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DECADE COUNTER; DIVIDE-BY-TWELVE COUNTER; 4-BIT BINARY COUNTER
The SN54 / 74LS90, SN54 / 74LS92 and SN54 / 74LS93 are high-speed 4-bit ripple type counters partitioned into two sections. Each counter has a divide-by-two section and either a divide-by-five (LS90), divide-by-six (LS92) or divide-by-eight (LS93) 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, modulo-12, or modulo-16 counters. All of the counters have a 2-input gated Master Reset (Clear), and the LS90 also has a 2-input gated Master Set (Preset 9).
SN54/74LS90 SN54/74LS92 SN54/74LS93
DECADE COUNTER; DIVIDE-BY-TWELVE COUNTER; 4-BIT BINARY COUNTER
LOW POWER SCHOTTKY
* Low Power Consumption . . . Typically 45 mW * High Count Rates . . . Typically 42 MHz * Choice of Counting Modes . . . BCD, Bi-Quinary, Divide-by-Twelve,
Binary * Input Clamp Diodes Limit High Speed Termination Effects
PIN NAMES LOADING (Note a) HIGH CP0 CP1 CP1 MR1, MR2 MS1, MS2 Q0 Q1, Q2, Q3 Clock (Active LOW going edge) Input to /2 Section Clock (Active LOW going edge) Input to /5 Section (LS90), /6 Section (LS92) Clock (Active LOW going edge) Input to /8 Section (LS93) Master Reset (Clear) Inputs Master Set (Preset-9, LS90) Inputs Output from /2 Section (Notes b & c) Outputs from /5 (LS90), /6 (LS92), /8 (LS93) Sections (Note b) 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. LOW 1.5 U.L.
14 14 1
J SUFFIX CERAMIC CASE 632-08
N SUFFIX PLASTIC CASE 646-06
1
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.
14 1
D SUFFIX SOIC CASE 751A-02
ORDERING INFORMATION
SN54LSXXJ SN74LSXXN SN74LSXXD Ceramic Plastic SOIC
NOTES: a. 1 TTL Unit Load (U.L.) = 40 A 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. The Q0 Outputs are guaranteed to drive the full fan-out plus the CP1 input of the device. d. To insure proper operation the rise (tr) and fall time (tf) of the clock must be less than 100 ns.
LOGIC SYMBOL LS90
67 12 MS CP0 CP1 MR Q0 Q1 Q2 Q3 12 2 3 12 9 8 11 VCC = PIN 5 GND = PIN 10 NC = PINS 4, 13 14 1 CP0 CP1 MR Q0 Q1 Q2 Q3 12 6 7 12 11 9 8 VCC = PIN 5 GND = PIN 10 NC = PINS 2, 3, 4, 13 14 1 CP0 CP1 MR Q0 Q1 Q2 Q3 12 2 3 12 9 8 11 VCC = PIN 5 GND = PIN 10 NC = PIN 4, 6, 7, 13
LS92
LS93
14 1
FAST AND LS TTL DATA 5-1
SN54/74LS90 * SN54/74LS92 * SN54/74LS93
LOGIC DIAGRAM LS90
MS1 MS2
6 7
CONNECTION DIAGRAM DIP (TOP VIEW)
CP1 1 14 CP0 13 NC 12 Q0 11 Q3 10 GND 9 Q1 8 Q2
14
S J DQ CP KC Q D
S J DQ CP KC Q D
S J DQ CP KC Q D
S R DQ CP SC Q D
MR1 2 MR2 3 NC 4 VCC 5 MS1 6
CP0
1
CP1 MR1 MR2
2 12 3 9 8 11
MS2 7 Q3
Q0
Q1
Q2 = PIN NUMBERS VCC = PIN 5 GND = PIN 10
NC = NO INTERNAL CONNECTION
NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package.
LOGIC DIAGRAM LS92
CONNECTION DIAGRAM DIP (TOP VIEW)
CP1 1 14 CP0 13 NC 12 Q0 11 Q1 10 GND 9 Q2 8 Q3
CP0
14
J
Q
J
Q
J
Q
J
Q
NC 2 NC 3 NC 4 VCC 5 MR1 6
CP KC Q D
1
CP KC Q D
CP KC Q D
CP KC Q D
CP1
6
MR1 MR2
12 7
11
9
8
MR2 7 Q3
Q0
Q1
Q2
NC = NO INTERNAL CONNECTION = PIN NUMBERS VCC = PIN 5 GND = PIN 10
NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package.
