MAX4508CSE Maxim Integrated Products, MAX4508CSE Datasheet - Page 10

• Manufacturer Part Number: MAX4508CSE
• Description: Multiplexer Switch ICs
• Manufacturer: Maxim Integrated Products
• Type: Analog Multiplexerr

Specifications of MAX4508CSE

• Number Of Channels: 1 Channel
• On Resistance (max): 950 Ohms at 12 V
• Propagation Delay Time: 350 ns at +/- 15 V
• On Time (max): 500 ns at 12 V
• Off Time (max): 250 ns at 12 V
• Supply Voltage (max): 36 V
• Supply Voltage (min): 9 V
• Maximum Power Dissipation: 696 mW
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Package / Case: SOIC-16 Narrow
• Mounting Style: SMD/SMT
• Switch Current (typ): 0.37 mA at 15 V, - 0.2 mA at - 15 V
• Lead Free Status / Rohs Status: No

Fault-Protected, High-Voltage Single 8-to-1/
Dual 4-to-1 Multiplexers with Output Clamps
Figure 1. Functional Diagram
When the NO_ voltage goes beyond supply rails (fault
condition), the NO_ input becomes high impedance
regardless of the switch state or load resistance. When
power is removed, and the fault protection is still in
effect, the NO_ terminals are a virtual open circuit. The
fault can be up to ±40V, with V+ = V- = 0. If the switch
is on, the COM_ output current is furnished from the V+
or V- pin by “booster” FETs connected to each supply
pin. These FETs can source or sink up to 10mA.
The COM_ pins are not fault protected. If a voltage
source is connected to any COM_ pin, it should be lim-
ited to the supply voltages. Exceeding the supply volt-
age will cause high currents to flow through the ESD
protection diodes, damaging the device (see Absolute
Maximum Ratings).
Figure 1 shows the internal construction, with the ana-
log signal paths shown in bold. A single normally open
(NO) switch is shown. The analog switch is formed by
the parallel combination of N-channel FET N1 and P-
channel FET P1, which are driven on and off simultane-
ously, according to the input fault condition and the
logic level state.
10
______________________________________________________________________________________
GWD
NO_
V+
A-
V-
ESO CODE
NORMALLY OPEN SWITCH CONSTRUCTION
FAULT
FAULT
HIGH
LOW
ON
The maximum allowable input voltage for safe opera-
tion depends on whether supplies are on or off and the
load configuration at the COM output. If COM is re-
ferred to a voltage other than ground, but within the
supplies, V
plies provided the absolute value of ⎢ V
less than 40V. For example, if the load is referred to
+10V at COM_, then the NO_ voltage range can be
from +50V to -30V. As another example, if the load is
connected to -10V at COM_, the NO_ voltage range is
limited to -50V to +30V.
If the supplies are ±15V and COM is referenced to
ground through a load, the maximum NO_ voltage is
±25V. If the supplies are off and the COM output is ref-
erenced to ground, the maximum NO_ voltage is ±40V.
Two comparators continuously compare the voltage on
the NO_ pin with V+ and V- supply voltages. When the
signal on NO_ is between V+ and V-, the multiplexer
behaves normally, with FETs N1 and P1 turning on and
off in response to A_ signals (Figure 1). The parallel
NO_
N1
may range higher or lower than the sup-
P1
MAX4508
MAX4509
NO_ Input Voltage
Normal Operation
P2
N2
NO_
- V
COM_
COM_
⎢ is