Fan out current of a 555?

[450nm]

Does anyone know what this is offhand? A quick Google doesn't show it.

I'm using a 555 to give the lasers a test 50-50 duty cycle and just wondering how many I can drive from one chip without adding a tranisitor to up the current.

TIA

[mixedgas]

Does anyone know what this is offhand? A quick Google doesn't show it.

I'm using a 555 to give the lasers a test 50-50 duty cycle and just wondering how many I can drive from one chip without adding a tranisitor to up the current.

TIA

Fairchild NE55 data sheet says this

Low Output Voltage VOL
VCC = 15V
ISINK = 50mA
VCC = 5V
ISINK = 5mA - 0.05 0.35 V

High Output Voltage VOH
VCC = 15V
ISOURCE = 200mA
VCC = 5V
ISOURCE = 100mA

depending on which 555 you have its between 2 and 8 LS TTL for the fanout

I often end up adding a 1K pullup to 5V on pin 3 when driving old TTL.