SN74LS669N

SN74LS669 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 9 equal to the high portion of the QA output when counting up and when counting down 9 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. • 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 http://onsemi.com SYNCHRONOUS 4-BIT UP/DOWN COUNTER LOW POWER SCHOTTKY 16 J SUFFIX CERAMIC CASE 620-09 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 © Semiconductor Components Industries, LLC, 2006 July, 2006 − Rev. 6 1 Publication Order Number: SN74LS669/D SN74LS669 CONNECTION DIAGRAM (TOP VIEW) RIPPLE CARRY OUTPUT OUTPUTS QA QB 13 QB QC 12 QC QD 11 QD ENABLE T VCC 16 15 RIPPLE CARRY OUTPUT LOAD 9 14 QA 10 ENABLE T UP/DOWN CK 1 U/D 2 CK A 3 A B 4 B C 5 C D 6 D LOAD ENABLE P 7 ENABLE P 8 GND DATA INPUTS LOGIC DIAGRAM (3) DATA P0 (9) LOAD (4) DATA P1 (5) DATA P2 (6) DATA P3 (7) ENP (10) ENT (1) 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 http://onsemi.com 2 SN74LS669 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 54 74 54, 74 74 Others IIH Input HIGH Current Enable T Others Enable T IIL IOS ICC Input LOW Current Short Circuit Current (Note 1) Power Supply Current Others Enable T − 20 2.5 2.7 54 74 − 0.65 3.5 3.5 0.25 0.35 0.4 0.5 20 40 0.1 0.2 −0.4 −0.8 − 100 34 Min 2.0 0.7 0.8 − 1.5 Typ Max Unit V V V V V V V μA μA mA mA mA mA mA mA 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 VOL Output LOW Voltage 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 = 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 http://onsemi.com 3 SN74LS669 PARAMETER MEASUREMENT INFORMATION tw(clock) CLOCK INPUT 1.3 V ts LOAD INPUT 1.3 V ts DATA INPUTS A,B,C, and D 1.3 V tw(clock) 3V 1.3 V 1.3 V ts 3V 1.3 V 0V th 3V 1.3 V 0V ts th 1.3 V 3V ts th 1.3 V ts 1.3 V 3V 1.3 V 0V th 0V 1.3 V 1.3 V 0V th ENABLE P or ENABLE T 1.3 V UP/DOWN INPUT 1.3 V VOLTAGE WAVEFORMS 3V ENABLE T INPUT 1.3 V tPHL RIPPLE CARRY OUTPUT 1.3 V 1.3 V 0V tPLH VOL 1.3 V VOH ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). 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