SDLS158 - DECEMBER 1978 - REVISED MARCH 1988
PRODUCTION DATA documents contain informatin current as of publicationdate. Products conform to specifications per the terms of Texas Instrumentsstandard warranty. Production processing does not necessarily include testingof all paramters.
The 'LS320 is a crystal-controlled oscillator/clock driver. It featurescomplementary standard and high-current driver outputs. A synchronizationflip-flop is included.
The driver outputs, F' and F\' have very-low impedance and canbe used to drive highly capacitive TTL-level lines. If the driver outputsare not used, then the VCC' terminal can be left open.
The 'LS321 is identical to the 'LS320 except it additionally features twocount-down outputs, F/2 and F/4.
These circuits were designed for crystal control of frequency and capacitivecontrol is not recommended. If a fundamental crystal is used, an inductorof 5 to 160 μH is required to be connected between the tank 1 and tank2 inputs. 
Interaction of the driver outputs with the other outputs limits usefulfrequencies as shown in the frequency-limits table.
The SN54LS320 and SN54LS321 are characterized for operation over the fullmilitary temperature range of -55°C to 125°C. The SN74LS320 and SN74LS321are characterized for operation from 0°C to 70°C.
View more information about generic part numbers:SN74LS320, SN74LS321
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