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參數(shù)資料
| 型號(hào)： | MAX3190-MAX3190E |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類(lèi)： | RS-232 |
| 英文描述： | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| 中文描述： | 5V的高速RS - 232收發(fā)器與0.1uF電容 |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大?。?/td> | 154K |
| 代理商： | MAX3190-MAX3190E |
Detailed Description
The MAX3190/MAX3190E are EIA/TIA-232 transmitters
that convert CMOS/TTL logic levels to RS-232 signals.
They operate on ±7.5V to ±12V supplies and feature
enhanced electrostatic discharge protection (see
ESD
Protection
). The MAX3190/MAX3190E guarantee a
460kbps data rate with worst-case loads of 3k
in par-
allel with 1000pF. The MAX3190/MAX3190E invert the
TOUT signal relative to TIN (standard RS-232). The
transmitter input does not have a pullup resistor and
should be connected to GND if unused.
Shutdown
The MAX3190/MAX3190E feature a shutdown input.
Drive
SHDN
low to reduce the supply current to 1μA
(max). Shutdown also forces TOUT into a high-imped-
ance state, allowing the signal line to be safely con-
trolled by other transmitters. Drive
SHDN
high for
normal operation.
ESD Protection
As with all Maxim devices, ESD protection structures are
incorporated on all pins to protect against ESD encoun-
tered during handling and assembly. The MAX3190E
’
s
transmitter output has extra protection against static
electricity. Maxim has developed state-of-the-art struc-
tures enabling this pin to withstand ESD up to ±15kV
without damage or latch-up. The MAX3190E
’
s transmit-
ter output is 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 Discharge method specified
in IEC 1000-4-2
Human Body Model
Figure 2 shows the Human Body Model, and Figure 3
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 interest,
and then discharged into the test device through a
1.5k
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 ICs. The MAX3190E enables the design of
equipment that meets the highest level (Level 4) 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, the ESD
withstand voltage measured to this standard is general-
ly lower than that measured using the Human Body.
Figure 4 shows the IEC 1000-4-2 model, and Figure 5
M
±15kV ESD-Protected, 460kbps,
RS-232 Transmitters in SOT23-6
4
_______________________________________________________________________________________
Pin Description
50%
50%
50%
50%
t
PLH
t
PHL
+10V
-10V
TOUT
TIN
V
IH
V
IL
Figure 1. Transmitter Propagation-Delay Timing
NAME
FUNCTION
1
SHDN
Active-Low Shutdown. Pull low to
reduce the supply current and to force
TOUT into a high-impedance state.
2
GND
Ground
PIN
3
TIN
TTL/CMOS Transmitter Input
4
TOUT
RS-232 Transmitter Output
6
V
CC
Positive Supply Voltage
5
V
EE
Negative Supply Voltage
CHARGE-CURRENT
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
Cs
100pF
R
C
1M
R
D
1500
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
Figure 2. Human Body ESD Test Model
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