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IK Semiconductor

IN74HC123A Datasheet Preview

IN74HC123A Datasheet

Dual Monostable Multivibrator with Reset

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TECHNICAL DATA
IN74HC123A
Dual Retriggerable Monostable
Multivibrator
The IN74HC123A is identical in pinout to the LS/ALS123. 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 CLR 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 RX and capacitor CX. Taking CLR 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
ORDERING INFORMATION
IN74HC123AN Plastic
IN74HC123AD SOIC
TA = -55° to 125° C for all packages
PIN ASSIGNMENT
LOGIC DIAGRAM
PIN 16 =VCC
PIN 8 = GND
Note
(1) CX, RX, DX are external components.
(2) DX 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
A B CLR
HH
Outputs
QQ
X L H L* H*
H X H L* H*
LH
LH
XX L L H
X = don’t care
* - except for monostable period
Note
Output
Enable
Inhibit
Inhibit
Output
Enable
Output
Enable
Inhibit
1




IK Semiconductor

IN74HC123A Datasheet Preview

IN74HC123A Datasheet

Dual Monostable Multivibrator with Reset

No Preview Available !

IN74HC123A
MAXIMUM RATINGS*
Symbol
Parameter
Value
VCC
VIN
VOUT
IIN
IOUT
ICC
PD
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, CLR
CX, RX
DC Output Current, per Pin
DC Supply Current, VCC and GND Pins
Power Dissipation in Still Air, Plastic DIP+
SOIC Package+
-0.5 to +7.0
-1.5 to VCC +1.5
-0.5 to VCC +0.5
±20
±30
±25
±50
750
500
Tstg Storage Temperature
-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
VCC
VIN, VOUT
TA
Parameter
DC Supply Voltage (Referenced to GND)
DC Input Voltage, Output Voltage (Referenced to GND)
Operating Temperature, All Package Types
Min
3.0 **
0
-55
Max
6.0
VCC
+125
Unit
V
V
°C
tr, tf Input Rise and Fall Time - CLR
(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 µF
Limit
** The In74HC123 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 IN74HC123A
Description Dual Monostable Multivibrator with Reset
Maker IK Semiconductor
Total Page 7 Pages
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