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參數(shù)資料
| 型號(hào)： | MC145745FW |
| 廠商： | MOTOROLA INC |
| 元件分類： | 調(diào)制器/解調(diào)器 |
| 英文描述： | V.21/V.23 Telemeter Modem |
| 中文描述： | 1.2 kbps DATA, MODEM, PDSO28 |
| 封裝： | SOIC-28 |
| 文件頁數(shù)： | 4/16頁 |
| 文件大?。?/td> | 172K |
| 代理商： | MC145745FW |
MC145745
4
MOTOROLA
PIN DESCRIPTIONS (continued)
Pin
Location
Description
Type
Symbol
25
TxA2
O
Transmit Buffer Output 2 (Inverting) — This pin is the inverting output of the line driver. When VCC =
5 V, + 7 dBm (typ), differential output voltage (VTxA1 – VTxA2), can be obtained with a load of 1.2 k
between pins TxA1 and TxA2. In typical applications, the output level on the telephone line will be half
of the differential output (refer to
Application Circuit
).
26
TxA1
O
Transmit Buffer Output 1 (Non–Inverting) — This pin is the non–inverting output of the line driver.
Refer to TxA2.
27
RxA
I
Receive Signal Input — This pin is the analog signal input which has 500 k
input resistance (typ).
ABSOLUTE MAXIMUM RATINGS
Rating
Symbol
Value
Unit
DC Supply Voltage
VCC
Vin
Vout
Iin
Iout
PD
Tstg
– 0.5 to + 7.0
V
DC Input Voltage
– 0.5 to VCC + 0.5
– 0.5 to VCC + 0.5
±
20
V
DC Output Voltage
V
DC Input Current
mA
DC Output Current
±
25
mA
Power Dissipation
500
mW
Storage Temperature Range
– 65 to + 150
°
C
RECOMMENDED OPERATIONAL CONDITIONS
Parameter
Symbol
Min
Typ
Max
Unit
DC Supply Voltage
VCC
Vin
Vout
fosc
3.3
5.0
5.5
V
DC Input Voltage
0
—
VCC
VCC
—
V
DC Output Voltage
0
—
V
Crystal Oscillation Frequency
—
3.579545
MHz
External Input Frequency (ECLK)
—
7.15909
—
Operating Temperature Range
TA
– 30
25
+ 85
°
C
DC ELECTRICAL CHARACTERISTICS
(VCC = + 3.3 to + 5.5 V, TA = – 30 to + 85
°
C)
Characteristic
Symbol
Conditions
Min
Typ
Max
Unit
Input Voltage
(TxD, ECLK, RESET,
SCP Rx, SCPCLK,
SCPEN)
High Level
VIH
0.7 x VCC
—
—
V
Low Level
VIL
—
—
1.1
Output Voltage
(RxD CD CLKO
(RxD, CD, CLKO,
PB0–3, SCP Tx)
High Level
VOH
VOL
Vin = VIH or VIL, Iout = 20
μ
A
Vin = VIH or VIL
Iout = 20
μ
A
Iout = 2 mA
VCC – 0.1
VCC – 0.01
—
Low Level
—
—
0.01
—
0.1
0.4
Input Leakage Current
(TxD, ECLK, RESET, SCP Rx,
SCPCLK, SCPEN)
Iin
Vin = VCC or GND
—
±
1.0
±
10.0
μ
A
Quiescent Supply
Current
VCC = 5 V
ICC
FSK Mode, RTLA = 0
TxA1 and TxA2 open
—
7
—
mA
DTMF Receive Mode, no input
—
9
—
VCC = 3.6 V
ICC
FSK Mode, RTLA = 0
TxA1 and TxA2 open
—
6
—
DTMF Receive Mode, no input
—
8
—
Power–Down Supply Current
ICC
Power–Down Mode 1
—
—
500
μ
A
Power–Down Mode 2
—
—
1.0
μ
A
This device contains circuitry to protect the
inputs against damage due to high static
voltages or electric fields. However, it is advised
that normal precautions be taken to avoid ap-
plications 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 GND
Vout)
VCC.
Reliability of operation is enhanced if unused
logic inputs are tied to an appropriate logic volt-
age level (e.g., either GND or VCC).
(Vin or
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