參數(shù)資料
型號(hào)： MC74HC390A
廠商： ON SEMICONDUCTOR
元件分類： 通用總線功能
英文描述： Dual 4-Stage Binary Ripple Counter(雙4位二進(jìn)制紋波計(jì)數(shù)器)
中文描述： 雙4位的二進(jìn)制紋波計(jì)數(shù)器（雙4位二進(jìn)制紋波計(jì)數(shù)器）
文件頁(yè)數(shù)： 5/10頁(yè)
文件大?。?/td> 127K
代理商： MC74HC390A
MC74HC390A
http://onsemi.com
5
TIMING REQUIREMENTS
(Input t
= t
= 6 ns)
NOTE:Information on typical parametric values can be found in Chapter 2 of the ON Semiconductor HighSpeed CMOS Data Book
(DL129/D).
Symbol
Parameter
V
Unit
25 C
85 C
125 C
t
rec
Minimum Recovery Time, Reset Inactive to Clock A or Clock B
6.0
2.0
9
25
11
30
13
40
ns
t
w
Minimum Pulse Width, Clock A, Clock B
2.0
6.0
75
13
95
15
110
19
ns
t
w
Minimum Pulse Width, Reset
2.0
4.5
6.0
75
20
18
95
24
22
110
30
28
ns
f
f
4.5
500
500
500
PIN DESCRIPTIONS
INPUTS
Clock A (Pins 1, 15) and Clock B (Pins 4, 15)
Clock A is the clock input to the
÷
2 counter; Clock B is
the clock input to the
÷
5 counter. The internal flipflops are
toggled by hightolow transitions of the clock input.
CONTROL INPUTS
Reset (Pins 2, 14)
Asynchronous reset. A high at the Reset input prevents
counting, resets the internal flipflops, and forces Q
A
through Q
D
low.
OUTPUTS
Q
A
(Pins 3, 13)
Output of the
÷
2 counter.
Q
B
, Q
C
, Q
D
(Pins 5, 6, 7, 9, 10, 11)
Outputs of the
÷
5 counter. Q
D
is the most significant bit.
Q
A
is the least significant bit when the counter is connected
for BCD output as in Figure 4. Q
B
is the least significant bit
when the counter is operating in the biquinary mode as in
Figure 5.
SWITCHING WAVEFORMS
Q
t
r
t
f
t
PLH
t
PHL
t
TLH
t
THL
V
CC
GND
CLOCK
10%
50%
10%
90%
1/f
max
t
w
t
rec
RESET
Figure 3.
V
CC
GND
V
CC
GND
10%
90%
Q
CLOCK
50%
50%
50%
t
PHL
t
w
Figure 4.
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MC74HC390ADR2 功能描述:計(jì)數(shù)器移位寄存器 2-6V Dual 4-Stage RoHS:否 制造商:Texas Instruments 計(jì)數(shù)器類型: 計(jì)數(shù)順序:Serial to Serial/Parallel 電路數(shù)量:1 封裝 / 箱體:SOIC-20 Wide 邏輯系列: 邏輯類型: 輸入線路數(shù)量:1 輸出類型:Open Drain 傳播延遲時(shí)間:650 ns 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝:Reel
MC74HC390ADR2G 功能描述:計(jì)數(shù)器移位寄存器 2-6V Dual 4-Stage Binary w/Divide-by-2 RoHS:否 制造商:Texas Instruments 計(jì)數(shù)器類型: 計(jì)數(shù)順序:Serial to Serial/Parallel 電路數(shù)量:1 封裝 / 箱體:SOIC-20 Wide 邏輯系列: 邏輯類型: 輸入線路數(shù)量:1 輸出類型:Open Drain 傳播延遲時(shí)間:650 ns 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝:Reel
MC74HC390ADT 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel
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