AM6548 datasheet(115/299 Pages) TI1

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AM6548, AM6528, AM6546

AM6526, AM6527

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SPRSP08E – NOVEMBER 2017 – REVISED OCTOBER 2018

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Product Folder Links: AM6548 AM6528 AM6546 AM6526 AM6527

Terminal Configuration and Functions

4.5

Connections for Unused Pins

This section describes the Unused/Reserved balls connection requirements.

NOTE

All power balls must be supplied with the voltages specified in Section 5.4, Recommended

Operating Conditions, unless otherwise specified in Section 4.3, Signal Descriptions.

Table 4-76. Unused Balls Specific Connection Requirements

Balls

Connection Requirements

AD5, C22, AE4, AA3 K2, K3, V5, H2, H3, K5, J3, J1, J5, K4, J4, J2,

J6, F4, G6, G4, H5, F5, G5, G3, H4

Each of these balls must be connected to VSS through a separate

external pull resistor to ensure these balls are held to a valid logic

low level if unused

F17, W4, W5, E19, AA4, A21, AC7, AD6, AD7, AD8, F18, C20, A20,

AA1, AA2

Each of these balls must be connected to the corresponding power

supply through a separate external pull resistor to ensure these balls

are held to a valid logic high level if unused(1)

F21, T6, F23, D24

This ball must be left unconnected if unused.

(1) To determine which power supply is associated with any IO refer to Table 4-1, Pin Attributes.

NOTE

The following balls are reserved: AC23 (RSV4), B1 (RSV3), AA6 (RSV2), C12 (RSV5), F9

(RSV6), F10 (RSV7), AD10 (RSV8), AC13 (RSV9), B28 (RSV10), A27 (RSV11), D23

(RSV12), E23 (RSV13).

These balls must be left unconnected.

NOTE

The following balls are reserved: V4 (RSV1)

These balls must be connected to VSS through a separate external pull resistor to ensure

these balls are held to a valid logic low level.

NOTE

All other unused signal balls with a Pad Configuration Register can be left unconnected with

their multiplexing mode set to GPIO input and internal pulldown resistor enabled.

Unused balls are defined as those which only connect to a PCB solder pad. This is the only

use case where internal pull resistors are allowed as the only source/sink to hold a valid logic

level.

Any balls connected to a via, test point, or PCB trace are considered used and must not

depend on the internal pull resistor to hold a valid logic level.

Internal pull resistors are weak and may not source enough current to maintain a valid logic

level for some operating conditions. This may be the case when connected to components

with leakage to the opposite logic level, or when external noise sources couple to signal

traces attached to balls which are only pulled to a valid logic level by the internal resistor.

Therefore, external pull resistors may be required to hold a valid logic level on balls with

external connections.

If balls are allowed to float between valid logic levels, the input buffer may enter a high-

current state which could damage the IO cell.

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