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MAX3320TEAP+ Datasheet

  • MAX3320TEAP+

  • RS-232 Transceiver IC; Device Type:Line Driver/Receiver; No....

  • 12頁

  • Maxim   Maxim

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3V to 5.5V, up to 250kbps True RS-232 Transceiver
with 4碌A(chǔ) AutoShutdown Plus and Power-On Reset
MAX3320
MAX3320A/B/L/T
reducing supply current to 4碌A(chǔ). This occurs if the RS-232
cable is disconnected or the connected peripheral trans-
mitters turn off. The system turns on again when a valid
transition occurs at any RS-232 receiver or transmitter
input. As a result, the system saves power without
changes to the existing BIOS or operating system. The
INVALID
output is high when the receivers are active.
Since
INVALID
indicates the receiver inputs鈥?condition, it
can be used in any mode (Figure 2).
Tables 1 and 2 and Figure 2 summarize the MAX3320鈥檚
operating modes. FORCEON and
FORCEOFF
override
the automatic circuitry and force the transceiver into its
normal operating state or into its low-power standby
state. When neither control is asserted, the IC enters
AutoShutdown Plus mode and selects between these
states automatically, based on the last receiver or
transmitter input edge received.
When shut down, the device鈥檚 charge pumps turn off,
V+ decays to V
CC
, V- decays to ground, and the trans-
mitter outputs turn off (high impedance). The time
required to exit shutdown is typically 25碌s (Figure 3a).
+0.3V
R_IN
-0.3V
90碌s
TIMER
R
INVALID
INVALID ASSERTED IF BOTH RECEIVER INPUTS ARE BETWEEN +0.3V AND -0.3V FOR
AT LEAST
90碌s.
Figure 2a. INVALID Functional Diagram,
INVALID
Low
+2.7V
R_IN
-2.7V
90碌s
TIMER
R
INVALID
INVALID DEASSERTED IF EITHER RECEIVER INPUT HAS BEEN BETWEEN +2.7V
AND -2.7V FOR
LESS THAN
90碌s.
Software-Controlled Shutdown
If direct software control is desired, use
INVALID
to indi-
cate DTR or Ring Indicator signal. Connect
FORCEOFF
and FORCEON together to bypass the AutoShutdown
Plus feature so the line acts like a
SHDN
input.
Figure 2b.
INVALID
Functional Diagram,
INVALID
High
EDGE
DETECT
T_IN
FORCEOFF
S
30sec
TIMER
Power-On Reset
In addition to issuing a reset to the microprocessor (碌P)
during power-up, power-down, and brownout condi-
tions, the MAX3320 is relatively immune to short-
duration, negative-going V
CC
transitions (glitches).
Typically, a V
CC
transient that goes 100mV below the
reset threshold and lasts 20碌s or less does not cause a
reset pulse (see
Typical Operating Characteristics).
Additional bypass capacitance mounted as close as
possible to the V
CC
pin provides additional transient
immunity.
R_IN
EDGE
DETECT
FORCEON
AUTOSHDN
R
Figure 2c. AutoShutdown Plus Logic
FORCEOFF
POWERDOWN*
Table 2.
INVALID
Truth Table
RS-232 SIGNAL PRESENT AT
RECEIVER INPUT
Yes
No
INVALID
OUTPUT
H
L
FORCEON
AUTOSHDN
* POWERDOWN IS ONLY AN INTERNAL SIGNAL.
IT CONTROLS THE OPERATIONAL STATUS OF
THE TRANSMITTERS AND THE POWER SUPPLIES.
Figure 2d. Power-Down Logic
_______________________________________________________________________________________
7

MAX3320TEAP+ 產(chǎn)品屬性

  • Lead (SnPb) Finish for COTSObsolescence Mitigation Program

  • 66

  • 集成電路 (IC)

  • 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器

  • -

  • 收發(fā)器

  • 2/2

  • RS232

  • 3 V ~ 5.5 V

  • 表面貼裝

  • 20-SSOP（0.209"，5.30mm 寬）

  • 20-SSOP

  • 管件

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