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參數資料
| 型號： | MC74F579DW |
| 廠商： | MOTOROLA INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | 8-BIT BIDIRECTIONAL BINARY COUNTER (3-STATE) |
| 中文描述： | F/FAST SERIES, SYN POSITIVE EDGE TRIGGERED 8-BIT BIDIRECTIONAL BINARY COUNTER, PDSO20 |
| 封裝： | SOIC-20 |
| 文件頁數： | 1/4頁 |
| 文件大小： | 132K |
| 代理商： | MC74F579DW |
4-229
FAST AND LS TTL DATA
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
CEP CET VCC
18
17
16
15
14
13
1
2
3
4
5
6
7
20
19
8
MR
CP
SR
U/D
TC
PE
I/O0
I/O1I/O2
I/O3
GND I/O4 I/O5
9
10
I/O7
I/O6
12
11
CS
OE
MR
SR
CEP
CET
OE
TC
PE
CS
U/D
CP
I/O0I/O1I/O2I/O3I/O4I/O5I/O6
I/O7
18
17
11
1
2
3
4
5
6
7
8
9
15
20
19
13
12
14
LOGIC SYMBOL
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
VCC
TA
Supply Voltage
4.5
5.0
5.5
V
°
C
Operating Ambient Temperature Range
0
25
70
IOH
Output Current — High
TC
–1.0
mA
I/On
TC
–3.0
IOL
Output Current — Low
20
mA
I/On
24
MC74F579
8-BIT BIDIRECTIONAL
BINARY COUNTER (3-STATE)
FAST
SCHOTTKY TTL
ORDERING INFORMATION
MC74FXXXJ
MC74FXXXN
MC74FXXXDW
Ceramic
Plastic
SOIC
20
1
J SUFFIX
CERAMIC
CASE 732-03
20
1
N SUFFIX
PLASTIC
CASE 738-03
20
1
DW SUFFIX
SOIC
CASE 751D-03
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