28-Pin SO (derate 12.50mW/°C above +70°C) .....................1W
Operating Temperature Ranges
MAX32_ _C_ _.....................................................0°C to +70°C
MAX32_ _E_ _ .................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1:
V+ and V- can have a maximum magnitude of 7V, but their absolute difference cannot exceed 13V.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
DC CHARACTERISTICS
V
CC
Power-Supply Current
Shutdown Supply Current
Input Logic Threshold Low
(Note 3)
Input Logic Threshold High
(Note 3)
Input Leakage Current
Output Leakage Current
Output Voltage Low
Output Voltage High
RECEIVER INPUTS
Input Voltage Range
Input Threshold Low
Input Threshold High
T
A
= +25°C
T
A
= +25°C
V
CC
= 5.0V
V
CC
= 3.3V
V
CC
= 5.0V
V
CC
= 3.3V
V
CC
= 5.0V
-25
0.6
0.8
1.2
1.5
1.5
1.8
2.4
2.4
25
V
V
V
No load, V
CC
= 3.3V or 5.0V,
T
A
= +25°C
SHDN
= GND, T
A
= +25°C
MAX3222/MAX3232/
MAX3241
MAX3237
0.3
0.5
1.0
1.0
2.0
10
µA
mA
CONDITIONS
MIN
TYP
MAX
UNITS
LOGIC INPUTS AND RECEIVER OUTPUTS
T_IN,
EN, SHDN,
MBAUD
V
CC
= 3.3V
V
CC
= 5.0V
T_IN,
EN, SHDN,
MBAUD
Receivers disabled
I
OUT
= 1.6mA
I
OUT
= -1.0mA
V
CC
- 0.6
V
CC
- 0.1
2.0
2.4
±0.01
±0.05
±1.0
±10
0.4
0.8
V
V
µA
µA
V
V
2
Maxim Integrated
MAX3222/MAX3232/MAX3237/MAX3241
3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232
Transceivers Using Four 0.1µF External Capacitors
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Input Hysteresis
Input Resistance
TRANSMITTER OUTPUTS
Output Voltage Swing
Output Resistance
Output Short-Circuit Current
Output Leakage Current
V
OUT
= ±12V, V
CC
= 0V or 3V to 5.5V, transmitters
disabled
All transmitter outputs loaded with 3kΩ to ground
V
CC
= V+ = V- = 0V, V
OUT
= ±2V
±5.0
300
±5.4
10M
±35
±60
±25
V
Ω
mA
µA
T
A
= +25°C
3
CONDITIONS
MIN
TYP
0.3
5
7
MAX
UNITS
V
kΩ
MOUSE DRIVEABILITY (MAX3241)
Transmitter Output Voltage
T1IN = T2IN = GND, T3IN = V
CC
,
T3OUT loaded with 3kΩ to GND,
T1OUT and T2OUT loaded with 2.5mA each
±5.0
V
TIMING CHARACTERISTICS—MAX3222/MAX3232/MAX3241
(V
CC
= +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Maximum Data Rate
Receiver Propagation Delay
Receiver Output Enable Time
Transmitter Skew
Receiver Skew
CONDITIONS
R
L
= 3kΩ, C
L
= 1000pF, one transmitter switching
R_IN to R_OUT, C
L
= 150pF
Normal operation
t
PHL
t
PLH
MIN
120
TYP
235
0.3
0.3
200
200
300
300
C
L
= 150pF to
1000pF
C
L
= 150pF to
2500pF
6
4
30
V/µs
30
MAX
UNITS
kbps
µs
ns
ns
ns
ns
Receiver Output Disable Time Normal operation
|
t
PHL
- t
PLH
|
|
t
PHL
- t
PLH
|
V
CC
= 3.3V, R
L
= 3kΩ to 7kΩ,
+3V to -3V or -3V to +3V,
T
A
= +25°C, one transmitter
switching
Transition-Region Slew Rate
Maxim Integrated
3
MAX3222/MAX3232/MAX3237/MAX3241
3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232
Transceivers Using Four 0.1µF External Capacitors
TIMING CHARACTERISTICS—MAX3237
(V
CC
= +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
CONDITIONS
R
L
= 3kΩ, C
L
= 1000pF, one transmitter switching,
MBAUD = GND
Maximum Data Rate
V
CC
= 3.0V to 4.5V, R
L
= 3kΩ, C
L
= 250pF,
one transmitter switching, MBAUD = V
CC
V
CC
= 4.5V to 5.5V, R
L
= 3kΩ, C
L
= 1000pF,
one transmitter switching, MBAUD = V
CC
Receiver Propagation Delay
Receiver Output Enable Time
R_IN to R_OUT, C
L
= 150pF
Normal operation
t
PHL
t
PLH
MIN
250
1000
1000
0.15
0.15
200
200
100
25
50
C
L
= 150pF
to 1000pF
MBAUD =
GND
MBAUD =
V
CC
6
24
4
30
150
30
V/µs
µs
ns
ns
ns
ns
ns
kbps
TYP
MAX
UNITS
Receiver Output Disable Time Normal operation
Transmitter Skew
Receiver Skew
|
t
PHL
- t
PLH
|
, MBAUD = GND
|
t
PHL
- t
PLH
|
, MBAUD = V
CC
|
t
PHL
- t
PLH
|
Transition-Region Slew Rate
V
CC
= 3.3V, R
L
= 3Ω to 7kΩ,
+3V to -3V or -3V to +3V,
T
A
= +25°C
C
L
= 150pF to 2500pF,
MBAUD = GND
Note 2:
MAX3222/MAX3232/MAX3241: C1–C4 = 0.1µF tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF tested at 5.0V ±10%.
许多MEMS器件，像加速度计、机械共振器件等，都需要在真空环境下才能实现设计功能。然而检验封装腔体是否达到了所要求的真空程度一直一来都是个棘手的问题。密歇根大学Khalil Najafi教授研究小组的研究人员最近开发出一种用微机械制造方法实现，可以在封装的封帽上完成皮拉尼真空测量的方案。使用这种方法可以完成封装的氦气检漏测试，该成果已发表在IEEE Transactions on Advan...[详细]
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