Overview
The ST75185C, produced by STMicroelectronics, is a multiple RS-232 driver and receiver integrated circuit. It is designed to meet and exceed the requirements of the EIA/TIA-232-E and ITU V.28 standards. This chip is particularly useful for interfacing between UARTs and serial port connectors in IBM PC/AT and compatible systems. The ST75185C features three drivers and five receivers, with a pinout compatible with the DB9S connector, which helps reduce part count and board space. It supports data rates up to 120 kbps and operates over a temperature range of 0°C to 70°C.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Supply Voltage (VDD) | 7.5 | 15 | V | |
| Supply Voltage (VSS) | -15 | -7.5 | V | |
| Supply Voltage (VCC) | 4.5 | 5.5 | V | |
| Operating Temperature Range | 0 | 70 | °C | |
| Data Rate | 120 | kbps | ||
| Driver Output Voltage Range | -15 | 15 | V | |
| Receiver Input Voltage Range | -30 | 30 | V | |
| Propagation Delay Time (Low to High) | 315 | 500 | ns | |
| Propagation Delay Time (High to Low) | 75 | 175 | ns |
Key Features
- Meets and exceeds EIA/TIA-232-E and ITU V.28 standards.
- Single chip with easy interface between UART and serial port connector of IBM PC/AT and compatibles.
- Contains three drivers and five receivers.
- Pinout compatible with DB9S connector design to reduce part count and board space.
- Supports data rates up to 120 kbps.
- Operates over a temperature range of 0°C to 70°C.
- Bipolar circuits provide a rugged, low-cost solution.
- Available in TSSOP20 and SO-20 packages.
Applications
- Serial communication interfaces in computers and peripherals.
- Industrial control systems requiring RS-232 communication.
- Point-of-sale terminals and other serial-based devices.
- Embedded systems needing reliable serial communication.
- Legacy systems that require compatibility with older serial standards.
Q & A
- What are the main features of the ST75185C?
The ST75185C is a multiple RS-232 driver and receiver IC, meeting EIA/TIA-232-E and ITU V.28 standards, with three drivers and five receivers, and supports data rates up to 120 kbps.
- What is the operating temperature range of the ST75185C?
The ST75185C operates over a temperature range of 0°C to 70°C.
- What are the supply voltage requirements for the ST75185C?
The supply voltage requirements are VDD: 7.5V to 15V, VSS: -15V to -7.5V, and VCC: 4.5V to 5.5V.
- What is the maximum data rate supported by the ST75185C?
The ST75185C supports data rates up to 120 kbps.
- What types of packages are available for the ST75185C?
The ST75185C is available in TSSOP20 and SO-20 packages.
- What are the typical applications of the ST75185C?
Typical applications include serial communication interfaces in computers and peripherals, industrial control systems, point-of-sale terminals, and embedded systems.
- How does the ST75185C protect against power supply faults?
The ST75185C can be protected with diodes placed in series with the VDD and VSS leads to prevent damage in fault conditions.
- What are the propagation delay times for the drivers in the ST75185C?
The propagation delay times are 315 ns to 500 ns for low to high and 75 ns to 175 ns for high to low.
- Is the ST75185C compatible with older serial standards?
Yes, the ST75185C is designed to be compatible with older serial standards such as EIA/TIA-232-E and ITU V.28.
- What is the thermal resistance junction-case for the TSSOP20 package?
The thermal resistance junction-case for the TSSOP20 package is 27.22 °C/W.
