TC74HC221AP(F) Toshiba, TC74HC221AP(F) Datasheet - Page 2

• Manufacturer Part Number: TC74HC221AP(F)
• Manufacturer: Toshiba

Specifications of TC74HC221AP(F)

• Logic Family: HC
• High Level Output Current: -5.2mA
• Low Level Output Current: 5.2mA
• Quiescent Current: 4uA
• Number Of Elements: 2
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (max): 6V
• Operating Supply Voltage (typ): 2.5/3.3/5V
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Technology: CMOS
• Abs. Propagation Delay Time: 295ns
• Operating Supply Voltage (min): 2V
• Lead Free Status / RoHS Status: Compliant

Pin Assignment
IEC Logic Symbol
Block Diagram (Note 1)(Note 2)
Note 1: Cx, Rx, Dx are external
Note 2: External clamping diode, Dx;
capacitor, resistor, and diode, respectively.
The external capacitor is charged to V
If the supply voltage is turned off, Cx is discharges mainly through the internal (parasitic) diode. If Cx is
sufficiently large and V
current or latch-up. If the capacitance of the supply voltage filter is large enough and V
in rush current is automatically limited and damage to the IC is avoided.
The maximum value of forward current through the parasitic diode is ±20 mA.
In the case of a large Cx, the limit of fall time of the supply voltage is determined as follows:
In the even a system does not satisfy the above condition, an external clamping diode (Dx) is needed to
protect the IC from rush current.
t
(tf is the time between the supply voltage turn off and the supply voltage reaching 0.4 V
f
> = (V
CC
− 0.7) Cx/20 mA
CC
drops rapidly, there will be some possibility of damaging the IC through in rush
CC
level in the wait state, i.e. when no trigger is applied.
2
TC74HC221AP/AF/AFN
CC
drops slowly, the
CC
2007-10-01
.)