Pin List
Mnemonic:
Pin no.:
Pin Type:
Description:
SDIP, SDIN
8, 6
CML IN
Differential AC or DC coupled (2.5 Gbit/s, 1.25 Gbit/s, 655 Mbit/s
or 155 Mbit/s) Data input.
DIREF, DIREFN
9, 5
Termination
Termination for SDIP and SDIN. Normally terminated with 50
through 47 nF. For DC connected inputs connect to reference
voltage via 50
.
SLBIP, SLBIN
11, 10
CML IN
Differential Loop-Back Data inputs.
SDOP, SDON
28, 29
CML OUT
Data output, differential (2.5 Gbit/s, 1.25 Gbit/s, 655 Mbit/s or
155 Mbit/s), with internal 50
back termination.
SCOP, SCON
31, 32
CML OUT
Clock output, differential (2.5 Gbit/s, 1.25 Gbit/s, 655 Mbit/s or
155 Mbit/s), with internal 50
back termination.
RCIP, RCIN
17, 18
PECL IN
Differential 155.52 MHz or 38.88 MHz reference clock input.
DEC_ADJ
1
ANL IN
Decision level adjust.
VCTL
45
ANL IN
VCO voltage control input.
MON
48
ANL OUT
Input data level monitor output.
MON_REF
47
ANL OUT
Data level monitor reference voltage.
PCTL
41
ANL OUT
Charge pump control.
REF_SEL
20
LVTTL IN
Reference CLK Frequency Select.
0
155.52 MHz
1
38.88 MHz
CDR_SEL
15
LVTTL IN
Clock and Data recovery set-up.
0
Auto lock, 500 ppm.
1
Manual Phase Freq. detector PFC.
BRS0, BRS1
39, 40
LVTTL IN
Multi-rate Data input select.
BRS0
BRS1
0
0
0
1
1
0
1
1
Input
1.25 Gbit/s
155 Mbit/s
622 Mbit/s
2.5 Gbit/s
SBER0, SBER1
25, 26
LVTTL IN
BER select inputs.
SBER0 SBER1
0
0
0
1
1
0
1
1
0.5
×
10
-3
1
×
10
-3
2
×
10
-3
4
×
10
-3
SDOWN_L
22
LVTTL IN
SDOWN_L output disable select pin 1. Outputs set to logic 1
(SDOP=1 SDON=0) when pin set to VCC and LOCK_DET is
asserted.
SDOWN_G
21
LVTTL IN
SDOWN_G output disable select pin 2. Outputs set to logic 1
(SDOP=1 SDON=0) when pin set to VCC.
TCK
38
LVPECL IN
Leave open for normal operation. Only used at DC test.
SD_SEL
13
LVTTL IN
Data input Loop-Back or Limiting amplifier select
0
Loop-Back inputs
1
Limiting Amplifier inputs
SELTCK
36
LVTTL IN
Test-clock select. Connect to VCC for normal operation. Only
used for test purposes.
LOCK_DET
14
PCMOS OUT
Valid data loss alarm output. Asserted when the divided VCO fre-
quency deviates more than 500 ppm from reference frequency, or
BC_DET asserted(, or LOS_DET asserted (
–
bonding option)).
LOS_DET
35
PCMOS OUT
Loss Of Signal alarm output.
BC_DET
23
PCMOS OUT
Bit consecutive detect output.
VEE
16, 27, 33
PWR
Negative supply voltage.
VEEL
4, 7
PWR
Negative supply for Limiting Amplifier.
Data Sheet Rev.: 21
GD16522
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