Overview
The SN75LP1185DBR, produced by Texas Instruments, is a low-power bipolar device designed for multiple RS-232 driver and receiver applications. It features three drivers and five receivers, making it a versatile component for serial communication systems. The device is characterized by its flow-through pinout, which matches the industry-standard SN75185 and SN75C185, facilitating easy interconnection with UART and serial-port connectors. It operates within a temperature range of 0°C to 70°C and is known for its ruggedness and low-cost solution with 15 kV of ESD protection on the bus pins.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of Drivers | 3 | |
| Number of Receivers | 5 | |
| Operating Temperature Range | 0°C to 70°C | |
| Supply Voltage Range (VCC) | –0.5 V to 7 V | V |
| Supply Voltage Range (VDD) | –0.5 V to 15 V | V |
| Supply Voltage Range (VSS) | 0.5 V to –15 V | V |
| Input Voltage Range (Receiver) | –30 V to 30 V | V |
| Input Voltage Range (Driver) | –0.5 V to VCC + 0.4 V | V |
| Output Voltage Range (Receiver) | –0.5 V to 6 V | V |
| Output Voltage Range (Driver) | –15 V to 15 V | V |
| Propagation Delay Time (Driver) | 300 ns to 1600 ns | ns |
| Propagation Delay Time (Receiver) | 400 ns to 900 ns | ns |
| Output Slew Rate | 4 V/µs to 30 V/µs | V/µs |
| ESD Protection | 15 kV | |
| Package Options | SSOP (DB), SOIC (DW), DIP (N) |
Key Features
- Low-power bipolar device with three drivers and five receivers.
- Flow-through pinout compatible with industry-standard SN75185 and SN75C185.
- 15 kV of ESD protection on bus pins.
- Internal slew-rate control with a maximum rate of change in the output signal of 30 V/µs.
- Driver output swing nominally clamped at ±6 V to enable higher data rates and reduce EMI emissions.
- Compliance with TIA/EIA-232-F and ITU V.28 standards.
- Supports data rates up to 256 kbit/s.
- All logic inputs can accept 3.3-V or 5-V input signals.
Applications
The SN75LP1185DBR is suitable for various serial communication applications, including:
- Serial-port connectors in IBM PC/AT and compatible systems.
- Industrial control systems requiring robust serial communication.
- Point-of-sale terminals and other peripheral devices.
- Any application needing multiple RS-232 drivers and receivers with low power consumption and high ESD protection.
Q & A
- What is the operating temperature range of the SN75LP1185DBR?
The operating temperature range is 0°C to 70°C. - How many drivers and receivers does the SN75LP1185DBR have?
The device has three drivers and five receivers. - What is the ESD protection level of the SN75LP1185DBR?
The device has 15 kV of ESD protection on the bus pins. - What are the supported data rates for the SN75LP1185DBR?
The device supports data rates up to 256 kbit/s. - Is the SN75LP1185DBR compliant with any industry standards?
Yes, it complies with TIA/EIA-232-F and ITU V.28 standards. - What are the package options available for the SN75LP1185DBR?
The device is available in SSOP (DB), SOIC (DW), and DIP (N) packages. - Can the SN75LP1185DBR handle 3.3-V and 5-V input signals?
Yes, all logic inputs can accept 3.3-V or 5-V input signals. - What is the purpose of the internal slew-rate control in the SN75LP1185DBR?
The internal slew-rate control limits the maximum rate of change in the output signal to 30 V/µs to enable higher data rates and reduce EMI emissions. - How does the SN75LP1185DBR protect against power-off fault conditions?
Diodes placed in series with the VDD and VSS leads protect the device in fault conditions when the device outputs are shorted to ±15 V and the power supplies are at low voltage. - What is the typical output voltage swing of the drivers in the SN75LP1185DBR?
The driver output swing is nominally clamped at ±6 V.
