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SN74LS193 Presettable 4-Bit Binary Up/Down Counter
The SN74LS193 is an UP/DOWN MODULO-16 Binary Counter. Separate Count Up and Count Down Clocks are used and the circuits can operate synchronously. The outputs change state synchronous with the LOW-to-HIGH transitions on the clock inputs. Separate Terminal Count Up and Terminal Count Down outputs are provided which are used as the clocks for a subsequent stages without extra logic, thus simplifying multistage counter designs. Individual preset inputs allow the circuits to be used as programmable counters. Both the Parallel Load (PL) and the Master Reset (MR) inputs asynchronously override the clocks.
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LOW POWER SCHOTTKY
* * * * * * *
Low Power . . . 95 mW Typical Dissipation High Speed . . . 40 MHz Typical Count Frequency Synchronous Counting Asynchronous Master Reset and Parallel Load Individual Preset Inputs Cascading Circuitry Internally Provided Input Clamp Diodes Limit High Speed Termination Effects
16 1
GUARANTEED OPERATING RANGES
Symbol VCC TA IOH IOL Parameter Supply Voltage Operating Ambient Temperature Range Output Current - High Output Current - Low Min 4.75 0 Typ 5.0 25 Max 5.25 70 - 0.4 8.0 Unit V C
16
PLASTIC N SUFFIX CASE 648
mA mA
1
SOIC D SUFFIX CASE 751B
ORDERING INFORMATION
Device SN74LS193N SN74LS193D Package 16 Pin DIP 16 Pin Shipping 2000 Units/Box 2500/Tape & Reel
(c) Semiconductor Components Industries, LLC, 1999
1
December, 1999 - Rev. 0
Publication Order Number: SN74LS193/D
SN74LS193
CONNECTION DIAGRAM DIP (TOP VIEW)
VCC 16 P0 15 MR 14 TCD 13 TCU 12 PL 11 P2 10 P3 9 NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package. 1 P1 2 Q1 3 Q0 4 CPD 5 CPU 6 Q2 7 Q3 8 GND
LOADING (Note a) PIN NAMES CPU CPD MR PL Pn Qn TCD TCU Count Up Clock Pulse Input Count Down Clock Pulse Input Asynchronous Master Reset (Clear) Input Asynchronous Parallel Load (Active LOW) Input Parallel Data Inputs Flip-Flop Outputs Terminal Count Down (Borrow) Output Terminal Count Up (Carry) Output HIGH 0.5 U.L. 0.5 U.L. 0.5 U.L. 0.5 U.L. 0.5 U.L. 10 U.L. 10 U.L. 10 U.L. LOW 0.25 U.L. 0.25 U.L. 0.25 U.L. 0.25 U.L. 0.25 U.L. 5 U.L. 5 U.L. 5 U.L.
NOTES: a) 1 TTL Unit Load (U.L.) = 40 mA HIGH/1.6 mA LOW.
