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參數(shù)資料
| 型號(hào)： | MAX221 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Quadruple Bus Buffer Gates With 3-State Outputs 14-TSSOP -40 to 85 |
| 中文描述： | +5V、1µA、單路RS-232收發(fā)器，帶有AutoShutdown |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大?。?/td> | 110K |
| 代理商： | MAX221 |
M
+5V, 1μA, Single RS-232 Transceiver
with AutoShutdown
4
_______________________________________________________________________________________
Typical Operating Characteristics
(V
CC
= +5V, 250kbps data rate, 0.1μF capacitors, transmitter loaded with 3k
and C
L
, T
A
= +25°C, unless otherwise noted.)
-10
-6
-8
-2
-4
2
0
4
8
6
10
0
1000
2000
3000
4000
5000
TRANSMITTER OUTPUT
VOLTAGE vs. LOAD CAPACITANCE
M
LOAD CAPACITANCE (pF)
T
250kbps
250kbps
120kbps
20kbps
20kbps
120kbps
0
10
20
30
40
50
0
1000
2000
3000
4000
5000
SLEW RATE vs.
LOAD CAPACITANCE
M
LOAD CAPACITANCE (pF)
S
μ
s
+SLEW
-SLEW
0
10
20
30
40
50
0
1000
2000
3000
4000
5000
OPERATING SUPPLY
CURRENT vs. LOAD CAPACITANCE
M
LOAD CAPACITANCE (pF)
Pin Description
S
250kbps
20kbps
120kbps
FUNCTION
PIN
NAME
1
EN
Receiver Enable Control. Drive low for normal operation. Drive high to force the receiver output
(ROUT) into a high-impedance state.
2
C1+
Positive Terminal of the Voltage Doubler Charge-Pump Capacitor
3
V+
Positive Voltage Generated by the Charge Pump
7
V-
Negative Voltage Generated by the Charge Pump
6
C2-
Negative Terminal of the Inverting Charge-Pump Capacitor
5
C2+
Positive Terminal of the Inverting Charge-Pump Capacitor
4
C1-
Negative Terminal of the Voltage Doubler Charge-Pump Capacitor
12
FORCEON
Drive high to override automatic circuitry, keeping transmitter and charge pump on.
FORCEOFF
must be high (Table 1).
11
TIN
TTL/CMOS Transmitter Input
10
INVALID
Output of the Invalid Signal Detector.
INVALID
is pulled low if no valid RS-232 level is present on
the receiver input.
9
ROUT
TTL/CMOS Receiver Output
8
RIN
RS-232 Receiver Input
16
FORCEOFF
Force-Off Input, active low. Drive low to shut down transmitter, receiver, and on-board charge
pump. This overrides all automatic circuitry and FORCEON (Table 1).
15
V
CC
+4.5V to +5.5V Supply Voltage
14
GND
Ground
13
TOUT
RS-232 Transmitter Output
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