LOGIC DIAGRAM LS93
CONNECTION DIAGRAM DIP (TOP VIEW)
CP1 1 14 CP0 13 NC 12 Q0 11 Q3 10 GND 9 Q1 8 Q2
CP0
14
J CP
Q
J CP
Q
J CP
Q
J CP
Q
MR1 2 MR2 3 NC 4 VCC 5 NC 6
KC Q D
1
KC Q D
KC Q D
KC Q D
CP1 MR1 MR2
2 12 3 9 8 11
Q0
Q1
Q2
Q3 = PIN NUMBERS VCC = PIN 5 GND = PIN 10
NC 7
NC = NO INTERNAL CONNECTION
NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package.
FAST AND LS TTL DATA 5-2
SN54/74LS90 * SN54/74LS92 * SN54/74LS93
FUNCTIONAL DESCRIPTION The LS90, LS92, and LS93 are 4-bit ripple type Decade, Divide-By-Twelve, and Binary Counters respectively. Each device consists of four master/slave flip-flops which are internally connected to provide a divide-by-two section and a divide-by-five (LS90), divide-by-six (LS92), or divide-by-eight (LS93) section. Each section has a separate clock input which initiates state changes of the counter on the HIGH-to-LOW clock transition. State changes of the Q outputs do not occur simultaneously because of internal ripple delays. Therefore, decoded output signals are subject to decoding spikes and should not be used for clocks or strobes. The Q0 output of each device is designed and specified to drive the rated fan-out plus the CP1 input of the device. A gated AND asynchronous Master Reset (MR1 * MR2) is provided on all counters which overrides and clocks and resets (clears) all the flip-flops. A gated AND asynchronous Master Set (MS1 * MS2) is provided on the LS90 which overrides the clocks and the MR inputs and sets the outputs to nine (HLLH). Since the output from the divide-by-two section is not internally connected to the succeeding stages, the devices may be operated in various counting modes. LS90 A. BCD Decade (8421) Counter -- The CP1 input must be externally connected to the Q0 output. The CP0 input receives the incoming count and a BCD count sequence is produced. B. Symmetrical Bi-quinary Divide-By-Ten Counter -- The Q3 output must be externally connected to the CP0 input. The input count is then applied to the CP1 input and a divide-byten square wave is obtained at output Q0. C. Divide-By-Two and Divide-By-Five Counter -- No external interconnections are required. The first flip-flop is used as a binary element for the divide-by-two function (CP0 as the input and Q0 as the output). The CP1 input is used to obtain binary divide-by-five operation at the Q3 output. LS92 A. Modulo 12, Divide-By-Twelve Counter -- The CP1 input must be externally connected to the Q0 output. The CP0 input receives the incoming count and Q3 produces a symmetrical divide-by-twelve square wave output. B. Divide-By-Two and Divide-By-Six Counter --No external interconnections are required. The first flip-flop is used as a binary element for the divide-by-two function. The CP1 input is used to obtain divide-by-three operation at the Q1 and Q2 outputs and divide-by-six operation at the Q3 output. LS93 A. 4-Bit Ripple Counter -- The output Q0 must be externally connected to input CP1. The input count pulses are applied to input CP0. Simultaneous divisions of 2, 4, 8, and 16 are performed at the Q0, Q1, Q2, and Q3 outputs as shown in the truth table. B. 3-Bit Ripple Counter-- The input count pulses are applied to input CP1. Simultaneous frequency divisions of 2, 4, and 8 are available at the Q1, Q2, and Q3 outputs. Independent use of the first flip-flop is available if the reset function coincides with reset of the 3-bit ripple-through counter.
FAST AND LS TTL DATA 5-3
SN54/74LS90 * SN54/74LS92 * SN54/74LS93
LS90 MODE SELECTION
RESET / SET INPUTS MR1 MR2 MS1 MS2 H H X L X L X H H X X L X L L X H L X X L X L H X L L X Q0 L L H OUTPUTS Q1 Q2 Q3 L L H
LS92 AND LS93 MODE SELECTION
RESET INPUTS MR1 MR2 H L H L H H L L Q0 L OUTPUTS Q1 Q2 Q3 L
L L L L L L Count Count Count Count
L L Count Count Count
H = HIGH Voltage Level L = LOW Voltage Level X = Don't Care
H = HIGH Voltage Level L = LOW Voltage Level X = Don't Care
LS90 BCD COUNT SEQUENCE
OUTPUT COUNT 0 1 2 3 4 5 6 7 8 9 Q0 L H L H L H L H L H Q1 L L H H L L H H L L Q2 L L L L H H H H L L Q3 L L L L L L L L H H
LS92 TRUTH TABLE
OUTPUT COUNT 0 1 2 3 4 5 6 7 8 9 10 11 Q0 L H L H L H L H L H L H Q1 L L H H L L L L H H L L Q2 L L L L H H L L L L H H Q3 L L L L L L H H H H H H
LS93 TRUTH TABLE
OUTPUT COUNT 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Q0 L H L H L H L H L H L H L H L H Q1 L L H H L L H H L L H H L L H H Q2 L L L L H H H H L L L L H H H H Q3 L L L L L L L L H H H H H H H H
NOTE: Output Q0 is connected to Input CP1 for BCD count.
