2470
BUS DRIVER / RECEIVER
DISCONTINUED PRODUCT
— FOR REFERENCE ONL
Y
ABSOLUTE MAXIMUM RATINGS
at T
A
= 25°C
Bus Supply Voltage Range,
(V
BAT
) ......................... -13.5 V to 27 V
Logic Supply Voltage Range,
(V
CC
)............................ -0.3 V to 9.0 V
Input Voltage Range,
(V
BUS
) ........................... -3.0 V to 24 V
Operating Temperature Range,
T
A
............................... -40°C to +85°C
Junction Temperature Range,
T
J
................................ -40°C to 150°C
Storage Temperature Range,
T
S
................................ -65°C to 150°C
BUS DRIVER / RECEIVER
FUNCTIONAL BLOCK DIAGRAM
Rd
Rd
Td
GND
VCC VS
REXT
BUS
6
5
4
7
2
1
3
8
CURRENT
LIMIT
22 kW
12 W
25 W
28 V
Data Sheet
27463
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.
Dwg. FP-039
FEATURES AND BENEFITS
n Over-Voltage Protection
n Diode Isolation from both Ground and Supply
n Reverse-Battery Protection
n Low Supply Current
n High Noise Immunity
n Output Current Limiting
n Low Standby Current—24 mA Max.
n Open-Ground Protection
n Under-Voltage Lockout
2470
ULQ2470M
1
2
3
45
6
7
8Rd
Rd
Td
GND
VCC
VS
REXT
BUS
Dwg. PP-061
Note that the ULQ2470M (DIP) and the ULQ2470L
(SOIC) are electrically identical and share a
common terminal number assignment.