MM74HC221AM

MM74HC221AM Datasheet

MM74HC221A Dual Non-Retriggerable Monostable Multivibrator

Part	Datasheet
MM74HC221AM	MM74HC221AM (pdf)

Related Parts	Information
MM74HC221AN	MM74HC221AN

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MM74HC221A Dual Non-Retriggerable Monostable Multivibrator MM74HC221A Dual Non-Retriggerable Monostable Multivibrator The MM74HC221A high speed monostable multivibrators one shots utilize advanced silicon-gate CMOS technology. They feature speeds comparable to low power Schottky TTL circuitry while retaining the low power and high noise immunity characteristic of CMOS circuits. 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 MM74HC221A can be triggered on the positive transition of the clear while A is held LOW and B is held HIGH. The MM74HC221A is a non-retriggerable, and therefore cannot be retriggered until the output pulse times out. Pulse width stability over a wide range of temperature and supply is achieved using linear CMOS techniques. The output pulse equation is simply PW = REXT CEXT where PW is in seconds, R is in ohms, and C is in farads. All inputs are protected from damage due to static discharge by diodes to VCC and ground. s Typical propagation delay 40 ns s Wide power supply range s Low quiescent current 80 µA maximum 74HC Series s Low input current 1 µA maximum s Fanout of 10 LS-TTL loads s Simple pulse width formula T = RC s Wide pulse range 400 ns to ∞ typ s Part to part variation ±5% typ s Schmitt Trigger A & B inputs enable infinite signal input rise or fall times Ordering Code: Order Number Package Number Package Description MM74HC221AM Note 1 M16A 16-Lead Small Outline Integrated Circuit SOIC , JEDEC MS-012, Narrow MM74HC221ASJ M16D 16-Lead Small Outline Package SOP , EIAJ TYPE II, 5.3mm Wide MM74HC221AN N16E 16-Lead Plastic Dual-In-Line Package PDIP , JEDEC MS-001, Wide Note 1 Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Connection Diagrams Timing Component Top View Note Pin 6 and Pin 14 must be hard-wired to GND. 2004 Fairchild Semiconductor Corporation DS005325 MM74HC221A Truth Table H = HIGH Level L = LOW Level = Transition from LOW-to-HIGH = Transition from HIGH-to-LOW = One HIGH Level Pulse = One LOW Level Pulse X = Irrelevant Logic Diagram Inputs Clear Outputs L MM74HC221A Absolute Maximum Ratings Note 2 Note 3 Supply Voltage VCC −0.5V to +7.0V DC Input Voltage VIN −1.5V to VCC+1.5V DC Output Voltage VOUT −0.5V to VCC+0.5V Clamp Diode Current IIK, IOK ±20 mA DC Output Current, per pin IOUT ±25 mA DC VCC or GND Current, per pin ICC ±50 mA Storage Temperature Range TSTG −65°C to +150°C Power Dissipation PD Note 4 600 mW S.O. Package only 500 mW Lead Temperature TL Soldering 10 seconds 260°C Recommended Operating Conditions Min Max Units

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MM74HC221A Dual Non-Retriggerable Monostable Multivibrator

MM74HC221A Dual Non-Retriggerable Monostable Multivibrator

The MM74HC221A high speed monostable multivibrators one shots utilize advanced silicon-gate CMOS technology. They feature speeds comparable to low power Schottky TTL circuitry while retaining the low power and high noise immunity characteristic of CMOS circuits.

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 MM74HC221A can be triggered on the positive transition of the clear while A is held LOW and B is held HIGH.

The MM74HC221A is a non-retriggerable, and therefore cannot be retriggered until the output pulse times out.

Pulse width stability over a wide range of temperature and supply is achieved using linear CMOS techniques. The output pulse equation is simply PW = REXT CEXT where PW is in seconds, R is in ohms, and C is in farads. All inputs are protected from damage due to static discharge by diodes to VCC and ground.
s Typical propagation delay 40 ns s Wide power supply range s Low quiescent current 80 µA maximum 74HC Series s Low input current 1 µA maximum s Fanout of 10 LS-TTL loads s Simple pulse width formula T = RC s Wide pulse range 400 ns to ∞ typ s Part to part variation ±5% typ s Schmitt Trigger A & B inputs enable infinite signal input
rise or fall times
Ordering Code:

Order Number Package Number

Package Description

MM74HC221AM Note 1

M16A
16-Lead Small Outline Integrated Circuit SOIC , JEDEC MS-012, Narrow

MM74HC221ASJ

M16D
16-Lead Small Outline Package SOP , EIAJ TYPE II, 5.3mm Wide

MM74HC221AN

N16E
16-Lead Plastic Dual-In-Line Package PDIP , JEDEC MS-001, Wide
Note 1 Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Connection Diagrams

Timing Component

Top View

Note Pin 6 and Pin 14 must be hard-wired to GND.
2004 Fairchild Semiconductor Corporation DS005325

MM74HC221A

Truth Table

H = HIGH Level L = LOW Level = Transition from LOW-to-HIGH
= Transition from HIGH-to-LOW = One HIGH Level Pulse = One LOW Level Pulse X = Irrelevant

Logic Diagram

Inputs

Clear

Outputs
L

MM74HC221A

Absolute Maximum Ratings Note 2

Note 3

Supply Voltage VCC
−0.5V to +7.0V

DC Input Voltage VIN
−1.5V to VCC+1.5V

DC Output Voltage VOUT
−0.5V to VCC+0.5V

Clamp Diode Current IIK, IOK
±20 mA

DC Output Current, per pin IOUT
±25 mA

DC VCC or GND Current, per pin ICC
±50 mA

Storage Temperature Range TSTG
−65°C to +150°C

Power Dissipation PD

Note 4
600 mW

S.O. Package only
500 mW

Lead Temperature TL Soldering 10 seconds
260°C

Recommended Operating Conditions

Min Max Units

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Datasheet ID: MM74HC221AM 634378