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PI74FCT191T Datasheet(PDF) 1 Page - Pericom Semiconductor Corporation

Part No. PI74FCT191T
Description  High Speed CMOS Presettable Synchronous 4-Bit Binary Counters
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Maker  PERICOM [Pericom Semiconductor Corporation]
Homepage  http://www.pericom.com
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PI74FCT191T Datasheet(HTML) 1 Page - Pericom Semiconductor Corporation

   
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1
PS2084B
01/13/97
Product Description
Pericom Semiconductor’s PI74FCT series of logic circuits are
produced in the Company’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
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
Product Features
• PI74FCT191/2191T is pin compatible with bipolar FAST™
Series at a higher speed and lower power consumption
•25
Ω series resistor on all outputs (FCT2XXX only)
• TTL input and output levels
• Low ground bounce outputs (25
Ω series only)
• Extremely low static power
• Hysteresis on all inputs
• Industrial operating temperature range: –40°C to +85°C
• Packages available:
– 16-pin 150 mil wide plastic QSOP (Q)
– 16-pin 300 mil wide plastic SOIC (S)
PI74FCT191T
(25
Ω Series) PI74FCT2191T
High Speed CMOS Presettable Synchronous
4-Bit Binary Counters
CE
Q3-Q0
PL
CP
U/D
TC
RC
25
Ω (FCT2XXX ONLY)
25
Ω (FCT2XXX ONLY)
D0-D3
25
Ω (FCT2XXX ONLY)
=F
=0
Cup
Q+Cup
- Cdn
Cdn


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