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參數(shù)資料
| 型號： | MAX3111ECNI+G36 |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 17/31頁 |
| 文件大小： | 0K |
| 描述： | IC UART SPI COMPAT 28-DIP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 14 |
| 特點： | 收發(fā)器 |
| 通道數(shù)： | 1，UART |
| 規(guī)程： | RS232，RS485 |
| 電源電壓： | 3 V ~ 3.6 V |
| 帶IrDA 編碼器/解碼器： | 是 |
| 帶故障啟動位檢測功能： | 是 |
| 帶CMOS： | 是 |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 28-DIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 28-PDIP |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 1404 (CN2011-ZH PDF) |
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SPI/MICROWIRE-Compatible UART and ±15kV ESD-
Protected RS-232 Transceivers with Internal Capacitors
Ceramic resonators are low-cost alternatives to crystals
and operate similarly, although the Q and accuracy are
lower. Some ceramic resonators are available with inte-
gral load capacitors, which can further reduce cost. The
tradeoff between crystals and ceramic resonators is in
initial-frequency accuracy and temperature drift. Keep
the total error in the baud-rate generator below 1% for
reliable operation with other systems. This is accom-
plished easily with a crystal and, in most cases, is
achieved with ceramic resonators. Table 8 lists different
types of crystals and resonators and their suppliers.
The MAX3110E/MAX3111E’s oscillator supports paral-
lel-resonant mode crystals and ceramic resonators or
can be driven from an external clock source. Internally,
the oscillator consists of an inverting amplifier with its
input, X1, tied to its output, X2, by a bias network that
self-biases the inverter at approximately VCC/2. The
external feedback circuit, usually a crystal from X2 to X1,
provides 180° of phase shift, causing the circuit to oscil-
late. As shown in the
Standard Application Circuit, the
crystal or resonator is connected between X1 and X2,
with the load capacitance for the crystal being the
series combination of C1 and C2. For example, for a
1.8432MHz crystal with a specified load capacitance of
11pF, use capacitors of 22pF on either side of the crystal
to ground. Series-resonant mode crystals have a slight
frequency error, typically oscillating 0.03% higher than
specified series-resonant frequency when operated in
parallel mode.
Note: It is very important to keep crystal, resonator, and
load-capacitor leads and traces as short and direct as
possible. Make the X1 and X2 trace lengths and ground
tracks short, with no intervening traces. This helps mini-
mize parasitic capacitance and noise pickup in the
oscillator, and reduces EMI. Minimize capacitive load-
ing on X2 to minimize supply current. The MAX3110E/
MAX3111E’s X1 input can be driven directly by an
external CMOS clock source. The trip level is approxi-
mately equal to VCC/2. Make no connection to X2 in this
mode. If a TTL or non-CMOS clock source is used, AC-
couple it with a 10nF capacitor to X1. A 2V peak-to-
peak swing on the input is required for reliable
operation.
RS-232 Transmitter Outputs
Exiting Shutdown
Figure 7 shows two RS-232 transmitter outputs exiting
shutdown mode. As they become active, the two trans-
mitter outputs are shown going to opposite RS-232 lev-
els (one transmitter input is high; the other is low). Each
transmitter is loaded with 3k
Ω in parallel with 2500pF.
The transmitter outputs display no ringing or undesir-
able transients as they come out of shutdown. Note that
the transmitters are enabled only when the magnitude
of V- exceeds approximately 3V.
Table 8. Component and Supplier List
Murata North America
ECS International, Inc.
SUPPLIER
CSA1.84MG
ECS-18-13-1
PART
NUMBER
800-831-9172
913-782-7787
PHONE
NUMBER
DESCRIPTION
1.8432
Through-Hole
Ceramic Resonator
1.8432
Through-Hole Crystal
(HC-49/U)
FREQUENCY
(MHz)
47
25
TYPICAL
C1, C2 (pF)
ECS International, Inc.
ECS-36-20-5P
ECS-36-18-4
913-782-7787
3.6864
SMT Crystal
3.6864
Through-Hole Crystal
(HC-49/US)
39
33
AVX/Kyocera
PBRC-3.68B
803-448-9411
3.6864
SMT Ceramic
Resonator
None
(integral)
24
Maxim Integrated
MAX3110E/MAX3111E
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