TC74HC191AP_07 Datasheet, PDF (1/12 Pages) Toshiba Semiconductor – 4-Bit Binary Up/Down Counter

TC74HC191AP/AF
TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic
TC74HC191AP,TC74HC191AF
4-Bit Binary Up/Down Counter
The TC74HC191A are high speed CMOS 4-BIT UP/DOWN
COUNTERs fabricated with silicon gate C2MOS technology.
It achieves the high speed operation similar to equivalent
LSTTL while maintaining the CMOS low power dissipation.
The TC74HC191A is 4-bit binary up/down counter.
They have an asynchronous load input (LOAD) which is active
low.
The direction of counting is determined by the level of
DOWN/UP. When D/U is low, the counter counts up; when D/U is
high, it counts down. Counting occurs on the positive going
transition of the clock input.
Enable input (ENABLE) and two carry inputs (RIPPLE
CLOCK OUT, MAX/MIN) are provided to permit easy cascading
of the 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.
Features
• High speed: fmax = 48 MHz (typ.) at V_CC = 5 V
• Low power dissipation: I_CC = 4 μA (max) at Ta = 25°C
• High noise immunity: V_NIH = V_NIL = 28% V_CC (min)
• Output drive capability: 10 LSTTL loads
• Symmetrical output impedance: |I_OH| = I_OL = 4 mA (min)
• Balanced propagation delays: t_pLH ^∼− t_pHL
• Wide operating voltage range: V_CC (opr) = 2~6 V
• Pin and function compatible with 74LS191
Pin Assignment
TC74HC191AP
TC74HC191AF
Weight
DIP16-P-300-2.54A
SOP16-P-300-1.27A
: 1.00 g (typ.)
: 0.18 g (typ.)
1
2007-10-01