MC74HC244A
http://onsemi.com
3
MAXIMUM RATINGS
Symbol Parameter Value Unit
VCC DC Supply Voltage (Referenced to GND) – 0.5 to + 7.0 V
Vin DC Input Voltage (Referenced to GND) – 0.5 to VCC + 0.5 V
Vout DC Output Voltage (Referenced to GND) – 0.5 to VCC + 0.5 V
Iin DC Input Current, per Pin ±20 mA
Iout DC Output Current, per Pin ±35 mA
ICC DC Supply Current, VCC and GND Pins ±75 mA
IIK Input Clamp Current (VI < 0 or VI > VCC)±20 mA
IOK Output Clamp Current (VO < 0 or VO > VCC)±20 mA
PDPower Dissipation in Still Air, Plastic DIP†
SOIC Package†
TSSOP Package†
750
500
450
mW
Tstg Storage Temperature – 65 to + 150 _C
TLLead Temperature, 1 mm from Case for 10 Seconds
(Plastic DIP, SOIC, SSOP or TSSOP
Package)
260
_C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress
ratings only. Functional operation above the Recommended Operating Conditions is not implied.
Extended exposure to stresses above the Recommended Operating Conditions may affect device
reliability.
†Derating — Plastic DIP: – 10 mW/_C from 65_ to 125_C
SOIC Package: – 7 mW/_C from 65_ to 125_C
TSSOP Package: − 6.1 mW/_C from 65_ to 125_C
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Min Max Unit
VCC DC Supply Voltage (Referenced to GND) 2.0 6.0 V
Vin, Vout DC Input Voltage, Output Voltage (Referenced to GND) 0 VCC V
TAOperating Temperature, All Package Types – 55 + 125 _C
tr, tfInput Rise and Fall Time VCC = 2.0 V
(Figure 1) VCC = 4.5 V
VCC = 6.0 V
0
0
0
1000
500
400
ns
DC ELECTRICAL CHARACTERISTICS (Voltages Referenced to GND)
Guaranteed Limit
Symbol Parameter Test Conditions
VCC
V
– 55 to
25_Cv 85_Cv 125_CUnit
VIH Minimum High−Level Input Voltage Vout = VCC – 0.1 V
|Iout| v 20 mA
2.0
3.0
4.5
6.0
1.5
2.1
3.15
4.2
1.5
2.1
3.15
4.2
1.5
2.1
3.15
4.2
V
VIL Maximum Low−Level Input Voltage Vout = 0.1 V
|Iout| v 20 mA
2.0
3.0
4.5
6.0
0.5
0.9
1.35
1.8
0.5
0.9
1.35
1.8
0.5
0.9
1.35
1.8
V
VOH Minimum High−Level Output
Voltage
Vin = VIH
|Iout| v 20 mA
2.0
4.5
6.0
1.9
4.4
5.9
1.9
4.4
5.9
1.9
4.4
5.9
V
Vin = VIH |Iout| v 2.4 mA
|Iout| v 6.0 mA
|Iout| v 7.8 mA
3.0
4.5
6.0
2.48
3.98
5.48
2.34
3.84
5.34
2.2
3.7
5.2
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 cir-
cuit. For proper operation, Vin and
Vout should be constrained to the
range GND v (Vin or Vout) v 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.