Xilinx XC9500 Series

ðÒÉ×ÅÔ Michael!

21 Jan 05 22:38, Michael Serebrov -> All:

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VOH Output high voltage for 5 V operation IOH = -4.0 mA /VCC = Min - 2.4 V Output high voltage for 3.3 V operation IOH = -3.2 mA /VCC = Min - 2.4 V VOL Output low voltage for 5 V operation IOL = 24 mA /VCC = Min - 0.5 V Output low voltage for 3.3 V operation IOL = 10 mA /VCC = Min - 0.4 V

ðÏ ÐÅÓÓÉÍÉÓÔÉÞÎÙÍ ÐÒÏÇÎÏÚÁÍ 0.5*0.01*50=250mW × ÄÏÐÏÌÎÅÎÉÅ Ë ÏÓÎÏ×ÎÏÍÕ ÒÁÓÓÅÑÎÉÀ. ðÏ ÏÐÔÉÍÉÓÔÉÞÎÙÍ (for XC9500 CPLD) 12*0.01^2*50=60mw..

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in addition:

CMOS I/O Characteristics by PETER ALFKE u ( snipped-for-privacy@xilinx.com) xcell28

This article will give you an overview of our device I/O characteristics, to help you create better, more reliable designs. All Xilinx devices use CMOS technology,

which means there are two types of transistors: ÄN-channel transistors, turned on by a positive gate voltage. ÄP-channel transistors, turned on by a negative gate voltage.

For either transistor, the turn-on voltage must exceed the ~1-V threshold voltage. Figure 1 shows a complementary inverter, consisting of a p-channel pull-up transistor and an n-channel pull-down transistor with both gates driven in common. Outputs All Xilinx devices, except for the XC9500 family and the original XC4000 family, have complementary outputs. However, for XC4000E, XC4000EX, and Spartan families, you must specify this option explicitly. The default on these devices is _TTL output_ as described below.

Complementary outputs (See Figure 1.) are pulled _rail-to-rail,_ maximizing the output swing, especially desirable when driving other CMOS logic. With no DC load, the output voltage swings precisely between ground and Vcc with no voltage drop (the device output specifications of 0.4 and 3.86-V refer to particular dc loading conditions).

_TTL outputs_ (See Figure 2.) have a reduced voltage swing, which achieves faster performance, especially for the High-to-Low transition when measured at the usual 1 .5-V level. The term _TTL output_ is actually a misnomer, derived from the similarity with the _totem-pole_ structure of bipolar TTL outputs that use only npn transistors for pull-down and pull-up. Similarly, the _TTL output_ structure in CMOS uses only n-channel transistors output High voltage (Voh) by one threshold voltage, (1 to 1.5-V) below Vcc. At 3.3-V supply voltages (and lower), complementary _rail-torail_ or CMOS is the only available (and meaningful) output option.

The output impedance for our FPGAs is 15 to 30 Ohm in the Low state, and 30 to 50 Ohm in the High state. The output impedance for our /XC9500 CPLDs/ is t 10 o 12 Ohm in the Low state, and 70 to 120 Ohm in the High state The XC9500 and the original XC4000 devices have TTL-level outputs only.

On XC4000E, XC4000EX, and Spartan devices, TTL-output is the default, but can be changed to complementary output. If any data sheet specifies VOH as >3.5-V, it is a complementary output. If VOH is specified as 2.4-V, it is a TTL-level output.

Note that an output driving a long interconnect line or PC board trace can see reflections that drive the output well above Vcc and well below ground. Such reflections usually last for just a few nanoseconds (<10 ns) and are usually suppressed by the Continued on Figure 1. Complimentary Inverter or Buffer. Figure 2. Totem-Pole _TTL Output_ Buffer

Vitaly Polikarpov, vitvp[Üt]mail.ru

ðÒÉ×ÅÔ Vitaly!

22 Jan 05 22:24, Vitaly Polikarpov -> Michael Serebrov:

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Michael

ðÒÉ×ÅÔ Michael!

25 Jan 05 0:13, Michael Serebrov -> Vitaly Polikarpov:

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P=R*I^2 ?

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HÁ ×ÓÅ ×ÏÐÒÏÓÙ ÎÅ ÂÕÄÅÔ ÏÔ×ÅÔÁ(Ó)ðÉËÎÉË

All outputs provide 24 mA drive, ÏÓÔÁÌØÎÏÅ - ÎÁ ÓÏ×ÅÓÔÉ ÒÁÚÒÁÂÏÔÞÉËÁ.

Vitaly Polikarpov, vitvp[Üt]mail.ru

Wed Jan 26 2005 23:26, Vitaly Polikarpov wrote to Michael Serebrov:

VP> HÁ ×ÓÅ ×ÏÐÒÏÓÙ ÎÅ ÂÕÄÅÔ ÏÔ×ÅÔÁ(Ó)ðÉËÎÉË

VP> All outputs provide 24 mA drive, ÏÓÔÁÌØÎÏÅ - ÎÁ ÓÏ×ÅÓÔÉ ÒÁÚÒÁÂÏÔÞÉËÁ.

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Aleksei Pogorily 2:5020/1504

ðpÉ×ÅÔ ÔÅÂÅ, Michael! äÅÌÏ ÂÙÌÏ 21 ÑÎ×ÁpÑ 05, Michael Serebrov É All ÏÂÓÕÖÄÁÌÉ ÔÅÍÕ "Xilinx XC9500 Series".

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Hello, Alexander! You wrote to Michael Serebrov on Fri, 28 Jan 2005 02:21:48 +0300:

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AVL> ÄÅÌÁÊ ÔÅÐÌÏ×ÏÊ pÁÓÞÅÔ.

ìÕÞÛÅ ÐÏÓÐÒÏÛÁÔØ × ÓÁÐÐÏÒÔÅ ÐÒÏÉÚ×ÏÄÉÔÅÌÑ. õ ÁÌØÔÅÒÙ ÄÌÑ ËÁËÏÊ-ÔÏ ÓÅÒÉÉ (7000?) Ñ×ÎÏ ÏÇÏ×ÏÒÅÎÏ ÒÁÚÂÉÅÎÉÅ ÚÅÍÅÌØ É ÐÉÔÁÎÉÊ i/o × Ä×Å ÇÒÕÐÐÙ Ó ÒÁÚÄÅÌØÎÙÍÉ ÛÉÎÁÍÉ É ÏÇÒÁÎÉÞÅÎÉÅ ÎÁ ÔÏËÉ ÐÏ ÜÔÉÍ ÛÉÎÁÍ. äÌÑ ÄÒÕÇÏÊ ÓÅÒÉÉ ÔÁËÏÇÏ ÒÁÚÂÉÅÎÉÑ É ÏÇÒÁÎÉÞÅÎÉÑ ÎÅ ÏÇÏ×ÏÒÅÎÏ, ÎÏ ÐÏÓÌÅ Ä×ÕÈÎÅÄÅÌØÎÏÊ ÐÅÒÅÐÉÓËÉ Ó ÎÉÍÉ ÕÄÁÌÏÓØ ×ÙÑÓÎÉÔØ, ÞÔÏ ÍÎÅ ÜÔÉ ÍÓ ÎÅ ÐÏÄÈÏÄÑÔ - ÉÍÅÎÎÏ ÐÏ ÎÁÇÒÕÚÏÞÎÏÊ ÓÐÏÓÏÂÎÏÓÔÉ. ÷ÏÚÍÏÖÎÏ, Õ ÓÁÂÖÁ ×ӣ ÏÂÓÔÏÉÔ ÎÅ ÍÅÎÅÅ ÈÉÔÒÏ.

With best regards, Alexander Derazhne

ðpÉ×ÅÔ ÔÅÂÅ, Alexander! äÅÌÏ ÂÙÌÏ 28 ÑÎ×ÁpÑ 05, Alexander Derazhne É Alexander V. Lushnikov ÏÂÓÕÖÄÁÌÉ ÔÅÍÕ "Xilinx XC9500 Series".

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AVL>> ÄÅÌÁÊ ÔÅÐÌÏ×ÏÊ pÁÓÞÅÔ.

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õÄÁÞÉ! áÌÅËÓÁÎÄp ìÕÛÎÉËÏ×.