MC74F579 查看數據表（PDF） - Motorola => Freescale
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MC74F579 Datasheet PDF : 4 Pages
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8-BIT BIDIRECTIONAL
BINARY COUNTER (3-STATE)
The MC74F579 is a fully synchronous 8-stage up/down counter with multi-
plexed 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.
• 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 SR CEP CET VCC TC U/D PE CS OE
20 19 18 17 16 15 14 13 12 11
MC74F579
8-BIT BIDIRECTIONAL
BINARY COUNTER (3-STATE)
FAST™ SCHOTTKY TTL
20
1
20
1
20
1
J SUFFIX
CERAMIC
CASE 732-03
N SUFFIX
PLASTIC
CASE 738-03
DW SUFFIX
SOIC
CASE 751D-03
1 2 3 4 5 6 7 8 9 10
CP I/O0 I/O1 I/O2 I/O3 GND I/O4 I/O5 I/O6 I/O7
LOGIC SYMBOL
13 12 20 19 14
ORDERING INFORMATION
MC74FXXXJ Ceramic
MC74FXXXN Plastic
MC74FXXXDW SOIC
1 CP
PE CS MR SR U/D
18 CEP
17 CET
TC 15
11 OE
I/O0 I/O1 I/O2 I/O3 I/O4 I/O5 I/O6 I/O7
2345 6 78 9
GUARANTEED OPERATING RANGES
Symbol
Parameter
VCC
TA
Supply Voltage
Operating Ambient Temperature Range
IOH
Output Current — High
IOL
Output Current — Low
Min
Typ
Max
Unit
4.5
5.0
5.5
V
0
25
70
°C
TC
–1.0
mA
I/On
–3.0
TC
20
mA
I/On
24
FAST AND LS TTL DATA
4-229
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