ICS8761 Datasheet, PDF (9/15 Pages) Integrated Circuit Systems – LOW VOLTAGE, LOW SKEW, PCI / PCI-X CLOCK GENERATOR

Integrated
Circuit
Systems, Inc.
ICS8761
LOW VOLTAGE, LOW SKEW,
PCI / PCI-X CLOCK GENERATOR
PARAMETER MEASUREMENT INFORMATION
1.65V±5%
V_DD,
V_DDA, V_DDOx
LVCMOS
GND
SCOPE
Qx
2.05V±5% 1.25V±5%
V_DD,
V
DDA
V_DDOx
LVCMOS
GND
SCOPE
Qx
-1.165V±5%
3.3V OUTPUT LOAD AC TEST CIRCUIT
-1.25V±5%
3.3V/2.5V OUTPUT LOAD AC TEST CIRCUIT
V
DDOX
Qx
2
V
DDOX
Qy
2
t sk(o)
OUTPUT SKEW
V_DDO
Qx
2
V_DDO
Qy
2
t sk(o)
BANK SKEW (Where X denotes outputs in the same Bank)
QAx,
QBx,
QCx,
QDx
V
DDOX
2
tcycle n
V
DDOX
2
➤
tcycle n+1
t jit(cc) = tcycle n –tcycle n+1
1000 Cycles
CYCLE-TO-CYCLE JITTER
V
DDOX
2 ^REF_CL:K
➤
FB_IN
➤_t(Ø)
STATIC PHASE OFFSET
QAx, QBx,
QCx, QDx,
FB_OUT
t &t
PW
PERIOD
8761CY
V_DDOX
2
t _PW
V_DDOX
2
t _PERIOD
odc = ^{t PW}
t _PERIOD
V_DDOX
2
20%
Clock Outputs
80%
t
R
OUTPUT RISE/FALL TIME
www.icst.com/products/hiperclocks.html
9
V_DD
2
V_DD
2
80%
t
F
20%
REV. C SEPTEMBER 7, 2004