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參數(shù)資料
| 型號(hào)： | MAXT3238 |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 外設(shè)及接口 |
| 英文描述： | Single Supply RS232C Line Driver/Receiver(?????μ?o?RS232C ?o?????????¨???2???2??????) |
| 中文描述： | 單電源RS232C接口線路驅(qū)動(dòng)器/接收器（單電源RS232C接口線收發(fā)器（2發(fā)2收）） |
| 文件頁(yè)數(shù)： | 1/12頁(yè) |
| 文件大?。?/td> | 158K |
| 代理商： | MAXT3238 |
MAXT3238
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
SLLS352 – JUNE 1999
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Meet or Exceed the Requirements of
TIA/EIA-232-F and ITU v.28 Standards
Operate With 3-V to 5.5-V V
CC
Supply
Always-Active Noninverting Receiver
Output (ROUT1B)
Designed to Operate up to 1 Mbit/s
Low Standby Current . . . 1
μ
A Typical
External Capacitors . . . 4
×
0.1
μ
F
Accept 5-V Logic Input With 3.3-V Supply
Designed to be Interchangeable With
Maxim MAX3238C and MAX3238E
RS-232 Bus-Pin ESD Protection Exceeds
±
15-kV Using Human-Body Model (HBM)
Applications
– Battery-Powered Systems, PDAs,
Notebooks, Subnotebooks, Laptops,
Palmtop PCs, Hand-Held Equipment,
Modems, and Printers
Package Options Include Plastic
Small-Outline (DW), Shrink Small-Outline
(DB), and Thin Shrink Small-Outline (PW)
Packages
description
The MAXT3238 devices consist of five line drivers, three line receivers, and a dual charge-pump circuit with
±
15-kV ESD protection pin-to-pin (serial-port connection pins, including GND). These devices provide the
electrical interface between notebook and subnotebook computer applications and meet the requirements of
TIA/EIA-232-F. The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-V
supply. In addition, these devices include an always-active noninverting output (ROUT1B), which allows
applications using the ring indicator to transmit data while the device is powered-down. These devices are
designed to operate at data signaling rates up to 1 Mbit/s, with an increased slew-rate range of 24 V/ s to
150 V/ s.
Flexible control options for power management are available when the serial port is inactive. The
auto-powerdown feature functions when FORCEON is low and FORCEOFF is high. During this mode of
operation, if the devices do not sense a valid RS-232 signal, the driver outputs are disabled. If FORCEOFF is
set low, both drivers and receivers (except ROUT1B) are shut off, and the supply current is reduced to 1
μ
A.
Disconnecting the serial port or placing the peripheral drivers off causes the auto-powerdown condition to occur.
Auto-powerdown can be disabled when FORCEON and FORCEOFF are high. With auto-powerdown enabled,
the devices are activated automatically when a valid signal is applied to any receiver input. The INVALID output
is used to notify the user if an RS-232 signal is present at any receiver input. INVALID is high (valid data) if any
receiver input voltage is greater than 2.7 V or less than –2.7 V or has been between –0.3 V and 0.3 V for less
than 30
μ
s. INVALID is low (invalid data) if any receiver input voltage is between –0.3 V and 0.3 V for more than
30
μ
s. Refer to Figure 4 for receiver input levels.
The MAXT3238C is characterized for operation over the temperature range of 0
°
C to 70
°
C. The MAXT3238I
is characterized for operation over the temperature range of –40
°
C to 85
°
C.
P
Copyright
1999, Texas Instruments Incorporated
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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C2+
GND
C2–
V–
DOUT1
DOUT2
DOUT3
RIN1
RIN2
DOUT4
RIN3
DOUT5
FORCEON
FORECEOFF
C1+
V+
V
CC
C1–
DIN1
DIN2
DIN3
ROUT1
ROUT2
DIN4
ROUT3
DIN5
ROUT1B
INVALID
DB, DW, OR PW PACKAGE
(TOP VIEW)
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