74VHC221A − Dual Non-Retriggerable Monostable Multivibrator

The VHC221A is an advanced high speed CMOS Monostable Multivibrator fabricated with silicon gate CMOS technology. It achieves the high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissipation. Each multivibrator features both a negative, A, and a positive, B, transition triggered input, either of which can be used as an inhibit input. Also included is a clear input that when taken LOW resets the one-shot. The VHC221A can be triggered on the positive transition of the clear while A is held LOW and B is held HIGH. The VHC221A is non-retriggerable, and therefore cannot be retriggered until the output pulse times out. The output pulse width is determined by the equation:     PW = (Rx)(Cx); where PW is in seconds, R is in ohms, and C is in farads.     Limits for R_x and C_x are: External capacitor, C_x: No limit External resistors, R_x:V_CC= 2.0V, 5 kohm min V_CC > 3.0V, 1 kohm min     An input protection circuit ensures that 0 to 7V can be applied to the input pins without regard to the supply voltage. This device can be used to interface 5V to 3V systems and two supply systems such as battery back up. This circuit prevents device destruction due to mismatched supply and input voltages.

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Product Status/Pricing/Packaging

Index	Product	Product & Eco Status	*Pricing	Packaging & Packing Info	**Package Marking Convention	Qualification Support	Compliance Certificates
0	74VHC221AM	Full Production ROHS Compliant	$0.2508	SO 16L NB Details SO 16L NB Drawing  RAIL	Line 1:$Y (Fairchild logo) &Z (Plant Code) &2 (2-Digit Date Code) &K Line 2:74VHC221A	Moisture Sensitivity Level (MSL) :  1   Max Reflow Temp :  260	RoHS IPC1752 RoHS/REACH/JIG RoHS/REACH/JIG
0	74VHC221AMX	Full Production ROHS Compliant	$0.4437	SO 16L NB Details SO 16L NB Drawing  TAPE REEL	Line 1:$Y (Fairchild logo) &Z (Plant Code) &2 (2-Digit Date Code) &K Line 2:74VHC221A	Moisture Sensitivity Level (MSL) :  1   Max Reflow Temp :  260	RoHS IPC1752 RoHS/REACH/JIG RoHS/REACH/JIG
0	74VHC221AMTCX	Full Production Green as of Jul 2011	$0.2508	TSSOP 16L Details TSSOP 16L Drawing  TAPE REEL	Line 1:$Y (Fairchild logo) &Z (Plant Code) &2 (2-Digit Date Code) &K Line 2:V221A	Moisture Sensitivity Level (MSL) :  1   Max Reflow Temp :  260	RoHS IPC1752 RoHS/REACH/JIG RoHS/REACH/JIG
0	74VHC221AMTC	Full Production Green as of Jul 2011	$0.2508	TSSOP 16L Details TSSOP 16L Drawing  RAIL	Line 1:$Y (Fairchild logo) &Z (Plant Code) &2 (2-Digit Date Code) &K Line 2:V221A	Moisture Sensitivity Level (MSL) :  1   Max Reflow Temp :  260	RoHS IPC1752 RoHS/REACH/JIG RoHS/REACH/JIG

• Fairchild 1,000 piece Budgetary Pricing. *
• If there is no sample button displayed at the top of the page, please contact one of the Fairchild distributors or your local sales office to obtain samples.
• Top mark packaging information for product 74VHC221A is available. **

Features

• High Speed: t_PD = 8.1 ns (typ) at V_CC = 5V
• Low Power Dissipation: I_CC = 4 µA (Max) at T_A = 25°C
• Active State: I_CC = 600 µA (Max) at T_A = 25°C
• High Noise Immunity: V_NIH = V_NIL = 28% V_CC (min)
• Power down protection is provided on all inputs
• Pin and function compatible with 74HC221A

Applications

Server & Mainframe Workstation Desktop PC Notebook PC PC Server Media Tablets Storage & Peripherals Printer Graphic Card LCD Monitor CRT/RPTV

Other Data Processing Routers & LAN Switches SAN Long-haul & Metro Broadband Access Broadband Modem Enterprise Voice Network Central Office Broadcast & Studio Other Wired Communications Mobile Handsets

Wireless LAN Card & Broadband Access Wireless LAN Access Point/Router Mobile Comm Infrastructure Other Wireless Communications PMP/MP3 Players Home Audio System Components CRT/RPTV LCD TV PDP TV Camcorder DVD

Set Top Boxes DSC Video Game Console E-book Reader Consumer Appliances Other Audio & Video Other Consumer Electronics Medical Electronics/Devices Automation Test and Measurement Building & Home Control

Other Industrial

Application Notes