LSI Computer Systems LS7213
The LS7213 is a monolithic CMOS integrated circuit for generating programmable 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. The delay, td is related to s by the expression, td = s/f rc, where f rc is the frequency at the RC input produced by an internal oscillator.| Part No. | LS7213 |
|---|---|
| Datasheet | LS7213 Download |
| Manufacturer |  LSI Computer Systems |
| Description | PROGRAMMABLE DIGITAL DELAY TIMER |
| Buy | Stock & Price |
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
● LS7213 (DIP), LS7213-S (SOIC) - See Figure 1
APPLICATIONS
Time delay relays for HVAC equipment and industrial controls.DESCRIPTION
Three inputs, D1, D2 and D3 select 1-of-8 scale factors, s. An external resistor-capacitor pair connected to the RC pin controls the oscillator frequency. There are four modes of operation selected by inputs A and B. The operating modes are: On-Delay (OND), Off-Delay (OFD), Dual-Delay (DLD) and OneShot(OST). These modes are described below: On-Delay (OND) Mode A positive transition at the Trigger input starts the on-delay timer. At the end of the delay Out1 switches low and Out2 switches high. A negative transition at the Trigger input immediately aborts any ondelay in progress. If the Trigger input is switched low, Out1 if low will switch high and Out2 if high will switch low without delay.
