BINARY COUNTER. CY74FCT191T Datasheet

CY74FCT191T COUNTER. Datasheet pdf. Equivalent

Part CY74FCT191T
Description 4-BIT UP/DOWN BINARY COUNTER
Feature CY74FCT191T 4-BIT UP/DOWN BINARY COUNTER D Function, Pinout, and Drive Compatible With FCT and F Lo.
Manufacture etcTI
Total Page 20 Pages
Datasheet
Download CY74FCT191T Datasheet



CY74FCT191T
CY74FCT191T
4-BIT UP/DOWN BINARY COUNTER
D Function, Pinout, and Drive Compatible
With FCT and F Logic
D Reduced VOH (Typically = 3.3 V) Versions
of Equivalent FCT Functions
D Edge-Rate Control Circuitry for
Significantly Improved Noise
Characteristics
D Ioff Supports Partial-Power-Down Mode
Operation
D ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
– 1000-V Charged-Device Model (C101)
D Matched Rise and Fall Times
D 64-mA Output Sink Current
32-mA Output Source Current
SCCS016A – MAY 1994 – REVISED SEPTEMBER 2001
Q OR SO PACKAGE
(TOP VIEW)
P1
Q1
Q0
CE
U/D
Q2
Q3
GND
1
2
3
4
5
6
7
8
16 VCC
15 P0
14 CP
13 RC
12 TC
11 PL
10 P2
9 P3
description
The CY74FCT191T is a reversible modulo-16 binary counter, featuring synchronous counting and
asynchronous presetting. The preset allows the CY74FCT191T 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.
This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.
NAME
CE
CP
P
PL
U/D
Q
RC
TC
PIN DESCRIPTION
DESCRIPTION
Count enable input (active low)
Clock pulse input (active rising edge)
Parallel data inputs
Asynchronous parallel load input (active low)
Up/down count control input
Flip-flop outputs
Ripple clock output (active low)
Terminal count output
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright 2001, Texas Instruments Incorporated
1



CY74FCT191T
CY74FCT191T
4-BIT UP/DOWN BINARY COUNTER
SCCS016A MAY 1994 REVISED SEPTEMBER 2001
ORDERING INFORMATION
TA
PACKAGE
SPEED
(ns)
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
QSOP Q Tape and reel
6.2 CY74FCT191CTQCT
FT191-3
40°C to 85°C
Tube
SOIC SO
Tape and reel
6.2 CY74FCT191CTSOC
FCT191C
6.2 CY74FCT191CTSOCT
Tube
SOIC SO
Tape and reel
7.8 CY74FCT191ATSOC
FCT191A
7.8 CY74FCT191ATSOCT
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
Function Tables
RC FUNCTION
INPUTS
CE CP
OUTPUTS
TCRC
LH
HXX
XXL
H = High logic level, L = Low logic level,
X = Dont care, = Low pulse
TC is generated internally.
H
H
MODE SELECT
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)
H = High logic level, L = Low logic level, X = Dont care,
= Low-to-high clock transition
2 POST OFFICE BOX 655303 DALLAS, TEXAS 75265





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