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參數(shù)資料
| 型號： | MAX3110ECNI+G36 |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 15/31頁 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS232 SPI W/CAP 28-DIP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 14 |
| 特點： | 收發(fā)器 |
| 通道數(shù)： | 1，UART |
| 規(guī)程： | RS232，RS485 |
| 電源電壓： | 4.5 V ~ 5.5 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
LapLink is a trademark of Traveling Software.
RS-232 Transmitters
The transmitters are inverting-level translators that con-
vert CMOS-logic levels to ±5.0V EIA/TIA-232 levels. The
transmitters guarantee a 230kbps data rate with worst-
case loads of 3k
Ω in parallel with 1000pF, providing
compatibility with PC-to-PC communication software
(such as LapLink). Transmitters can be paralleled
because the outputs are forced into a high-impedance
state when the device is in hardware shutdown
(SHDN = GND). The MAX3110E/MAX3111E permit the
outputs to be driven up to ±12V while in shutdown.
The transmitter inputs do not have pull-up resistors.
Connect unused inputs to GND or VCC.
RS-232 Receivers
The receivers convert RS-232 signals to CMOS-logic
output levels. The MAX3110E/MAX3111E receivers
have inverting outputs and are always active, even
when the part is in hardware (or software) shutdown.
RS-232 Transceiver Hardware Shutdown
Supply current falls to ICCSHDN(H) when in hardware
shutdown mode (SHDN = low). When shut down, the
device’s charge pumps are turned off, V+ is pulled
down to VCC, V- is pulled to ground, and the transmitter
outputs are disabled (high impedance). The time
required to exit shutdown is typically 100s, as shown
in Figure 7. Connect SHDN to VCC if the shutdown
mode is not used. The UART software shutdown does
not affect the RS-232 transceiver.
±15kV ESD Protection
As with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against electro-
static discharges encountered during handling and
assembly. The driver outputs and receiver inputs of the
MAX3110E/MAX3111E have extra protection against
static electricity. Maxim’s engineers have developed
state-of-the-art structures to protect these pins against
ESD of ±15kV without damage. The ESD structures
withstand high ESD in all states: normal operation, shut-
down, and powered down. After an ESD event, the
MAX3110E/MAX3111E keep working without latchup,
whereas competing RS-232 products can latch and
must be powered down to remove latchup.
ESD protection is tested in various ways; the transmitter
outputs and receiver inputs devices are characterized
for protection to the following limits:
±15kV using the Human Body Model
±8kV using the Contact-Discharge Method specified
in IEC 1000-4-2
±15kV using the Air-Gap Method specified in IEC
1000-4-2
ESD Test Conditions
ESD performance depends on a variety of conditions.
Contact Maxim’s Quality Assurance (QA) group for a
reliability report that documents test setup, methodolo-
gy, and results.
Human Body Model
Figure 8a shows the Human Body Model, and Figure
8b shows the current waveform it generates when dis-
charged into a low impedance. This model consists of a
100pF capacitor charged to the ESD voltage of inter-
est, which is then discharged into the test device
through a 1.5k
Ω resistor.
IEC 1000-4-2
The IEC 1000-4-2 standard covers ESD testing and
performance of finished equipment; it does not specifi-
cally refer to integrated circuits. The MAX3110E/
MAX3111E help you design equipment that meets
Level 4 (the highest level) of IEC 1000-4-2 without the
need for additional ESD-protection components.
The major difference between tests done using the
Human Body Model and IEC 1000-4-2 is higher peak
current in IEC 1000-4-2, because series resistance is
lower in the IEC 1000-4-2 model. Hence, the ESD that
withstands voltage measured to IEC 1000-4-2 is gener-
ally lower than that measured using the Human Body
Model. Figure 9a shows the IEC 1000-4-2 model, and
Figure 9b shows the current waveform for the ±8kV
IEC 1000-4-2 Level 4 ESD contact-discharge test.
40
μs/div
SHDN
T2OUT
T1OUT
5V/div
0
2V/div
0
VCC = 3.3V
Figure 7. MAX3111E Transmitter Outputs Exiting Shutdown or
Powering Up
22
Maxim Integrated
MAX3110E/MAX3111E
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