ST16C2552IJ44-F Exar Corporation, ST16C2552IJ44-F Datasheet - Page 17
![IC UART FIFO 16B DUAL 44PLCC](/photos/29/6/290692/plcc44_sml.jpg)
ST16C2552IJ44-F
Manufacturer Part Number
ST16C2552IJ44-F
Description
IC UART FIFO 16B DUAL 44PLCC
Manufacturer
Exar Corporation
Type
RS- 232 or RS- 485r
Specifications of ST16C2552IJ44-F
Number Of Channels
2, DUART
Package / Case
44-LCC (J-Lead)
Features
*
Fifo's
16 Byte
Protocol
RS232, RS485
Voltage - Supply
3.3 V ~ 5 V
With False Start Bit Detection
Yes
With Modem Control
Yes
With Cmos
Yes
Mounting Type
Surface Mount
Data Rate
4 Mbps
Supply Voltage (max)
5.5 V
Supply Voltage (min)
2.97 V
Supply Current
3 mA
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Operating Supply Voltage
3.3 V or 5 V
No. Of Channels
2
Supply Voltage Range
2.97V To 5.5V
Operating Temperature Range
-40°C To +85°C
Digital Ic Case Style
PLCC
No. Of Pins
44
Filter Terminals
SMD
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Other names
1016-1258-5
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ST16C2552IJ44-F
Manufacturer:
Exar Corporation
Quantity:
135
Company:
Part Number:
ST16C2552IJ44-F
Manufacturer:
IDT
Quantity:
4 795
Company:
Part Number:
ST16C2552IJ44-F
Manufacturer:
Exar Corporation
Quantity:
10 000
REV. 4.2.2
The Baud Rate Generator (BRG) is a 16-bit counter that generates the data rate for the transmitter. The rate is
programmed through registers DLL and DLM which are only accessible when LCR bit-7 is set to ‘1’.
SEE”PROGRAMMABLE BAUD RATE GENERATOR” ON PAGE 10.
The Interrupt Enable Register (IER) masks the interrupts from receive data ready, transmit empty, line status
and modem status registers. These interrupts are reported in the Interrupt Status Register (ISR).
When the receive FIFO (FCR BIT-0 = 1) and receive interrupts (IER BIT-0 = 1) are enabled, the RHR interrupts
(see ISR bits 2 and 3) status will reflect the following:
A. The receive data available interrupts are issued to the host when the FIFO has reached the programmed
B. FIFO level will be reflected in the ISR register when the FIFO trigger level is reached. Both the ISR register
C. The receive data ready bit (LSR BIT-0) is set as soon as a character is transferred from the shift register to
When FCR BIT-0 equals a logic 1 for FIFO enable; resetting IER bits 0-3 enables the ST16C2552 in the FIFO
polled mode of operation. Since the receiver and transmitter have separate bits in the LSR either or both can
be used in the polled mode by selecting respective transmit or receive control bit(s).
A. LSR BIT-0 indicates there is data in RHR or RX FIFO.
B. LSR BIT-1 indicates an overrun error has occurred and that data in the FIFO may not be valid.
C. LSR BIT 2-4 provides the type of receive data errors encountered for the data byte in RHR, if any.
D. LSR BIT-5 indicates transmit FIFO is empty.
E. LSR BIT-6 indicates when both the transmit FIFO and TSR are empty.
F. LSR BIT-7 indicates a data error in at least one character in the RX FIFO.
IER[0]: RHR Interrupt Enable
The receive data ready interrupt will be issued when RHR has a data character in the non-FIFO mode or when
the receive FIFO has reached the programmed trigger level in the FIFO mode.
•
•
IER[1]: THR Interrupt Enable
This bit enables the Transmit Ready interrupt which is issued whenever the TX FIFO becomes empty.
•
•
IER[2]: Receive Line Status Interrupt Enable
If any of the LSR register bits 1, 2, 3 or 4 is a logic 1, it will generate an interrupt to inform the host controller
about the error status of the current data byte in FIFO. LSR bit-1 generates an interrupt immediately when the
character has been received. LSR bits 2-4 generate an interrupt when the character with errors is read out of
the FIFO.
•
•
4.3
4.4
4.4.1
4.4.2
Logic 0 = Disable the receive data ready interrupt (default).
Logic 1 = Enable the receiver data ready interrupt.
Logic 0 = Disable Transmit Ready interrupt (default).
Logic 1 = Enable Transmit Ready interrupt.
Logic 0 = Disable the receiver line status interrupt (default).
Logic 1 = Enable the receiver line status interrupt.
trigger level. It will be cleared when the FIFO drops below the programmed trigger level.
status bit and the interrupt will be cleared when the FIFO drops below the trigger level.
the receive FIFO. It is reset when the FIFO is empty.
Baud Rate Generator Divisors (DLL and DLM) - Read/Write
Interrupt Enable Register (IER) - Read/Write
IER versus Receive FIFO Interrupt Mode Operation
IER versus Receive/Transmit FIFO Polled Mode Operation
17
2.97V TO 5.5V DUAL UART WITH 16-BYTE FIFO
for more details.
ST16C2552