PACVGA200 Datasheet, PDF (7/10 Pages) California Micro Devices Corp – VGA PORT COMPANION CIRCUIT

PACVGA200
Test Circuit Information
Average Current through V_CC4 (I_CC4)
The circuit in Figure 1 was used to characterize I_CC4 current as SYNC_IN signal frequency varies. A square
wave signal was connected to the input of one of the SYNC buffers (i.e. pin 19 or pin 21). The frequency of this
signal was varied between 0 and 100 kHz. The risetime and falltime was kept constant at 10ns. Three different
values of C1 were used: 0pF, 50pF and 100pF. The results are plotted in Figure 2.
V_CC4
+5V
3.3V
0V
SYNC_IN
I_CC 4
SYNC_OUT
C1
Figure 1. Sync Buffer I_CC4 Test Circuit
Figure 2. I_CC4 vs. SYNC_IN Frequency Performance Data
Rev. 2 | Page 7 of 10 | www.onsemi.com