TinyINT(M) always has a range from -128..+127 signed or 0..255 unsigned. M is the display width.
M indicates the maximum display width for integer types. The maximum
display width is 255. Display width is unrelated to the range of
values a type can contain, as described in Section 11.2, “Numeric
Types”. For floating-point and fixed-point types, M is the total
number of digits that can be stored.
from http://dev.mysql.com/doc/refman/5.5/en/numeric-type-overview.html