ST16C1551

Features:

Pin and functionally compatible to SSI 73M1550/2550
16 byte Transmit FIFO
16 byte Receive FIFO with error flags
4 selectable Receive FIFO interrupt trigger levels
Modem Control Signals (CTS#, RTS#, DSR#,DTR#, RI#, CD#)
Programmable character lengths (5, 6, 7, 8) with even, odd or no parity
Crystal or external clock input (except 28 pin ST16C1551, external clock only)
1.5 Mbps Transmit/Receive operation (24 MHz) with programmable clock control
Power Down Mode (50 uA at 3.3 V, 200 uA at 5 V)
Software controllable reset output
2.97 to 5.5 Volt operation




Application

Battery Operated Electronics
Internet Appliances
Handheld Terminal
Personal Digital Assistants
Cellular Phones DataPort




Pinout






Specifications

Specifications
CH	1
CPUInterface	Intel
Data Rate@5/3.3/2.5V	1.5/0.5/na
Tx/RxFIFO(Bytes)	16/16
Tx/RxFIFOCtrs	No
Tx/RxFIFOINT Trig	4 Levels/ 4 Levels
AutoRTS/CTS	No
IrDaSup	No
5VTolInputs	No
Sup V	2.97-5.5
Pkgs	PLCC-28, TQFP-48

Power Supply Range 7 Volts
Voltage at Any Pin GND-0.3 V to 7 V
Operating Temperature -40^o to +85^oC
Storage Temperature -65^oto +150^oC
Package Dissipation 500 mW

Description



The ST16C1550, ST16C1551 series (here on denoted as the 155X) is a universal asynchronous receiver and transmitter (UART). The 155X is an improved version of the SSI 73M1550 and SSI 73M2550 UART with higher operating speed and lower access time. The 155X provides enhanced UART functions with 16 byte FIFOs, a modem control interface, independent programmable baud rate generators with clock rates to 1.5 Mbps.

Onboard status registers provide the user with error indications and operational status. System interrupts and modem control features may be tailored by external software to meet specific user requirements. An internal loopback capability allows onboard diagnostics. The ST16C1551 is available in a 28-pin PLCC/plastic-DIP, 48-pin TQFP packages.

The Baud rate generator can be configured for either crystal or external clock input with the exception of the 28 pin 1551 package.

An external clock must be provided for the 28 pin ST16C1551 package. Each package type, with the exception of the 28 pin 1550, provides a buffered reset output that can be controlled through user software. DMA monitor signals TXRDY/RXRDY are not available at the 155X I/O pins but these signals are accessible through ISR register bits 4-5. Except as listed above, each package version has the same features. The 155X is functionally compatible with the 16C550. The 155X is fabricated in an advanced CMOS process to achieve low drain power and high speed requirements.

For UART technical support or to obtain an IBIS model for this product, please email Exar's UART Technical Support group.

The ST16C1550 and ST16C1551 UARTs (here on denoted as the ST16C155X) are improved versions of the SSI 73M1550 and SSI 73M2550 UART with higher operating speed and lower access time. The ST16C155X provides enhanced UART functions with 16 byte FIFOs, a modem control interface, independent programmable baud rate generators with clock rates up to 1.5 Mbps. Onboard status registers provide the user with error indications and operational status. System interrupt and modem control features may be tailored by external software to meet specific user requirements. An internal loopback capability allows onboard diagnostics. The baud rate generator can be configured for either crystal or external clock input with the exception of the 28 pin ST16C1551 package (where an external clock must be provided). Each package type, with the exception of the 28 pin ST16C155X, provides a buffered reset output that can be controlled through user software. DMA monitor signals TXRDY/RXRDY are not available at the ST16C155X I/O pins but these signals are accessible through ISR register bits 4-5. Except as listed above, all package versions have the same features. The ST16C155X is not compatible with the industry standard 16550 and will not work with the standard serial port driver in MS Windows (see pages 16-17 for details) . For an MS Windows compatible UART, see the ST16C550.