XR16L580 Exar Corporation, XR16L580 Datasheet - Page 6

• Manufacturer Part Number: XR16L580
• Description: Smallest 2.25 to 5.5V Uart With 16-Byte Fifo And Power-save
• Manufacturer: Exar Corporation

XR16L580
SMALLEST 2.25V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE
The CPU interface is 8 data bits wide with 3 address lines and control signals to execute data bus read and
write transactions. The L580 data interface supports the Intel compatible types of CPUs and it is compatible to
the industry standard 16C550 UART. No clock (oscillator nor external clock) is required to operate a data bus
transaction. Each bus cycle is asynchronous using CS#, IOR# and IOW# or R/W# inputs. A typical data bus
interconnection for Intel and Motorola mode is shown in
F
2.0 FUNCTIONAL DESCRIPTIONS
2.1
IGURE
3. XR16L580 T
CPU Interface
UART_RESET#
UART_RESET
UART_IRQ#
UART_CS#
UART_CS#
UART_INT
IOW#
R/W#
IOR#
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
A2
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
A2
YPICAL
I
NTEL
/M
Motorola Data Bus Interconnections
OTOROLA
Intel Data Bus Interconnections
D
ATA
VCC
6
B
Figure
US
IOR#
IOW#
IOR#
IOW#
RESET
RESET
D0
D1
D2
D3
D4
D5
D6
D7
CS#
D0
D1
D2
D3
D4
D5
D6
D7
CS#
A0
A1
A2
A0
A1
A2
INT
INT
I
NTERCONNECTIONS
3.
PwrSave
PwrSave
16/68#
16/68#
DTR#
DSR#
DTR#
DSR#
RTS#
CTS#
RTS#
CTS#
GND
GND
CD#
CD#
VCC
VCC
RI#
RI#
TX
RX
TX
RX
VCC
VCC
RS-232 or RS-422
RS-232 or RS-422
Serial Interface of
Serial Interface of
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REV. 1.2.0