MAX9595CTM+T Maxim Integrated Products, MAX9595CTM+T Datasheet - Page 16

• Manufacturer Part Number: MAX9595CTM+T
• Description: IC AUDIO/VIDEO SWIT DUAL 48TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX9595CTM+T

• Function: Audio/Video Switch
• Circuit: 2 x SCART
• Voltage Supply Source: Single, Dual Supply
• Voltage - Supply, Single/dual (±): 4.75 V ~ 5.25 V, ±11.4 V ~ 12.6 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 48-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX9595 is compatible with existing I
SCL and SDA are high-impedance inputs. SDA has an
open drain that pulls the bus line to a logic-low during
the 9th clock pulse. Figure 6 shows a typical I
face application. The communication protocol supports
the standard I
address is compatible with the 7-bit I
protocol only; 10-bit format is not supported.
The I
defined as V
include Schmitt-trigger buffers to accept low-transition
interfaces. The digital inputs are compatible with 3V
CMOS logic levels.
Audio/Video Switch for Dual SCART Connector
Write Mode
Read Mode
S = Start Condition, A = Acknowledge, NA = Not Acknowledge,
Sr = Repeat Start Condition, P = Stop Condition
Figure 6. Typical I
16
S
S
address)
Address
______________________________________________________________________________________
(Write
2
Slave
(Write address)
Slave Address
C-compatible, 2-wire interface has logic levels
SDA
Digital Inputs and Interface Logic
µC
IL
A
2
SCL
= 0.8V and V
C 8-bit communications. The MAX9595
2
Register
Address
C Interface Application
Data Format of the I
A
A Sr
Register
Address
IH
SCL
SDA
SCL
SDA
SCL
SDA
address)
Address
= 2.0V. All of the inputs
(Read
Slave
MAX9595
DEVICE 2
DEVICE 1
I
2
C Compatibility
A
V
V
V
2
A Data NA P
VID
DD
DD
C addressing
Data
2
2
C Interface
C systems.
2
C inter-
A
P
Connect DEV_ADDR to ground to set the MAX9595
write and read address as shown in Table 2.
Program the SCART video and audio switches by writ-
ing to registers 00h through 0Dh. Registers 00h through
0Eh can also be read, allowing read-back of data after
programming and facilitating system debugging. The
status register is read-only and can be read from
address 0Eh. See Tables 3–12 for register program-
ming information.
INTERRUPT_OUT is an open-drain output that
becomes high impedance when a change in any of the
slow-switch signals occurs. Clear INTERRUPT_OUT by
setting bit 4 of register 01h low.
The MAX9595 features high-ESD protection on all
SCART inputs and outputs, and requires no external
transient-voltage suppressor (TVS) devices to protect
against floating chassis discharge. Some set-top boxes
have a floating chassis problem in which the chassis is
not connected to earth ground. As a result, the chassis
can charge up to 500V. When a SCART cable is con-
nected to the SCART connector, the charged chassis
can discharge through a signal pin. The equivalent cir-
cuit is a 2200pF capacitor charged to 311V connected
through less than 0.1Ω to a signal pin. The MAX9595 is
soldered on the PC board when it experiences such a
discharge. Therefore, the current spike flows through
the ESD protection diodes and is absorbed by the sup-
ply bypass capacitors, which have high capacitance
and low ESR.
To better protect the MAX9595 against excess voltages
during the cable discharge condition, place an addi-
tional 75Ω resistor in series with all inputs and outputs
to the SCART connector. For harsh environments where
±15kV protection is needed, the MAX4385E and
MAX4386E single and quad high-speed op amps fea-
ture the industry’s first integrated ±15kV ESD protection
on video inputs and outputs.
Table 2. Slave Address Programming
ADDRESS PIN
GNDVID
STATE
V
VID
Data Register Writing and Reading
Applications Information
Hot-Plug of SCART Connectors
ADDRESS
WRITE
INTERRUPT_OUT Signal
96h
94h
READ ADDRESS
Programming
97h
95h