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LS7212N

Part Number	LS7212N
Manufacturer	LSI
Description	PROGRAMMABLE DIGITAL DELAY TIMER
Published	May 27, 2016
Detailed Description	LSI/CSI LS7211N-7212N U® L LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 (631) 271-0400 FAX (6...
Datasheet	LS7212N PDF File

Overview

LSI/CSI LS7211N-7212N U® L LSI Computer Systems, Inc.
1235 Walt Whitman Road, Melville, NY 11747 (631) 271-0400 FAX (631) 271-0405 A3800 PROGRAMMABLE DIGITAL DELAY TIMER July 2009 FEATURES: • 8-bit programmable delay from microseconds 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 32,768Hz watch crystal • Four operating modes • Reset input for delay abort • Low quiescent and operating current • Direct relay drive • +3V to +18V operation (VDD - VSS) • LS7211N, LS7212N (DIP); LS7211N-S, LS7212N-S (SOIC) - See Figure 1 DESCRIPTION: The LS7211N and LS7212N are 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).
PIN ASSIGNMENT - TOP VIEW A1 B V DD (+V) 2 3 RC/CLOCK 4 RCS/CLKS PSCLS 5 6 RESET 7 V SS (-V) OUT 8 9 LS7211N LSI 18 TRIG 17 WB0 16 WB1 15 WB2 14 WB3 13 WB4 12 WB5 11 WB6 10 WB7 A1 B2 18 TRIG 17 WB0 LS7212N LSI 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 V DD (+V) 3 XTLI/CLOCK XTLO 4 5 16 WB1 15 WB2 14 WB3 TABLE 1.
MODE SELECTION A B MODE 0 0 One-Shot (OS) 0 1 Delayed Operate (DO) 1 0 Delayed Release (DR) 1 1 Dual Delay (DD) PSCLS 6 RESET 7 V SS (-V) 8 OUT 9 FIGURE 1 13 WB4 12 WB5 11 WB6 10 WB7 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...

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