DAN-123 Datasheet, PDF (2/3 Pages) Exar Corporation – EXAR’S XR88C92/192 COMPARED

DATA COMMUNICATIONS APPLICATION NOTE
DAN123
1.4 SUMMARY OF DIFFERENCES
In the table below, some differences between the XR88C92/192 and SCC2692 are summarized.
TABLE 1: DIFFERENCES BETWEEN EXAR’S XR88C92/192 WITH PHILIPS’S SCC2692
DIFFERENCES
Data Bus Standard
Power Supply Operation
Max Operating Current
Max Frequency on XTAL1
Max Data Rate
Operating Temperature Range
Package
44-(T)QFP package thickness
44-(T)QFP package max lead lengths
TX FIFO Size
RX FIFO Size
TX FIFO Trigger Levels
RX FIFO Trigger Levels
XR88C92/192
Intel
3.3 and 5 V
3 mA @ 3.3 V
6 mA @ 5 V
24 MHz
1 Mbps
Commercial and Industrial
44-TQFP, 44-PLCC,
40-PDIP
1.4 mm
0.75 mm
8 (XR88C92)
16 (XR88C192)
8 (XR88C92)
16 (XR88C192)
8, 4, 6, 1 (XR88C92)
16, 8, 12, 1(XR88C192)
1, 3, 6, 8 (XR88C92)
1, 6, 12, 16 (XR88C192)
SCC2692
Intel
5 V only
10 mA @ 5 V
4 MHz
125 Kbps
Commercial and Industrial
44-PQFP, 44- PLCC,
40-PDIP, 28-DIP
1.75 mm
0.95 mm
1
3
1
1, 3
1.5 REPLACING THE SCC2692 WITH THE XR88C92/192
You can directly replace the Philips SCC2692 with Exar’s XR88C92/192 without any hardware changes if us-
ing either the 44-TQFP, 44-PLCC or 40-PDIP packages. Hardware changes will be necessary to upgrade from
the 28-DIP package because the XR88C92/192 is not available in that package.
Since the XR88C92/192 has a larger Transmit and Receive FIFO, the software will need to be updated to take
advantage of the features of the XR88C92/192. The XR88C92/192 allows the hardware designer to choose ei-
ther a 5 or 3.3 V power supply instead of being forced to use a 5 V power supply only. Also, the XR88C92/192
has a lower power consumption than the SCC68692.
The XR88C92/192 can accept up to a 24 MHz frequency on XTAL1 and is capable of operating up to a data
rate of 1 Mbps whereas the SCC2692 can only accept up to a 4 MHz frequency on XTAL1 and only operating
up to a data rate of 125 Kbps.
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