MAX3110ECWI-T Maxim Integrated, MAX3110ECWI-T Datasheet - Page 23

• Manufacturer Part Number: MAX3110ECWI-T
• Description: UART Interface IC
• Manufacturer: Maxim Integrated
• Type: SPI/MICROWIRE-Compatible UART with Integrated ESD-Protected RS-232 Transceiverr

Specifications of MAX3110ECWI-T

• Number Of Channels: 1
• Data Rate: 250 Kbps
• Supply Voltage - Max: 5.5 V
• Supply Voltage - Min: 4.5 V
• Supply Current: 0.6 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Package / Case: SOIC-28 Wide
• Description/function: SPI/MICROWIRE-Compatible UART with integrated ESD-protected RS-232 transceiver
• Mounting Style: SMD/SMT
• Operating Supply Voltage: 5 V
• Propagation Delay Time Ns: 150 ns

Maxim Integrated
Figure 8a. Human Body ESD Test Model
Figure 9a. IEC 1000-4-2 ESD Test Model
The air-gap test involves approaching the device with a
charged probe. The contact-discharge method connects
the probe to the device before the probe is energized.
The Machine Model for ESD tests all pins using a
200pF storage capacitor and zero discharge resis-
tance. Its objective is to emulate the stress caused by
contact that occurs with handling and assembly during
manufacturing. Of course, all pins require this protec-
tion during manufacturing, not just RS-232 inputs and
outputs. Therefore, after PC board assembly, the
Machine Model is less relevant to I/O ports.
Protected RS-232 Transceivers with Internal Capacitors
VOLTAGE
VOLTAGE
SOURCE
SOURCE
HIGH-
HIGH-
DC
DC
SPI/MICROWIRE-Compatible UART and ±15kV ESD-
CHARGE-CURRENT
CHARGE-CURRENT
LIMIT RESISTOR
LIMIT RESISTOR
50M to 100M
R
1M
R
C
100pF
C
150pF
C s
C s
STORAGE
CAPACITOR
STORAGE
CAPACITOR
RESISTANCE
RESISTANCE
DISCHARGE
DISCHARGE
1500Ω
330Ω
R
R
D
D
Machine Model
DEVICE
DEVICE
UNDER
UNDER
TEST
TEST
MAX3110E/MAX3111E
The MAX3110E/MAX3111E include an oscillator circuit
derived from an external crystal oscillator for baud-rate
generation. For standard baud rates, use a 1.8432MHz
or 3.6864MHz crystal. The 1.8432MHz crystal results
in lower operating current; however, the 3.6864MHz
crystal may be more readily available in surface
mount.
Figure 8b. Human Body Model Current Waveform
Figure 9b. IEC 1000-4-2 ESD Generator Current Waveform
AMPERES
t r = 0.7ns to 1ns
I
P
36.8%
100%
90%
10%
0
100%
0
90%
10%
I
Applications Information
t
RL
30ns
Crystals, Oscillators, and
CURRENT WAVEFORM
TIME
t
DL
60ns
Ceramic Resonators
I r
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
t
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