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2470 BUS DRIVER / RECEIVER
2470
BUS DRIVER / RECEIVER
The ULQ2470L and ULQ2470M are bi-directional bus driver / receivers designed specifically for automotive applications. They are intended to be used as an interface between a microprocessor and a single-wire multiplex data bus operating from the A-line or battery. Each device consists of a wave-shaped open-collector driver, a pull-up resistor, and an input filter and buffer. Output driver protection circuitry provides output shutdown if currents in excess of 25 to 30 mA occur. Additionally, over-voltage shutdown occurs when the bus voltage exceeds approximately 22 volts.
Data Sheet 27463
ULQ2470M
VCC VS REXT BUS
Rd Rd Td GND
1 2 3 4
8 7 6 5
FUNCTIONAL BLOCK DIAGRAM
Dwg. PP-061
Note that the ULQ2470M (DIP) and the ULQ2470L (SOIC) are electrically identical and share a common terminal number assignment.
ABSOLUTE MAXIMUM RATINGS at T A = 25C
Bus Supply Voltage Range, (VBAT) ......................... -13.5 V to 27 V Logic Supply Voltage Range, (VCC) ............................ -0.3 V to 9.0 V Input Voltage Range, (VBUS ) ........................... -3.0 V to 24 V Operating Temperature Range, TA ............................... -40C to +85C Junction Temperature Range, TJ ................................ -40C to 150C Storage Temperature Range, TS ................................ -65C to 150C
DC EN UE IN ER TF NE OR CR IS FO D
Rd
1
T C UY DL ON RO PE
8
VCC
7
VS
22 k
6
REXT BUS
Rd
2
12
5
Td
3
CURRENT LIMIT
28 V
25
4
GND
Dwg. FP-039
--
FEATURES AND BENEFITS
s s s s s s s s s
Over-Voltage Protection Diode Isolation from both Ground and Supply Reverse-Battery Protection Low Supply Current High Noise Immunity Output Current Limiting Low Standby Current--24 mA Max. Open-Ground Protection Under-Voltage Lockout
2470 BUS DRIVER / RECEIVER
ULQ2470L
Dimensions in Inches (for reference only)
8 0.0098 0.0075
0.1574 0.1497
0.2440 0.2284
0.050 0.016
0.020 0.013
1 0.1968 0.1890
0.050
BSC
0 TO 8
0.0688 0.0532 0.0040 MIN.
Dwg. MA-007-8 in
Dimensions in Millimeters (controlling dimensions)
8 0.25 0.19 6.20 5.80
4.00 3.80
1.27 0.40
0.51 0.33
1 5.00 4.80
1.27
BSC
0 TO 8
1.75 1.35 0.10 MIN.
Dwg. MA-007-8 mm
NOTES: 1. Lead spacing tolerance is non-cumulative. 2. Exact body and lead configuration at vendor's option within limits shown.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 1995, Allegro MicroSystems, Inc.
2470 BUS DRIVER / RECEIVER
ULQ2470M
Dimensions in Inches (controlling dimensions)
0.014 0.008 8 5
0.430 0.280 0.240
MAX
0.300
BSC
1 0.070 0.045
4 0.005 0.400 0.355
MIN
0.210
MAX
0.015
MIN
0.150 0.115 0.022 0.014 0.100
BSC
Dwg. MA-001-8A in
Dimensions in Millimeters (for reference only)
0.355 0.204 8 5
10.92 7.11 6.10
MAX
7.62
BSC
1 1.77 1.15
4 0.13 10.16 9.02
MIN
5.33
MAX
0.39
MIN
3.81 2.93 0.558 0.356 2.54
BSC
Dwg. MA-001-8A mm
NOTES: 1. 2. 3. 4.
Leads 1, 4, 5, and 8 may be half leads at vendor's option. Lead thicjkness is measured at seating plane or below. Lead spacing tolerance is non-cumulative. Exact body and lead configuration at vendor's option within limits shown.
2470 BUS DRIVER / RECEIVER
Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the design of its products. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

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