±1 5 k V ES D-P ro t e c t e d , Qu a d , Lo w -P o w e r
RS -2 3 2 Lin e Drive r
_____________________P in De s c rip t io n
3.0V
DRIVER
INPUT
1.5V
PIN
NAME
FUNCTION
0V
T
PHL
T
PLH
1
V
EE
-4.5V to -13.2V Supply Voltage Input
V
OH
2, 4, 5, 9,
10, 12, 13
INPUT_
Driver Inputs
3.3V
3.0V
3, 6, 8, 11 OUTPUT_ Driver Outputs
V
OUT
0V
MAX148E
7
GND
Ground
-3.0V
-3.3V
14
V
CC
+4.5V to +13.2V Supply Voltage Input
t
F2
t
R2
_______________De t a ile d De s c rip t io n
V
OL
The MAX1488E provides ±15kV of ESD protection when
operating or when powered down. After an ESD event,
the MAX1488E will not latch up. Internal slew-rate-limit-
ing circuitry eliminates the need for external capacitors.
The MAX1488E has a guaranteed 120kbps data rate.
t
F1
t
R1
SIGNAL
GENERATOR
R
L
C
L
Ou t p u t s
Tables 1 and 2 describe the output states. The output
voltage level is affected by both the load current and
supply voltage, and is stable over temperature. Refer to
the Typical Operating Characteristics to see how the
output voltage varies with supply voltage, load capaci-
tance, and temperature.
Figure 1. Slew-Rate Test Circuit and Timing Diagram
operation. Maxim’s engineers developed state-of-the-
a rt struc ture s to p rote c t the se p ins a ga inst ESD of
± 15kV, without d a ma g e . Afte r a n ESD e ve nt, the
MAX1488E keeps working without latchup.
Table 1. Driver A Functions
INPUT A
OUTPUTA
ESD p rote c tion c a n b e te s te d in va rious wa ys ; the
transmitter outputs are characterized for protection to
the following:
H
L
L
H
1) ±15kV using the Human Body Model
Table 2. Driver B–D Functions
2) ±6kV using the Contact-Discharge Method specified
in IEC1000-4-2 (formerly IEC801-2)
INPUT_1
INPUT_2
OUTPUT_
H
L
X
H
X
L
L
H
H
3) ± 15kV us ing the Air-Ga p Me thod s p e c ifie d in
IEC1000-4-2 (formerly IEC801-2).
ESD Test Conditions
ESD performance depends on a number of conditions.
Contact Maxim for a reliability report that documents
test setup, methodology, and results.
In p u t s
The driver inputs determine the driver output states
(Tables 1 and 2). Driver inputs B, C, and D have two
inputs. Connect unused inputs to ground or V
.
CC
Human Body Model
Figure 2a shows the Human Body Model, and Figure
2b shows the current waveform it generates when dis-
charged into a low impedance. This model consists of
a 100pF capacitor charged to the ESD voltage of inter-
e s t, whic h is the n d is c ha rg e d into the te s t d e vic e
through a 1.5kΩ resistor.
±1 5 k V ES D P ro t e c t io n
As with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against electro-
static discharges encountered during handling and
assembly. The MAX1488E driver outputs have extra
protection against static electricity found in normal
4
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
