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参数资料
| 型号： | MM74HC942J |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 调制器/解调器 |
| 英文描述： | MM74HC942 is a full duplex low speed modem |
| 中文描述： | 0.3 kbps DATA, MODEM, CDIP20 |
| 封装： | DIP-20 |
| 文件页数： | 3/8页 |
| 文件大小： | 146K |
| 代理商： | MM74HC942J |
AC Electrical Characteristics
Unless otherwise specified, all specifications apply to the MM74HC942 over the range
b
40
§
C to
a
85
§
C using a V
CC
e a
5V
g
10%, a V
BB
e b
5V
g
10% and a 3.579MHz
g
0.1% crystal.
*
Symbol
Parameter
Conditions
Min
Typ
Max
Units
TRANSMITTER
F
CE
Carrier Frequency Error
4
Hz
Power Output
V
CC
e
5.0V
R
TLA
e
0
X
b
3
b
1.5
0
dBm
R
L
e
1.2 k
X
R
TLA
e
5.49 k
X
b
12
b
10.5
b
9
dBm
2nd Harmonic Energy
R
TLA
e
0
X
b
62
b
56
dBm
RECEIVE FILTER AND HYBRID
Hybrid Input Impedance
(Pins 15 and 16)
50
k
X
FTLC Output Impedance
5
10
50
k
X
Adjacent Channel Rejection
RXA2
e
GND TXA
e
GND or V
CC
Input to RXA1
60
dB
DEMODULATOR (INCORPORATING HYBRID, RECEIVE FILTER AND DISCRIMINATOR)
Carrier Amplitude
b
48
b
9
dBm
Bit Jitter
SNR
e
30 dB
Input
e b
38 dBm
100
200
m
S
Baud Rate
e
300 Baud
(
Bit Bias
Alternating 1-0 Pattern
5
10
%
Carrier Detect Trip Points
CDA
e
1.2V
Off to On
b
45
b
42
b
40
dBm
V
CC
e
5.0V
On to Off
b
47
b
45
b
42
dBm
Carrier Detect Hysteresis
V
CC
e
5V
2
3
4
dB
AC Specification Circuit
TL/F/5348–3
3
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| MM74HC942N | MM74HC942 is a full duplex low speed modem |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MM74HC942N | 制造商:NSC 制造商全称:National Semiconductor 功能描述:MM74HC942 is a full duplex low speed modem |
| MM74HC943 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:300 Baud Modem |
| MM74HC943J | 制造商:NSC 制造商全称:National Semiconductor 功能描述:300 Baud Modem |
| MM74HC943N | 制造商:NSC 制造商全称:National Semiconductor 功能描述:300 Baud Modem |
| MM74HCA393M | 制造商:Texas Instruments 功能描述: |
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