900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Renesas Electronics Components Datasheet

HD74LS191P Datasheet

Synchronous Up / Down 4-bit Binary Counter

No Preview Available !

HD74LS191
Synchronous Up / Down 4-bit Binary Counter (single clock line)
REJ03D0453–0200
Rev.2.00
Feb.18.2005
Synchronous operation is provided by having all flip-flops clocked simultaneously so that the steering logic. This mode
of operation eliminates the output counting spikes normally associated with asynchronous (ripple clock) counters. The
outputs of the four master-slave flip-flops are triggered on a low-to-high-level transition of the clock input if the enable
input is high. The direction of the count is determined by the level of the down / up input. When low, the counter
counts up and when high, it counts down. Level changes at the down / up input should be made only when the clock
input is high. This counter is fully programmable; that is, the outputs may be preset to either level by placing a low on
the load input and entering the desired data at the data inputs. The output will change to agree with the data inputs
independently of the level of the clock input. This feature allows the counters to be used as modulo-N dividers by
simply modifying the count length with the preset inputs. The clock, down / up, and load inputs are buffered to lower
the drive requirement which significantly reduces the number of clock drivers, etc., required for long parallel words.
Two outputs have been made available to perform the cascading function; ripple clock and made available to perform
the cascading function; ripple clock and maximum / minimum count. The latter output produces a high-level output
pulse with a duration approximately equal to one complete cycles to the clock when the counter overflows or
underflows. The ripple clock output produces a low-level output pulse equal in width to the low-level portion of the
clock input when an overflow or underflow condition exists.
The counters can be easily cascaded by feeding the ripple clock output to the enable input of the succeeding counter if
parallel clocking is used, or to the clock input if parallel enabling is used. The maximum / minimum count output can
be used to accomplish look-ahead for high-speed operation.
Features
Ordering Information
Part Name
Package Type
Package Code
(Previous Code)
Package
Abbreviation
HD74LS191P
DILP-16 pin
PRDP0016AE-B
(DP-16FV)
P
HD74LS191FPEL SOP-16 pin (JEITA)
PRSP0016DH-B
FP
(FP-16DAV)
Note: Please consult the sales office for the above package availability.
Taping Abbreviation
(Quantity)
EL (2,000 pcs/reel)
Rev.2.00, Feb.18.2005, page 1 of 10


Renesas Electronics Components Datasheet

HD74LS191P Datasheet

Synchronous Up / Down 4-bit Binary Counter

No Preview Available !

HD74LS191
Pin Arrangement
Data B
Input
1
Outputs
QB 2
QA 3
Enable G 4
Inputs
Down/Up 5
Outputs
QC 6
QD 7
GND 8
B
QB
A
QA
CK
G
Ripple
Clock
Dn/Up
Max/
Min
QC
Load
QD
C
D
(Top view)
16 VCC
15 Data A
14 Clock
13
Ripple
Clock
12 Max/Min
11 Load
10 Data C
9 Data D
Inputs
Outputs
Inputs
Rev.2.00, Feb.18.2005, page 2 of 10


Part Number HD74LS191P
Description Synchronous Up / Down 4-bit Binary Counter
Maker Renesas
PDF Download

HD74LS191P Datasheet PDF






Similar Datasheet

1 HD74LS191 Synchronous Up/Down 4-bit Binary Counters
Hitachi Semiconductor
2 HD74LS191 Synchronous Up / Down 4-bit Binary Counter
Renesas
3 HD74LS191P Synchronous Up / Down 4-bit Binary Counter
Renesas





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z



Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy