11995-202 查看數據表（PDF） - AMI Semiconductor
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11995-202 Datasheet PDF : 14 Pages
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AMERICAN MICROSYSTEMS, INC.
FS6233-01
Motherboard Clock Generator IC
September 2000
1.0 Features
• Generates all clocks required for single-processor
platforms, including:
M Two differential current-mode Host clock pairs
M Three 66.67MHz 3.3V CK66 clock outputs
M Ten 33.3MHz 3.3V PCI clock outputs
M Two 3.3V Memory Reference clock outputs
M Two 48MHz 3.3V CK48 clock outputs
M Two buffered copies of the crystal reference
• Control of current-mode Host clocks via IREF current
programming pin and ISEL_0:1 current multiplier pins
• Host clock frequency selection via the SEL_A,
SEL_B, and SEL133/100# pins
• Active-low PWR_DWN# signal allows one complete
clock cycle on each clock outputs and then shuts
down the crystal oscillator, PLLs, and outputs
• Spread-spectrum modulation (-0.5% at 31.5kHz) of
SSCG PLL clocks, enabled via SS_EN# input
• Supports test mode and tristate output control to fa-
cilitate board testing
• Available in a 48-pin SSOP and TSSOP
Figure 1: Block Diagram
XIN
XOUT
ISEL_0:1
Crystal
Oscillator
adjust
IREF
PWR_DWN#
SS_EN#
SEL133/100#
SEL_A:B
SSCG
PLL
Control
÷1
÷2
÷3
÷4
delay ÷2
÷4
PLL
FS6233
Figure 2: Pin Configuration
VDD_R
REF_0:1
VSS_R
VDD_H
HOST_P1:2
HOST_N1:2
VSS_H
VDD_66
CK66_0:2
VSS_66
VDD_P
PCI_0:7
VSS_P
VDD_M
MREF_P
MREF_N
VSS_M
VDD_48
CK48_0:1
VSS_48
Table 1: Clock Parameters
CLOCK
GROUP
HOST_P
HOST_N
MREF_P
MREF_N
CK66
PCI
CK48
REF
#
PINS
2
2
1
1
3
10
2
2
SUPPLY
VOLTAGE
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
SUPPLY
GROUP
VDD_H
VDD_M
VDD_66
VDD_P
VDD_48
VDD_R
FREQ.
(MHz)
133.33
100.00
66.67
50.00
66.67
33.33
48.008
14.318
PHASE SKEW
0°
180°
0°
180°
0°
0°
0°
0°
150ps
Pair to
Pair
-
250ps
300ps
-
-
Table 2: Clock Offsets
RELATION
PHASE
MIN
TYP
MAX
CK66 leads PCI
0°
1.5ns
3.5ns
REF_1 / ISEL_1 1
VDD_R 2
XIN 3
XOUT 4
VSS_P 5
PCI_0 6
PCI_1 7
VDD_P 8
PCI_2 9
PCI_3 10
VSS_P 11
PCI_4 12
PCI_5 13
VDD_P 14
PCI_6 15
PCI_7 16
VSS_P 17
PCI_8 18
PCI_9 19
VDD_P 20
SEL133/100# 21
VSS_48 22
CK48_0 / SEL_A 23
CK48_1 / SEL_B 24
48 REF_0 / ISEL_0
47 VSS_R
46 VDD_M
45 MREF_P
44 MREF_N
43 VSS_M
42 SS_EN#
41 HOST_P1
40 HOST_N1
39 VDD_H
38 HOST_P2
37 HOST_N2
36 VSS_H
35 IREF
34 VDD
33 VSS
32 PWR_DWN#
31 VDD_66
30 CK66_0
29 CK66_1
28 VSS_66
27 CK66_2
26 VDD_66
25 VDD_48
Intel and Pentium are registered trademarks of Intel Corporation. Lexmark is a trademark of Lexmark International, Inc. Non-linear spread spectrum modulation profile is licensed under US Patent
No. 5488627, Lexmark International, Inc. American Microsystems, Inc. reserves the right to change the detail specifications as may be required to permit improvements in the design of its products.
ISO9001
9.18.00
IntRGR
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