Description

The SC28C94A1A is a quad universal asynchronous receiver/transmitter (UART) that combines four enhanced Philips Semiconductors industry-standard UARTs with an innovative interrupt scheme. It is implemented using Philips Semiconductors’ high-speed CMOS process and is designed for low power consumption. The SC28C94A1A allows for independent selection of operating speed for each receiver and transmitter, making it particularly attractive for dual-speed channel applications. With its small die size, cost-effectiveness, and various programmable features, the SC28C94A1A is suitable for a wide range of electronic applications.

Specifications and features

• New low overhead interrupt control
• All commercial parts meet industrial timing and temperature parameters
• Four Philips Semiconductors industry-standard UARTs
• Eight byte receive FIFO and eight byte transmit FIFO for each UART
• Programmable data format:
• 5 to 8 data bits plus parity
• Odd, even, no parity or force parity
• 1, 1.5 or 2 stop bits programmable in 1/16-bit increments
• Baud rate for the receiver and transmitter selectable from:
• 23 fixed rates: 50 to 230.4K baud; Non-standard rates to 1.0 M baud
• User-defined rates from the programmable counter/timer associated with each of two blocks
• External 1x or 16x clock
• Parity, framing, and overrun error detection
• False start bit detection
• Line break detection and generation
• Programmable channel mode:
• Normal (full-duplex), automatic echo, local loop back, remote loopback
• Programmable interrupt priorities
• Identification of highest priority interrupt
• Global interrupt register set provides data from interrupting channel
• Vectored interrupts with programmable vector format
• IACKN and programmable DTACKN signals
• Built-in baud rate generator with choice of 18 rates
• Four I/O pins per UART for modem controls, clocks, etc.
• Power down mode
• High-speed CMOS technology
• 52-pin PLCC package
• Commercial and industrial temperature ranges available
• On-chip crystal oscillator
• TTL compatible
• Single +5V power supply with low power mode
• Two multifunction programmable 16-bit counter/timers
• 1MHz 16x mode operation
• 10ns data bus release time
• “Watch Dog” timer for each receiver

Application Scenarios

The SC28C94A1A is suitable for a wide range of electronic applications including clustered terminal systems, communication devices, and industrial equipment. Its programmable features and multiple UARTs make it versatile for various data transmission and communication requirements. It can be used in dual-speed channel applications where different operating speeds are needed for receivers and transmitters.

Comparison

• Four enhanced Philips Semiconductors industry-standard UARTs
• Independent selection of operating speed for each receiver and transmitter
• Programmable data format and various baud rates
• Error detection and channel mode options
• Low power consumption and power down mode

• 52-pin PLCC package may require additional space and compatibility considerations
• Limited number of I/O pins per UART
• Requires external clock or crystal oscillator
• Only compatible with +5V power supply