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IK Semiconductor - Dual Monostable Binary Up/Down Counter

Numéro de référence IN74HC221A
Description Dual Monostable Binary Up/Down Counter
Fabricant IK Semiconductor 
Logo IK Semiconductor 





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IN74HC221A fiche technique
TECHNICAL DATA
IN74HC221A
Dual Monostable Multivibrator
The IN74HC221A 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
IN74HC221AN Plastic
IN74HC221AD 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
mwill be some possibility of damaging the I.C. with a surge
ocurrent or latch-up. If the voltage supply filter capacitor is
.clarge enough and VCC decrease slowly, the surge current is
uautomatically limited and damage the I.C. is avoided. The
t4maximum forward current of the parasitic diode is
www.datasheeapproximately 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
1

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