MAX307_EE_ _ .............................................. -40°C to +85°C
MAX307_EA_ _ ............................................ -40°C to +125°C
MAX3077EMSA ............................................ -55°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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.
DC Electrical Characteristics
(V
CC
= 3.3V ±10%, T
A
=T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= 3.3V and T
A
= +25°C.) (Note 1)
PARAMETER
DRIVER
Differential Driver Output
Change in Magnitude of
Differential Output Voltage
Driver Common-Mode Output
Voltage
Change in Magnitude of
Common-Mode Voltage
Input High Voltage
Input Low Voltage
Input Hysteresis
Input Current
Input Impedance First Transition
Input Current
SRL Input High Voltage
SRL Input Middle Voltage
SRL Input Low Voltage
SRL Input Current
Output Leakage (Y and Z)
Full Duplex
I
O
SRL = V
CC
SRL = GND
DE = GND,
V
CC
= GND or 3.6V
V
IN
= +12V
V
IN
= -7V
V
OD
ΔV
OD
V
OC
ΔV
OC
V
IH
V
HYS
I
IN1
I
IN2
V
IL
R
L
= 100Ω (RS422), Figure 1
R
L
= 54Ω (RS485), Figure 1
No load
2
1.5
V
CC
V
CC
V
CC
0.2
V
CC
/2
3
0.2
2
0.8
100
±1
1
10
V
CC
- 0.4
V
CC
x 0.4
10
40
V
CC
x 0.6
0.4
75
-75
125
-100
V
V
V
V
V
mV
µA
kΩ
µA
V
V
V
µA
µA
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
R
L
= 100Ω or 54Ω, Figure 1 (Note 2)
R
L
= 100Ω or 54Ω, Figure 1
R
L
= 100Ω or 54Ω, Figure 1 (Note 2)
DE, DI,
RE,
TXP, RXP, H/F
DE, DI,
RE,
TXP, RXP, H/F
DE, DI,
RE,
TXP, RXP, H/F
DE, DI,
RE
DE
TXP, RXP, H/F internal pulldown
www.maximintegrated.com
Maxim Integrated
│
2
MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
DC Electrical Characteristics (continued)
(V
CC
= 3.3V ±10%, T
A
=T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= 3.3V and T
A
= +25°C.) (Note 1)
PARAMETER
Driver Short-Circuit Output Current
Driver Short-Circuit Foldback
Output Current
Thermal-Shutdown Threshold
Thermal-Shutdown Hysteresis
Input Current (A and B)
RECEIVER
Receiver Differential Threshold
Voltage
Receiver Input Hysteresis
RO Output High Voltage
RO Output Low Voltage
Three-State Output Current at
Receiver
Receiver Input Resistance
Receiver Output Short-Circuit
Current
SUPPLY CURRENT
Supply Current
Supply Current in Shutdown Mode
ESD PROTECTION
ESD Protection for Y, Z, A, and B
Human Body Model
±15
kV
Note 1:
All currents into the device are positive. All currents out of the device are negative. All voltages are referred to device
ground, unless otherwise noted.
Note 2:
ΔV
OD
and ΔV
OC
are the changes in V
OD
and V
OC
, respectively, when the DI input changes state.
Note 3:
The short-circuit output current applies to peak current just prior to foldback current limiting. The short-circuit foldback output
current applies during current limiting to allow a recovery from bus contention.
I
CC
I
SHDN
No load,
RE
= 0, DE = V
CC
No load,
RE
= 0, DE = 0
RE
= V
CC
, DE = GND
0.8
0.8
0.8
0.05
1.5
1.5
1.5
10
µA
mA
No load,
RE
= V
CC
, DE = V
CC
V
TH
ΔV
TH
V
OH
V
OL
-7V ≤ V
CM
≤ 12V
V
A
+ V
B
= 0V
I
O
= -1mA
IO = 1mA
SYMBOL
I
OSD
I
OSDF
T
TSH
I
A, B
DE = GND,
V
CC
= GND or 3.6V
T
TS
CONDITIONS
0 ≤ V
OUT
≤ 12V (Note 3)
-7V ≤ V
OUT
≤ V
CC
(Note 3)
-7V ≤ V
OUT
≤ 1V (Note 3)
MIN
40
-250
20
-20
175
15
V
IN
= +12V
V
IN
= -7V
125
-100
-200
V
CC
- 0.6
-125
15
0.4
±1
96
±80
-50
TYP
MAX
250
-40
UNITS
mA
mA
°C
°C
µA
(V
CC
- 1V) ≤ V
OUT
≤ 12V (Note 3)
mV
mV
V
V
µA
kΩ
mA
I
OZR
R
IN
I
OSR
0 ≤ V
O
≤ V
CC
-7V ≤ V
CM
≤ 12V
0V ≤ V
RO
≤ V
CC
www.maximintegrated.com
Maxim Integrated
│
3
MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
Switching Characteristics
Driver Switching Characteristics
MAX3070E/MAX3071E/MAX3072E/MAX3079E with SRL = UNCONNECTED (250kbps)
(V
CC
= 3.3V ±10%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= 3.3V and T
A
= +25°C.)
PARAMETER
Driver Propagation Delay
Driver Differential Output Rise or
Fall Time
Differential Driver Output Skew
|t
DPLH
- t
DPHL
|
Maximum Data Rate
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable Time from Low
Driver Disable Time from High
Driver Enable from Shutdown to
Output High
Driver Enable from Shutdown to
Output Low
Time to Shutdown
t
DZH
t
DLZ
t
DZL
Figure 4
Figure 5
Figure 5
Figure 4
SYMBOL
t
DPLH
t
DPHL
CONDITIONS
C
L
= 50pF, R
L
= 54Ω, Figures 2 and 3
C
L
= 50pF, R
L
= 54Ω, Figures 2 and 3
C
L
= 50pF, R
L
= 54Ω, Figures 2 and 3
250
2500
2500
100
100
5500
5500
50
200
600
MIN
250
250
350
TYP
MAX
1500
1500
1600
200
UNITS
ns
ns
ns
kbps
ns
ns
ns
ns
ns
ns
ns
t
DR
, t
DF
t
DSKEW
t
DHZ
t
DZH(SHDN)
Figure 4
t
DZL(SHDN)
Figure 5
t
SHDN
Receiver Switching Characteristics
MAX3070E/MAX3071E/MAX3072E/MAX3079E with SRL = UNCONNECTED (250kbps)
C++ 属于面向对象的编程语言，OOP的思想不必多说，特别对于复杂的软件工程来说，利用OOP绝对是事半功倍，相对于传统的C来说； 当然用C来写单片机程序无可厚非，已经延续了一个传统，从大学时学的开始到工作岗位，好多人都是一直用C来做，但是既然Keil支持C++编译， 可以用C++来编写你的代码，可以利用高级语言来结构化，清晰化你的程序，为嘛不用呢！哈哈，个人看法！下面进入正题： C+...[详细]
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