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PDF MAX14770E Data sheet ( Hoja de datos )
| Número de pieza | MAX14770E | |
| Descripción | High-ESD Profibus RS-485 Transceiver | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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MAX14770E
±35kV High-ESD Profibus RS-485 Transceiver
General Description
The MAX14770E is a half-duplex, Q35kV high ESD-
protected, 20Mbps transceiver for PROFIBUS-DP and
RS-485 applications. In addition, it can be used for
RS-422/V.11 communications. The MAX14770E is
designed to meet IEC 61158-2, TIA/EIA-422-B, TIA/EIA-
485-A, V.11, and X.27 standards.
The MAX14770E is available in an 8-pin SO and an 8-pin
FMAX® specified over the extended temperature range.
It is also available in a tiny TDFN (3mm x 3mm) pack-
age and specified over the automotive (-40NC to +125NC)
temperature range.
PROFIBUS-DP Networks
Industrial Fieldbuses
Motion Controllers
RS-485 Networks
Machine Encoders
Applications
Benefits and Features
S Integrated Protection Increases Robustness
±35kV HBM ESD per JEDEC JS-001-2012
±12kV Contact ESD per IEC 61000-4-2
±15kV Air Gap ESD per IEC 61000-4-2
True Fail-Safe Receiver Prevents False
Transitions on Receiver Input Short or Open
Hot Swap Eliminates False Transitions During
Power-Up or Hot Insertion
Short-Circuit-Protected Outputs
Thermal Shutdown Circuitry Prevents Excessive
Power Dissipation
S Low Current Reduces Power Consumption
15µA Shutdown Current
2.5mA Supply Current Typical with No Load
S Profibus Compliant with Minimum 20Mbps Data
Rate
S Allows Up to 128 Transceivers on the Bus
S -40°C to +125°C Automotive Temperature Range
in Tiny 8-Pin (3mm x 3mm) TDFN
Typical PROFIBUS-DP Operating Circuit appears at end of
data sheet.
Functional Diagram
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
MAX14770EESA+T -40NC to +85NC 8 SO
MAX14770EGSA+T -40NC to +105NC 8 SO
MAX14770EGUA+T -40NC to +105NC 8 FMAX
MAX14770EATA+T -40NC to +125NC 8 TDFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*EP = Exposed pad.
TOP
MARK
—
—
—
BMG
RO R
RE
SHUTDOWN
DE
A
B
DI D
MAX14770E
The PROFIBUS PROCESS FIELD BUS logo is a registered
trademark of PROFIBUS and PROFINET International (PI).
µMAX is a registered trademark of Maxim Integrated Products, Inc.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-5017; Rev 5; 1/15
1 page  
MAX14770E
±35kV High-ESD Profibus RS-485 Transceiver
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V Q10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V, TA = +25NC.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
RECEIVER SWITCHING CHARACTERISTICS
Receiver Propagation
Delay
tRPLH
tRPHL
CL = 15pF; Figures 8 and 9 (Note 7)
Receiver Output
Skew
tRSKEW CL = 15pF; Figures 8 and 9 (Notes 7, 8)
Maximum Data Rate
Receiver Enable to
Output High
tRZH
S2 closed; RL = 1kI, CL = 15pF; Figure 10
Receiver Enable to
Output Low
tRZL S1 closed; RL = 1kI, CL = 15pF; Figure 10
Receiver Disable
Time from Low
tRLZ S1 closed; RL = 1kI, CL = 15pF; Figure 10
Receiver Disable
Time from High
tRHZ
S2 closed; RL = 1kI, CL = 15pF; Figure 10
MIN TYP MAX UNITS
28 ns
2 ns
20 Mbps
30 ns
30 ns
30 ns
30 ns
Receiver Enable from
Shutdown to Output
High
tRZL(SHDN)
S1 closed; RL = 1kI, CL = 15pF; Figure 10
(Notes 6, 7)
100 Fs
Receiver Enable from
Shutdown to Output
Low
tRZH(SHDN)
S2 closed; RL = 1kI, CL = 15pF; Figure 10
(Notes 6, 7)
100 Fs
Time to Shutdown
tSHDN
(Note 6)
50 800 ns
Note 2: Devices are production tested at TA = +25NC. Specifications over temperature limits are guaranteed by design.
Note 3: VODPP is the difference in VOD, with the DI at high and DI at low.
Note 4: DVOD and DVOC are the changes in |VOD| and |VOC|, respectively, with the DI at high and DI at low.
Note 5: The short-circuit output current applies to peak current just prior to foldback current limiting; the short-circuit foldback out-
put current applies during current limiting to allow a recovery from bus contention.
Note 6: Shutdown is enabled by bringing RE high and DE low. If the enable inputs are in this state for less than 50ns, the device
is guaranteed not to enter shutdown. If the enable inputs are in this state for at least 800ns, the device is guaranteed to
have entered shutdown.
Note 7: Capacitive load includes test probe and fixture capacitance.
Note 8: Guaranteed by characterization; not production tested.
Maxim Integrated
5
5 Page 
MAX14770E
±35kV High-ESD Profibus RS-485 Transceiver
TOP VIEW
+
RO 1
RE 2
DE 3
DI 4
MAX14770E
SO/µMAX
8 VCC
7B
6A
5 GND
Pin Configurations
+
RO 1
RE 2
DE 3
DI 4
MAX14770E
*EP
8 VCC
7B
6A
5 GND
TDFN
(3mm × 3mm)
*CONNECT EXPOSED PAD TO GND.
Pin Description
PIN NAME
FUNCTION
1 RO Receiver Output. When RE is low and (A - B) R -50mV, RO is high; if (A - B) P -200mV, RO is low.
2
RE
Receiver Enable. Drive RE low to enable RO; RO is high impedance when RE is high. Drive RE
high and DE low to enter low-power shutdown mode.
3
DE
Driver Enable. Drive DE high to enable driver output. The driver outputs are high impedance when
DE is low. Drive RE high and DE low to enter low-power shutdown mode.
Driver Input. With DE high, a low on DI forces the noninverting output, A, low and the inverting out-
4 DI put, B, high. Similarly, a high on DI forces the noninverting output, A, high and the inverting output,
B, low.
5
GND
Ground
6 A Noninverting Receiver Input and Noninverting Driver Output
7 B Inverting Receiver Input and Inverting Driver Output
8
VCC
Positive Supply. Bypass VCC to GND with a 0.1FF ceramic capacitor as close as possible to the
device.
— EP Exposed Pad (TDFN Only). Connect EP to GND.
Maxim Integrated
11
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