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參數(shù)資料
| 型號： | MC145442BP |
| 廠商： | MOTOROLA INC |
| 元件分類： | 調(diào)制器/解調(diào)器 |
| 英文描述： | Single-Chip 300-Baud Modem |
| 中文描述： | 0.3 kbps DATA, MODEM, PDIP20 |
| 封裝： | PLASTIC, DIP-20 |
| 文件頁數(shù)： | 2/12頁 |
| 文件大?。?/td> | 111K |
| 代理商： | MC145442BP |
MC145442B
MC145443B
2
MOTOROLA
BLOCK DIAGRAM
* Refer to the FB pin description.
15
16
RxA2
RxA1
LB
MODE
SQT
TxD
TLA
Xout
Xin
9
8
20
11
14
13
2
MODE
CONTROL
MODULATOR
OSCILLATOR
CLOCK
DIVIDER
SAMPLING CLOCK: 77.82 kHz
SAMPLING CLOCK: 19.46 kHz
INTERNAL
VAG
ANALOG
GROUND
GENERATOR
12
6
19
VAG
AAF
S/H
LOW–BAND
BPF
HIGH–BAND
BPF
AC AMP
*
SMOOTHING
FILTER
18
17
ExI
TxA
1
10
DSI
FB
DEMOD
5
RxD
3
CARRIER
DETECT
CD
CDA
CDT
7
4
VDD
VSS
+
–
+
–
ABSOLUTE MAXIMUM RATINGS
(Voltages Referenced to VSS)
Rating
Symbol
Value
Unit
Supply Voltage
VDD
Vin
Vout
IIK, IOK
Iout
PD
TA
Tstg
–0.5 to 7.0
V
DC Input Voltage
–0.5 to VDD + 0.5
–0.5 to VDD + 0.5
±
20
V
DC Output Voltage
V
Clamp Diode Current, per Pin
mA
DC Output Current, per Pin
±
28
mA
Power Dissipation
500
mW
Operating Temperature Range
–40 to 85
°
C
Storage Temperature Range
–65 to 150
°
C
RECOMMENDED OPERATING CONDITIONS
Parameter
Symbol
Min
Max
Unit
Supply Voltage
VDD
Vin, Vout
tr, tf
fcrystal
4.5
5.5
V
DC Input or Output Voltage
0
VDD
500
V
Input Rise or Fall Time
—
ns
Crystal Frequency*
3.2
5.0
MHz
* Changing the crystal frequency from 3.579 MHz will change the output frequencies. The
change in output frequency will be proportional to the change in crystal frequency.
This device contains circuitry to protect the
inputs against damage due to high static volt-
ages or electric fields; however, it is advised that
normal precautions be taken to avoid application
of any voltage higher than maximum rated
voltages to this high impedance circuit. For
proper operation it is recommended that Vin and
Vout be constrained to the range VSS
≤
(Vin or
Vout)
≤
VDD).
Unused inputs must always be tied to an
appropriate logic voltage level (e.g., either VSS
or VDD).
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