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54LS197 データシート(PDF) 1 Page - Motorola, Inc

部品番号 54LS197
部品情報  4-STAGE PRESETTABLE RIPPLE COUNTERS
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メーカー  MOTOROLA [Motorola, Inc]
ホームページ  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

54LS197 データシート(HTML) 1 Page - Motorola, Inc

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5-1
FAST AND LS TTL DATA
4-STAGE PRESETTABLE
RIPPLE COUNTERS
The SN54/74LS196 decade counter is partitioned into divide-by-two and di-
vide-by-five sections which can be combined to count either in BCD (8, 4, 2, 1)
sequence or in a bi-quinary mode producing a 50% duty cycle output. The
SN54/74LS197 contains divide-by-two and divide-by-eight sections which
can be combined to form a modulo-16 binary counter. Low Power Schottky
technology is used to achieve typical count rates of 70 MHz and power dis-
sipation of only 80 mW.
Both circuit types have a Master Reset (MR) input which overrides all other
inputs and asynchronously forces all outputs LOW. A Parallel Load input (PL)
overrides clocked operations and asynchronously loads the data on the Par-
allel Data inputs (Pn) into the flip-flops. This preset feature makes the circuits
usable as programmable counters. The circuits can also be used as 4-bit
latches, loading data from the Parallel Data inputs when PL is LOW and stor-
ing the data when PL is HIGH.
Low Power Consumption — Typically 80 mW
High Counting Rates — Typically 70 MHz
Choice of Counting Modes — BCD, Bi-Quinary, Binary
Asynchronous Presettable
Asynchronous Master Reset
Easy Multistage Cascading
Input Clamp Diodes Limit High Speed Termination Effects
CONNECTION DIAGRAM DIP (TOP VIEW)
14
13
12
11
10
9
1234
56
8
7
VCC
MR
Q3
P3
P1
Q1
CP0
PL
Q2
P2
P0
Q0
CP1
GND
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
PIN NAMES
LOADING (Note a)
HIGH
LOW
CP0
Clock (Active LOW Going Edge)
1.0 U.L.
1.5 U.L.
Input to Divide-by-Two Section
CP1 (LS196)
Clock (Active LOW Going Edge)
2.0 U.L.
1.75 U.L.
Input to Divide-by-Five Section
CP1 (LS197)
Clock (Active LOW Going Edge)
1.0 U.L.
0.8 U.L.
Input to Divide-by-Eight Section
MR
Master Reset (Active LOW) Input
1.0 U.L.
0.5 U.L.
PL
Parallel Load (Active LOW) Input
0.5 U.L.
0.25 U.L.
P0–P3
Data Inputs
0.5 U.L.
0.25 U.L.
Q0–Q3
Outputs (Notes b, c)
10 U.L.
5 (2.5) U.L.
NOTES:
a. 1 TTL Unit Load (U.L.) = 40
µA HIGH/1.6 mA LOW.
b. The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74)
b. Temperature Ranges.
c. In addition to loading shown, Q0 can also drive CP1.
SN54/74LS196
SN54/74LS197
4-STAGE PRESETTABLE
RIPPLE COUNTERS
LOW POWER SCHOTTKY
J SUFFIX
CERAMIC
CASE 632-08
N SUFFIX
PLASTIC
CASE 646-06
14
1
14
1
ORDERING INFORMATION
SN54LSXXXJ
Ceramic
SN74LSXXXN
Plastic
SN74LSXXXD
SOIC
14
1
D SUFFIX
SOIC
CASE 751A-02
LOGIC SYMBOL
CP0
CP1
PL
MR
P0
Q0
P1 P2 P3
Q1 Q2 Q3
1
4 10 3 11
12
2
9
5
13
6
8
VCC = PIN 14
GND = PIN 7


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