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鈩?/div>
High Speed CMOS Presettable Synchronous
4-Bit Binary Counters
Product Features
聲 PI74FCT191/2191T is pin compatible with bipolar FAST聶
Series at a higher speed and lower power consumption
聲 25鈩?series resistor on all outputs (FCT2XXX only)
聲 TTL input and output levels
聲 Low ground bounce outputs (25鈩?series only)
聲 Extremely low static power
聲 Hysteresis on all inputs
聲 Industrial operating temperature range: 聳40擄C to +85擄C
聲 Packages available:
聳 16-pin 150 mil wide plastic QSOP (Q)
聳 16-pin 300 mil wide plastic SOIC (S)
Product Description
Pericom Semiconductor聮s PI74FCT series of logic circuits are
produced in the Company聮s advanced 0.6 micron CMOS
technology, achieving industry leading speed grades. All
PI74FCT2XXX devices have a built-in 25 ohm series resistor on
all outputs to reduce noise due to reflections, thus eliminating the
need for an external terminating resistor.
The PI74FCT191T is a high speed CMOS 4-bit binary up/down
counter. It has a single clock with clock enable and up/down
control inputs and ripple carry output. The 191 has asynchronous
preload inputs which override the count inputs. All inputs have
clamp diodes for undershoot noise suppression. All outputs have
ground bounce suppression.
Logic Block Diagram
U/D
CE
D
0
-D
3
PL
CP
Cup
Q+Cup
- Cdn
Cdn
=F
=0
Q
3
-Q
0
25鈩?/div>
(FCT2XXX ONLY)
鈩?/div>
TC
25鈩?/div>
(FCT2XXX ONLY)
鈩?/div>
RC
25鈩?/div>
(FCT2XXX ONLY)
next
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