LSI Computer Systems LS7211
The LS7211/LS7212 are monolithic CMOS integrated circuits for generating digitally programmable delays. The delay is controlled by 8 binary weighted inputs, WB0-WB7, in conjunction with an applied clock or oscillator frequency. The programmed time delay manifests itself in the Delay Output (OUT) as a function of the Operating Mode selected by the Mode Select inputs A and B: One-Shot, Delayed Operate, Delayed Release or Dual Delay.| Part No. | LS7211 |
|---|---|
| Datasheet | LS7211 Download |
| Manufacturer |  LSI Computer Systems |
| Description | PROGRAMMABLE DIGITAL DELAY TIMER |
| Buy | Stock & Price |
FEATURES
:● 8-bit programmable delay from nanoseconds to days
● On chip oscillator (RC or Crystal) or external clock time base
● Selectable prescaler for real time delay generation based on 50Hz/60Hz time base or 32.768KHz watch crystal
● Four operating modes
● Reset input for delay abort
● Low quiescent and operating current
● Direct relay drive
● +4V to +18V operation (VDD-VSS)
● LS7211/LS7212 (DIP), LS7211-S/LS7212-S (SOIC)-See Figure 1
DESCRIPTION
: The time delay is initiated by a transition of the Trigger Input (TRIG). I/ODESCRIPTION
: MODE SELECT Inputs (A &B, Pins 1 & 2) The 4 operating modes are selected by Inputs A and B according to Table 1 TABLE 1. MODE SELECTION A 0 0 1 1 B 0 1 0 1 MODE One-Shot (OS) Delayed Operate (DO) Delayed Release (DR) Dual Delay (DD) A B V DD (+V) RC/CLOCK RCS/CLKS PSCLS RESET V SS (-V) OUT 1 2 3 18 17 16 PIN ASSIGNMENT - TOP VIEW TRIG WB0 WB1 WB2 WB3 WB4 WB5 WB6 WB7 LSI LS7211 4 5 6 7 8 9 15 14 13 12 11 10 A B V DD (+V) XTLI/CLOCK XTLO PSCLS RESET V...
