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 8-BIT BIDIRECTIONAL BINARY COUNTER (3-STATE) J SUFFIX CERAMIC CASE 620-09 16 1 N SUFFIX PLASTIC CASE 648-08 PIN ASSIGNMENT I/O0 CP CET VCC TC S0 S1 OE 16 15 14 13 12 11 10 9 16 1 D SUFFIX SOIC CASE 751B-03 16 1 1 I/O1 2 I/O2 3 I/O3 4 GND 5 I/O4 6 I/O5 8 I/O7 7 I/O6 ORDERING INFORMATION MC74FXXXJ MC74FXXXN MC74FXXXD LOGIC SYMBOL 14 15 9 11 10 S0 S1 CET CP OE TC Ceramic Plastic SOIC 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 Parameter Supply Voltage Operating Ambient Temperature Range IOH Output Current — High IOL Output Current — Low I/O0–I/O7 Min Typ Max Unit 74 4.5 5.0 5.5 V 74 0 25 70 °C –3.0 74 TC I/O0–I/O7 TC FAST AND LS TTL DATA 4-252 mA –1.0 24 74 mA 20 MC74F779 FUNCTION TABLE S1 S0 CET OE CP X X X H X I/Oa to I/Oh in Hi-Z X X X L X Flip-flop outputs appear on I/O lines L L (not LL) Operating Mode X H ↑ Parallel load all flip-flops H X ↑ Hold (TC held High) H L L X ↑ Count up L H L X ↑ Count Down 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. DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) 74F Symbol Min Parameter Typ (Note 2) Max Unit 2.5 TC VOH V 2.7 3.4 2.4 3.3 Output HIGH Voltage I/On V 2.7 3.3 TC VOL Output LOW Voltage VIK Input Clamp Diode Voltage IIH IIL IOZH 0.35 0.5 V I/On –0.73 –1.2 V I/On 1.0 mA others 100 I/On 70 others 20 Except I/On –0.6 OFF-State Current High-Level Voltage Applied IOZL OFF-State Current Low-Level Voltage Applied IOS Output Short Circuit Current (Note 3) ICC Total Supply Current (total) IOH= –1.0 mA VIL = MAX VIH = MIN VCC = 4.5 V IOH = –3.0 mA VIL= MAX VIH = MIN VCC = 4.5 V IOL = 20 mA VCC = 4.5 V VIL = MAX VIH = MIN IOL = 24 mA Input HIGH Current Input LOW Current Test Conditions (Note 1) µA VCC = 5.5 V –80 –150 ICCH 82 116 ICCL 91 128 ICCZ 97 136 VIN = 5.5 V VIN = 7.0 V µA VCC = 5.5 V, VIN = 2.7 V mA VCC = 5.5 V, VIN = 0.5 V µA VCC = 5.5 V VOUT = 2.7 V –600 –60 VCC = 4.75 V VCC = 4.5 V, IIN = –18 mA 70 I/On VCC = 4.75 V VOUT = 0.5 V mA VCC = MAX, VOUT = 0 V mA VCC = MAX 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 = 25°C. 3. Not more than one output should be shorted at a time. FAST AND LS TTL DATA 4-253 MC74F779 AC ELECTRICAL CHARACTERISTICS Symbol 74F 74F TA = +25°C VCC = +5.0 V CL = 50 pF TA = 0°C to +70°C VCC = +5.0 V ±10% CL = 50 pF Min Parameter Typ Max Min Max 80 Unit fMAX Maximum Clock Frequency 125 MHz tPLH tPHL Propagation Delay CP to I/On 4.5 5.5 10.5 10.5 4.5 5.5 11 11 ns tPLH tPHL Propagation Delay CP to TC 4.5 4.5 9.0 9.0 4.5 4.5 10 10 ns tPLH tPHL Propagation Delay CET to TC 3.0 3.0 6.5 7.5 2.5 2.5 7.5 8.0 ns tPZH tPZL Enable Time from High or Low Level 2.5 4.5 7.0 9.0 2.5 4.5 8.0 9.5 ns tPHZ tPLZ Disable Time from High or Low Level 1.0 1.0 6.5 7.0 1.0 1.0 8.0 8.0 ns AC SETUP REQUIREMENTS Symbol Min Parameter 74F 74F TA = +25°C VCC = +5.0 V CL = 50 pF TA = 0°C to +70°C VCC = +5.0 V ±10% CL = 50 pF Typ Max Min Typ Max Unit ts(H) ts(L) Set-up time, HIGH or LOW I/On to CP 5.0 5.0 5.0 5.0 ns th(H) th(L) Hold time, HIGH or LOW I/On to CP 1.0 1.0 2.0 2.0 ns ts(H) ts(L) Set-up time, HIGH or LOW CET to CP 5.0 5.5 5.0 6.0 ns th(H) th(L) Hold time, HIGH or LOW CET to CP 0 0 0 0 ns ts(H) ts(L) Set-up time, HIGH or LOW Sn to CP 8.0 8.0 8.5 8.5 ns th(H) th(L) Hold time, HIGH or LOW Sn to CP 0 0 0 0 ns tw(H) tw(L) Clock Pulse Width 4.0 4.0 4.0 4.0 ns FAST AND LS TTL DATA 4-254 MC74F779 LOGIC DIAGRAM S0 S1 LOAD CONTROL UP CP DOWN OE I/O0 DETAIL A 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 CET TC TOGGLE CP DATA MR LOAD D CP Q Q Detail A FAST AND LS TTL DATA 4-255 Q Q