XR16L788IQ-F Exar Corporation, XR16L788IQ-F Datasheet - Page 7

• Manufacturer Part Number: XR16L788IQ-F
• Description: IC UART 64B 3.3V OCTAL 100QFP
• Manufacturer: Exar Corporation
• Type: IrDA or RS- 485r

Specifications of XR16L788IQ-F

• Number Of Channels: 8
• Package / Case: 100-BQFP
• Features: *
• Fifo's: 64 Byte
• Protocol: RS485
• Voltage - Supply: 2.97 V ~ 5.5 V
• With Auto Flow Control: Yes
• With Irda Encoder/decoder: Yes
• With False Start Bit Detection: Yes
• With Modem Control: Yes
• Mounting Type: Surface Mount
• Data Rate: 6.25 Mbps
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.97 V
• Supply Current: 5 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: 8
• Uart Features: Tx/Rx FIFO Counters
• Supply Voltage Range: 2.97V To 5.5V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: QFP
• 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: 1016-1284

REV. 1.2.3
The XR16L788 (788) integrates the functions of 8 enhanced 16550 UARTs, a general purpose 16-bit timer/
counter and an on-chip oscillator. The device configuration registers include a set of four consecutive interrupt
source registers that provides interrupt-status for all 8 UARTs, timer/counter and a sleep wake up indicator.
Each UART channel has its own 16550 UART compatible configuration register set for individual channel
control, status, and data transfer. Additionally, each UART channel has 64-byte of transmit and receive FIFOs,
automatic RTS/CTS or DTR/DSR hardware flow control with hysteresis control, automatic Xon/Xoff and special
character software flow control, programmable transmit and receive FIFO trigger levels, FIFO level counters,
infrared encoder and decoder (IrDA ver. 1.0), programmable baud rate generator with a prescaler of divide by
1 or 4, and data rate up to 6.25 Mbps with 8X sampling clock or 3.125Mbps with 16X sampling clock. The
XR16L788 is a 5V and 3.3V device with 5 volt tolerant inputs (except XTAL1).
The RST# input resets the internal registers and the serial interface outputs in all 8 channels to their default
state (see
in the device.
The internal registers of each UART can be reset by writing to the RESET register in the Device Configuration
Registers. For more details, see the RESET register description on
The UART provides the user with the capability to bi-directionally transfer information between an external
CPU and an external serial communication device. A logic 0 on the chip select pins, CS#, allows the user to
select one of the UART channels to configure, send transmit data and/or unload receive data to/from the
UART. When address line A7 = 0, address lines A6:A4 are used to select one of the eight channels. See
Table 1
During a write cycle, the setting of REGB bit-0 to a logic 1 will override the channel selection of address A6:A4
and allow a simultaneous write to all 8 UART channels when any channel is written to. This functional
capability allow the registers in all 8 UART channels to be modified concurrently, saving individual channel
initialization time. Caution should be considered, however, when using this capability. Any in-process serial
data transfer may be disrupted by changing an active channel’s mode. Also, REGB bit-0 should be reset to a
logic 0 before attempting to read from the UART.
1.0 DESCRIPTION
2.0 FUNCTIONAL DESCRIPTIONS
2.1
2.2
2.3
2.1.1
2.1.2
Device Reset
UART Channel Selection
Simultaneous Write to All Channels
below for UART channel selection.
Hardware Reset
Table
Software Reset
19). A LOW pulse of longer than 40 ns duration will be required to activate the reset function
A7
0
0
0
0
0
0
0
0
A6
0
0
0
0
1
1
1
1
T
ABLE
A5
0
0
1
1
0
0
1
1
1: UART C
A4
0
1
0
1
0
1
0
1
7
HIGH PERFORMANCE 2.97V TO 5.5V OCTAL UART
HANNEL
Channel 0 Selected
Channel 1 Selected
Channel 2 Selected
Channel 3 Selected
Channel 4 Selected
Channel 5 Selected
Channel 6 Selected
Channel 7 Selected
S
ELECTION
F
page
UNCTION
25.
XR16L788