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CS5535-UDC Datasheet(PDF) 28 Page - National Semiconductor (TI) |
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CS5535-UDC Datasheet(HTML) 28 Page - National Semiconductor (TI) |
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28 / 555 page  www.national.com 28 Revision 0.8 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 TS OD 5VT Backdrive Protected PU/PD Current High/Low (mA) Rise/Fall @ Load Q3 X X 24/24 3 ns @ 50 pF Q5 X X 24/24 5 ns @ 50 pF Q7 X X 24/24 7 ns @ 50 pF PCI X 0.5/1.5 1-4 V/ns @ 10 pF IDE X 16/16 1.25 V/ns @ 40 pF SMB X X X Rise: 1 µs @ 400 pF Fall: 300 ns @ 400 pF Bare_Wire NA NA NA NA NA Bare_Wire_BP NA NA X NA NA NA AVDD_USB NA NA NA NA NA AVSS_USB NA NA NA NA NA |
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