1387IG#PBF, produced by Analog Devices Inc., is a versatile and low-power reconfigurable CMOS bidirectional transceiver. This device can be configured to operate as either an RS485 differential port or as two RS232 single-ended ports. It is designed to meet the requirements of various serial communication protocols, making it a flexible solution for a wide range of applications.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Supply Voltage (VCC) | 5 | 6.5 | V | ||
| Input Voltage Drivers | -0.3 | VCC + 0.3 | V | ||
| Receivers Input Voltage | -25 | 25 | V | ||
| Differential Input Threshold Voltage (VTH) | -7V ≤ VCM ≤ 12V | -0.20 | 0.20 | V | |
| Input Hysteresis (∆VTH) | VCM = 0V | 40 | mV | ||
| Input Current (IIN) | VIN = 12V | 1 | mA | ||
| Input Current (IIN) | VIN = -7V | -0.8 | mA | ||
| Input Resistance (RIN) | kΩ | ||||
| Shutdown Mode ICC Supply Current | 5 | µA |
Key Features
- Low power consumption with a shutdown mode reducing ICC supply current to 5µA.
- Reconfigurable as an RS485 differential port or two RS232 single-ended ports.
- Onboard charge pump generates boosted positive and negative supplies from a single 5V supply.
- Compliance with RS232, RS485, and RS422 specifications.
- Short-circuit and thermal shutdown protection for interface drivers.
- Enable pin allows RS485 driver outputs to be forced into high impedance.
Applications
The LTC1387IG#PBF is suitable for various serial communication applications, including industrial control systems, point-of-sale terminals, and any system requiring flexible and reliable serial communication interfaces. It is particularly useful in environments where both RS232 and RS485 protocols need to be supported with minimal component count and power consumption.
Q & A
- What is the primary function of the LTC1387IG#PBF?
The LTC1387IG#PBF is a reconfigurable CMOS bidirectional transceiver that can operate as either an RS485 differential port or two RS232 single-ended ports. - What is the supply voltage range for the LTC1387IG#PBF?
The supply voltage range is up to 6.5V, with a typical operating voltage of 5V. - How does the onboard charge pump work?
The onboard charge pump uses four 0.1µF capacitors to generate boosted positive and negative supplies from a single 5V supply, allowing the RS232 drivers to meet ±5V output swing requirements. - Is the LTC1387IG#PBF compliant with industry standards?
Yes, it is compliant with RS232, RS485, and RS422 specifications. - What protection features does the LTC1387IG#PBF have?
The device features short-circuit and thermal shutdown protection for the interface drivers. - How can the RS485 driver outputs be controlled?
The RS485 driver outputs can be forced into high impedance using an enable pin. - What is the power consumption in shutdown mode?
In shutdown mode, the ICC supply current is reduced to 5µA. - What are some typical applications for the LTC1387IG#PBF?
It is used in industrial control systems, point-of-sale terminals, and any system requiring flexible and reliable serial communication interfaces. - Does the LTC1387IG#PBF support multiple communication protocols?
Yes, it supports both RS232 and RS485 protocols. - How does the device handle floating or shorted inputs in RS485 mode?
The RS485 receiver assumes a known output state when the inputs are floating or shorted to ground.
