IDT
®
Four Output Differential Buffer for PCIe Gen 1 and Gen 2 ICS9DB403D REV R 11/1/12
ICS9DB403D
Four Output Differential Buffer for PCIe for Gen 1 and Gen 2
3
Pin Decription When OE_INV = 0
PIN # PIN NAME PIN TYPE DESCRIPTION
1VDDR PWR
3.3V power for differential input clock (receiver). This VDD should be treated
as an analog power rail and filtered appropriately.
2 SRC_IN IN 0.7 V Differential SRC TRUE input
3 SRC_IN# IN 0.7 V Differential SRC COMPLEMENTARY input
4 GND PWR Ground pin.
5 VDD PWR Power supply, nominal 3.3V
6 DIF_1 OUT 0.7V differential true clock output
7 DIF_1# OUT 0.7V differential Complementary clock output
8OE_1 IN
Active high input for enabling output 1.
0 =disable outputs, 1= enable outputs
9 DIF_2 OUT 0.7V differential true clock output
10 DIF_2# OUT 0.7V differential Complementary clock output
11 VDD PWR Power supply, nominal 3.3V
12 BYPASS#/PLL IN
Input to select Bypass(fan-out) or PLL (ZDB) mode
0 = Bypass mode, 1= PLL mode
13 SCLK IN Clock pin of SMBus circuitry, 5V tolerant.
14 SDATA I/O Data pin for SMBus circuitry, 5V tolerant.
15 PD# IN
Asynchronous active low input pin used to power down the device. The
internal clocks are disabled and the VCO and the crystal osc. (if any) are
stopped.
16 DIF_STOP# IN Active low input to stop differential output clocks.
17 HIGH_BW# IN
3.3V input for selecting PLL Band Width
0 = High, 1= Low
18 VDD PWR Power supply, nominal 3.3V
19 DIF_5# OUT 0.7V differential Complementary clock output
20 DIF_5 OUT 0.7V differential true clock output
21 OE_6 IN
Active high input for enabling output 6.
0 =disable outputs, 1= enable outputs
22 DIF_6# OUT 0.7V differential Complementary clock output
23 DIF_6 OUT 0.7V differential true clock output
24 VDD PWR Power supply, nominal 3.3V
25 OE_INV IN
This latched input selects the polarity of the OE pins.
0 = OE pins active high, 1 = OE pins active low (OE#)
26 IREF OUT
This pin establishes the reference for the differential current-mode output
pairs. It requires a fixed precision resistor to ground. 475ohm is the standard
value for 100ohm differential impedance. Other impedances require different
values. See data sheet.
27 GNDA PWR Ground pin for the PLL core.
28 VDDA PWR 3.3V power for the PLL core.
