LT1331 Просмотр технического описания (PDF) - Linear Technology
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LT1331 Datasheet PDF : 8 Pages
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ESD PROTECTIO
The RS232 line inputs of the LT1331 have on-chip protec-
tion from ESD transients up to ±10kV. The protection
structures act to divert the static discharge safely to
system ground. In order for the ESD protection to function
effectively, the power supply and ground pins of the
LT1331 must be connected to ground through low imped-
ances. The power supply decoupling capacitors and charge
pump storage capacitors provide this low impedance in
normal application of the circuit. The only constraint is that
low ESR capacitors must be used for bypassing and
charge storage. ESD testing must be done with pins VCC,
VL, V+, V – and GND shorted to ground or connected with
low ESR capacitors.
LT1331
ESD Test Circuit
++
0.1µF
RS232
LINE PINS
PROTECTED
TO ±10kV
V+ 1
5V VCC 2
0.1µF +
3
0.2µF 4
DRIVER 1 OUT 5
RX1 IN 6
DRIVER 2 OUT 7
RX2 IN 8
9
RX3 IN
RX4 IN 10
DRIVER 3 OUT 11
RX5 IN (LOW-Q) 12
ON/OFF 13
14
3.3V
LT1331
0.1µF
28 V –
27
0.1µF
26
0.2µF
25 DRIVER 1 IN
24 RX1 OUT
23 DRIVER 2 IN
22 RX2 OUT
21 RX3 OUT
20 RX4 OUT
19 DRIVER 3 IN
18 RX5 OUT (LOW-Q)
17
GND
16
DRIVER DISABLE
15
NC
1331 ESD TC
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PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted.
G Package
28-Lead Plastic SSOP (0.209)
(LTC DWG # 05-08-1640)
0.205 – 0.212**
(5.20 – 5.38)
0° – 8°
0.005 – 0.009
(0.13 – 0.22)
0.022 – 0.037
(0.55 – 0.95)
*DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSIONS DO NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
0.0256
(0.65)
BSC
0.010 – 0.015
(0.25 – 0.38)
0.068 – 0.078
(1.73 – 1.99)
0.002 – 0.008
(0.05 – 0.21)
NW Package
28-Lead PDIP (Wide 0.600)
(LTC DWG # 05-08-1520)
0.397 – 0.407*
(10.07 – 10.33)
28 27 26 25 24 23 22 21 20 19 18 17 16 15
0.301 – 0.311
(7.65 – 7.90)
1 2 3 4 5 6 7 8 9 10 11 12 13 14
G28 SSOP 0694
0.600 – 0.625
(15.240 – 15.875)
0.015
(0.381)
MIN
0.150 ± 0.005
(3.810 ± 0.127)
0.045 – 0.065
(1.143 – 1.651)
0.009 – 0.015
(0.229 – 0.381)
+0.035
0.625 –0.015
0.035 – 0.080
( ) 15.87
+0.889
–0.381
(0.889 – 2.032)
0.125
(3.175)
0.100 ± 0.010
MIN
(2.540 ± 0.254)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
0.070
(1.778)
TYP
1.455*
(36.957)
MAX
28 27 26 25 24 23 22 21 20 19 18 17 16 15
0.018 ± 0.003
(0.457 ± 0.076)
1 2 3 4 5 6 7 8 9 10 11 12 13 14
0.505 – 0.560*
(12.827 – 14.224)
N28 1197
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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