S2042/S2048
HIGH PERFORMANCE SERIAL INTERFACE CIRCUITS
Table 5. S2042 Pin Assignment and Descriptions (Continued)
Pin Name Level I/O
Pin # Description
OE0
OE1
Static
TTL
I
I
2
1
Active Low Output-Enable control for TX/TY outputs. When
inactive, TX/TY are disabled and remain in the logic Low state.
TTL
Active Low Output-Enable control for TLX/TLY outputs. When
inactive, TLX/TLY are disabled and remain in the logic Low
state.
REFSEL
RATESEL
ECLVCC
Static
TTL
I
I
18
15
Reference Select. Selects the reference clock frequency. See
Table 1.
TTL
+3.3 V
GND
Rate Select. Multilevel input used to select the operating speed
of the transmitter. See Table 1.
–
21, 39,
45
Core +3.3 V
TTLGND
TTLVCC
–
–
14
17
TTL Ground
+3.3 V/
+5 V
TTL/LVTTL Power Supply
ECLIOVCC
ECLIOVEE
AVCC
+3.3 V
GND
–
–
–
–
–
3, 10
6, 7
PECL I/O Power Supply
PECL I/O Ground
Analog Power Supply
Analog Ground
+3.3 V
GND
27, 32
26, 33
AVEE
ECLVEE
GND
13, 34,
40, 46,
51, 52
Core Ground
April 10, 2000 / Revision B
8
AMCC [ APPLIED MICRO CIRCUITS CORPORATION ]
