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參數(shù)資料
| 型號： | M491B1 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | SINGLE-CHIP VOLTAGE SYNTHESIS TUNING SYSTEM WITH 1 ANALOG CONTROL |
| 中文描述： | 單片電壓合成調(diào)諧系統(tǒng)的1個模擬控制 |
| 文件頁數(shù)： | 4/16頁 |
| 文件大?。?/td> | 135K |
| 代理商： | M491B1 |
DC ELECTRICAL CHARACTERISTICS
(continued)
Pin
Symbol
V
IL
V
IH
I
IL
R
Parameter
Test Conditions
Min.
Typ. Max.
Unit
V
V
mA
k
18–19–20
In
}
V3
V2
V1
1.5
3.5
V
DD
= 5.25 V, V
IL
= 0.8 V
–0.4
Pull-up Resistor
30
21–22–23–24
X4
X3
X2
X1
V
OL
V
DD
= 4.75 V, I
OL
= 1 mA
0.4
V
I
O (off)
V
O (off)
= 5.5 V
25
μ
A
25–Mains On En-
able
V
IL
V
IH
I
IL
R
V
OL
I
O
0.8
V
V
2.4
V
DD
= 5.25 V
V
IL
= 0.8 V
V
DD
= 4.75 V, I
OL
= 100
μ
A
V
DD
= 4.75 V, V
O
= 0.7 V
–0.4
mA
k
V
mA
Pull-up Resistor
30
26–Mains On/Off
0.4
–1.6
31–Z2
32–Z1
MPX for
Display Out
V
OL
V
DD
= 4.75 V, I
OL
= 1 mA
0.4
V
I
O (off)
V
DD
= 5.25 V, V
O (off)
= 13.2 V
50
μ
A
37–UHF
38–CATV
39–VHFIII
40–VHFI
V
OL
V
OH
V
IL
V
IH
I
O (off)
V
OL
V
DD
= 4.75 V, I
OL
= 1 mA
V
DD
= 4.75 V, I
OH
= –150
μ
A
3
V
V
V
V
μ
A
V
2.4
0.3
3
V
DD
= 5.25 V, V
O (off)
= 13.2 V
V
DD
= 4.75 V, I
OL
= 20 mA
50
1.5
27-28-29-30-33-
34-35 Display Out
36-Display Out
V
OL
V
IH
V
IL
V
DD
= 4.75 V, I
OL
= 30 mA
1.5
V
V
V
31-Memory 8/16
2.0
0.8
Keyboard
Keyboard
Out
}
B
A
N
D
}
4
DESCRIPTION(All timingsat f
clock
= 500kHz)
PIN 1 : V
SS
The substrateoftheICisconnectedtothispin.This
is the referencepin for all parameters of the IC.
PIN 2 : MEMORY SUPPLYVOLTAGE
A supply voltage of 25
±
1 V has to be appliedto
this pin duringthe modify and read cycles.
MODIFYCYCLE
Amodify cycle consists of three steps :
1.All”1”s arewritten inthebitsoftheselectedword.
2. All bits ofthe selectedword are erased (all ”0”s)
3. The new contentis written.
Thus a constantaging of all thebits of theword is
obtained.
During both write and erase cycles the memory
status is checked continuously ; therefore after
eachwriteorerasepulseareadoperationiscarried
out. The write or the erase operationsare stopped
as soonas the resultof the read operationis valid.
WRITE CYCLE. The peak of the current flowing
through pin 2 during a writeoperation is shown in
fig. 1, while fig. 2 shows the envelopeof the same
current.
The typical write time is 3-4 ms for the first cycles
and increases to about 30 ms after 1000 cycles.
M491B
4/16
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相關(guān)代理商/技術(shù)參數(shù) |
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| M49-20.000-18-30/50/4085 | 制造商:MEC 功能描述:Crystal SMD 20.000MHz HC49S-SMD |
| M49-24.000-18-30/50/4085 | 制造商:MEC Switches A/S 功能描述:Crystal SMD 24.000MHz HC49S-SMD |
| M49-24.576-18-30/50/4085 | 制造商:MEC Switches A/S 功能描述:Crystal SMD 24.576MHz HC49S |
| M49-25.000-18-30/50/4085 | 制造商:MEC 功能描述:Crystal SMD 25.000MHz HC49S-SMD |
| M49-27.000-18-30/50/4085 | 制造商:MEC Switches A/S 功能描述:Crystal SMD 27.000MHz HC49S-SMD |
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