NOTE: Output Q0 is connected to Input CP1.
NOTE: Output Q0 is connected to Input CP1.
FAST AND LS TTL DATA 5-4
SN54/74LS90 * SN54/74LS92 * SN54/74LS93
GUARANTEED OPERATING RANGES
Symbol VCC TA IOH IOL Supply Voltage Operating Ambient Temperature Range Output Current -- High Output Current -- Low Parameter 54 74 54 74 54, 74 54 74 Min 4.5 4.75 - 55 0 Typ 5.0 5.0 25 25 Max 5.5 5.25 125 70 - 0.4 4.0 8.0 Unit V C mA mA
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits Symbol S bl VIH VIL VIK VOH Parameter P Input HIGH Voltage 54 Input LOW Voltage 74 Input Clamp Diode Voltage 54 Output HIGH Voltage 74 54, 74 VOL Output LOW Voltage 74 Input HIGH Current 0.1 Input LOW Current MS, MR CP0 CP1 (LS90, LS92) CP1 (LS93) Short Circuit Current (Note 1) Power Supply Current - 20 - 0.4 - 2.4 - 3.2 - 1.6 -100 15 0.35 0.5 20 IIH V A mA 2.7 3.5 0.25 0.4 V V 2.5 - 0.65 3.5 0.8 - 1.5 V V Min 2.0 0.7 V Typ Max Unit Ui V Test C di i T Conditions Guaranteed Input HIGH Voltage for All Inputs Guaranteed Input LOW Voltage for p g All Inputs VCC = MIN, IIN = - 18 mA VCC = MIN, IOH = MAX, VIN = VIH , , or VIL per Truth Table IOL = 4.0 mA IOL = 8.0 mA VCC = VCC MIN, VIN = VIL or VIH per Truth Table
VCC = MAX, VIN = 2.7 V VCC = MAX, VIN = 7.0 V
IIL
mA
VCC = MAX, VIN = 0.4 V
IOS ICC
mA mA
VCC = MAX VCC = MAX
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
FAST AND LS TTL DATA 5-5
SN54/74LS90 * SN54/74LS92 * SN54/74LS93
AC CHARACTERISTICS (TA = 25C, VCC = 5.0 V, CL = 15 pF)
Limits LS90 Symbol S bl fMAX fMAX tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPHL Parameter P CP0 Input Clock Frequency CP1 Input Clock Frequency Propagation Delay, CP0 Input to Q0 Output CP0 Input to Q3 Output CP1 Input to Q1 Output CP1 Input to Q2 Output CP1 Input to Q3 Output MS Input to Q0 and Q3 Outputs MS Input to Q1 and Q2 Outputs MR Input to Any Output Min 32 16 10 12 32 34 10 14 21 23 21 23 20 26 26 16 18 48 50 16 21 32 35 32 35 30 40 40 26 40 26 40 Typ Max Min 32 16 10 12 32 34 10 14 10 14 21 23 16 18 48 50 16 21 16 21 32 35 LS92 Typ Max Min 32 16 10 12 46 46 10 14 21 23 34 34 16 18 70 70 16 21 32 35 51 51 LS93 Typ Max Unit Ui MHz MHz ns ns ns ns ns ns ns ns
AC SETUP REQUIREMENTS (TA = 25C, VCC = 5.0 V)
Limits LS90 S bl Symbol tW tW tW tW trec P Parameter CP0 Pulse Width CP1 Pulse Width MS Pulse Width MR Pulse Width Recovery Time MR to CP Min 15 30 15 15 25 15 25 15 25 Max Min 15 30 LS92 Max Min 15 30 LS93 Max Ui Unit ns ns ns ns ns
RECOVERY TIME (trec) is defined as the minimum time required between the end of the reset pulse and the clock transition from HIGH-to-LOW in order to recognize and transfer HIGH data to the Q outputs
AC WAVEFORMS
*CP 1.3 V tPHL Q 1.3 V 1.3 V tW 1.3 V tPLH 1.3 V
Figure 1
*The number of Clock Pulses required between the tPHL and tPLH measurements can be determined from the appropriate Truth Tables.
MR & MS
1.3 V tW
1.3 V trec 1.3 V
MS
1.3 V tW
1.3 V trec 1.3 V
CP tPHL Q 1.3 V
CP Q0 * Q3 (LS90) tPLH 1.3 V
Figure 2
Figure 3
FAST AND LS TTL DATA 5-6

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