IDT
Eighteen Output Differential Buffer w/2 input mux for PCIe Gen3
1678A—07/13/10
9EX21831
Eighteen Output Differential Buffer w/2 input mux for PCIe Gen3
3
Pin Description
PIN #
PIN NAME
PIN TYPE
DESCRIPTION
1
VDD
PWR
Power supply, nominal 3.3V
2OE10#
IN
Active low input for enabling DIF pair 10.
1 = tri-state outputs, 0 = enable outputs
3
DIF_10
OUT
0.7V differential true clock output
4
DIF_10#
OUT
0.7V differential complement clock output
5OE11#
IN
Active low input for enabling DIF pair 11.
1 = tri-state outputs, 0 = enable outputs
6
DIF_11
OUT
0.7V differential true clock output
7
DIF_11#
OUT
0.7V differential complement clock output
8OE12#
IN
Active low input for enabling DIF pair 12.
1 = tri-state outputs, 0 = enable outputs
9
DIF_12
OUT
0.7V differential true clock output
10
DIF_12#
OUT
0.7V differential complement clock output
11
GND
PWR
Ground pin.
12
VDD
PWR
Power supply, nominal 3.3V
13
DIF_13
OUT
0.7V differential true clock output
14
DIF_13#
OUT
0.7V differential complement clock output
15
OE13#
IN
Active low input for enabling DIF pair 13.
1 = tri-state outputs, 0 = enable outputs
16
DIF_14
OUT
0.7V differential true clock output
17
DIF_14#
OUT
0.7V differential complement clock output
18
OE14#
IN
Active low input for enabling DIF pair 14.
1 = tri-state outputs, 0 = enable outputs
19
DIF_15
OUT
0.7V differential true clock output
20
DIF_15#
OUT
0.7V differential complement clock output
21
VDD
PWR
Power supply, nominal 3.3V
22
OE15_17#
IN
Active low input for enabling DIF pairs 15, 16 and 17
1 = tri-state outputs, 0 = enable outputs
23
DIF_16
OUT
0.7V differential true clock output
24
DIF_16#
OUT
0.7V differential complement clock output
25
DIF_17
OUT
0.7V differential true clock output
26
DIF_17#
OUT
0.7V differential complement clock output
27
IREF
OUT
This pin establishes the reference current for the differential current-mode output pairs. This pin
requires a fixed precision resistor tied to ground in order to establish the appropriate current. 475
ohms is the standard value.
28
GNDA
PWR
Ground pin for the PLL core.
29
VDDA
PWR
3.3V power for the PLL core.
30
CLKA_IN
IN
True Input for differential reference clock.
31
CLKA_IN#
IN
Complement Input for differential reference clock.
32
GND
PWR
Ground pin.
33
CLKB_IN
IN
True Input for differential reference clock.
34
CLKB_IN#
IN
35
VDD
PWR
Power supply, nominal 3.3V
36
OE_01234#
IN
Active low input for enabling DIF pairs 0, 1, 2, 3 and 4.
1 = tri-state outputs, 0 = enable outputs