High Precision Monostable

Hi All.
We are working on a project where we need a very stable monostable to
produce 5 microsecond pulses every time an input pulses arrive. We
have tried IC 74123 and 74221 integrated circuits but the pulse width
is not stable enough. Does anyone know a circuit or integrated circuit
that produce high stable pulse width?. We need 5 microsecond pulses +-
0.01%. Actually we work in a range from 1 to 10 microsecond pulse
width.
Thanks for your help or advice.
Sergio
.

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