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SN74LS279A: what's the initial status of output?

Part Number: SN74LS279A

Hi,

my customer need a device to achieve:

their system will generate a low pulse duration of 10us. They need a device to output low at the falling edge of the 10us low pulse, and keep low after the 10us pulse is gone, and will return to high when I give a reset signal to the device.

Do we have such devices?

RS latch seems to be able to fulfill the task, but we don't know the initial status of Q when the device is powered up.

If we have other devices can meet the requirement, please inform me, thanks.