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MAX3243ECAI+ Datasheet

  • MAX3243ECAI+

  • IC RS232 TRANSCEIVER 250KBPS 5.5V SSOP28; Device Type:RS232 ...

  • 310.00KB

  • 18頁

  • Maxim   Maxim

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1碌A(chǔ) Supply-Current, True +3V to +5.5V
RS-232 Transceivers with AutoShutdown
MAX3221/MAX3223/MAX3243
POWER
MANAGEMENT
UNIT OR
KEYBOARD
CONTROLLER
FORCEOFF
FORCEON
INVALID
PROTECTION
DIODE
V
CC
MAX3243
V
CC
Rx
UART
Tx
I/O
CHIP
WITH
UART
GND
RS-232
SHDN = GND
I
PREVIOUS
RS-232
5k
CPU
(a)
OLDER RS-232: POWERED-DOWN UART DRAWS CURRENT FROM ACTIVE
RECEIVER OUTPUT IN SHUTDOWN.
V
CC
TO
碌P
LOGIC
TRANSITION
DETECTOR
Figure 1. Interface Under Control of PMU
I
PROTECTION
DIODE
MAX3243
RS-232 Receivers
The MAX3221/MAX3223/MAX3243鈥檚 receivers convert
RS-232 signals to CMOS-logic output levels. All
receivers have one inverting three-state output. In shut-
down (FORCEOFF = low) or in AutoShutdown, the
MAX3221/MAX3223鈥檚 receivers are active (Table 1).
Driving
EN
high places the receiver(s) in a high-imped-
ance state. The MAX3243鈥檚 receivers are high imped-
ance when the part is shut down.
The MAX3243 has an always-active complementary
output (R2OUTB). R2OUTB is an extra output that mon-
itors receiver activity while the other receivers are high
impedance. This allows Ring Indicator to be monitored
without forward biasing other devices connected to the
receiver outputs. This is ideal for systems where V
CC
is
set to 0V in shutdown to accommodate peripherals,
such as UARTs (Figure 2).
V
CC
Rx
UART
R2OUTB
R2OUT
THREE-STATED
5k
R2IN
Tx
GND
T1IN
FORCEOFF = GND
T1OUT
(b)
NEW MAX3243: IN SHUTDOWN, R2OUTB IS USED TO MONITOR EXTERNAL
DEVICES AND R2OUT IS THREE STATED, ELIMINATING A CURRENT PATH
THROUGH THE UART'S PROTECTION DIODE.
Figure 2. The MAX3243 detects RS-232 activity when the
UART and interface are shut down.
6
_______________________________________________________________________________________

MAX3243ECAI+ 產(chǎn)品屬性

  • Lead (SnPb) Finish for COTSObsolescence Mitigation Program

  • 46

  • 集成電路 (IC)

  • 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器

  • -

  • 收發(fā)器

  • 3/5

  • RS232

  • 3 V ~ 5.5 V

  • 表面貼裝

  • 28-SSOP（0.209"，5.30mm 寬）

  • 28-SSOP

  • 管件

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