SN54LS669

SYNCHRONOUS 4-BIT UP/DOWN COUNTER The SN54 / 74LS669 is a synchronous 4-bit up/down counter. The LS669 is a 4-bit binary counter. For high speed counting applications, this presettable counter features an internal carry lookahead for cascading purposes. By clocking all flip-flops simultaneously so the outputs change coincident with each other (when instructed to do so by the count enable inputs and internal gating) synchronous operation is provided. This helps to eliminate output counting spikes, normally associated with asynchronous (ripple-clock) counters. The four master-slave flip-flops are triggered on the rising (positive-going) edge of the clock waveform by a buffered clock input. Circuitry of the load inputs allows loading with the carry-enable output of the cascaded counters. Because loading is synchronous, disabling of the counter by setting up a low level on the load input will cause the outputs to agree with the data inputs after the next clock pulse. Cascading counters for N-bit synchronous applications are provided by the carry look-ahead circuitry, without additional gating. Two count-enable inputs and a carry output help accomplish this function. Count-enable inputs (P and T) must both be low to count. The level of the up-down input determines the direction of the count. When the input level is low, the counter counts down, and when the input is high, the count is up. Input T is fed forward to enable the carry output. The carry output will now produce a low level output pulse with a duration ≈ equal to the high portion of the QA output when counting up and when counting down ≈ equal to the low portion of the QA output. This low level carry pulse may be utilized to enable successive cascaded stages. Regardless of the level of the clock input, transitions at the P or T inputs are allowed. By diode-clamping all inputs, transmission line effects are minimized which allows simplification of system design. Any changes at control inputs (ENABLE P, ENABLE T, LOAD, UP/ DOWN) will have no effect on the operating mode until clocking occurs because of the fully independant clock circuits. Whether enabled, disabled, loading or counting, the function of the counter is dictated entirely by the conditions meeting the stable setup and hold times. SN54/74LS669 SYNCHRONOUS 4-BIT UP/DOWN COUNTER LOW POWER SCHOTTKY J SUFFIX CERAMIC CASE 620-09 16 1 16 1 N SUFFIX PLASTIC CASE 648-08 16 1 D SUFFIX SOIC CASE 751B-03 • • • • • • ORDERING INFORMATION SN54LSXXXJ SN74LSXXXN SN74LSXXXD Ceramic Plastic SOIC Programmable Look-Ahead Up/Down Binary/ Decade Counters Fully Synchronous Operation for Counting and Programming Internal Look-Ahead for Fast Counting Carry Output for n-Bit Cascading Fully Independent Clock Circuit Buffered Outputs CONNECTION DIAGRAM (TOP VIEW) OUTPUTS RIPPLE CARRY V CC 16 OUTPUT Q A 15 14 Q B 13 Q C 12 Q D 11 ENABLE T LOAD 9 10 RIPPLE CARRY OUTPUT Q A Q B Q C Q D ENABLE T LOAD ENABLE UP/DOWN CK A B C D P 1 U/D 2 CK 3 A 4 B 5 C 6 D 7 ENABLE P 8 GND DATA INPUTS FAST AND LS TTL DATA 5-591 SN54/74LS669 LOGIC DIAGRAM (3) DATA P0 (9) LOAD (4) DATA P1 (5) DATA P2 (6) DATA P3 (7) (10) (1) ENP ENT U/D RCO (15) (RIPPLE CARRY OUTPUT) (2) CP CP D CP D CP D CP D QA (14) QB (13) QC (12) QD (11) 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 FAST AND LS TTL DATA 5-592 SN54/74LS669 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol VIH VIL VIK VOH Parameter Input HIGH Voltage 54 Input LOW Voltage 74 Input Clamp Diode Voltage 54 Output HIGH Voltage 74 54, 74 VOL Output LOW Voltage 74 Others Enable T IIH Input HIGH Current Others Enable T Others IIL IOS ICC Input LOW Current Enable T Short Circuit Current (Note 1) Power Supply Current – 20 –0.8 – 100 34 mA mA mA 0.1 0.2 –0.4 0.35 0.5 20 40 V µA µA mA mA mA VCC = MAX, VIN = 0.4 V VCC = MAX VCC = MAX VCC = MAX, VIN = 7.0 V 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 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 IOL = 8.0 mA VCC = VCC MIN, VIN = VIL or VIH per Truth Table VCC = MAX, VIN = 2.7 V Note 1: Not more than one output should be shorted at a time, nor for more than 1 second. AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V) Limits Symbol fMAX tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL Parameter Maximum Clock Frequency Propagation Delay, Clock to RCO Propagation Delay, Clock to Any Q Enable to RCO U/D to RCO Min 25 Typ 32 26 40 18 18 11 29 22 26 40 60 27 27 17 45 35 40 Max Unit MHz ns ns ns ns Test Conditions CL = 15 pF AC SETUP REQUIREMENTS (TA = 25°C) Limits Symbol tW ts ts ts ts th Parameter Clock Pulse Width Data Setup Time Enable Setup Time Load Setup Time U/D Setup Time Hold Time, Any Input Min 20 20 35 25 30 0 Typ Max Unit ns ns ns ns ns ns VCC = 5.0 V Test Conditions FAST AND LS TTL DATA 5-593 SN54/74LS669 PARAMETER MEASUREMENT INFORMATION tw(clock) CLOCK INPUT 1.3 V 1.3 V 1.3 V 1.3 V 1.3 V 0V ts th LOAD INPUT 0V ts th 3V DATA INPUTS A,B,C, and D 1.3 V 1.3 V 0V 1.3 V 1.3 V ts 3V tw(clock) 3V ts th 0V ENABLE P or ENABLE T 1.3 V 1.3 V 3V ts th ts th 3V UP/DOWN INPUT 1.3 V 1.3 V 1.3 V 1.3 V 0V VOLTAGE WAVEFORMS 3V ENABLE T INPUT 1.3 V 1.3 V 0V tPHL tPLH VOL RIPPLE CARRY OUTPUT 1.3 V 1.3 V VOH FAST AND LS TTL DATA 5-594 -A- Case 751B-03 D Suffix 16-Pin Plastic SO-16 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. 3. CONTROLLING DIMENSION: MILLIMETER. DIMENSION A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. 751B 01 IS OBSOLETE, NEW STANDARD 751B 03. 16 9 -B1 8 P 8 PL 0.25 (0.010) M B M R X 45° G -TD 16 PL 0.25 (0.010) M C SEATING PLANE K T B S M F J A S DIM A B C D F G J K M P R MILLIMETERS MIN MAX 9.80 3.80 1.35 0.35 0.40 10.00 4.00 1.75 0.49 1.25 INCHES MIN MAX 0.386 0.150 0.054 0.014 0.016 0.393 0.157 0.068 0.019 0.049 1.27 BSC 0.19 0.10 0 0.25 0.25 7 0.050 BSC 0.008 0.004 0 0.009 0.009 7 ° ° ° ° 5.80 0.25 6.20 0.50 0.229 0.010 0.244 0.019 Case 648-08 N Suffix 16-Pin Plastic -A16 9 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. 3. CONTROLLING DIMENSION: INCH. DIMENSION L" TO CENTER OF LEADS WHEN FORMED PARALLEL. 4. DIMENSION B" DOES NOT INCLUDE MOLD FLASH. 5. 6. ROUNDED CORNERS OPTIONAL. 648 01 THRU 07 OBSOLETE, NEW STANDARD 648 08. B 1 8 F S C -TK SEATING PLANE L H G D 16 PL 0.25 (0.010) M J M T A M DIM A B C D F G H J K L M S MILLIMETERS MIN MAX 18.80 6.35 3.69 0.39 1.02 19.55 6.85 4.44 0.53 1.77 INCHES MIN MAX 0.740 0.250 0.145 0.015 0.040 0.770 0.270 0.175 0.021 0.070 2.54 BSC 1.27 BSC 0.21 2.80 7.50 0 0.38 3.30 7.74 10 0.100 BSC 0.050 BSC 0.008 0.110 0.295 0 0.015 0.130 0.305 10 ° ° ° ° 0.51 1.01 0.020 0.040 -A16 9 Case 620-09 J Suffix 16-Pin Ceramic Dual In-Line NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. -B1 8 3. DIMENSION L TO CENTER OF LEAD WHEN FORMED PARALLEL. 4. DIM F MAY NARROW TO 0.76 (0.030) WHERE THE LEAD ENTERS THE CERAMIC BODY. C L 5. 620 01 THRU 08 OBSOLETE, NEW STANDARD 620 09. -TSEATING PLANE K E F D 16 PL 0.25 (0.010) M N G T A S M J 16 PL 0.25 (0.010) M T B S DIM A B C D E F G J K L M N MILLIMETERS MIN MAX 19.05 6.10 19.55 7.36 4.19 0.39 0.53 INCHES MIN MAX 0.750 0.240 0.770 0.290 0.165 0.015 0.021 1.27 BSC 1.40 1.77 0.050 BSC 0.055 0.070 2.54 BSC 0.23 0.27 5.08 7.62 BSC 0 0.100 BSC 0.009 0.011 0.200 0.300 BSC 0 ° 15 ° ° 15 ° 0.39 0.88 0.015 0.035 FAST AND LS TTL DATA 5-595 Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters can and do vary in different applications. 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ASIA PACIFIC: Motorola Semiconductors H.K. Ltd.; Silicon Harbour Center, No. 2 Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong. ◊ FAST AND LS TTL DATA 5-596