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| MC74F579 8-BIT BIDIRECTIONAL BINARY COUNTER (3-STATE) The MC74F579 is a fully synchronous 8-stage up/down counter with multiplexed 3-state I/O ports for bus-oriented applications. It features a preset capability for programmable operation, carry look-ahead for easy cascading and a U/D input to control the direction of counting. All state changes, except for the case of asynchronous reset, are initiated by the rising edge of the clock. TC output is not recommended for use as a clock or asynchronous reset due to the possibility of decoding spikes. 8-BIT BIDIRECTIONAL BINARY COUNTER (3-STATE) FASTTM SCHOTTKY TTL * * * * * * * * * * * Multiplexed 3-State I/O Ports For Bus-oriented Applications Built-In Cascading Carry Capability Count Frequency 115 MHz Typ Supply Current 100 mA Typ Fully Synchronous Operation U/D Pin to Control Direction of Counting Separate Pins for Master Reset and Synchronous Reset Center Power Pins to Reduce Effects of Package Inductance See F269 for 24-Pin Separate I/O Port Version See F779 for 16-Pin Version ESD Protection > 4000 Volts PIN ASSIGNMENT MR 20 SR CEP CET VCC TC 19 18 17 16 15 U/D 14 PE 13 CS 12 OE 11 20 1 J SUFFIX CERAMIC CASE 732-03 20 1 N SUFFIX PLASTIC CASE 738-03 20 1 DW SUFFIX SOIC CASE 751D-03 8 9 10 1 2 3 4 5 6 7 CP I/O0 I/O1 I/O2 I/O3 GND I/O4 I/O5 I/O6 I/O7 ORDERING INFORMATION MC74FXXXJ Ceramic MC74FXXXN Plastic MC74FXXXDW SOIC LOGIC SYMBOL 13 PE 1 18 17 11 CP CEP CET OE I/O0 I/O1 I/O2 I/O3 I/O4 I/O5 I/O6 I/O7 2 3 4 5 6 7 8 9 12 CS 20 MR 19 SR 14 U/D TC 15 GUARANTEED OPERATING RANGES Symbol VCC TA IOH IOL Supply Voltage Operating Ambient Temperature Range Output Current -- High Output Current -- Low TC I/On TC I/On Parameter Min 4.5 0 Typ 5.0 25 Max 5.5 70 -1.0 -3.0 20 24 Unit V C mA mA FAST AND LS TTL DATA 4-229 MC74F579 FUNCTION TABLE MR X X X L H H H H H H SR X X X X L H H H H H CS H L L X X L PE X H H X X L CEP X X X X X X H X L L CET X X X X X X X H L L U/D X X X X X X X X H L OE X H L X X X X X X X CP X X X X Function I/O0 to I/O7 in Hi-Z (PE disabled) I/O0 to I/O7 in Hi-Z Flip-Flop outputs appear on I/O lines Asynchronous reset for all flip-flops Synchronous reset for all flip-flops Parallel load all flip-flops Hold Hold (TC held high) Count up Count down (not LL) (not LL) (not LL) (not LL) H = High voltage level L = Low voltage level X = Don't care = Low-to-High clock transition (not LL) = CS and PE should never both be low voltage at the same time DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) 74F Symbol Parameter Min 2.5 TC 2.7 VOH Output HIGH Voltage 2.4 I/On TC VOL VIK Output LOW Voltage I/On Input Clamp Diode Voltage I/On others IIH Input HIGH Current I/On others IIL IOZH IOZL IOS Input LOW Current OFF-State Current High-Level Voltage Applied OFF-State Current Low-Level Voltage Applied I/On -600 - 60 -80 95 105 105 -150 135 145 150 mA VCC = MAX mA Except I/On 70 20 -0.6 70 A VCC = 5.5 V VOUT = 0.5 V VCC = MAX, VOUT = 0 V -0.73 - 1.2 1.0 100 V mA A A mA VCC = 5.5 V 0.35 0.5 V 2.7 3.3 V 3.3 3.4 V Typ (2) Max