DM54LS191W [NSC]

Synchronous 4-Bit Up/Down Counters with Mode Control; 同步4位加/减计数器,模式控制
DM54LS191W
型号: DM54LS191W
厂家: National Semiconductor    National Semiconductor
描述:

Synchronous 4-Bit Up/Down Counters with Mode Control
同步4位加/减计数器,模式控制

计数器
文件: 总8页 (文件大小:168K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
May 1989  
DM54LS190/DM74LS190, DM54LS191/DM74LS191  
Synchronous 4-Bit Up/Down Counters with Mode Control  
General Description  
These circuits are synchronous, reversible, up/down coun-  
ters. The LS191 is a 4-bit binary counter and the LS190 is a  
BCD counter. Synchronous operation is provided by having  
all flip-flops clocked simultaneously, so that the outputs  
change simultaneously when so instructed by the steering  
logic. This mode of operation eliminates the output counting  
spikes normally associated with asynchronous (ripple clock)  
counters.  
Two outputs have been made available to perform the cas-  
cading function: ripple clock and maximum/minimum count.  
The latter output produces a high-level output pulse with a  
duration approximately equal to one complete cycle of 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 accom-  
plish look-ahead for high-speed operation.  
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 low. A high at the enable input inhibits count-  
ing. Level changes at either the enable input or the down/  
up input should be made only when the clock 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.  
Features  
Y
Counts 8-4-2-1 BCD or binary  
Y
Single down/up count control line  
These counters are 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 independent of the level of the clock in-  
put. This feature allows the counters to be used as modulo-  
N dividers by simply modifying the count length with the  
preset inputs.  
Y
Count enable control input  
Y
Ripple clock output for cascading  
Y
Asynchronously presettable with load control  
Y
Parallel outputs  
Y
Cascadable for n-bit applications  
Y
Average propagation delay 20 ns  
The clock, down/up, and load inputs are buffered to lower  
the drive requirement; which significantly reduces the num-  
ber of clock drivers, etc., required for long parallel words.  
Y
Typical clock frequency 25 MHz  
Y
Typical power dissipation 100 mW  
Connection Diagram  
Dual-In-Line-Package  
TL/F/6405-1  
Order Number DM54LS190J, DM54LS191J, DM54LS190W,  
DM54LS191W, DM74LS190M, DM74LS191M, DM74LS190N, or DM74LS191N  
See NS Package Number  
J16A, M16A, N16A or W16A  
C
1995 National Semiconductor Corporation  
TL/F/6405  
RRD-B30M105/Printed in U. S. A.  
Absolute Maximum Ratings (Note)  
If Military/Aerospace specified devices are required,  
please contact the National Semiconductor Sales  
Office/Distributors for availability and specifications.  
Note: The ‘‘Absolute Maximum Ratings’’ are those values  
beyond which the safety of the device cannot be guaran-  
teed. The device should not be operated at these limits. The  
parametric values defined in the ‘‘Electrical Characteristics’’  
table are not guaranteed at the absolute maximum ratings.  
The ‘‘Recommended Operating Conditions’’ table will define  
the conditions for actual device operation.  
Supply Voltage  
Input Voltage  
7V  
7V  
Operating Free Air Temperature Range  
DM54LS  
DM74LS  
b
b
a
55 C to 125 C  
§
0 C to 70 C  
§
a
§
§
a
65 C to 150 C  
Storage Temperature Range  
§
§
Recommended Operating Conditions  
DM54LS190, LS191  
DM74LS190, LS191  
Symbol  
Parameter  
Units  
Min  
4.5  
2
Nom  
Max  
Min  
Nom  
Max  
V
V
V
Supply Voltage  
5
5.5  
4.75  
2
5
5.25  
V
V
CC  
High Level Input Voltage  
Low Level Input Voltage  
High Level Output Current  
Low Level Output Current  
Clock Frequency (Note 4)  
IH  
0.7  
0.8  
V
IL  
b
b
0.4  
I
I
0.4  
mA  
mA  
MHz  
OH  
OL  
4
8
f
0
20  
0
25  
35  
20  
0
20  
CLK  
W
t
Pulse Width  
(Note 4)  
Clock  
Load  
25  
35  
20  
0
ns  
t
t
t
Data Setup Time (Note 4)  
Data Hold Time (Note 4)  
ns  
ns  
ns  
SU  
H
Enable Time to Clock (Note 4)  
Free Air Operating Temperature  
30  
30  
0
EN  
b
T
A
55  
125  
70  
C
§
’LS190 and ’LS191 Electrical Characteristics  
over recommended operating free air temperature range (unless otherwise noted)  
Typ  
Symbol  
Parameter  
Conditions  
Min  
Max  
Units  
(Note 1)  
e
e
e b  
e
b
1.5  
V
V
Input Clamp Voltage  
V
Min, I  
Min, I  
18 mA  
V
I
CC  
I
High Level Output  
Voltage  
V
V
Max  
Min  
DM54  
DM74  
DM54  
DM74  
DM74  
Enable  
Others  
Enable  
Others  
Enable  
Others  
DM54  
DM74  
2.5  
2.7  
3.4  
3.4  
OH  
CC  
OH  
e
e
Max, V  
IL  
IH  
V
V
e
e
e
e
Min  
V
OL  
Low Level Output  
Voltage  
V
CC  
Min, I  
Max  
0.25  
0.35  
0.25  
0.4  
OL  
Max, V  
IH  
V
IL  
