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IZ74HC221AZ Fiches technique(PDF) 1 Page - Integral Corp. |
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IZ74HC221AZ Fiches technique(HTML) 1 Page - Integral Corp. |
1 / 7 page IN74HC221A 1 DUAL MONOSTABLE MULTIVIBRATOR The IN74HC221A is identical in pinout to the LS/ALS221. The device inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LS/ALSTTL outputs. There are two trigger inputs, A INPUT (negative edge) and B INPUT (positive edge). These inputs are valid for rising/falling signals The device may also be triggered by using the RESET input (positive-edge) because of the Schmitt-trigger input; after triggering the output maintains the MONOSTABLE state for the time period determined by the external resistor REXT and capacitor CEXT. Taking RESET low breaks this MONOSTABLE STATE. If the next trigger pulse occurs during the MONOSTABLE period it makes the MONOSTABLE period longer. • Outputs Directly Interface to CMOS, NMOS, and TTL • Operating Voltage Range: 3.0 to 6.0 V • Low Input Current: 1.0 µA • High Noise Immunity Characteristic of CMOS Devices N SUFFIX PLASTIC D SUFFIX SOIC 1 16 1 16 ORDERING INFORMATION IN74HC221AN Plastic IN74HC221AD SOIC IZ74HC221AZ Chip TA = -55° to 125° C for all packages PIN ASSIGNMENT Note (1) CEXT, REXT, DEXT are external components. (2) DEXT is a clamping diode. The external capacitor is charged to VCC in the stand-by state, i.e. no trigger. When the supply voltage is turned off CX is discharged mainly through an internal parasitic diode. If CX is sufficiently large and VCC decreases rapidy, there will be some possibility of damaging the I.C. with a surge current or latch-up. If the voltage supply filter capacitor is large enough and VCC decrease slowly, the surge current is automatically limited and damage the I.C. is avoided. The maximum forward current of the parasitic diode is approximately 20 mA. LOGIC DIAGRAM PIN 16 =VCC PIN 8 = GND FUNCTION TABLE Inputs Outputs Note A B RESET Q Q H H Output Enable X L H L * H * Inhibit H X H L * H * Inhibit L H Output Enable L H Output Enable X X L L H Inhibit X = don’t care * - except for monostable period 1 2 3 5 4 6 7 8 16 15 14 13 12 11 10 9 GND VCC 1R /C EXT EXT 1C EXT 1Q 2Q 2RESET 2B 2A 1A 1B 1RESET 1Q 2Q 2C EXT 2R /C EXT EXT C EXT R EXT D EXT C EXT R EXT D EXT |
Numéro de pièce similaire - IZ74HC221AZ |
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Description similaire - IZ74HC221AZ |
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