DAN-136 Datasheet, PDF (4/5 Pages) Exar Corporation – EXAR XR16L580 COMPARED

DATA COMMUNICATIONS APPLICATION NOTE
DAN137
2.0 SUMMARY OF DIFFERENCES BETWEEN THE XR16L580 AND TL16C550C
The differences between the XR16L580 and TL16C550C are summarized in the table below.
TABLE 3: DIFFERENCES BETWEEN EXAR’S XR16L580 AND TI’S TL16C550C
COMPARISON
Data Bus Standard
Power Supply Operation
5V Tolerant Inputs
Max Frequency on XTAL1
BRG Prescaler
Package
Extra Pins Available in XR16L580
Extra Pins Available in
TL16C550C and ST1C550
Operating Temperature Ranges
48-pin package thickness
TX/RX FIFO Size
TX/RX Trigger Tables
TX FIFO Interrupt Trigger Levels
RX FIFO Interrupt Trigger Levels
Wake-up Interrupt
Hardware Flow Control
Software Flow Control
Infrared Mode
Invert Infrared RX signal control
Sleep Mode
Low Power Mode
Diagnostic Modes
XR16L580
Intel or Motorola
2.5, 3.3 and 5 V
Yes
24 MHz @ 2.5V
33 MHz @ 3.3V
50 MHz @ 5V
1 or 4
32-QFN, 48-TQFP
16/68#, PwrSave
N/A
(RCLK is internally connected
to Baudout)
Industrial
1.2 mm (TQFP)
16
1 Trigger Table
4 Selectable
4 Selectable
Yes
Auto RTS/CTS
Flow Control
Auto Xon/Xoff
Flow Control
IrDA encoder/decoder (ver 1.0)
Yes
Sleep Mode with
Auto Wake-up
Yes (Power-Save)
Local Loopback
TL16C550C
Intel
3.3 and 5 V
No
14 MHz @ 3.3V
16 MHz @ 5V
1
44-PLCC, 48-TQFP, 40-PDIP
N/A
RCLK, CS0, CS1, Baudout, WR2, RD2,
DDIS, -TXRDY, -ADS, -RXRDY,
-OUT1, -OUT2
Commercial and Industrial
1.6 mm (LQFP)
16
1 Trigger Table
1
4 Selectable
No
Auto RTS/CTS
Flow Control
No
No
No
No
No
Local Loopback
3.0 REPLACING THE TL16C550CPT/PFB WITH THE XR16L580IM IN THE 48-TQFP PACKAGE
You can install the XR16L580IM into the TL16C550C socket with no hardware changes when using the 48-
TQFP package under these conditions: crystal oscillator frequency of 1.8432 - 14.7456 MHz, the legacy sig-
nals in Table 1 are unused and the pads for the 16/68# and PwrSave pins have no connections.
When replacing the TL16C550CPT/PFB with the XR16L580IM and if Auto RTS/CTS flow control feature is
used (MCR bit-5), the software will need to be modified since Auto RTS/CTS Hardware Flow Control is
enabled differently in the XR16L580. Also, one can take advantage of the enhanced features in the XR16L580
that are not available in the TL16C550C, like Sleep Mode with Power-Save, Automatic Xon/Xoff Software Flow
Control, and Infrared Mode.
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