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參數資料
| 型號： | MC74F779N |
| 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, PDIP16 |
| 封裝： | 648-08 |
| 文件頁數： | 1/4頁 |
| 文件大小： | 105K |
| 代理商： | MC74F779N |
4-252
FAST AND LS TTL DATA
8-BIT BIDIRECTIONAL
BINARY COUNTER (3-STATE)
The MC74F779 is a fully synchronous 8-stage up/down counter with multi-
plexed 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 asynch-
ronous 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
14
13
12
11
10
9
1
2
3
4
5
6
7
16
15
8
I/O0
I/O1
CP
CET
VCC
TC
S1
S0
OE
I/O2
I/O3
GND
I/O4
I/O5
I/O6
I/O7
LOGIC SYMBOL
11
TC
I/O0I/O1I/O2I/O3I/O4I/O5I/O6
I/O7
2
3
4
5
6
7
8
9
12
CP
OE
CET
15
9
14
S0
S1
10
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
VCC
TA
Supply Voltage
74
4.5
5.0
5.5
V
Operating Ambient Temperature Range
74
0
25
70
°
C
IOH
Output Current — High
I/O0–I/O7
TC
74
–3.0
mA
–1.0
IOL
Output Current — Low
I/O0–I/O7
TC
74
24
mA
20
MC74F779
8-BIT BIDIRECTIONAL
BINARY COUNTER (3-STATE)
J SUFFIX
CERAMIC
CASE 620-09
N SUFFIX
PLASTIC
CASE 648-08
16
1
16
1
ORDERING INFORMATION
MC74FXXXJ
MC74FXXXN
MC74FXXXD
Ceramic
Plastic
SOIC
16
1
D SUFFIX
SOIC
CASE 751B-03
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