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PDF KK74HC221A Data sheet ( Hoja de datos )
| Número de pieza | KK74HC221A | |
| Descripción | Dual Monostable Multivibrator | |
| Fabricantes | KODENSHI KOREA | |
| Logotipo |  |
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TECHNICAL DATA
Dual Monostable Multivibrator
KK74HC221A
The KK74HC221A 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
16
1 D SUFFIX
16 SOIC
1
ORDERING INFORMATION
KK74HC221AN Plastic
KK74HC221AD SOIC
TA = -55° to 125° C for all packages
PIN ASSIGNMENT
LOGIC DIAGRAM
CEXT
DEXT
REXT
CEXT
DEXT
REXT
1A
1B
1RESET
1Q
2Q
2CEXT
2REXT/CEXT
GND
1
2
3
4
5
6
7
8
16 VCC
15 1REXT/CEXT
14 1CEXT
13 1Q
12 2Q
11 2RESET
10 2B
9 2A
PIN 16 =VCC
PIN 8 = GND
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.
FUNCTION TABLE
Inputs
Outputs
A B RESET Q Q
HH
X L H L* H*
H X H L* H*
LH
LH
XX
L
LH
X = don’t care
* - except for monostable period
Note
Output
Enable
Inhibit
Inhibit
Output
Enable
Output
Enable
Inhibit
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KK74HC221A
Figure 1. Switching Waveforms
RESET
Figure 2. Switching Waveforms
Figure 3. Test Circuit
5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet KK74HC221A.PDF ] | |
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