ds4550et-r Maxim Integrated Products, Inc., ds4550et-r Datasheet - Page 6

• Manufacturer Part Number: ds4550et-r
• Description: Ds4550 I?c And Jtag Nonvolatile 9-bit I/o Expander Plus Memory
• Manufacturer: Maxim Integrated Products, Inc.

I
Expander Plus Memory
6
2
PIN
10
11
12
13
14
15
16
17
18
19
20
C and JTAG Nonvolatile 9-Bit I/O
1
2
3
4
5
6
7
8
9
_____________________________________________________________________
NAME
I/O_0
I/O_1
I/O_2
I/O_3
I/O_4
I/O_5
I/O_6
I/O_7
I/O_8
GND
TCK
TMS
SDA
SCL
TDO
V
TDI
A0
A1
A2
CC
Input/Output 0. Bidirectional I/O pin.
Input/Output 1. Bidirectional I/O pin.
Input/Output 2. Bidirectional I/O pin.
Input/Output 3. Bidirectional I/O pin.
Input/Output 4. Bidirectional I/O pin.
I
I
JTAG Test Clock. This signal is used to shift data into TDI on the rising edge and out of TDO on the
falling edge.
JTAG Test Mode Select. This pin is sampled on the rising edge of TCK and used to place the TAP
into the various defined JTAG states. This pin has an internal pullup resistor.
Power Supply Voltage
I
I
JTAG Test Data Input. Test instructions and data are clocked into this pin on the rising edge of TCK.
This pin has an internal pullup resistor.
JTAG Test Data Output. Test instructions and data are clocked out of this pin on the falling edge of
TCK. If not used, this pin should be left open circuit.
I
Input/Output 5. Bidirectional I/O pin.
Input/Output 6. Bidirectional I/O pin.
Input/Output 7. Bidirectional I/O pin.
Input/Output 8. Bidirectional I/O pin.
Ground
2
2
2
2
2
C Address Input. Inputs A0, A1, and A2 determine the I
C Address Input. Inputs A0, A1, and A2 determine the I
C Address Input. Inputs A0, A1, and A2 determine the I
C Serial Data Open-Drain Input/Output
C Serial Clock Input
FUNCTION
2
2
2
C slave address of the device.
C slave address of the device.
C slave address of the device.
Pin Description