Product Description The pattern generator probes provide multichannel signals to simulate signals in a test environment. Following are descriptions of the probes discussed in this manual: P6470 TTL/CMOS The P6470 provides TTL or CMOS signals to the target system and contains 16 data outputs, 1 clock output, and 1 strobe output. The Vcc output driver is adjustable from 2.0 V to 5.5 V. Figure 14 on page 18 shows the P6470 input/output circuit. The P6470 probe comes standard with 75 Ω termination resistors packs. You can change the resistor packs to provide impedance matching for the target system. Refer to Removing the Probe Cover on page 46 and Changing the Series Termination Resistors on page 47. P6471 ECL The P6471 ECL pattern generator probe provides ECL signals to the target system and contains 16 data outputs, 1 clock output, and 1 strobe output. Figure 15 on page 19 shows the P6471 input/output circuit. P6472 PECL/LVPECL The P6472 provides PECL/LVPECL signals to the target system and contains 8 data outputs, 1 clock output, and 1 strobe output. You can select PECL or LVPECL by moving a jumper in the probe. See Configuring the P6472 for PECL or LVPECL on page 48. Figure 16 on page 20 shows the P6472 input/out- put circuit. P6473 LVDS The P6473 provides LVDS signals to the target system and contains 16 data outputs, 1 clock output, and 1 strobe output. All inputs and outputs are LVDS level. P6474 LVCMOS The P6474 provides LVCMOS signals to the target system and contains 16 data outputs, 1 clock output and 1 strobe output. Figure 18 on page 22 shows the P6474 input/output circuit. The Vcc of the output driver is adjustable from 1.2 V to 3.3 V.