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MAX3248EEAI の電気的特性と機能

MAX3248EEAIのメーカーはMaxim Integratedです、この部品の機能は「+3.0V to +5.5V / 10nA / 250kbps RS-232 Transceivers with 15kV ESD-Protected I/O and Logic Pins」です。


製品の詳細 ( Datasheet PDF )

部品番号 MAX3248EEAI
部品説明 +3.0V to +5.5V / 10nA / 250kbps RS-232 Transceivers with 15kV ESD-Protected I/O and Logic Pins
メーカ Maxim Integrated
ロゴ Maxim Integrated ロゴ 




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MAX3248EEAI Datasheet, MAX3248EEAI PDF,ピン配置, 機能
19-1632; Rev 1; 6/01
+3.0V to +5.5V, 10nA, 250kbps RS-232 Transceivers
with ±15kV ESD-Protected I/O and Logic Pins
General Description
The MAX3238E/MAX3248E transceivers use Maxim’s
revolutionary AutoShutdown Plus™ feature to achieve
10nA supply current. These devices shut down the on-
board power supply and drivers when they do not sense
a valid signal transition on either the receiver or transmit-
ter inputs. This occurs if the RS-232 cable is disconnect-
ed or if the transmitters of the connected peripheral are
turned off. The devices turn on again when a valid transi-
tion is applied to any RS-232 receiver or transmitter input.
AutoShutdown Plus automatically achieves this power
savings through its on-board circuitry, as no changes are
required to the existing BIOS or operating system.
All RS-232 inputs and outputs, as well as the logic I/O
pins, have enhanced ESD protection to ±15kV. The addi-
tional ESD protection on the logic I/O pins makes the
MAX3238E/MAX3248E ideal for cell phone data cable
applications because it eliminates the need for costly
external TransZorb™ or protection schemes.
The MAX3238E/MAX3248E contain five drivers and three
receivers and are 3V-powered EIA/TIA-232 and V.28/V.24
communication interfaces intended for cell phones, data
cables, and modem applications. A proprietary, high-effi-
ciency, dual charge-pump power supply and a low-
dropout transmitter combine to deliver true RS-232
performance from a single +3.0V to +5.5V supply. A
guaranteed data rate of 250kbps provides compatibility
with popular software for communicating with personal
computers.
The MAX3238E and the MAX3248E differ only in their
input logic thresholds. The MAX3238E has standard logic
thresholds, while the MAX3248E has low-level logic
thresholds of 0.6V to 1.2V, which are ideal for 1.8V sys-
tems.
The transmitter inputs, FORCEON, and FORCEOFF have
a 400kactive positive feedback resistor. Once driven to
a valid logic level, they will retain this level if the driving
signal is removed or goes high impedance. Unused
transmitter and logic inputs may be left unconnected. The
MAX3238E/MAX3248E can operate with supply voltages
ranging from +3.0V to +5.5V.
Applications
Cellular Data Cables
Modems
Battery-Powered Equipment
Peripherals
Data Cradles
Printers
AutoShutdown Plus is a trademark of Maxim Integrated Products.
TransZorb is a trademark of General Semiconductor Industries, Inc.
Covered by U.S. Patent numbers 4,636,930; 4,679,134;
4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; and other
patents pending.
Features
o Enhanced ESD Protection on RS-232 I/O Pins and
All Logic Pins
±15kV—Human Body Model
±8kV—IEC 1000-4-2 Contact Discharge
±15kV—IEC 1000-4-2 Air-Gap Discharge
o Guaranteed Data Rate: 250kbps
o 10nA Low-Power Shutdown with Receivers Active
o Schmitt Triggers on All Inputs
o Flow-Through Pinout
o Meets EIA/TIA-232 Specifications Down to 3.0V
o Guaranteed 6V/µs Slew Rate
o Low-Level Logic Thresholds (MAX3248E)
o RS-232-Compatible Outputs to 2.7V
Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
MAX3238ECAI
0°C to +70°C
28 SSOP
MAX3238EEAI -40°C to +85°C
28 SSOP
MAX3248ECAI
0°C to +70°C
28 SSOP
MAX3248EEAI -40°C to +85°C
28 SSOP
Typical Operating Circuit appears at end of data sheet.
___________________Pin Configuration
TOP VIEW
C2+ 1
GND 2
C2- 3
V- 4
T1OUT 5
T2OUT 6
T3OUT 7
R1IN 8
R2IN 9
T4OUT 10
R3IN 11
T5OUT 12
FORCEON 13
FORCEOFF 14
MAX3238E
MAX3248E
SSOP
28 C1+
27 V+
26 VCC
25 C1-
24 T1IN
23 T2IN
22 T3IN
21 R1OUT
20 R2OUT
19 T4IN
18 R3OUT
17 T5IN
16 R1OUTB
15 INVALID
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

