LS7213

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


Application

·Time delay relays for HVAC equipment and industrial controls.


Pinout




Specifications

	SYMBOL	VALUE	UNIT
DC Supply Voltage	VDD - VSS	+7	V
Any Input Voltage	VIN	VSS -.3 to VDD +.3	V
Operating temperature	TA	-20 to +85
Storage temperature	TSTG	-65 to +150

Description

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. Three inputs, D1, D2 and D3 select 1-of-8 scale factors, s. LS7213, 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 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 One- Shot(OST). These modes are described below: