SY69952_05 Datasheet, PDF (7/8 Pages) Micrel Semiconductor – OC-3/STS-3 CLOCK RECOVERING TRANSCEIVER

Micrel, Inc.
SY69952
AC ELECTRICAL CHARACTERISTICS
VCC = +5V ±5%; VEE = GND = 0V, TA = 0°C to +85°C
Symbol
fREF
Parameter
Reference Frequency
fB
Bit Time⁽¹⁾
tODC
Output Duty Cycle⁽²⁾
(TCLK±, RCLK±)
Min.
6.41
19.24
19.5
6.50
48
Typ.
6.48
19.44
19.3
6.43
—
Max.
6.55
19.64
19.1
6.36
52
Units
MHz
MHZ
ns
ns
%
tRF
ECL Output Rise/Fall Tiime⁽²⁾
0.4
—
1.2
ns
tLOCK
PLL Lock Time⁽²⁾
—
—
1
µs
tRPWH
REFCLK Pulse Width High
3.3
—
—
ns
10
—
—
ns
tRPWL
REFCLK Pulse Width Low
3.3
—
—
ns
10
—
—
ns
tDV
Data Valid
3
—
—
ns
tDH
Data Hold
1
—
—
ns
tPD
Propagation Delay⁽³⁾
—
—
10
ns
(RIN to ROUT, TSER to TOUT)
NOTES:
1. fB is calculated as 1/(fREF * 8).
2. Tested initially and after any design or process changes that may affect these parameters.
3. The ECL switching threshold is the differential zero crossing (ie, the point where + and – signals cross).
Condition
MODE = 0
MODE = 1
MODE = 0
MODE = 1
5pf load, 50Ω to VCC –2 (20% to 80%)
RIN transition density 25%
MODE = 0
MODE = 1
MODE = 0
MODE = 1
Prior to RCLK+ rising edge
After RCLK+ rising edge
TIMING WAVEFORMS
M9999-062805
7
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