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參數(shù)資料
| 型號： | MAX214EWI+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 10/12頁 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS-232 PROG 28-SOIC |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 3/5 |
| 規(guī)程： | RS232 |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 28-SOIC W |
| 包裝： | 帶卷 (TR) |
MAX214
Programmable DTE/DCE,
+5V RS-232 Transceiver
_______________________________________________________________________________________
7
RS-232 Drivers
With VCC = 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,
VCC = 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 VCC 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 10A; 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
1A, even if the transmitter output is back-driven with
voltages up to ±15V.
RS-232 Receivers
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
1F
VCC
1F
Rx
Tx
1F
C1+
C1-
C2+
C2-
+5V
+5.5V
TOUT
ROUT
400k
5k
ISHDN
0V OR +5.5V
DRIVE
1F
3k
+5.5V
RIN
TIN
CAPACITORS MAY BE
POLARIZED OR UNPOLARIZED
DTE/DCE
+5.5V
V-
+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
VCC
C2-
C2+
120kHz
Figure 2. Charge-Pump Diagram
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