LS7213R、LS7213R-S

FEATURES:
•  Eight timing ranges   •  Four modes
•  RC controlled on-chip oscillator
•  Power-On-Reset (POR)
•  Reset input for delay abort
•  Complementary outputs
•  Delay-in-Progress Indicator output
•  LS7213R (DIP), LS7213R-S (SOIC) 

APPLICATIONS

Time delay relays for HVAC equipment and industrial controls.
DESCRIPTION
The LS7213R is a CMOS integrated circuit for generating pro-
grammable time-delays. The delay is initiated by a logic transition
at the Trigger input and the completion of the delay is marked by a
change of status at the Out1 and the Out2 outputs. Three inputs,
D1, D2 and D3 select 1-of-8 scale factors, s. The delay, td is related
to s by the expression, td = s/frc, where frc is the frequency at the
RC input produced by an internal oscillator. An external resistor-
capacitor pair connected to the RC pin controls the oscillator fre-
quency. There are four modes of operation selected by inputs A
and B. The operating modes are: