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vitesse semiconductor corporation datasheet VSC834 2.5gb/s 17x17 crosspoint switch with input signal activity (isa) monitoring g52247-0, rev 4.2 page 1 02/09/01 ? vitesse semiconductor corporation ? 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com features general description the VSC834 is a monolithic 17x17 asynchronous crosspoint switch designed to carry broadband data streams at up to 2.5gb/s. the non-blocking switch core is programmed through a parallel microprocessor inter- face that allows random access programming of each output port. a high degree of signal integrity is main- tained through the chip through fully differential signal paths. the crosspoint function is based on a multiplexer tree architecture. each data output is driven by a 17:1 multiplexer tree that can be programmed to one and only one of its 17 inputs, and each data input can be pro- grammed to multiple outputs. the signal path is unregistered, so no clock is required for the data inputs. the signal path is asynchronous, so there are no restrictions on the phase, frequency, or signal pattern at each input. each input channel has an activity monitor function that can be used to identify loss of activity (loa). an inter- rupt pin is provided to signal loa, after which an external controller can query the chip to determine the chan- nel(s) on which the fault occurred. each output driver is a fully differential switched current driver with on-die back-terminations for maxi- mum signal integrity. data inputs are terminated on die through 50 ? resistors connected to v term . the parallel interface uses ttl levels, and provides address, data, and control pins that are compatible with a microprocessor-style interface. the control port provides access to all chip functions, including loa, and programming. program buffering is provided to allow multiple program assignments to be queued and issued simultaneously via a single configure command. VSC834 block diagram ? 17 input by 17 output crosspoint switch 2.5gb/s nrz data bandwidth 42 gb/s aggregate bandwidth ttl compatible p interface differential pecl data inputs on-chip 50 ? input terminations 50 ? source terminated pecl output drivers single 3.3v supply 9w maximum power dissipation high performance 256 pin bga package a0 a16 p interface y0 y16 control logic
vitesse semiconductor corporation datasheet VSC834 2.5gb/s 17x17 crosspoint switch with input signal activity (isa) monitoring page 2 g52247-0, rev 4.2 02/09/01 ? vitesse semiconductor corporation 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com figure 1: detailed block diagram: functional description data paths all input data must be differential and biased to pecl levels. on-chip terminations are provided, with a nominal impedance of 50 ? . all input termination resistors are tied to v term . data outputs are provided through differential current switches with on-chip terminations that produce a pecl level output swing. the drive level of the output circuit is designed to produce standard pecl levels when terminated in 50 ? to 2.0v. other termination voltages are possible, such as to v cc or 1.3v, but the volt- age level of the output swing will be shifted from its nominal value. the common-mode voltage of the output swing can be adjusted using the vcom pin. the adjustment range is not calibrated, but typically allows for about + 200mv of adjustment in the output common-mode voltage. output channels can be powered off in pairs if fewer than 17 outputs are required. by connecting the vee pin associated with a given pair of outputs to v cc , the output pairs will pull to v cc and chip power will be reduced by roughly 200mw. 17x17 switch core a, an[16:0] y, yn[16:0] loa monitor program memory 17 control interface data[4:0], addr[5:0] ale, csb, wrb, rdb intb, monclk, config output drivers
vitesse semiconductor corporation datasheet VSC834 2.5gb/s 17x17 crosspoint switch with input signal activity (isa) monitoring g52247-0, rev 4.2 page 3 02/09/01 ? vitesse semiconductor corporation 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com programming interface the switch core is programmed through a parallel interface circuit that allows random reads or writes to the program memory array. the program memory array is buffered to allow multiple programming instructions to be loaded simultaneously with the config pin. parallel programing can be clocked at up to a 50mhz rate. the program data is composed of two parts: output address and input address. the output address, denoted by addr[5:0], specifies which output channel is to be programmed. the input address, denoted by data[4:0], specifies which input port the switch slice should connect to. the format of the program data is simple binary, where the binary value maps directly to the switch slice position and/or input port number. for example: addr[5:0] (000100) / data[4:0] (00110) would direct output channel y4 to connect to input channel a6. the programming state may be verified (read back) by applying the address of the desired output and asserting rdb. the programming state is unknown at power-on. additional address space is provided for access to the monitor registers (see table 2). the microprocessor interface consists of the following signals. levels are ttl (see table 6). table 1: signal table loss of activity (loa) monitoring the loa function consists of an activity monitor on each input channel, connected directly to the pads. the state of a monitor (whether or not it has been toggled by an input transition) can be observed by applying the address (see table 2) of the monitor register corresponding to the signal of interest and asserting rdb. each monitor register is four bits in length, covering the state of four inputs or outputs. there is one extra one-bit monitor for each of the 17 th input and 17 th output. the state of each monitor is transferred to the register period- ically on the rising edge of monclk, whereupon the activity monitor is clered until more activity is detected. pin i/o description d[5:0] b bidirectional data bus to transfer data to/from internal program registers a[5:0] i address bus to select internal program registers for read-write operations ale i address latch enable: for use with multiplexed address/data buses. latches the address bus internally when low. csb i chip select (active low): assert this pin whenever the part is being read or programmed. wrb i write (active low): program data will be transferred to the first level internal registers on the rising edge of this signal (when csb is also low). rdb i read (active low): program data from the internal program or monitor registers will be read out on the data bus when this signal goes low (with csb also low). intb o interrupt (active low): this signal is asserted when an loa condition is found config i configure (active high): assert this signal to transfer queued program information from the first-level internal registers to the second-level registers, making the programming take effect. this signal may be tied high to leave the second-level registers transparent so all programming will take effect immediately. csb must be active (low) when config is asserted. config may be tied to a high- order bit of the address bus monclk i monitor states are transferred to monitor registers on the rising edge of this signal. monclk is not expected to exceed 3mhz.
vitesse semiconductor corporation datasheet VSC834 2.5gb/s 17x17 crosspoint switch with input signal activity (isa) monitoring page 4 g52247-0, rev 4.2 02/09/01 ? vitesse semiconductor corporation 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com if any change in a monitor state occurs after sampling by monclk, an interrupt will be signalled by asserting intb, and the user must identify the offending channel by reading the monitor states. the interrupt will be cleared when the corresponding activity monitor is read, but the monitor state will not be changed. if multiple monitors have triggered the interrupt, it will persist until all the corresponding monitors have been read. the loa circuitry requires a minimum signal level of 30-150 mv peak-peak to recognize an input as active. this is required to distinguish noise on an unconnected signal (where both inputs float to the termination voltage) from activity on a live signal. a minimum of two transitions defines activity. the threshold signal level can be adjusted with the vhys pin, which can set the threshold from zero to the maximum allowed input swing. the vhys pin will self-bias to a nomial value that will be appropriate for most applications (30-150mv p-p input level). although uncalibrated for nominal level, gain and linearity, the vhys pin can be externally set to adjust the threshold level over the entire range of the input signal, from zero to the maximum level allowed at the input. table 2: memory map address access description 00h r/w output y0 ? s programmed input channel ( write and then assert config to program) 01h r/w output y1 ? s programmed input channel ... ... ... 10h r/w output y16 ? s programmed input channel 11h r/w internal output y17 ? s programmed input channel ... ... ... 20h r/w internal output y32 ? s programmed input channel 21h r/o rx activity monitor for inputs a0, a1,a2,a3 ( logic ? 1 ? =no activity) 22h r/o rx activity monitor for inputs a4, a5,a6,a7 23h r/o rx activity monitor for inputs a8, a9,a10,a11 24h r/o rx activity monitor for inputs a12, a13,a14,a15 25h r/o rx activity monitor for input a16
vitesse semiconductor corporation datasheet VSC834 2.5gb/s 17x17 crosspoint switch with input signal activity (isa) monitoring g52247-0, rev 4.2 page 5 02/09/01 ? vitesse semiconductor corporation 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com ac characteristics table 3: data path note: unless otherwise stated, all specifications are guaranteed but not tested. note 1: skew between any two input channels to a given output. note 2: skew between any two output channels from the same input channel. note 3: required for high-speed output rise/fall spec at f rate =2.5 gbits/s. for lower rate signals, use 0.375/f rate note 4: broadband jitter added to a jitter-free signal; jitter is primarily in the form of isi for random data figure 2: interrupt timing (change in monitor state registers) figure 3: interrupt timing (no change in monitor state registers) parameter description min typ max units f rate data rate - - 2.5 gb/s t iskw input channel delay skew (1) - 300 - ps t oskw output channel delay skew (2) - 300 - ps t r , t f high-speed input rise/fall times, 20% to 80% (3) - - 150 ps t r , t f high-speed output rise/fall times, 20% to 80% - - 150 ps t jp output data eye jitter, peak-peak, 2 23 prbs (4) - - 100 ps monclk monitor state monitor state reg intb csb rdb addr[5:0] data[4:0] t srdb t hrdb t tsdata monclk monitor state monitor state reg intb
vitesse semiconductor corporation datasheet VSC834 2.5gb/s 17x17 crosspoint switch with input signal activity (isa) monitoring page 6 g52247-0, rev 4.2 02/09/01 ? vitesse semiconductor corporation 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com figure 4: program timing table 4: programing port interface timing note 1: measured from falling edge. note 2: measured from rising edge. parameter description min max units t config switch configuration delay - 6 ns t pdaddr data read propagation delay from addr - 30 ns t pdrdb data read propagation delay from rdb (1) - 7 ns t pdint interrupt propagation delay from monclk (2) - 50 ns t pdstate monclk to internal state register change delay (2) - 6 ns t srdb addr to rdb setup time 5 - ns t hrdb rdb to addr hold time 3 - ns t swrb wrb setup time (for either addr or data) 5 - ns t hwrb wrb hold time (for either addr or data) 3 - ns t sconfig wrb to config setup time 1 - ns t scsb csb setup time (to either wrb or rdb) 0 - ns t pwconfig config pulse width (high) 10 - ns t pwwrb wrb pulse width (low and high) 10 - ns t pwrdb rdb pulse width (low and high) 10 - ns t tsdata data tri-state delay (from either rdb or csb) (2) - 10 ns t sale ale setup time (for multiplexed addr/data bus) 5 - ns addr[5:0] data[4:0] csb wrb rdb config t scsb t swrb t hwrb t sconfig
vitesse semiconductor corporation datasheet VSC834 2.5gb/s 17x17 crosspoint switch with input signal activity (isa) monitoring g52247-0, rev 4.2 page 7 02/09/01 ? vitesse semiconductor corporation 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com dc characteristics (all characteristics are over the specified operating conditions) table 5: power note: i cc specified with outputs terminated with 50 ? to +2.0v and chip v term =+2.0v. table 6: control port input levels table 7: data input levels (differential pecl) table 8: data output levels (differential pecl) note: (1) nominal pecl mode, v cc =v ccp =3.3v, v ee =0, terminated 50 ? to +2.0v. parameter description min typ max units conditions i cc v cc supply current 2600 ma p t total chip power (v cc = 3.45v and +85 o c case) 9w i term-v v term supply current with v term =v cc -1.3v ~0 ma i term-e v term supply current with v term =v cc -2.0v -600 ma parameter description min typ max units conditions v vcom vcom bias voltage (l and r) 2.0 v v cc =3.3v v vhys vhys bias voltage 1.65 v v cc =3.3v v ih input high voltage (ttl) 2.0 ? 3.5 v ? v il input low voltage (ttl) 0 ? 0.8 v ? i ih input high current (ttl) ?? 500 av in = 2.4v i il input low current (ttl) ?? -500 av in = 0.5v i oz tristate output current (ttl) -100 ? 100 av out = 0.4v-2.4v parameter description min typ max units conditions v id input differential voltage 200 ? 1000 mv ? v icm input common-mode voltage 1.8 ? 2.2 v v cc =3.3v parameter description min typ max units conditions v od output differential voltage 600 ? 1000 mv note 1 v ocm output common-mode voltage 1.8 ? 2.2 v note 1
vitesse semiconductor corporation datasheet VSC834 2.5gb/s 17x17 crosspoint switch with input signal activity (isa) monitoring page 8 g52247-0, rev 4.2 02/09/01 ? vitesse semiconductor corporation 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com absolute maximum ratings power supply voltage ( v cc ) potential to gnd ............................................................................-0.5 v to +4.0 v ttl input voltage applied ..................................................................................................-0. 5 v to v cc +0.5 v ecl input voltage applied ..................................................................................................-0. 5 v to v cc +0.5 v output current ( i out ) .............................................................................................................................. ..... 50 ma input current ( i in ) ............................................................................................................................... ....... 50 ma v term current ( i term ) ............................................................................................................................ 800 ma case temperature under bias ( t c ) ............................................................................................. -55 o c to + 125 o c storage temperature ( t stg ) ....................................................................................................... -65 o c to + 150 o c note: caution: stresses listed under ?absolute maximum ratings? may be applied to devices one at a time without causing per- manent damage. functionality at or exceeding the values listed is not implied. exposure to these values for extended peri- ods may affect device reliability. operating conditions supply voltage ( v ee ) .............................................................................................................................. ........... 0 v supply voltage ( v cc ) .............................................................................................................................+ 3.3v 5% supply voltage ( v ccp ) ...........................................................................................................................+3. 3v 5% termination voltage ( v term )..................................................................................................................v cc -1.3v case temperature operating range ( t ).............................................................................................. 0 o c to 85 o c junction temperature operating range ( t j ) .................................................................................... 0 o c to 110 o c esd ratings proper esd procedures should be used when handling this product. the VSC834 is rated to the following esd voltages based on the human body model: 1. all pins are rated at or above 1000v.
vitesse semiconductor corporation datasheet VSC834 2.5gb/s 17x17 crosspoint switch with input signal activity (isa) monitoring g52247-0, rev 4.2 page 9 02/09/01 ? vitesse semiconductor corporation 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com i/o equivalent circuits 50 ? pad pecl input equivalent circuit 2k ? 1.3k ? v ee pad v com (l or r) input equivalent circuit (on-die bias network) (on-die bias network) v cc v cc v cc v term v cc v cc v cc v cc 5k ? 5k ? 25k ? v ee pad v hys (c or l) input equivalent circuit v cc v cc 50 ? 15 ? 50 ? i sig pad pecl output equivalent circuit pad i sig
vitesse semiconductor corporation datasheet VSC834 2.5gb/s 17x17 crosspoint switch with input signal activity (isa) monitoring page 10 g52247-0, rev 4.2 02/09/01 ? vitesse semiconductor corporation 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com package pin descriptions the VSC834 is packaged in a 27x27mm 256 pin ball grid array package. the 256 bga package is ther- mally enhanced and carries the high-speed signals over controlled impedance lines from the solder ball to the circuit die. the following sections describe the pinout and mechanical details of the VSC834. figure 5: functional pinout floorplan i/p loa and termination control logic control logic 17:1 switch slice pair 17:1 switch slice pair 17:1 switch slice pair 17:1 switch slice pair 17:1 switch slice pair 17:1 switch slice pair i/p loa and termination y0 y2 y1 y3 y15 a1 a3 a5 a0 a2 a4 a16 a15 programming interface programming interface y16
vitesse semiconductor corporation datasheet VSC834 2.5gb/s 17x17 crosspoint switch with input signal activity (isa) monitoring g52247-0, rev 4.2 page 11 02/09/01 ? vitesse semiconductor corporation 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com figure 6: pinout diagram vcc vee vterm y0 y2 y4 y8 y10 y14 ale 1 a1 a3 a7 intb d2 adr0 adr2 adr1 adr3 adr4 adr5 d1 d0 d3 d4 d5 wrb csb config rdb y15 vcomr vhys a16 y6 y12 y16 a5 a9 a13 a11 a15 y13 y11 y9 y7 y5 y3 y1 a12 a14 a10 a6 a8 a4 a2 a0 vcoml 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 a b c d e f g h j k l m n p r t u v w y ball grid index bottom view monclk
vitesse semiconductor corporation datasheet VSC834 2.5gb/s 17x17 crosspoint switch with input signal activity (isa) monitoring page 12 g52247-0, rev 4.2 02/09/01 ? vitesse semiconductor corporation 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com table 9: pin identification signal name pin function level high speed data inputs a0, na0 a15, a14 data input pecl a1, na1 y15, y14 data input pecl a2, na2 d14, c14 data input pecl a3, na3 u14, v14 data input pecl a4, na4 c13, d13 data input pecl a5, na5 v13, u13 data input pecl a6, na6 a13, a12 data input pecl a7, na7 y13, y12 data input pecl a8, na8 d12, c12 data input pecl a9, na9 u12, v12 data input pecl a10, na10 c11, d11 data input pecl a11, na11 v11, u11 data input pecl a12, na12 a11, a10 data input pecl a13, na13 y11, y10 data input pecl a14, na14 d10, c10 data input pecl a15, na15 u10, v10 data input pecl a16, na16 c9, d9 data input pecl high speed data outputs y0, yn0 g18, g17 data output pecl y1, yn1 g1, h1 data output pecl y2, yn2 g20, h20 data output pecl y3, yn3 h4, h3 data output pecl y4, yn4 h17, h18 data output pecl y5, yn5 j3, j4 data output pecl y6, yn6 j18, j17 data output pecl y7, yn7 j1, k1 data output pecl y8, yn8 l20, m20 data output pecl y9, yn9 m4, m3 data output pecl y10, yn10 m17, m18 data output pecl y11, yn11 n3, n4 data output pecl y12, yn12 n18, n17 data output pecl y13, yn13 n1, p1 data output pecl y14, yn14 n20, p20 data output pecl y15, yn15 p4, p3 data output pecl
vitesse semiconductor corporation datasheet VSC834 2.5gb/s 17x17 crosspoint switch with input signal activity (isa) monitoring g52247-0, rev 4.2 page 13 02/09/01 ? vitesse semiconductor corporation 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com y16, yn16 p17, p18 data output pecl programming port adr0 b8 program data address ttl adr1 d8 program data address ttl adr2 c8 program data address ttl adr3 b7 program data address ttl adr4 c7 program data address ttl adr5 d7 program data address ttl d0 v7 program data ttl d1 v8 program data ttl d2 u8 program data ttl d3 w8 program data ttl d4 y8 program data ttl d5 y9 program data ttl ale a7 address latch enable (active high) ttl intb u7 interrupt (active low) ttl rdb w7 read enable (active low) ttl wrb y7 write enable (active low) ttl config w6 configuration strobe (active high) ttl csb y6 chip select (active low) ttl monclk a6 loss of activity monitor clock (active high) ttl power supplies vcc a1, a2, a3, a4, a5, a16, a17, a18, a19, a20, b1, b2, b3, b4, b5, b15, b16, b17, b18, b19, b20, c1, c2, c3, c4, c5, c6, c16, c17, c18, c19, c20, d1, d2, d3, d4, d5, d16, d17, d18, d19, d20, e1, e2, e3, e4, e17, e18, e19, e20, f1, f2, f3, f4, f19, f20, g3, g4, g19, h2, j20, k2, k3, k4, k17, k18, k19, k20, l1, l2, l3, l4, l17, l18, l19, m1, p2, r1, r2, r4, r17, r18, r20, t1, t2, t3, t4, t17, t18, t19, t20, u1, u2, u3, u4, u16, u17, u18, u19, u20, v1, v2, v3, v4, v16, v17, v18, v19, v20, w1, w2, w3, w4, w5, w16, w17, w18, w19, w20, y1, y2, y3, y4, y5, y16, y17, y18, y19, y20 power +3.3v table 9: pin identification signal name pin function level
vitesse semiconductor corporation datasheet VSC834 2.5gb/s 17x17 crosspoint switch with input signal activity (isa) monitoring page 14 g52247-0, rev 4.2 02/09/01 ? vitesse semiconductor corporation 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com vee a8, a9, b6, b10, b11, b13, b14, c15, d6, d15, f18, m19, r3, u5, u6, u9, v9, v15, w10, w11, w13, w14, w15 power gnd vee h19 power for output channels 0, 2 gnd vee g2 power for output channels 1, 3 gnd vee j19 power for output channels 4, 6 gnd vee j2 power for output channels 5, 7 gnd vee n19 power for output channels 8, 10 gnd vee m2 power for output channels 9, 11 gnd vee p19 power for output channels 12, 14 gnd vee n2 power for output channels 13, 15 gnd vee r19 power for output channel 16 gnd vterm b9, b12, f17, w9, w12 termination power +2.0v miscellaneous vcoml u15 slicing level for y0 - yn16 (even) analog vcomr v5 slicing level for y1 - yn15 (odd) analog vhys v6 loss of activity hysterisis threshold analog table 9: pin identification signal name pin function level
vitesse semiconductor corporation datasheet VSC834 2.5gb/s 17x17 crosspoint switch with input signal activity (isa) monitoring g52247-0, rev 4.2 page 15 02/09/01 ? vitesse semiconductor corporation 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com package information 27mm 256 bga package drawing dimensional references ref. min. nom. max. a a1 d d1 e e1 m b c aaa e 1.95 26.80 27.00 27.20 24.13 (bsc.) 20 0.85 1.25 0.25 1.27 typ. n 256 ccc 0.25 1.80 1.65 0.75 1.15 0.65 1.05 0.60 0.65 0.70 26.80 27.00 27.20 24.13 (bsc.) 0.15 p g 0.40 f 0.50 notes: 1. all dimensions are in millimeters. 2. "e" represents the basic solder ball grid pitch. 3. "m" represents the basic solder ball matrix size, and symbol "n" is the maximum allowable number of 4. "b" is measured at the maximum solder ball diameter parallel to primary datum -c- . dimension "aaa" is measured parallel to primary datum -c- . 6. primary datum -c- and seating plane are defined by the spherical crowns of the solder balls. 5. balls after depopulating. 9. substrate material base is copper. 7. package surface shall be black oxide. 8. cavity depth various with die thickness 11. 45 deg 0.5 mm chamfer corner and white dot for pin 1 identification. 10. bilateral tolenance zone is applied to each side of package body 12. dimension f is the max. encap. height 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 a b c d e f g h j k l m n p r t u v w y detail b bottom view d1 e1 10 -a- 0.10 -b- top view 11 d e (4 plcs) corner 45 degree 0.5mm chamfer c a1 aaa c -c- 5 6 a p ccc // c f 4 detail b b g g e e 0.10 s c 0.30 s c a s b s
vitesse semiconductor corporation datasheet VSC834 2.5gb/s 17x17 crosspoint switch with input signal activity (isa) monitoring page 16 g52247-0, rev 4.2 02/09/01 ? vitesse semiconductor corporation 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com ordering information the order number for this product is formed by a combination of the device number, and package type. notice vitesse semiconductor corporation ( ? vitesse ? ) provides this document for informational purposes only. all information in this document, includ- ing descriptions of features, functions, performance, technical specifications and availability, is subject to change without n otice at any time. noth- ing contained in this document shall be construed as extending any warranty or promise, express or implied, that any vitesse pr oduct will be available as described or will be suitable for or will accomplish any particular task. vitesse products are not intended for use in life support appliances, devices or systems. use of a vitesse product in such appl ications without writ- ten consent is prohibited. VSC834 ub device type 2.5ghz 17x17 crosspoint switch with package style ub: 256-pin bga package input signal activity (isa) monitoring

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