LOGIC SYMBOL
11 15 1 10 9
PL 5 4 CPU CPD
P0 P1 P2
P3
TCU
12
MR Q0 Q1 Q2 Q3 14 3 2 6 7
TCD
13
VCC = PIN 16 GND = PIN 8
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SN74LS193
STATE DIAGRAM
0
1
2
3
4
15
5
LOGIC EQUATIONS FOR TERMINAL COUNT
TCU = Q0 Q1 Q2 Q3 CPU TCD = Q0 Q1 Q2 Q3 CPD
14
6 COUNT UP COUNT DOWN
13
7
12
11
10
9
8
LOGIC DIAGRAM
P0 PL (LOAD) CPU (UP COUNT)
11 5 12 15 1
P1
10
P2
9
P3
TCU (CARRY OUTPUT)
SD T
Q T
SD
Q T
SD
Q T
SD
Q
CD Q
CD Q
CD Q
CD Q
13
CPD (DOWN COUNT) MR (CLEAR)
4 14 3 2 6 7
TCD (BORROW OUTPUT)
Q0 VCC = PIN 16 GND = PIN 8 = PIN NUMBERS
Q1
Q2
Q3
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SN74LS193
FUNCTIONAL DESCRIPTION
The LS193 is a 4-Bit Binary Synchronous UP / DOWN (Reversable) Counter. Each circuit contains four master/slave flip-flops, with internal gating and steering logic to provide master reset, individual preset, count up and count down operations. Each flip-flop contains JK feedback from slave to master such that a LOW-to-HIGH transition on its T input causes the slave, and thus the Q output to change state. Synchronous switching, as opposed to ripple counting, is achieved by driving the steering gates of all stages from a common Count Up line and a common Count Down line, thereby causing all state changes to be initiated simultaneously. A LOW-to-HIGH transition on the Count Up input will advance the count by one; a similar transition on the Count Down input will decrease the count by one. While counting with one clock input, the other should be held HIGH. Otherwise, the circuit will either count by twos or not at all, depending on the state of the first flip-flop, which cannot toggle as long as either Clock input is LOW. The Terminal Count Up (TCU) and Terminal Count Down (TCD) outputs are normally HIGH. When a circuit has
reached the maximum count state of 15, the next HIGH-to-LOW transition of the Count Up Clock will cause TCU to go LOW. TCU will stay LOW until CPU goes HIGH again, thus effectively repeating the Count Up Clock, but delayed by two gate delays. Similarly, the TCD output will go LOW when the circuit is in the zero state and the Count Down Clock goes LOW. Since the TC outputs repeat the clock waveforms, they can be used as the clock input signals to the next higher order circuit in a multistage counter. Each circuit has an asynchronous parallel load capability permitting the counter to be preset. When the Parallel Load (PL) and the Master Reset (MR) inputs are LOW, information present on the Parallel Data inputs (P0, P3) is loaded into the counter and appears on the outputs regardless of the conditions of the clock inputs. A HIGH signal on the Master Reset input will disable the preset gates, override both Clock inputs, and latch each Q output in the LOW state. If one of the Clock inputs is LOW during and after a reset or load operation, the next LOW-to-HIGH transition of that Clock will be interpreted as a legitimate signal and will be counted.
MODE SELECT TABLE
MR H L L L L PL X L H H H CPU X X H H CPD X X H H MODE Reset (Asyn.) Preset (Asyn.) No Change Count Up Count Down
L = LOW Voltage Level H = HIGH Voltage Level X = Don't Care = LOW-to-HIGH Clock Transition
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SN74LS193
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits Symbol VIH VIL VIK VOH Parameter Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Voltage 2.7 - 0.65 3.5 0.25 VO OL Output LOW Voltage 0.35 IIH IIL IOS ICC Input HIGH Current 0.1 Input LOW Current Short Circuit Current (Note 1) Power Supply Current - 20 - 0.4 - 100 34 0.5 20 V A mA mA mA mA IOL = 8.0 mA 0.4 Min 2.0 0.8 - 1.5 Typ Max Unit V V V V V Test Conditions Guaranteed Input HIGH Voltage for All Inputs Guaranteed Input LOW Voltage for All Inputs VCC = MIN, IIN = - 18 mA VCC = MIN, IOH = MAX, VIN = VIH or VIL per Truth Table IOL = 4.0 mA VCC = VCC MIN, VIN = VIL or VIH per Truth Table
VCC = MAX, VIN = 2.7 V VCC = MAX, VIN = 7.0 V VCC = MAX, VIN = 0.4 V VCC = MAX VCC = MAX
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS (TA = 25C)
Limits Symbol fMAX tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPHL Parameter Maximum Clock Frequency CPU Input to TCU Output CPD Input to TCD Output Clock to Q PL to Q MR Input to Any Output Min 25 Typ 32 17 18 16 15 27 30 24 25 23 26 24 24 24 38 47 40 40 35 Max Unit MHz ns ns ns ns ns VCC = 5.0 V CL = 15 pF Test Conditions
AC SETUP REQUIREMENTS (TA = 25C)
Limits Symbol tW ts th trec Parameter Any Pulse Width Data Setup Time Data Hold Time Recovery Time Min 20 20 5.0 40 Typ Max Unit ns ns ns ns VCC = 5 0 V 5.0 Test Conditions
DEFINITIONS OF TERMS
SETUP TIME (ts) is defined as the minimum time required for the correct logic level to be present at the logic input prior to the PL transition from LOW-to-HIGH in order to be recognized and transferred to the outputs. HOLD TIME (th) is defined as the minimum time following the PL transition from LOW-to-HIGH that the logic level must be maintained at the input in order to ensure continued
recognition. A negative HOLD TIME indicates that the correct logic level may be released prior to the PL transition from LOW-to-HIGH and still be recognized. RECOVERY TIME (trec) is defined as the minimum time required between the end of the reset pulse and the clock transition from LOW-to-HIGH in order to recognize and transfer HIGH data to the Q outputs.