Unit Test Conditions (Note 1) IOH = - 1.0 mA VIL = MAX VIH = MIN IOH = - 3.0 mA VIL = MAX VIH = MIN IOL = 20 mA IOL = 24 mA VCC = 4.5 V VCC = 4.75 V VCC = 4.5 V VCC = 4.75 V VCC = 4.5 V VIL = MAX VIH = MIN VCC = 4.5 V, IIN = - 18 mA VIN = 5.5 V VIN = 7.0 V VCC = 5.5 V, VIN = 2.7 V VCC = 5.5 V, VIN = 0.5 V VOUT = 2.7 V Output Short Circuit Current (Note 3) ICCH ICC Total Supply Current (total) ICCL ICCZ NOTES: 1. For conditions shown as MIN or MAX, use the appropriate value specified under guaranteed operating conditions for the applicable device type. 2. All typical values are at VCC = 5.0 V, TA = 25C. 3. Not more than one output should be shorted at a time. For IOS testing, the use of high-speed test apparatus and/or sample-and-hold techniques are preferable in order to minimize internal heating and more accurately reflect operational values. Otherwise, prolonged shorting of a HIGH output may raise the chip temperature well above normal and thereby cause invalid readings in other parameter tests. In any sequence of parameter tests, IOS tests should be performed last. FAST AND LS TTL DATA 4-230 MC74F579 AC ELECTRICAL CHARACTERISTICS 74F TA = + 25C VCC = + 5.0 V CL = 50 pF Symbol fMAX tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPHL tPZH tPZL tPHZ tPLZ tPZH tPZL tPHZ tPLZ Parameter Maximum Clock Frequency Propagation Delay CP to I/On Propagation Delay CP to TC Propagation Delay U/D to TC Propagation Delay CET to TC Propagation Delay MR to I/On Output Enable Time to HIGH or LOW Level CS, PE to I/On Output Disable Time to HIGH or LOW Level CS, PE to I/On Output Enable Time to HIGH or LOW Level OE to I/On Output Disable Time to HIGH or LOW Level OE to I/On Min 100 5.0 5.0 4.5 5.5 3.5 4.5 3.5 3.5 5.0 4.5 6.5 3.0 4.0 4.0 6.0 1.0 2.5 10.5 10.5 10 10 8.0 8.0 7.0 8.0 10 10.5 10.5 7.5 9.5 8.5 9.5 6.0 7.0 Typ Max 74F TA = 0C to + 70C VCC = +5.0 V 10% CL = 50 pF Min 80 5.0 5.0 4.5 5.0 3.5 4.5 3.5 3.5 5.0 4.5 6.0 3.0 4.0 4.0 5.0 1.0 2.5 11.5 11.5 11 11 9.0 9.0 8.5 8.5 11 11.5 11.5 9.0 11 9.5 10.5 6.5 8.0 Max Unit MHz ns ns ns ns ns ns ns ns ns AC SETUP REQUIREMENTS 74F TA = + 25C VCC = + 5.0 V CL = 50 pF Symbol ts(H) ts(L) th(H) th(L) ts(H) ts(L) th(H) th(L) ts(H) ts(L) th(H) th(L) tw tw(L) trec Parameter Setup Time, HIGH or LOW I/On to CP Hold Time, HIGH or LOW I/On to CP Setup Time, HIGH or LOW PE, SR or CS to CP Hold Time, HIGH or LOW PE, SR or CS to CP Setup Time, HIGH or LOW CET, CEP to CP Hold Time, HIGH or LOW CET, CEP to CP CP Pulse Width MR Pulse Width MR Recovery Time Min 3.0 3.0 1.0 1.0 9.5 9.5 0 0 5.0 9.0 0 0 4.5 3.5 4.0 Typ Max Min 4.0 4.0 1.0 1.0 10 10 0 0 5.5 10.5 0 0 6.0 4.5 4.5 74F TA = 0C to + 70C VCC = +5.0 V 10% CL = 50 pF Typ Max Unit ns ns ns ns ns ns ns ns ns FAST AND LS TTL DATA 4-231 MC74F579 LOGIC DIAGRAM SR PE CE OE I/O0 LOAD CONTROL CPMR DETAIL A I/O1 DETAIL A I/O2 DETAIL A I/O3 DETAIL A I/O4 DETAIL A I/O5 DETAIL A I/O6 DETAIL A I/O7 U/D CEP CET DETAIL A DOWN UP TC TOGGLE DATA CP MR MR LOAD D CP Q Q Q Q Detail A FAST AND LS TTL DATA 4-232 |
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