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IK Semiconductor

IN74HC221A Datasheet Preview

IN74HC221A Datasheet

Dual Monostable Binary Up/Down Counter

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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




IK Semiconductor

IN74HC221A Datasheet Preview

IN74HC221A Datasheet

Dual Monostable Binary Up/Down Counter

No Preview Available !

IN74HC221A
MAXIMUM RATINGS*
Symbol
VCC
VIN
VOUT
IIN
IOUT
ICC
PD
Tstg
Parameter
DC Supply Voltage (Referenced to GND)
DC Input Voltage (Referenced to GND)
DC Output Voltage (Referenced to GND)
DC Input Current, per Pin
A, B, RESET
CEXT, REXT
DC Output Current, per Pin
DC Supply Current, VCC and GND Pins
Power Dissipation in Still Air, Plastic DIP**
SOIC Package**
Storage Temperature
Value
-0.5 to +7.0
-1.5 to VCC +1.5
-0.5 to VCC +0.5
±20
±30
±25
±50
750
500
-65 to +150
TL Lead Temperature, 1 mm from Case for 10 Seconds
(Plastic DIP or SOIC Package)
260
*Maximum Ratings are those values beyond which damage to the device may occur.
Functional operation should be restricted to the Recommended Operating Conditions.
**Derating - Plastic DIP: - 10 mW/°C from 65° to 125°C
SOIC Package: : - 7 mW/°C from 65° to 125°C
Unit
V
V
V
mA
mA
mA
mW
°C
°C
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Min Max Unit
VCC
VIN, VOUT
TA
DC Supply Voltage (Referenced to GND)
DC Input Voltage, Output Voltage (Referenced to GND)
Operating Temperature, All Package Types
3.0 * 6.0
V
0 VCC V
-55
+125
°C
tr, tf Input Rise and Fall Time - RESET
(Figure 2)
A or B
VCC =2.0 V
VCC =4.5 V
VCC =6.0 V
0
1000
ns
0 500
0 400
- No Limit
RX External Timing Resistor
VCC <4.5 V
VCC 4.5 V
10
1000
k
2.0 1000
CX External Timing Capacitor
0 No Limit µF
* The IN74HC221A will function at 2.0 V but for optimum pulse width stability, VCC should be above
3.0 V.
This device contains protection circuitry to guard against damage due to high static voltages or electric fields.
However, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this
high-impedance circuit. For proper operation, VIN and VOUT should be constrained to the range GND(VIN or
VOUT)VCC.
Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or VCC). Unused
outputs must be left open.
2


Part Number IN74HC221A
Description Dual Monostable Binary Up/Down Counter
Maker IK Semiconductor
Total Page 7 Pages
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