0.5  
0.4  
0.3  
0.1  
60  
e
e
Min  
I
4 mA, V  
CC  
OL  
@
Input Current Max  
e
CC  
I
I
I
I
I
V
Max  
I
mA  
mA  
mA  
e
Input Voltage  
V
I
7V  
e
2.7V  
High Level Input  
Current  
V
V
Max  
Max  
Max  
IH  
CC  
e
I
20  
e
0.4V  
b
1.08  
Low Level Input  
Current  
V
V
IL  
CC  
e
I
b
0.4  
100  
100  
e
(Note 2)  
b
b
b
b
Short Circuit  
V
CC  
20  
20  
OS  
CC  
mA  
mA  
Output Current  
e
Supply Current  
V
CC  
Max (Note 3)  
20  
35  
e
e
25 C.  
Note 1: All typicals are at V  
5V, T  
§
CC  
Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second.  
Note 3: is measured with all inputs grounded and all outputs open.  
Note 4: T  
A
I
CC  
e
e
5V.  
25 C and V  
§
A
CC  
2
’LS190 and ’LS191 Switching Characteristics  
e
e
at V  
CC  
5V and T  
25 C (See Section 1 for Test Waveforms and Output Load)  
§
A
e
R
L
2 kX  
From (Input)  
e
e
L
Symbol  
Parameter  
C
15 pF  
C
50 pF  
Max  
Units  
To (Output)  
L
Min  
Max  
Min  
f
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
Maximum Clock  
Frequency  
MAX  
PLH  
PHL  
PLH  
PHL  
PLH  
PHL  
PLH  
PHL  
PLH  
PHL  
PLH  
PHL  
PLH  
PHL  
PLH  
PHL  
20  
20  
MHz  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
Propagation Delay Time  
Low to High Level Output  
Load to  
Any Q  
33  
50  
22  
50  
20  
24  
24  
36  
42  
52  
45  
45  
33  
33  
33  
33  
43  
59  
26  
62  
24  
33  
29  
45  
47  
65  
50  
54  
36  
42  
36  
42  
Propagation Delay Time  
High to Low Level Output  
Load to  
Any Q  
Propagation Delay Time  
Low to High Level Output  
Data to  
Any Q  
Propagation Delay Time  
High to Low Level Output  
Data to  
Any Q  
Propagation Delay Time  
Low to High Level Output  
Clock to  
Ripple Clock  
Propagation Delay Time  
High to Low Level Output  
Clock to  
Ripple Clock  
Propagation Delay Time  
Low to High Level Output  
Clock to  
Any Q  
Propagation Delay Time  
High to Low Level Output  
Clock to  
Any Q  
Propagation Delay Time  
Low to High Level Output  
Clock to  
Max/Min  
Propagation Delay Time  
High to Low Level Output  
Clock to  
Max/Min  
Propagation Delay Time  
Low to High Level Output  
Up/Down to  
Ripple Clock  
Propagation Delay Time  
High to Low Level Output  
Up/Down to  
Ripple Clock  
Propagation Delay Time  
Low to High Level Output  
Down/Up to  
Max/Min  
Propagation Delay Time  
High to Low Level Output  
Down/Up to  
Max/Min  
Propagation Delay Time  
Low to High Level Output  
Enable to  
Ripple Clock  
Propagation Delay Time  
High to Low Level Output  
Enable to  
Ripple Clock  
3
Logic Diagrams  
LS190 Decade Counters  
e
e
GND  
Pin (16)  
V
, Pin (8)  
CC  
TL/F/6405–2  
4
Logic Diagrams (Continued)  
LS191 Binary Counters  
e
e
GND  
Pin (16)  
V
CC  
, Pin (8)  
TL/F/6405–3  
5
Timing Diagrams  
LS190 Decade Counters  
Typical Load, Count, and Inhibit Sequences  
TL/F/6405–4  
LS191 Binary Counters  
Typical Load, Count, and Inhibit Sequences  
TL/F/6405–5  
6
Physical Dimensions inches (millimeters)  
16-Lead Ceramic Dual-In-Line Package (J)  
Order Number DM54LS190J, DM54LS191J  
NS Package Number J16A  
16-Lead Small Outline Molded Package (M)  
Order Number DM74LS190M, DM74LS191M  
NS Package Number M16A  
7
Physical Dimensions inches (millimeters) (Continued)  
16-Lead Molded Dual-In-Line Package (N)  
Order Number DM74LS190N, DM74LS191N  
NS Package Number N16E  
16-Lead Ceramic Flat Package (W)  
Order Number DM54LS190W or DM54LS191W  
NS Package Number W16A  
LIFE SUPPORT POLICY  
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT  
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL  
SEMICONDUCTOR CORPORATION. As used herein:  
1. Life support devices or systems are devices or  
systems which, (a) are intended for surgical implant  
into the body, or (b) support or sustain life, and whose  
failure to perform, when properly used in accordance  
with instructions for use provided in the labeling, can  
be reasonably expected to result in a significant injury  
to the user.  
2. A critical component is any component of a life  
support device or system whose failure to perform can  
be reasonably expected to cause the failure of the life  
support device or system, or to affect its safety or  
effectiveness.  
National Semiconductor  
Corporation  
National Semiconductor  
Europe  
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Hong Kong Ltd.  
National Semiconductor  
Japan Ltd.  
a
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Arlington, TX 76017  
Tel: 1(800) 272-9959  
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@
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National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.  

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