TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic
Synchronous Presettable 4-Bit Counter
TC74VHC161F/FK Binary, Asynchronous Clear
TC74VHC163F/FK Binary, Synchronous Clear
The TC74VHC 161 and 163 are advanced high speed CMOS
SYNCHRONOUS PRESETTABLE 4 BIT BINARY COUNTERs
fabricated with silicon gate C2MOS technology.
They achieve the high speed operation similar to equivalent Bipolar
Schottky TTL 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 each IC’s is synchronous to the rising edge of CK.
The clear function of the TC74VHC163 is synchronous to CK, while the
TC74VHC161 are cleared asynchronously.
Two enable inputs (ENP and ENT) and CARRY OUTPUT are provided
to enable easy cascading of counters, which facilitates easy
implementation of n-bit counters without using external gates.
An input protection circuit ensures that 0 to 5.5 V can be applied to the
input pins without regard to the supply voltage. This device can be used
to interface 5 V to 3 V systems and two supply systems such as battery
back up. This circuit prevents device destruction due to mismatched
supply and input voltages.
: 0.18 g (typ.)
: 0.02 g (typ.)
High speed: fmax = 185 MHz (typ.) at VCC = 5 V
Low power dissipation: ICC = 4 μA (max) at Ta = 25°C
High noise immunity: VNIH = VNIL = 28% VCC (min)
Power down protection is provided on all inputs.
Balanced propagation delays: tpLH ∼− tpHL
Wide operating voltage range: VCC (opr) = 2 to 5.5 V
Low noise: VOLP = 0.8 V (max)
Pin and function compatible with 74ALS161/163
Toshiba Electronic Devices & Storage Corporation
Start of commercial production