PT8300_10 Datasheet, PDF (4/19 Pages) Princeton Technology Corp – 16-Bit I/O Expander IC

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16-Bit I/O Expander IC
PT8300
FUNCTION DESCRIPTION
PT8300 is an I/O Expander IC which independently generates a 16-bit serial input-to-parallel output
shift register and a parallel input-to-serial output shift register for the purpose of reading the serial input
data that is generated during the parallel to serial data output conversion.
When the /RESET Pin is connected to VSS, the outputs of pins -- P0 to P7 are 0. If the PULLUP pin is
connected to VSS or open, the outputs of pins -- P8 to P15 are floating. If the PULLUP pin is connected
to VDD, the P8 to P15 pins are 1.
NO USED PINS
If any of the Input, Output or I/O (P8 to P15) pins are not used, then the following conditions listed in the
table must be carefully followed.
When an output pin is not used, it must keep OPEN. The unused input pin must only be set to either
HIGH or LOW. It should be noted that when an input pin is not used, it cannot be OPEN.
When the I/O Pins -- P8 to P15 -- are not used, certain conditions must be followed. If any of these pins,
P8 to P15 are connected to VSS, the PULLUP Pin must also be connected to VSS. If any of these pins
-- P8 to P15 -- are connected to VDD, then the Internal Shift Register 1 (Q8 to Q15) must be set to 1. If
these pins -- P8 to P15 -- are not connected to either VSS or VDD, then any one of the following
conditions must be followed:
1) PULLUP pin must be connected to VDD and the Shift Register 1 (Q8 to Q15) must be set to 1, or
2) PULLUP pin must be connected to VSS and the Shift Register 1 (Q8 to Q15) must be set to 0.
It must be noted that when P8 to P15 are not in used, they must be set to HIGH or LOW.
Type of Pin Not Used
Output pin
Input pin
I/O pin (P8 to P15)
Condition
The unused output pin must be kept OPEN or not connected
The unused input pin must either be set to HIGH or LOW.
It cannot be kept OPEN.
Connected to VSS
PULLUP pin must be connected to VSS
Connected to VDD Shift register 1 (Q1 to Q15) is set to 1
Any one of the conditions must be followed:
1. PULLUP pin is connected to VDD and shift
register 1 (Q1 to Q15) is set to 1.
No Connection
2. PULLUP pin is connected to VSS, and shift
register 1 (Q8 to Q15) is set to 0.
3. When P8 to P15 are not in used, they must
either be set to HIGH or LOW.
PT8300 V1.8
-4-
February, 2006