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CD74HC221 Datasheet(Fiches technique) 1 Page - Texas Instruments

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Numéro de pièce CD74HC221
Description  High Speed CMOS Logic Dual Monostable Multivibrator with Reset
Télécharger  11 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
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1
Data sheet acquired from Harris Semiconductor
SCHS166A
Features
• Overriding RESET Terminates Output Pulse
• Triggering from the Leading or Trailing Edge
• Q and Q Buffered Outputs
• Separate Resets
• Wide Range of Output-Pulse Widths
• Schmitt Trigger on B Inputs
• Fanout (Over Temperature Range)
- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
• Wide Operating Temperature Range . . . -55oC to 125oC
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL
Logic ICs
• HC Types
- 2V to 6V Operation
- High Noise Immunity: NIL = 30%, NIH = 30% of VCC
at VCC = 5V
• HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility,
VIL= 0.8V (Max), VIH = 2V (Min)
- CMOS Input Compatibility, Il ≤ 1µA at VOL, VOH
Description
The CD74HC221, and CH74HCT221 are dual monostable
multivibrators with reset. An external resistor (RX) and an
external capacitor (CX) control the timing and the accuracy
for the circuit. Adjustment of RX and CX provides a wide
range of output pulse widths from the Q and Q terminals.
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 A and B. The output pulse can be terminated by a
LOW level on the Reset (R) pin. Trailing Edge triggering (A)
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, RX, is typically 500Ω.
The minimum value of external capacitance, CX, is 0pF. The
calculation for the pulse width is tW = 0.7 RXCX at VCC = 4.5V.
Pinout
CD74HC221, CD74HCT221
(PDIP, SOIC)
TOP VIEW
Ordering Information
PART NUMBER
TEMP. RANGE (oC)
PACKAGE
PKG.
NO.
CD74HC221E
-55 to 125
16 Ld PDIP
E16.3
CD74HCT221E
-55 to 125
16 Ld PDIP
E16.3
CD74HC221M
-55 to 125
16 Ld SOIC
M16.15
CD74HCT221M
-55 to 125
16 Ld SOIC
M16.15
NOTES:
1. When ordering, use the entire part number. 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.
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
1A
1B
1R
1Q
2Q
2CX
GND
2CXRX
VCC
1CX
1Q
2Q
2R
2B
2A
1CXRX
November 1997 - Revised April 1999
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright
© Harris Corporation 1997
CD74HC221,
CD74HCT221
High Speed CMOS Logic
Dual Monostable Multivibrator with Reset
File Number
1670.1
[ /Title
(CD74
HC221
,
CD74
HCT22
1)
/Sub-
ject
(High
Speed
CMOS
Logic
Dual
Monos
table
Multi-




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