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TC74HC191AF 参数 Datasheet PDF下载

TC74HC191AF图片预览
型号: TC74HC191AF
PDF下载: 下载PDF文件 查看货源
内容描述: 4位二进制加/减计数器 [4-Bit Binary Up/Down Counter]
分类和应用: 计数器
文件页数/大小: 12 页 / 442 K
品牌: TOSHIBA [ TOSHIBA SEMICONDUCTOR ]
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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.
TC74HC191AP
TC74HC191AF
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
Weight
DIP16-P-300-2.54A
SOP16-P-300-1.27A
: 1.00 g (typ.)
: 0.18 g (typ.)
Pin Assignment
1
2007-10-01