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IDT74FCT191 Datasheet

FAST CMOS UP/DOWN BINARY COUNTER

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®
Integrated Device Technology, Inc.
FAST CMOS
UP/DOWN BINARY
COUNTER
IDT54/74FCT191
IDT54/74FCT191A
FEATURES:
• IDT54/74FCT191 equivalent to FASTspeed
IDT54/74FCT191A 35% faster than FAST
• Equivalent to FAST output drive over full temperature
and voltage supply extremes
• IOL = 48mA (commercial), 32mA (military)
• CMOS power levels (1mW typ. static)
• CMOS output level compatible
• Substantially lower input current levels than FAST
(5µA max.)
• JEDEC standard pinout for DIP, LCC and SOIC
• Product available in Radiation Tolerant and Radiation
Enhanced versions
• Military product compliant to MIL-STD-883, Class B
DESCRIPTION:
The IDT54/74FCT191 and IDT54/74FCT191A are
reversible modulo-16 binary counters, featuring synchronous
counting and asynchronous presetting and are built using an
advanced dual metal CMOS technology. The preset feature
allows the IDT54/74FCT191 and IDT54/74FCT191A to be
used in programmable dividers. The count enable input,
terminal count output and ripple clock output make possible a
variety of methods of implementing multiusage counters. In
the counting modes, state changes are initiated by the rising
edge of the clock.
FUNCTIONAL BLOCK DIAGRAMS
CP U/D
P0 CE
P1
P2
P3 PL
RC TC
J CLOCK K
PRESET
CLEAR
QQ
Q0
J CLOCK K
PRESET
CLEAR
QQ
Q1
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
FAST is a trademark of National Semiconductor Co.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
©1994 Integrated Device Technology, Inc.
7.6
J CLOCK K
PRESET
CLEAR
QQ
Q2
J CLOCK K
PRESET
CLEAR
QQ
Q3
2616 drw 01
MAY 1992
DSC-4614/3
1


Integrated Device Technology Electronic Components Datasheet

IDT74FCT191 Datasheet

FAST CMOS UP/DOWN BINARY COUNTER

No Preview Available !

IDT54/74FCT191/A
FAST CMOS UP/DOWN BINARY COUNTER
PIN CONFIGURATIONS
P1
Q1
Q0
CE
U/D
Q2
Q3
GND
1 16
2 15
3 D16-1, 14
4
P16-1,
E16-1,
13
5 & 12
6 S016-1 11
7 10
89
Vcc
P0
CP
RC
TC
PL
P2
P3
DIP/SOIC/CERPACK
TOP VIEW
*MR FOR ‘161
MILITARY AND COMMERCIAL TEMPERATURE RANGES
INDEX
Q0
CE
NC
U/D
Q2
3 2 20 19
4 1 18
5 17
6 L20-2 16
7 15
8 14
9 10 11 12 13
CP
RC
NC
TC
PL
LCC
TOP VIEW
*SR FOR ‘163
2616 drw 02
PIN DESCRIPTION
Pin Names
CE
Description
Count Enable Input (Active LOW)
CP Clock Pulse Input (Active Rising Edge)
P0-3 Parallel Data Inputs
PL Asynchronous Parallel Load Input (Active LOW)
U/D Up/Down Count Control Input
Q0-3
Flip-Flop Outputs
RC Ripple Clock Output (Active LOW)
TC Terminal Count Output (Active HIGH)
2616 tbl 05
RC FUNCTION TABLE(2)
Inputs
CE
CP
L
HX
XX
TC(1)
H
X
L
Outputs
RC
H
H
2616 tbl 06
MODE SELECT FUNCTION TABLE(2)
Inputs
PL CE U/D CP
Mode
H L L Count Up
H L H Count Down
L X X X Preset (Asynchronous)
H H X X No Change (Hold)
NOTES:
2616 tbl 07
1. TC is generated internally.
2. H = HIGH Voltage Level, L = LOW Voltage Level, X = Don’t Care,
= LOW-to-HIGH clock transition.
7.6 2


Part Number IDT74FCT191
Description FAST CMOS UP/DOWN BINARY COUNTER
Maker IDT
Total Page 8 Pages
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