I downloaded the datasheet for the STM32F101x4, I did not know your exact part, should be similar. In the datasheet is a table for the I/O. I think your SLA is most likely TTL compatible, according to the ST32 datasheet, (see attached table) it outputs TTL/CMOS compliant voltage levels which means you should not need any extra interface. If you can breadboard it for a test, I would try it. Bottom line, I think your good to go.
Output voltage levels
Unless otherwise specified, the parameters given in Table 35 are derived from tests
performed under the ambient temperature and VDD supply voltage conditions summarized
in Table 8.
All I/Os are CMOS and TTL compliant.
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