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LS7212

Part Number	LS7212
Manufacturer	LSI Computer Systems
Description	PROGRAMMABLE DIGITAL DELAY TIMER
Published	Apr 25, 2005
Detailed Description	LSI/CSI UL ® LS7211-7212 (631) 271-0400 FAX (631) 271-0405 June 1997 LSI Computer Systems, Inc. 1235 Walt Whitman Road...
Datasheet	LS7212 PDF File

Overview

LSI/CSI UL ® LS7211-7212 (631) 271-0400 FAX (631) 271-0405 June 1997 LSI Computer Systems, Inc.
1235 Walt Whitman Road, Melville, NY 11747 A3800 PROGRAMMABLE DIGITAL DELAY TIMER 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 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.
The time delay is initiated by a transition of the Trigger Input (TRIG).
I/O DESCRIPTION: 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 SS (-V) OUT 1 2 18 17 16 15 14 13 12 11 10 TRIG WB0 WB1 WB2 WB3 WB4 WB5 WB6 WB7 3 4 5 6 7 8 9 LSI LS7212 FIGURE 1 Each input has an internal pull-up resistor of about 500KΩ.
One-Shot Mode (OS) A positive transition at the TRIG input causes OUT to switch low without delay and starts the delay timer.
At the end of the programmed delay timeout, OUT switches high.
If a ...

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