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參數(shù)資料
| 型號： | MAX3212* |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | +2.7V to +3.6V Powered.1µ.A Supply Current.3-Driver/5-Receiver.True RS-232 Transceiver |
| 文件頁數(shù)： | 5/12頁 |
| 文件大?。?/td> | 122K |
_______________Detailed Desc ription
The MAX3212 line driver/receiver is intended for 3V-
powered EIA/TIA-232E and V.28/V.24 communications
interfaces where 3 drivers and 5 receivers are required.
The operating voltage range extends from 3.6V down to
2.7V while still maintaining true RS-232 and EIA/TIA-562
transmitter output voltage levels.
The circuit comprises three sections: power supply,
transmitters, and receivers. The power-supply section
converts the supplied 3V to about ±6.5V, to provide
the voltages necessary for the drivers to meet true RS-
232 levels. External components are small and inex-
pensive.
The transmitters and receivers are guaranteed to oper-
ate at data rates of 235kbps.
The MAX3212 is equipped with Maxim’s new propri-
etary AutoShutdown circuitry. This achieves a supply
current of 1μA by shutting down the device when the
RS-232 cable is disconnected or when the connected
peripheral transmitters are turned off. While shut down,
all receivers can remain active or can be disabled
under logic control. A complementary receiver remains
active in all cases, enabling a system incorporating the
MAX3212 to remain shut down and still monitor incom-
ing RS-232 activity.
Three-state drivers on all receiver outputs are provided
so that multiple receivers, generally of different inter-
face standards, can be wire-ORed at the UART.
S witc h-Mode Power S upply
The switch-mode power supply uses a single inductor
with two inexpensive diodes and two capacitors to
generate ±6.5V from the 2.7V to 3.6V input. The Typical
Operating Circuitshows the complete circuit for the pow-
er supply.
Use a 15
μ
H inductor with a saturation current rating of at
least 350mA and under 1
resistance. Use 1N6050
diodes or equivalent. Surface-mount equivalents for the
1N6050 include the Motorola MMBD6050LT1, Philips
PMBD6050, and Allegro (formerly Sprague) TMPD6050LT.
For C1 and C2, use ceramic capacitors with values no
less than indicated in the Typical Operating Circuit
These capacitors determine the ripple on V+ and V-, but
M
+2.7V to +3.6V-Powered, 1μA S upply Current,
3-Driver/5-Rec eiver, True RS -232 Transc eiver
_______________________________________________________________________________________
5
______________________________________________________________Pin Desc ription
PIN
1
2
3
NAME
LN
LP
V
CC
FUNCTION
Inductor/Diode Connection Point
Inductor/Diode Connection Point
Supply Voltage Input, 2.7V to 3.6V
4
EN
Receiver Enable Control. Drive EN low to force receiver outputs into a high-Z state. Drive
EN high for normal operation. Cycle EN high then low to reset TRAN. TRAN is always low
when EN is high.
5
TRAN
Transition Detection Output. TRAN latches high when a transition occurs on any receiver
input while EN is low. Reset by cycling the EN pin high then low.
6
INVALID
Output of Invalid Signal Detector. Low if invalid RS-232 levels are present on all
receiver inputs, otherwise high.
7
R5OUTB
R1OUT–R5OUT
T1IN, T2IN, T3IN
V-
T3OUT, T2OUT, T1OUT
R5IN–R1IN
Complementary Output of R5OUT—always active
Receiver Outputs. Swing from GND to V
CC
. High-impedance when EN is low.
Transmitter Inputs
Negative Supply generated on-board
Transmitter Outputs
Receiver Inputs
8–12
13, 14, 15
16
17, 18, 19
20–24
25
FORCEOFF
Drive low to shut down transmitters and on-board power supply, overriding all automatic
circuitry and FORCEON (see Figure 3).
26
FORCEON
Drive high to overide automatic circuitry, keeping transmitters on (see Figure 3).
FORCEOFF = high.
Positive Supply generated on-board
Ground
27
28
V+
GND
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3212CAI | 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3212CAI+ | 功能描述:RS-232接口集成電路 2.7-3.6V 1uA 3-Drvr 5-Receiver Tsvr RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3212CAI+T | 功能描述:RS-232接口集成電路 2.7-3.6V 1uA 3-Drvr 5-Receiver Tsvr RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3212CAI-T | 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3212CWI | 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
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