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參數(shù)資料
| 型號： | MAX214 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 16-Bit Buffers/Drivers With 3-State Outputs 48-TVSOP -40 to 85 |
| 中文描述： | 可編程DTE/DCE、+5V、RS-232收發(fā)器 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 132K |
| 代理商： | MAX214 |
M
Programmable DT E/DCE,
+5V RS -232 Transc eiver
_______________________________________________________________________________________
7
RS -232 Drivers
With V
CC
= 5V, the typical driver output voltage swing
is ±8V when loaded with a nominal 5k
RS-232
receiver. Under worst-case operating conditions
(including 116kbps data rate, 3k
2500pF load,
V
CC
= 4.5V, maximum rated temperature) the output
swing is guaranteed to meet the ±5V minimum speci-
fied by EIA/TIA-232 and V.28. The open-circuit output
voltage swing ranges from (V+ - 0.6V) to V-.
Input thresholds are both CMOS and TTL compatible.
The inputs of unused drivers can be left unconnected
because 400k
pull-up resistors to V
CC
are included
on-chip. Since all drivers invert, the pull-up resistors
force the outputs of unused drivers low. The input
pull-up resistors typically source 10μA; in shutdown
mode, they are disconnected to reduce supply current.
When in low-power shutdown mode, the driver outputs
are turned off and their leakage current is less than
1μA, even if the transmitter output is back-driven with
voltages up to ±15V.
RS -232 Rec eivers
The receivers convert the RS-232 signals to
CMOS-logic levels. They invert, to match the inversion
of RS-232 drivers. The guaranteed receiver input
thresholds are significantly tighter than the ±3V
thresholds required by the EIA/TIA-232E specification,
V+
GND
MAX214
1μF
V
CC
1μF
Rx
Tx
1μF
C1+
C1-
C2+
C2-
+5V
+5.5V
T
OUT
R
OUT
400k
5k
I
SHDN
0V OR +5.5V
DRIVE
1μF
1μF
3k
+5.5V
R
IN
T
IN
CAPACITORS MAY BE
POLARIZED OR UNPOLARIZED
DTE/DCE
+5.5V
V-
+5.5V
+5.5V
SHDN
HI-Z
Figure 1. MAX214 Shutdown-Current Test Circuit
C1-
IL -
RL -
V+
S1
V -
S2
S5
S6
C1
C3
C2
IL +
RL +
S3
S4
S7
S8
C4
C1+
GND
GND
VCC
VCC
C2-
C2+
120kHz
Figure 2. Charge-Pump Diagram
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| MAX214CPI | 16-Bit Buffers/Drivers With 3-State Outputs 48-TSSOP -40 to 85 |
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| MAX216CWN | Low-Power AppleTalk Interface Transceiver |
| MAX216 | 16-Bit Buffers/Drivers With 3-State Outputs 48-SSOP -40 to 85 |
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