TC74HC161,163AP/AF
TOSHIBA CMOS Digital Integrated Circuit
Silicon Monolithic
TC74HC161AP, TC74HC161AF
TC74HC163AP, TC74HC163AF
Synchronous Presettable 4-Bit Counter
TC74HC161AP/AF
Binary, Asynchronous
Clear
TC74HC163AP/AF
Binary, Synchronous
Clear
The TC74HC161A and 163A are high speed CMOS BINARY
PRESETTABLE COUNTERs fabricated with silicon gate C2MOS
technology.
They achieve the high speed operation similar to equivalent
LSTTL while maintaining the CMOS low power dissipation.
The CK input is active on the rising edge. Both LOAD and
CLR inputs are active on low logic level.
Presetting of their IC’s is synchronous to the rising edge of CK.
The clear function of the TC74HC163A is synchronous to CK,
while the TC74HC161A is cleared asynchronously.
Two enable inputs (ENP and ENT) and CO are provided to
enable easy cascading of counters, which facilitates easy
implementation of n-bit counters without using external gates.
All inputs are equipped with protection circuits against static
discharge or transient excess voltage.
TC74HC161AP, TC74HC163AP
TC74HC161AF, TC74HC163AF
Weight
DIP16-P-300-2.54A
SOP16-P-300-1.27A
Features
•
High speed: fmax = 63 MHz (typ.) at VCC = 5 V
•
: 1.00 g (typ.)
: 0.18 g (typ.)
Low power dissipation: ICC = 4 μA (max) at Ta = 25°C
•
High noise immunity: VNIH = VNIL = 28% VCC (min)
•
Output drive capability: 10 LSTTL loads
•
Symmetrical output impedance: |IOH| = IOL = 4 mA (min)
Balanced propagation delays: tpLH ∼ tpHL
−
•
•
Wide operating voltage range: VCC (opr) = 2 to 6 V
•
Pin and function compatible with 74LS161, 163
Pin Assignment
Start of commercial production
1986-05
1
2014-03-01
