參數(shù)資料
型號: MAX3380ECUP
廠商: MAXIM INTEGRATED PRODUCTS INC
元件分類: 通用總線功能
英文描述: +2.35V to +5.5V, 1レA, 2Tx/2Rx RS-232 Transceivers with 【15kV ESD-Protected I/O and Logic Pins
中文描述: DUAL LINE TRANSCEIVER, PDSO20
封裝: 4.40 MM, 0.65 MM PITCH, TSSOP-20
文件頁數(shù): 9/14頁
文件大小: 257K
代理商: MAX3380ECUP
M
+2.35V to +5.5V, 1μA, 2Tx/2Rx RS-232 Transceivers
with ±15kV ESD-Protected I/O and Logic Pins
_______________________________________________________________________________________
9
By connecting FORCEON and
FORCEOFF
to
INVALID
,
the MAX3380E/MAX3381E are shut down when no valid
receiver level is detected.
V
L
Logic Supply Input
Unlike other RS-232 interface devices where the receiv-
er outputs swing between 0 and V
CC
, the MAX3380E/
MAX3381E feature a separate logic supply input (V
L
)
that sets V
OH
for the receiver and
INVALID
outputs. V
L
also sets the threshold for the transmitter inputs,
FORCEON and
FORCEOFF
. This feature allows a great
deal of flexibility in interfacing to many different types of
systems with different logic levels. Connect this input to
+2.7V
+0.3V
0
-0.3V
-2.7V
TRANSMITTERS ENABLED, INVALID HIGH
INDETERMINATE
AutoShutdown, TRANSMITTERS DISABLED,
1
μ
A SUPPLY CURRENT INVALID LOW
INDETERMINATE
TRANSMITTERS ENABLED, INVALID HIGH
POWERDOWN*
AUTOSHDN
FORCEOFF
FORCEON
* POWERDOWN IS ONLY AN INTERNAL SIGNAL.
IT CONTROLS THE OPERATIONAL STATUS OF
THE TRANSMITTERS AND THE POWER SUPPLIES.
Figure 2d. Power-Down Logic
AUTOSHDN
R_IN
T_IN
R
S
30s
TIMER
EDGE
DETECT
EDGE
DETECT
FORCEOFF
FORCEON
Figure 2c. AutoShutdown Plus Logic
V
L
0
V+
V-
V
CC
0
INVALID
OUTPUT
TRANSMITTER
INPUTS
RECEIVER
INPUTS
}
INVALID
REGION
TRANSMITTER
OUTPUTS
t
AUTOSHDN
t
WU
t
WU
t
INVL
t
INVH
t
AUTOSHDN
Figure 4. AutoShutdown Plus/
INVALID
Timing Diagram
Figure 3. AutoShutdown Trip Levels
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