SC28L92A1BS,551 Datasheet SC28L92A1B,551, SC28L92A1B,528, SC28L92A1BS,551 | P1-P3

1. General description

The SC28L92 is a pin and function replacement for the SCC2692 and SC26C92 operating

at 3.3 V or 5 V supply with added features and deeper FIFOs. Its conﬁguration on

power-up is that of the SC26C92. Its differences from the SCC2692 and SC26C92 are:

16 character receiver, 16 character transmit FIFOs, watchdog timer for each receiver,

mode register 0 is added, extended baud rate and overall faster speeds, programmable

receiver and transmitter interrupts. (Neither the SC26C92 nor the SCC2692 is being

discontinued.)

Pin programming will allow the device to operate with either the Motorola or Intel bus

interface. The bit 3 of the MR0A register allows the device to operate in an 8 byte FIFO

mode if strict compliance with the SC26C92 FIFO structure is required.

The NXP Semiconductors SC28L92 Dual Universal Asynchronous Receiver/Transmitter

(DUART) is a single-chip CMOS-LSI communications device that provides two full-duplex

asynchronous receiver/transmitter channels in a single package. It interfaces directly with

microprocessors and may be used in a polled or interrupt driven system with modem and

DMA interface.

The operating mode and data format of each channel can be programmed independently.

Additionally, each receiver and transmitter can select its operating speed as one of 28

ﬁxed baud rates; a 16× clock derived from a programmable counter/timer, or an external

1× or 16× 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 DUART particularly attractive for

dual-speed channel applications such as clustered terminal systems.

Each receiver and transmitter is buffered by 8 or 16 character FIFOs to minimize the

potential of receiver overrun, transmitter underrun and to reduce interrupt overhead in

interrupt driven systems. In addition, a ﬂow control capability is provided via RTS/CTS

signaling to disable a remote transmitter when the receiver buffer is full.

Also provided on the SC28L92 are a multipurpose 7-bit input port and a multipurpose 8-bit

output port. These can be used as general purpose I/O ports or can be assigned speciﬁc

functions (such as clock inputs or status/interrupt outputs) under program control.

The SC28L92 is available in three package versions: PLCC44, QFP44, and HVQFN48.

SC28L92

3.3 V/5.0 V Dual Universal Asynchronous

Receiver/Transmitter (DUART)

Rev. 07 — 19 December 2007 Product data sheet

Product data sheet Rev. 07 — 19 December 2007 2 of 73

NXP Semiconductors

SC28L92

3.3 V/5.0 V Dual Universal Asynchronous Receiver/Transmitter

2. Features

n Member of IMPACT family: 3.3 V to 5.0 V, −40 °C to +85 °C and 68xxx or 80xxx bus

interface for all devices

n Dual full-duplex independent asynchronous receiver/transmitters

n 16 character FIFOs for each receiver and transmitter

n Pin programming selects 68xxx or 80xxx bus interface

n Programmable data format

u 5 data to 8 data bits plus parity

u Odd, even, no parity or force parity

u 1 stop, 1.5 stop or 2 stop bits programmable in

⁄

-bit increments

n 16-bit programmable counter/timer

n Programmable baud rate for each receiver and transmitter selectable from:

u 28 ﬁxed rates: 50 kBd to 230.4 kBd

u Other baud rates to 1 MHz at 16×

u Programmable user-deﬁned rates derived from a programmable counter/timer

u External 1× or 16× clock

n Parity, framing, and overrun error detection

n False start bit detection

n Line break detection and generation

n Programmable channel mode

u Normal (full-duplex)

u Automatic echo

u Local loopback

u Remote loopback

u Multi-drop mode (also called wake-up or 9-bit)

n Multi-function 7-bit input port (includes IACKN)

u Can serve as clock or control inputs

u Change of state detection on four inputs

u Inputs have typically > 100 kΩ pull-up resistors

u Change of state detectors for modem control

n Multi-function 8-bit output port

u Individual bit set/reset capability

u Outputs can be programmed to be status/interrupt signals

u FIFO status for DMA interface

n Versatile interrupt system

u Single interrupt output with eight maskable interrupting conditions

u Output port can be conﬁgured to provide a total of up to six separate interrupt

outputs that may be wire ORed

u Each FIFO can be programmed for four different interrupt levels

u Watchdog timer for each receiver

n Maximum data transfer rates: 1× - 1 Mbit/s, 16× - 1 Mbit/s

n Automatic wake-up mode for multi-drop applications

n Start-end break interrupt/status

n Detects break which originates in the middle of a character

Product data sheet Rev. 07 — 19 December 2007 3 of 73

NXP Semiconductors

SC28L92

3.3 V/5.0 V Dual Universal Asynchronous Receiver/Transmitter

n On-chip crystal oscillator

n Power-down mode

n Receiver time-out mode

n Single 3.3 V or 5 V power supply

n Powers up to emulate SC26C92

3. Ordering information

Table 1. Ordering information

= 3.3 V

10 % or V

= 5.0 V

10 %; T

amb

−

C to +85

Type number Package

Name Description Version

SC28L92A1A PLCC44 plastic leaded chip carrier; 44 leads SOT187-2

SC28L92A1B QFP44 plastic quad ﬂat package; 44 leads (lead length 1.3 mm);

body 10 × 10 × 1.75 mm

SOT307-2

SC28L92A1BS HVQFN48 plastic thermal enhanced very thin quad ﬂat package; no leads;

48 terminals; body 6 × 6 × 0.85 mm

SOT778-4

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24 P25-P27 P28-P30 P31-P33 P34-P36 P37-P39 P40-P42 P43-P45 P46-P48 P49-P51 P52-P54 P55-P57 P58-P60 P61-P63 P64-P66 P67-P69 P70-P72 P73-P73

SC28L92A1BS,551

Mfr. #:

Buy SC28L92A1BS,551

Manufacturer:

NXP Semiconductors

Description:

IC UART DUAL W/FIFO 48HVQFN

Lifecycle:

New from this manufacturer.

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SC28L92A1BS,551

SC28L92A1BS,551

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