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74LS293 Datasheet

  • 74LS293

  • DECADE COUNTER; 4-BIT BINARY COUNTER

  • 7頁(yè)

  • MOTOROLA   MOTOROLA

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DECADE COUNTER;
4-BIT BINARY COUNTER
The SN54 / 74LS290 and SN54/ 74LS293 are high-speed 4-bit ripple type
counters partitioned into two sections. Each counter has a divide-by-two sec-
tion and either a divide-by-five (LS290) or divide-by-eight (LS293) section
which are triggered by a HIGH-to-LOW transition on the clock inputs. Each
section can be used separately or tied together (Q to CP)to form BCD,
Bi-quinary, or Modulo-16 counters. Both of the counters have a 2-input gated
Master Reset (Clear), and the LS290 also has a 2-input gated Master Set
(Preset 9).
SN54/74LS290
SN54/74LS293
DECADE COUNTER;
4-BIT BINARY COUNTER
LOW POWER SCHOTTKY
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Corner Power Pin Versions of the LS90 and LS93
Low Power Consumption . . . Typically 45 mW
High Count Rates . . . Typically 42 MHz
Choice of Counting Modes . . . BCD, Bi-Quinary, Binary
Input Clamp Diodes Limit High Speed Termination Effects
CONNECTION DIAGRAM DIP
(TOP VIEW)
VCC
14
MR
13
MR
12
CP1
11
CP0
10
Q0
9
Q3
8
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
J SUFFIX
CERAMIC
CASE 632-08
14
1
14
1
N SUFFIX
PLASTIC
CASE 646-06
LS290
1
MS
VCC
14
2
NC
MR
13
3
MS
MR
12
4
Q2
CP1
11
5
Q1
CP0
10
6
NC
Q0
9
14
7
GND
Q3
8
1
D SUFFIX
SOIC
CASE 751A-02
ORDERING INFORMATION
SN54LSXXXJ
SN74LSXXXN
SN74LSXXXD
Ceramic
Plastic
SOIC
LS293
1
NC
2
NC
3
NC
4
Q2
5
Q1
6
NC
7
GND
PIN NAMES
Clock (Active LOW going edge) Input to
梅
2 Section.
Clock (Active LOW going edge) Input to
梅
5 Section (LS290).
Clock (Active LOW going edge) Input to
梅
8 Section (LS293).
Master Reset (Clear) Inputs
Master Set (Preset-9, LS290) Inputs
Output from
梅
2 Section (Notes b & c)
Outputs from
梅
5 &
梅
8 Sections (Note b)
LOADING
(Note a)
HIGH
LOW
1.5 U.L.
2.0 U.L.
1.0 U.L.
0.25 U.L.
0.25 U.L.
5 (2.5) U.L.
5 (2.5) U.L.
CP0
CP1
CP1
MR1, MR2
MS1, MS2
Q0
Q1, Q2, Q3
0.05 U.L.
0.05 U.L.
0.05 U.L.
0.5 U.L.
0.5 U.L.
10 U.L.
10 U.L.
NOTES:
a) 1 TTL Unit Load (U.L.) = 40
碌A(chǔ)
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) Temperature Ranges.
c) The Q0 Outputs are guaranteed to drive the full fan-out plus the CP1 Input of the device.
FAST AND LS TTL DATA
5-466

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