1 Page





MAX3248EEAI pdf, ピン配列
+3.0V to +5.5V, 10nA, 250kbps RS-232 Transceivers
with ±15kV ESD-Protected I/O and Logic Pins
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +3.0V to +5.5V, C1–C4 = 0.1µF (tested at 3.3V ±5%), C1–C4 = 0.22µF (tested at 3.3V ±10%), C1 = 0.047µF, and
C2–C4 = 0.33µF (tested at 5.0V ±10%), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
Input Leakage Current
Output Leakage Current
Output Voltage Low
CONDITIONS
T_IN, FORCEON, FORCEOFF (Note 2)
Receivers disabled
IOUT = 1.0mA
Output Voltage High
IOUT = -1.0mA
RECEIVER INPUTS
Input Voltage Range
Input Threshold Low
VCC = 3.3V
VCC = 5.0V
Input Threshold High
VCC = 3.3V
VCC = 5.0V
Input Hysteresis
Input Resistance
TA = +25°C
AutoShutdown (FORCEON = GND, FORCEOFF = VCC)
Receiver Input Threshold to
INVALID Output High
Figure 4a
Receiver Input Threshold to
INVALID Output Low
Figure 4a
Positive threshold
Negative threshold
MIN
VCC -
0.6
TYP
9
±0.05
VCC -
0.1
MAX
18
±10
0.4
UNITS
µA
µA
V
V
-25 25 V
0.6 1.0
0.8 1.4
V
1.5 2.4
2.0 2.4
V
0.6 V
3 5 7 k
2.7
V
-2.7
-0.3 0.3 V
INVALID Output Voltage Low
IOUT = 1.0mA
0.4 V
INVALID Output Voltage High
IOUT = -1.0mA
Receiver Positive or Negative
Threshold to INVALID High (tINVH)
Receiver Positive or Negative
Threshold to INVALID Low (tINVL)
Receiver or Transmitter Edge to
Transmitters Enabled (tWU)
Receiver or Transmitter Edge to
Shutdown (tAUTOSHDN)
TRANSMITTER OUTPUTS
Output Voltage Swing
Output Resistance
Output Short-Circuit Current
ESD PROTECTION
ESD Protection (R_IN, T_IN, R_OUT,
T_OUT, FORCEON, FORCEOFF,
INVALID, R_OUTB)
VCC = 5V, Figure 4b
VCC = 5V, Figure 4b
VCC = 5V, Figure 4b (Note 3)
Figure 4b
All transmitter outputs loaded with 3kto ground
VCC = 0, TOUT = ±2V
VCC 3.6V
VCC > 3.6V
IEC 1000-4-2 Air-Gap Discharge Method
IEC 1000-4-2 Contact Discharge Method
Human Body Model
VCC -
0.6
0.3
V
µs
60 µs
25 µs
15 30 60
s
±5.0
300
±5.4
50k
±35
±40
±60
±100
V
mA
±15
±8 kV
±15
_______________________________________________________________________________________ 3


3Pages


MAX3248EEAI 電子部品, 半導体
+3.0V to +5.5V, 10nA, 250kbps RS-232 Transceivers
with ±15kV ESD-Protected I/O and Logic Pins
Table 1. Output Control Truth Table
FORCEON FORCEOFF
AutoShutdown
Plus
OPERATION
STATUS
X0
11
01
X
X
<30s*
01
>30s*
X = Don’t care
*Time since last receiver or transmitter input transition.
Shutdown
(Forced Off)
Normal Operation
(Forced On)
Normal
Operation
(AutoShutdown
Plus)
Shutdown
(AutoShutdown
Plus)
T_OUT
High-Z
Active
Active
High-Z
R_OUT
High-Z
Active
Active
Active
R1OUTB
Active
Active
Active
Active
_______________Detailed Description
Dual Charge-Pump Voltage Converter
The MAX3238E/MAX3248Es’ internal power supply
consists of a regulated dual charge pump that provides
output voltages of +5.5V (doubling charge pump) and
-5.5V (inverting charge pump), regardless of the input
voltage (VCC) over the 3.0V to 5.5V range. The charge
pumps operate in a discontinuous mode: if the output
voltages are less than 5.5V, the charge pumps are
enabled; if the output voltages exceed 5.5V, the charge
pumps are disabled. Each charge pump requires a fly-
ing capacitor (C1, C2) and a reservoir capacitor (C3,
C4) to generate the V+ and V- supplies.
RS-232 Transmitters
The MAX3248E transmitters are inverting level translators
that convert a logic low of 0.6V and logic high of 1.2V to
5.0V EIA/TIA-232 levels. The MAX3238E transmitters are
inverting level translators that convert CMOS-logic levels
to 5.0V EIA/TIA-232 levels. The MAX3238E/MAX3248E
transmitters both guarantee a 250kbps data rate with
worst-case loads of 3kin parallel with 1000pF, provid-
ing compatibility with PC-to-PC communication software
(such as LapLink™). Transmitters can be paralleled to
drive multiple receivers. Figure 1 shows a complete sys-
tem connection.
When FORCEOFF is driven to ground, the transmitters
and receivers are disabled and the outputs go high
impedance, except for R1OUTB. When the Auto-
Shutdown Plus circuitry senses that all receiver and
transmitter inputs are inactive for more than 30s, the
transmitters are disabled and the outputs go into a
high-impedance state, but the receivers remain active.
When the power is off, the MAX3238E/MAX3248E per-
mit the outputs to be driven up to ±12V.
The transmitter inputs, FORCEON and FORCEOFF,
have a 400kactive positive-feedback resistor. Once
driven to a valid logic level, they will retain this level if
the driving signal is removed or goes high-impedance.
Unused transmitter inputs may be left unconnected.
RS-232 Receivers
The receivers convert RS-232 signals to CMOS-logic
output levels. All receivers have inverting three-state
outputs and are inactive in shutdown (FORCEOFF)
(Table 1). The MAX3238E/MAX3248E also feature an
extra, always-active noninverting output, R1OUTB. This
extra output monitors receiver activity while the other
receivers are high impedance, allowing Ring Indicator
to be monitored without forward biasing other devices
connected to the receiver outputs. This is ideal for sys-
tems where VCC is set to 0 in shutdown to accommo-
date peripherals, such as UARTs (Figure 2).
LapLink is a trademark of Traveling Software.
6 _______________________________________________________________________________________

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部品番号部品説明メーカ
MAX3248EEAI

+3.0V to +5.5V / 10nA / 250kbps RS-232 Transceivers with 15kV ESD-Protected I/O and Logic Pins

Maxim Integrated
Maxim Integrated


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