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參數(shù)資料
| 型號(hào)： | MAX3223ECPP |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | Video/Imaging Fixed-Point Digital Signal Processor 548-FCBGA |
| 中文描述： | DUAL LINE TRANSCEIVER, PDIP20 |
| 封裝： | PLASTIC, DIP-20 |
| 文件頁(yè)數(shù)： | 7/16頁(yè) |
| 文件大?。?/td> | 153K |
| 代理商： | MAX3223ECPP |
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M
±15kV ESD-Protected, 1μA, 3.0V to 5.5V, 250kbps,
RS -232 Transc eivers with AutoS hutdown
_______________________________________________________________________________________
7
RS -232 Rec eivers
The MAX3221E/MAX3223E/MAX3243E’s receivers con-
vert RS-232 signals to CMOS-logic output levels. All
receivers have inverting three-state outputs and can be
active or inactive. In shutdown (
FORCEOFF
= low) or in
AutoShutdown, the MAX3221E/MAX3223E’s receivers
are active (Table 1). Drive
EN
high to place the receiv-
er(s) in a high-impedance state. The MAX3243E’s
receivers are high-impedance when the part is in shut-
down (
FORCEOFF
= low).
The MAX3243E features an extra, always-active com-
plementary output (R2OUTB). R2OUTB monitors
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
drops to 0 in shutdown to accommodate peripherals
such as UARTs (Figure 2).
MAX3243E
I/O
CHIP
WITH
UART
CPU
RS-232
POWER-
MANAGEMENT
UNIT OR
KEYBOARD
CONTROLLER
FORCEOFF
FORCEON
INVALID
MAX3243E
T1OUT
R2OUTB
Tx
5k
UART
V
CC
T1IN
THREE-STATED
LOGIC
TRANSITION
DETECTOR
R2IN
PROTECTION
DIODE
R2OUT
FORCEOFF = GND
V
CC
TO
μ
P
Rx
PREVIOUS
RS-232
Tx
UART
SHDN = GND
V
CC
V
CC
GND
Rx
5k
a)
OLDER RS-232: POWERED-DOWN UART DRAWS CURRENT FROM ACTIVE
RECEIVER OUTPUT IN SHUTDOWN.
b)
NEW MAX3243E: IN SHUTDOWN, R2OUTB IS USED TOMONITOR EXTERNAL
DEVICES AND R2OUT IS THREE STATED, ELIMINATING A CURRENT PATH
THROUGH THE UART'S PROTECTION DIODE.
GND
PROTECTION
DIODE
I
I
Figure 1. Interface Under Control of PMU
Figure 2. The MAX3243E detects RS-232 activity when the
UART and interface are shut down.
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|---|---|
| MAX3223ECPP+ | 功能描述:RS-232接口集成電路 3-5.5V 1Mbps Transceiver 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: |
| MAX3223ECPW | 功能描述:RS-232接口集成電路 3-5V MultiCh Line Driver/Receiver 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: |
| MAX3223ECPWG4 | 功能描述:RS-232接口集成電路 3-5V Multich RS-232 Line Driver/Receiver 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: |
| MAX3223ECPWR | 功能描述:RS-232接口集成電路 3-5V MultiCh Line Driver/Receiver 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: |
| MAX3223ECPWRG4 | 功能描述:RS-232接口集成電路 3-5V Multich RS-232 Line Driver/Receiver 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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