MC74F779 fully synchronous 8-stage up/down counter with multiplexed 3-

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MC74F779 fully synchronous 8-stage up/down counter with multiplexed 3-

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MC74F779 8-BIT BIDIRECTIONAL BINARY COUNTER (3-STATE)
MC74F779 fully synchronous 8-stage up/down counter with multiplexed 3-state ports bus-oriented applications. control functions (hold, count count down, synchronous load) controlled mode pins (S0, S1). device also features carry look-ahead easy cascading. state changes initiated rising edge clock. When High data outputs held their current state held high. output recommended clock asynchronous reset possibility decoding spikes. Multiplexed 3-State Ports Bus-oriented Applications Built-In Look-Ahead Carry Capability Count Frequency Supply Current Fully Synchronous Operation Separate Pins Master Reset Synchronous Reset Center Power Pins Reduce Effects Package Inductance F269 24-Pin Separate Port Version F579 20-Pin Version Protection 4000 Volts ASSIGNMENT
I/O0
8-BIT BIDIRECTIONAL BINARY COUNTER (3-STATE)
SUFFIX CERAMIC CASE 620-09
SUFFIX PLASTIC CASE 648-08
SUFFIX SOIC CASE 751B-03
I/O1
I/O2
I/O3
I/O4
I/O5
I/O6
I/O7
ORDERING INFORMATION
MC74FXXXJ MC74FXXXN MC74FXXXD Ceramic Plastic SOIC
LOGIC SYMBOL
I/O0 I/O1 I/O2 I/O3 I/O4 I/O5 I/O6 I/O7
GUARANTEED OPERATING RANGES
Symbol Supply Voltage Operating Ambient Temperature Range Output Current High I/O0-I/O7 Output Current I/O0-I/O7 Parameter -1.0 -3.0 Unit
FAST DATA 4-252
MC74F779
FUNCTION TABLE
(not
High voltage level voltage level Don't care Low-to-High clock transition (not should never voltage level same time hold mode only.
I/Oa I/Oh Hi-Z
Operating Mode
Flip-flop outputs appear lines Parallel load flip-flops Hold held High) Count Count Down
CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Symbol Parameter Output HIGH Voltage I/On Output Voltage I/On Input Clamp Diode Voltage I/On others Input HIGH Current I/On others IOZH IOZL Input Current OFF-State Current High-Level Voltage Applied OFF-State Current Low-Level Voltage Applied Output Short Circuit Current (Note ICCH Total Supply Current (total) ICCL ICCZ I/On -600 -150 Except I/On -0.6 VOUT MAX, VOUT -0.73 -1.2 0.35 (Note Unit Test Conditions (Note IOH= -1.0 -3.0 VIL= 4.75 4.75
VOUT
NOTES: conditions shown MAX, appropriate value specified under guaranteed operating conditions applicable device type. typical values 25°C. more than output should shorted time.
FAST DATA 4-253
MC74F779
ELECTRICAL CHARACTERISTICS
+25°C +5.0 Symbol fMAX tPLH tPHL tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ Parameter Maximum Clock Frequency Propagation Delay I/On Propagation Delay Propagation Delay Enable Time from High Level Disable Time from High Level 10.5 10.5 +70°C +5.0 ±10% Unit
SETUP REQUIREMENTS
+25°C +5.0 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 I/On Hold time, HIGH I/On Set-up time, HIGH Hold time, HIGH Set-up time, HIGH Hold time, HIGH Clock Pulse Width +70°C +5.0 ±10% Unit
FAST DATA 4-254
MC74F779
LOGIC DIAGRAM
LOAD CONTROL DOWN I/O0
DETAIL
I/O1
DETAIL
I/O2
DETAIL
I/O3
DETAIL
I/O4
DETAIL
I/O5
DETAIL
I/O6
DETAIL
DETAIL I/O7
TOGGLE DATA
LOAD
Detail
FAST DATA 4-255

MC74F779 fully synchronous 8-stage up/down counter with multiplexed 3-

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