DAN-122 Datasheet, PDF (2/3 Pages) Exar Corporation – EXAR’S XR68C681 COMPARED

DATA COMMUNICATIONS APPLICATION NOTE
DAN122
1.3 SUMMARY OF DIFFERENCES
In the table below, some differences between the XR68C681 and SCC68692 are summarized.
TABLE 2: DIFFERENCES BETWEEN EXAR’S XR68C681 WITH PHILIPS’S SCC68692
DIFFERENCES
Data Bus Standard
Power Supply Operation
Max Operating Current
Max Frequency on XTAL1
Max Data Rate
Operating Temperature Range
Package
TX FIFO Size
RX FIFO Size
TX FIFO Trigger Levels
RX FIFO Trigger Levels
XR68C681
Motorola
5 V only
15 mA @ 5 V
7.372 MHz
250 Kbps
Commercial and Industrial
44-PLCC, 40-PDIP, 40-CDIP
1
3
1
1, 3
SCC68692
Motorola
5 V only
10 mA @ 5 V
4 MHz
125 Kbps
Commercial and Industrial
44-PLCC, 40-PDIP, 40-CDIP
1
3
1
1, 3
1.4 REPLACING THE SCC68692 WITH THE XR68C681
You can directly replace the Philips SCC68692 with Exar’s XR68C681 without any hardware changes.
The only hardware-related difference is that the XR68C681 can accept up to a 7.372 MHz frequency on XTAL1
and is capable of operating up to a data rate 250 Kbps whereas the SCC68692 can only accept up to a 4 MHz
frequency on XTAL1 and only operating up to a data rate of 125 Kbps.
2