XR16L580IL-F Exar Corporation, XR16L580IL-F Datasheet - Page 10

• Manufacturer Part Number: XR16L580IL-F
• Description: UART Interface IC UART
• Manufacturer: Exar Corporation

Specifications of XR16L580IL-F

• Data Rate: 1 Mbps
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.25 V
• Supply Current: 3 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Package / Case: QFN
• No. Of Channels: 1
• Uart Features: Selectable RX And TX FIFO Trigger Levels, Automatic Software Flow Control, Complete Modem Interface
• Supply Voltage Range: 2.25V To 5.5V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

XR16L580
SMALLEST 2.25V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE
The L580 includes an on-chip oscillator (XTAL1 and XTAL2) to generate a clock when a crystal is connected
between the XTAL1 and XTAL2 pins of the device. Alternatively, an external clock can be supplied through the
XTAL1 pin. The CPU data bus does not require this clock for bus operation. The crystal oscillator provides a
system clock to the Baud Rate Generators (BRG) section. XTAL1 is the input to the oscillator or external clock
input and XTAL2 pin is the bufferred output which can be used as a clock signal for other devices in the
system. Please note that the input XTAL1 is not 5V tolerant and therefore, the maximum voltage at the pin
should be VCC when an external clock is supplied. For programming details, see “Programmable Baud Rate
Generator.”
F
The on-chip oscillator is designed to use an industry standard microprocessor crystal (parallel resonant,
fundamental frequency with 10-22 pF capacitance load, ESR of 20-120 ohms and 100ppm frequency
tolerance) connected externally between the XTAL1 and XTAL2 pins (see Figure 5). When VCC = 5V, the on-
chip oscillator can operate with a crystal whose frequency is not greater than 24 MHz. On the other hand, the
L580 can accept an external clock of up to 50MHz at XTAL1 pin, with a 2K ohms pull-up resistor on XTAL2 pin
(as shown in
2.8
IGURE
(16/68# = 1)
(16/68# = 0)
IRQ# Pin
INT Pin
5. T
Crystal or External Clock Input
YPICAL
Figure 6
0 = no data
1 = 1 byte
1 = no data
0 = 1 byte
C
RYSTAL CONNECTIONS
). This translates to a maximum of 3.125Mbps serial data rate at 5V.
(FIFO D
FCR B
T
ABLE
IT
ISABLED
-0 = 0
2: INT (IRQ#) P
)
22-47pF
XTAL1
C1
0 = FIFO below trigger level
1 = FIFO above trigger level
1 = FIFO below trigger level
0 = FIFO above trigger level
500K - 1M
IN
R2
22-47pF
10
XTAL2
O
C2
Y1
PERATION
1.8432 MHz
(Optional)
24 MHz
0-120
R1
to
F
OR
(FIFO E
R
FCR B
ECEIVER
IT
NABLED
-0 = 1
)
REV. 1.4.1