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SN74LS193
AC WAVEFORMS
CPU or CPD
1.3 V tPHL
tW tPLH
1.3 V
Q
1.3 V
1.3 V
Figure 1.
CPU or CPD tPHL TCU or TCD
1.3 V tPLH 1.3 V
Pn
1.3 V tPHL tPLH
Qn
1.3 V
NOTE: PL = LOW
Figure 2.
Figure 3.
Pn tw PL 1.3 V tPLH Qn
1.3 V PL tW tPHL 1.3 V Q CPU or CPD tPHL 1.3 V 1.3 V 1.3 V trec
Figure 4.
Figure 5.
Pn ts(H) PL
1.3 V th(H) ts(L) 1.3 V
1.3 V th(L) MR tW CPU or CPD Q=P Q 1.3 V trec 1.3 V tPHL 1.3 V
Qn
Q=P
* The shaded areas indicate when the input is permitted * to change for predictable output performance
Figure 6.
Figure 7.
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SN74LS193
PACKAGE DIMENSIONS
N SUFFIX PLASTIC PACKAGE CASE 648-08 ISSUE R
-A-
16 9 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION L TO CENTER OF LEADS WHEN FORMED PARALLEL. 4. DIMENSION B DOES NOT INCLUDE MOLD FLASH. 5. ROUNDED CORNERS OPTIONAL. DIM A B C D F G H J K L M S INCHES MIN MAX 0.740 0.770 0.250 0.270 0.145 0.175 0.015 0.021 0.040 0.70 0.100 BSC 0.050 BSC 0.008 0.015 0.110 0.130 0.295 0.305 0_ 10 _ 0.020 0.040 MILLIMETERS MIN MAX 18.80 19.55 6.35 6.85 3.69 4.44 0.39 0.53 1.02 1.77 2.54 BSC 1.27 BSC 0.21 0.38 2.80 3.30 7.50 7.74 0_ 10 _ 0.51 1.01
B
1 8
F S
C
L
-T- H G D
16 PL
SEATING PLANE
K
J TA
M
M
0.25 (0.010)
M
D SUFFIX PLASTIC SOIC PACKAGE CASE 751B-05 ISSUE J
-A-
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION. MILLIMETERS MIN MAX 9.80 10.00 3.80 4.00 1.35 1.75 0.35 0.49 0.40 1.25 1.27 BSC 0.19 0.25 0.10 0.25 0_ 7_ 5.80 6.20 0.25 0.50 INCHES MIN MAX 0.386 0.393 0.150 0.157 0.054 0.068 0.014 0.019 0.016 0.049 0.050 BSC 0.008 0.009 0.004 0.009 0_ 7_ 0.229 0.244 0.010 0.019
16
9
-B-
1 8
P
8 PL
0.25 (0.010)
M
B
S
G F
K C -T-
SEATING PLANE
R
X 45 _
M D
16 PL M
J
0.25 (0.010)
TB
S
A
S
DIM A B C D F G J K M P R
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SN74LS193
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SN74LS193/D

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