The CD74HC221, and CH74HCT221 are dual monostable
multivibrators with reset. An external resistor (R
external capacitor (C
for the circuit. Adjustment of R
range of output pulse widths from the Q and
Pulse triggering on the B input occurs at a particular voltage
level and is not related to the rise and fall time of the trigger
pulse.
Once triggered, the outputs are independent of further trigger
inputs on
LOW level on the Reset (
and leading-edge-triggering (B) inputs are provided for
triggering from either edge of the input pulse. On power up,
the IC is reset. If either Mono is not used each input (on the
unused device) must be terminated either high or low.
The minimum value of external resistance, R
The minimum value of external capacitance, C
calculation for the pulse width is t
A and B. The output pulse can be terminated by a
) control the timing and the accuracy
X
R) pin. Trailing Edge triggering (A)
and CXprovides a wide
X
, is typically 500Ω.
X
= 0.7 RXCX at VCC = 4.5V.
W
Ordering Information
PART NUMBER TEMP. RANGE (oC) PACKAGE
CD74HC221E-55 to 12516 Ld PDIPE16.3
CD74HCT221E-55 to 12516 Ld PDIPE16.3
CD74HC221M-55 to 12516 Ld SOICM16.15
CD74HCT221M-55 to 12516 Ld SOICM16.15
NOTES:
1. When ordering, use the entire partnumber. Add the suffix 96 to
obtain the variant in the tape and reel.
2. Wafer or die are available which meets all electrical
specifications. Please contact your local sales office or Harris
customer service for ordering information.
) and an
X
Q terminals.
, is 0pF. The
X
PKG.
NO.
Pinout
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright
NOTE:
H = High Voltage Level,L = Low VoltageLevel,X = Irrelevant, ↑ = Transitionfrom Low
to High Level,↓ = Transition from High to Low Level, = One High Level Pulse,
= One Low Level Pulse
3. For this combination the reset input must be low and the following sequence must
be used: pin 1 (or 9) must be set high or pin 2 (or 10) set low; then pin 1 (or 9)
must be low and pin 2 (or 10) set high. Now the reset input goes from low-to-high
and the device will be triggered.
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE:
4. θJA is measured with the component mounted on an evaluation PC board in free air.
T exas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty . Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
CERT AIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER
CRITICAL APPLICA TIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERST OOD TO
BE FULLY AT THE CUSTOMER’S RISK.
In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
semiconductor products or services might be or are used. TI’s publication of information regarding any third
party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.
Copyright 1999, Texas Instruments Incorporated
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