MAX395EWG+ Maxim Integrated Products, MAX395EWG+ Datasheet - Page 15

• Manufacturer Part Number: MAX395EWG+
• Description: IC SWITCH OCTAL SPST 24SOIC
• Manufacturer: Maxim Integrated Products

Specifications of MAX395EWG+

• Function: Switch
• Circuit: 8 x SPST - NO
• On-state Resistance: 100 Ohm
• Voltage Supply Source: Single, Dual Supply
• Voltage - Supply, Single/dual (±): 2.7 V ~ 8 V, ± 2.7 V ~ 16 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (0.300", 7.50mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

age current flows to the supply terminals, not to the
other switch terminal. This is why both sides of a given
switch can show leakage currents of either the same or
opposite polarity.
There is no connection between the analog signal
paths and GND.
V+ and GND power the internal logic and logic-level
translators, and set both the input and output logic lim-
its. The logic-level translators convert the logic levels to
switched V+ and V- signals to drive the analog signal
gates. This drive signal is the only connection between
the logic supplies (and signals) and the analog sup-
plies. V+, and V- have ESD-protection diodes to GND.
The logic-level inputs and output have ESD protection
to V+ and to GND.
The logic-level thresholds are CMOS and TTL compati-
ble when V+ is +5V. As V+ is raised, the threshold
increases slightly. So when V+ reaches +12V, the
threshold is about 3.1V; slightly above the TTL guaran-
teed high-level minimum of 2.8V, but still compatible
with CMOS outputs.
The MAX395 operates with bipolar supplies between
±3.0V and ±8V. The V+ and V- supplies need not be
symmetrical, but their sum cannot exceed the absolute
maximum rating of 17V. Do not connect the MAX395
V+ to +3V and connect the logic-level pins to TTL
logic-level signals. This exceeds the absolute maxi-
mum ratings and can damage the part and/or exter-
nal circuits.
Table 2. SPDT Switch Programming
RESET
0
1
1
1
1
1
1
1
1
D7
X
0
1
X
X
X
X
X
X
______________________________________________________________________________________
D6
X
X
X
X
X
X
X
1
0
D5
X
X
X
X
X
X
X
0
1
Serially Controlled, Low-Voltage,
Bipolar Supplies
D4
X
X
X
X
X
X
X
1
0
DATA BITS
D3
X
X
X
X
X
0
1
X
X
8-Channel SPST Switch
The MAX395 operates from a single supply between
+3V and +16V when V- is connected to GND. All of the
bipolar precautions must be observed.
In 50Ω systems, signal response is reasonably flat up
to 50MHz (see Typical Operating Characteristics) .
Above 20MHz, the on-response has several minor
peaks that are highly layout dependent. The problem is
not turning the switch on, but turning it off. The off-state
switch acts like a capacitor and passes higher frequen-
cies with less attenuation. At 10MHz, off isolation is
about -45dB in 50Ω systems, becoming worse (approx-
imately 20dB per decade) as frequency increases.
Higher circuit impedances also make off isolation
worse. Adjacent channel attenuation is about 3dB
above that of a bare IC socket, and is due entirely to
capacitive coupling.
D2
X
X
X
X
X
1
0
X
X
D1
X
X
X
X
X
X
X
0
1
High-Frequency Performance
D0
X
X
X
X
X
X
X
1
0
All switches open, D7–D0 = 0
Switch 7 off and 6 on
Switch 6 off and 7 on
Switch 5 off and 4 on
Switch 4 off and 5 on
Switch 3 off and 2 on
Switch 2 off and 3 on
Switch 1 off and 0 on
Switch 0 off and 1 on
FUNCTION
Single Supply
15