CS5535 datasheet(28/555 Pages) NSC

28 / 555 page

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Signal Definitions (Continued)

2.1.1

Buffer Types

Table 2-2 "Ball Assignments: Sorted by Ball Number" on

page 21 includes a column labeled “Buffer Type”. The

details of each buffer type listed in this column are given in

Table 2-4. The column headings in Table 2-4 are identified

as follows:

TS: Indicates whether the buffer may be put into the TRI-

STATE mode. Note some pins that have buffer types that

allow TRI-STATE may never actually enter the TRI-STATE

mode in practice, since they may be inputs or provide other

signals that are always driven. To determine if a particular

signal can be put in the TRI-STATE mode, consult the indi-

vidual signal descriptions in Section 2.2 "Signal Descrip-

tions" on page 31.

OD: Indicates if the buffer is open-drain, or not. Open-drain

outputs may be wire ORed together and require a discrete

pull-up resistor to operate properly.

5VT: Indicates if the buffer is 5-volt tolerant, or not. If it is 5-

volt tolerant, then 5 volt TTL signals may be safely applied

to this pin.

Backdrive Protected: Indicates that the buffer may have

active signals applied even when the CS5535 itself is pow-

ered down.

PU/PD: Indicates if an internal, programmable pull-up or

pull-down resistor may be present.

Current High/Low (mA): This column gives the current

source/sink capacities when the voltage at the pin is high,

and low. The high and low values are separated by a “/”

and values given are in milli-amps (mA).

Rise/Fall @ Load: This column indicates the rise and fall

times for the different buffer types at the load capacitance

indicated. These measurements are given in two ways:

rise/fall time between the 20%-80% voltage levels, or, the

rate of change the buffer is capable of, in volts-per-nano-

second (V/ns). See Section 6.3 "AC Characteristics" on

page 530 for details.

Note the presence of several “wire” type buffers in this

table. Signals identified as one of the wire-types are not

driven by a buffer, hence no rise/fall time or other measure-

ments are given; these are marked “NA” in Table 2-4. The

wire-type connection indicates a direct connection to inter-

nal circuits such as power, ground, and analog signals.

Table 2-4. Buffer Type Characteristics

Name

5VT

Backdrive

Protected

PU/PD

Current

High/Low

(mA)

Rise/Fall @ Load

24/24

3 ns @ 50 pF

24/24

5 ns @ 50 pF

24/24

7 ns @ 50 pF

PCI

0.5/1.5

1-4 V/ns @ 10 pF

IDE

16/16

1.25 V/ns @ 40 pF

SMB

Rise: 1 µs @ 400 pF

Fall: 300 ns @ 400 pF

Bare_Wire

Bare_Wire_BP

AVDD_USB

AVSS_USB

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