ST70235A View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

ST70235A

ASCOT™ DMT TRANSCEIVER

STMicroelectronics 

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ST70235A

PIN FUNCTIONS (continued)

Pin

Name

Type

PAD Type

HCMOS7

BS

Function

121 PDOWN

122 VDD 3.3

123 AFRXD_0

124 AFRXD_1

125 AFRXD_2

126 AFRXD_3

127 VSS

128 CLWD

129 MCLK

130 CTRLDATA

131 VDD 3.3

132 COMP_VDD_1.8

133 COMP_ROUT

134 VSS

135 DISABLE_COMP

136 RESERVED

137 VDD 1.8

138 IDDq

139 AFTXD_0

140 AFTXD_1

141 VSS

142 AFTXD_2

143 AFTXD_3

144 VDD 3.3

O

BD4STARP

O Power down analog front end (Reset)

(VSS + 3.3V) Power Supply

I

TLCHT

I Receive data nibble

I

TLCHT

I Receive data nibble

I

TLCHT

I Receive data nibble

I

TLCHT

I Receive data nibble

0V Ground

I

TLCHT

I Start of word indication

I

TLCHT

C Master clock

O

BD4STARP

O Serial data Transmit channel

(VSS + 3.3V) Power Supply

COMP_1V60

Compensation Cell VDD 1.8V (see note 1)

O COMP_1V60 none Compensation Cell Resistor (see note 1)

COMP_1V60

0V Ground

I

TLCHTDQ

Disable Compensation Cell (see note 1)

Reserved

(VSS + 1.8V) Power Supply

I

TLCHT

none Test pin, active high

O

BD8STARP

O Transmit data nibble

O

BD8STARP

O Transmit data nibble

0V Ground

O

BD8STARP

O Transmit data nibble

O

BD8STARP

O Transmit data nibble

(VSS + 3.3V) Power Supply

Note: Compensation cell - The COMP_OUT pin must be connected at GND by a 100KΩ resistor on board.

Specifications of the resistor have to meet the following requirements:

± 5% allowed on the value, ±1% is preferred.

Advice is given to place the resistor so that there will be the shortest path between it and the pin.

Using the DISABLE_COMP signal is possible to disable the slew rate control of IOs, in this mode the IOs are however still functional,

but dynamic performances are affected.

An internal pull-down on DISABLE_COMP pin enables the slew rate control of IOs, an external pull-up resistor (connected at 3.3V)

must be inserted in order to disable the slew rate control.

Table 1 : I/O Driver Function

Driver

Function

BD4STARP

BD8STARP

TLCHTDQ

TLCHTUQ

TLCHT

TTL Three Volt capable Schmitt Trigger Bidirectional Pad Buffer, 4mA, with Test pins, with Active Slew

Rate Control

TTL Three Volt capable Schmitt Trigger Bidirectional Pad Buffer, 8mA, with Test pins, with Active Slew

Rate Control

TTL Three Volt capable Input Buffer with Active Pull-Down and Test pin

TTL Three Volt capable Input Buffer with Active Pull-Up and Test pin

TLL Three Volt capable Input Pad Buffer

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