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| MC74F779 8-BIT BIDIRECTIONAL BINARY COUNTER (3-STATE) The MC74F779 is a fully synchronous 8-stage up/down counter with multiplexed 3-state I/O ports for bus-oriented applications. All control functions (hold, count up, count down, synchronous load) are controlled by two mode pins (S0, S1). The device also features carry look-ahead for easy cascading. All state changes are initiated by the rising edge of the clock. When CET is High the data outputs are held in their current state and TC is held high. The TC output is not recommended for use as a clock or asynchronous reset due to the possibility of decoding spikes. * Multiplexed 3-State I/O Ports For Bus-oriented Applications * Built-In Look-Ahead Carry Capability * Count Frequency 145 MHz Typ * Supply Current 90 mA Typ * Fully Synchronous Operation * 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 F579 for 20-Pin Version * ESD Protection > 4000 Volts PIN ASSIGNMENT I/O0 16 CP 15 CET 14 VCC 13 TC 12 S0 11 S1 10 OE 9 16 1 8-BIT BIDIRECTIONAL BINARY COUNTER (3-STATE) J SUFFIX CERAMIC CASE 620-09 16 1 N SUFFIX PLASTIC CASE 648-08 16 1 D SUFFIX SOIC CASE 751B-03 1 I/O1 2 I/O2 3 I/O3 4 GND 5 I/O4 6 I/O5 7 I/O6 8 I/O7 ORDERING INFORMATION MC74FXXXJ MC74FXXXN MC74FXXXD Ceramic Plastic SOIC LOGIC SYMBOL 11 S0 14 15 9 CET CP OE 10 S1 TC 12 I/O0 I/O1 I/O2 I/O3 I/O4 I/O5 I/O6 I/O7 2 3 4 5 6 7 8 9 GUARANTEED OPERATING RANGES Symbol VCC TA IOH Supply Voltage Operating Ambient Temperature Range Output Current -- High I/O0-I/O7 TC Output Current -- Low I/O0-I/O7 TC 74 20 Parameter 74 74 74 -1.0 24 mA Min 4.5 0 Typ 5.0 25 Max 5.5 70 -3.0 mA Unit V C IOL FAST AND LS TTL DATA 4-252 MC74F779 FUNCTION TABLE S1 X X L (not LL) H L H = High voltage level L = Low voltage level X = Don't care = Low-to-High clock transition (not LL) = S1 and S2 should never be Low voltage level at the same time in the hold mode only. S0 X X L CET X X X H OE H L H X X X CP X X I/Oa to I/Oh in Hi-Z Operating Mode Flip-flop outputs appear on I/O lines Parallel load all flip-flops Hold (TC held High) Count up Count Down L H L L DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) 74F Symbol Parameter 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 Output Short Circuit Current (Note 3) ICCH ICC Total Supply Current (total) ICCL ICCZ I/On -600 -60 -80 82 91 97 -150 116 128 136 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 VCC = 5.5 V 0.35 0.5 V 2.7 3.3 V 3.3 3.4 Min 2.5 V Typ (Note 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 mA 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. FAST AND LS TTL DATA 4-253 MC74F779 AC ELECTRICAL CHARACTERISTICS 74F TA = +25C VCC = +5.0 V CL = 50 pF Symbol fMAX tPLH tPHL tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ Parameter Maximum Clock Frequency Propagation Delay CP to I/On Propagation Delay CP to TC Propagation Delay CET to TC Enable Time from High or Low Level Disable Time from High or Low Level Min 125 4.5 5.5 4.5 4.5 3.0 3.0 2.5 4.5 1.0 1.0 10.5 10.5 9.0 9.0 6.5 7.5 7.0 9.0 6.5 7.0 Typ Max 74F TA = 0C to +70C VCC = +5.0 V 10% CL = 50 pF Min 80 4.5 5.5 4.5 4.5 2.5 2.5 2.5 4.5 1.0 1.0 11 11 10 10 7.5 8.0 8.0 9.5 8.0 8.0 Max Unit MHz 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(H) tw(L) Parameter Set-up time, HIGH or LOW I/On to CP Hold time, HIGH or LOW I/On to CP Set-up time, HIGH or LOW CET to CP Hold time, HIGH or LOW CET to CP Set-up time, HIGH or LOW Sn to CP Hold time, HIGH or LOW Sn to CP Clock Pulse Width Min 5.0 5.0 1.0 1.0 5.0 5.5 0 0 8.0 8.0 0 0 4.0 4.0 Typ Max 74F TA = 0C to +70C VCC = +5.0 V 10% CL = 50 pF Min 5.0 5.0 2.0 2.0 5.0 6.0 0 0 8.5 8.5 0 0 4.0 4.0 Typ Max Unit ns ns ns ns ns ns ns FAST AND LS TTL DATA 4-254 MC74F779 LOGIC DIAGRAM S0 S1 LOAD CONTROL UP DOWN OE I/O0 CP 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 DETAIL A I/O7 CET TC TOGGLE DATA CP MR LOAD D CP Q Q Q Q Detail A FAST AND LS TTL DATA 4-255 |
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