SC28C94A1A: Quad universal asynchronous receiver/transmitter (QUART)

The 28C94 quad universal asynchronous receiver/transmitter (QUART) combines four enhanced Philips Semiconductors industry-standard UARTs with an innovative interrupt scheme that can vastly minimize host processor overhead. It is implemented using Philips Semiconductors' high-speed CMOS process that combines small die size and cost with low power consumption.

The operating speed of each receiver and transmitter can be selected independently at one of eighteen fixed baud rates, a 16X clock derived from a programmable counter/timer, or an external 1X or 16X clock. The baud rate generator and counter/timer can operate directly from a crystal or from external clock inputs. The ability to independently program the operating speed of the receiver and transmitter make the QUART particularly attractive for dual-speed channel applications such as clustered terminal systems.

Each receiver is buffered with eight character FIFOs (first-in-first-out memories) and one shift register to minimize the potential for receiver overrun and to reduce interrupt overhead in interrupt driven systems. In addition, a handshaking capability is provided to disable a remote UART transmitter when the receiver buffer is full. (RTS control)

The 28C94 provides a power-down mode in which the oscillator is stopped and the register contents are stored. This results in reduced power consumption on the order of several magnitudes. The QUART is fully TTL compatible and operates from a single +5V power supply.

SC28C94A1A: Product Block Diagram

sot238-2_3d

Data Sheets (1)

Name/Description	Modified Date
Quad universal asynchronous receiver/transmitter (QUART) (REV 3.0) PDF (231.0 kB) SC28C94	09 Aug 2006

Application Notes (3)

Name/Description	Modified Date
Application of UART in GPS navigation system (REV 1.0) PDF (84.0 kB) AN10353	01 Mar 2005
UART to Bluetooth interfacing (REV 2.0) PDF (205.0 kB) AN10307	11 Aug 2004
AN10251 (REV 2.0) PDF (38.0 kB) AN10251	27 Oct 2003

Brochures (1)

Name/Description	Modified Date
NXP® High-speed UARTs and Bridge ICs (REV 1.0) PDF (5.7 MB) 75017552	03 Apr 2014

Package Information (1)

Name/Description	Modified Date
plastic leaded chip carrier; 52 leads (REV 1.0) PDF (458.0 kB) SOT238-2	08 Feb 2016

Supporting Information (1)

Name/Description	Modified Date
Footprint for wave soldering (REV 1.0) PDF (10.0 kB) PLCC-WAVE	08 Oct 2009

Ordering Information

Product	Status	Package version	Application	Operating Temperature (Cel)	Number of pins	Receiver/Transmitter type	Function
SC28C94A1A	Active	SOT238-2	Data Communication	-40~85	52	Quad UARTs	Receivers/Transmitters
SC28C94A1A/S900	No Longer Manufactured	SOT238-2	Data Communication	-40~85	52	Quad UARTs	Receivers/Transmitters
SC28C94A1A/CP2121	No Longer Manufactured	SOT238-2	Data Communication	-40~85	52	Quad UARTs	Receivers/Transmitters

Package Information

Product ID	Package Description	Outline Version	Reflow/Wave Soldering	Packing	Product Status	Part NumberOrdering code(12NC)	Marking	Chemical Content	RoHS / Pb Free / RHF	LeadFree Conversion Date	EFR	IFR(FIT)	MTBF(hour)	MSL	MSL LF
SC28C94A1A		SOT238-2	PLCC-WAVE	Tube in Drypack	Active	SC28C94A1A,512 (9352 625 34512)	SC28C94A1A	SC28C94A1A		week 8, 2005	0.0	6.0	1.67E8	3	3
SC28C94A1A		SOT238-2	PLCC-WAVE	Reel 13" Q1/T1 in Drypack	Active	SC28C94A1A,518 (9352 625 34518)	SC28C94A1A	SC28C94A1A		week 8, 2005	0.0	6.0	1.67E8	3	3