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PDF ICS9248-157 Data sheet ( Hoja de datos )
| Número de pieza | ICS9248-157 | |
| Descripción | Frequency Generator & Integrated Buffers | |
| Fabricantes | Integrated Circuit Systems | |
| Logotipo |  |
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Integrated
Circuit
Systems, Inc.
ICS9248-157
Frequency Timing Generator for Pentium II Systems
Recommended Application:
ALI1621/1632M style chipsets
Output Features:
• 2 - CPUs @2.5V, up to 140MHz.
• 7 - PCI @3.3V, (including one free running)
• 1 - 48MHz, @3.3V fixed.
• 2 - REF @3.3V, 14.318MHz.
Features:
• Up to 140 MHz frequency support
• Support power management: CPU, PCI stop and
Power down.
• Spread spectrum for EMI control (0.5% down spread).
• Uses external 14.318MHz crystal
• FS pins for frequency select
Key Specifications:
• CPU – CPU: <175ps
• PCI – PCI: <250ps
• CPU(early)-PCI: 1.5ns - 4ns
• PCI_E (early) - PCI: 2.1ns
Pin Configuration
*FS1/REF0
X1
X2
**FS2/PCICLK_F
*SEL_CPUF#/PCICLK0
PCICLK1
GND
VDDPCI
PCICLK2
PCICLK3
PCICLK4
PCICLK_E
VDD48
*FS3/48MHz
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28 VDDR
27 REF1/FS0*
26 SPREAD#
25 VDDL
24 CPUCLK1
23 CPUCLK0/F
22 GNDL
21 GND
20 PCI_STOP#
19 VDDA
18 CPU_STOP#
17 PD#
16 DIV/4#
15 GND
28 Pin 209mil SSOP
*These inputs have a 120K pull up to VDD
**These inputs have a 120K pull down to GND
Block Diagram
X1
X2
CPU_STOP#
FS (3:0)
PD#
Div4#
SPREAD#
SEL_CPUF#
PCI_STOP#
OSC
PLL
Spread
Spectrum
/4
Glitch
Free
Control
Logic
/2
/3
PLL2
CPU
STOP
CPU
STOP
BUS
STOP
2 REF (1:0)
2 CPUCLK 1
CPUCLK0/F
PCICLK (4:0),
5 PCICLK_E
PCICLK_F
48MHz
Functionality
FS3 FS2 FS1 FS0
0000
000 1
00 10
00 11
0 100
0 10 1
0 110
0 111
10 0 0
100 1
10 10
10 11
1 10 0
110 1
1 1 10
1111
CPU
33.33
63.33
69.99
66.66
97.00
96.22
91.50
83.33
50.00
95.25
105.00
100.00
66.66
126.35
139.65
133.33
PCI
16.66
31.66
35.00
33.33
32.33
32.07
30.50
27.77
16.66
31.75
35.00
33.33
16.66
31.66
35.00
33.33
9248-157 Rev A - 1/16/01
Third party brands and names are the property of their respective owners.
ICS reserves the right to make changes in the device data
identified in this publication without further notice. ICS advises
its customers to obtain the latest version of all device data to
verify that any information being relied upon by the customer is
1 page  
ICS9248-157
Electrical Characteristics - CPUCLK
TA = 0 - 70C; VDD = 3.3 V +/-5%, VDDL = 2.5 V +/-5%; CL = 10 - 20 pF (unless otherwise stated)
PARAMETER
SYMBOL
CONDITIONS
MIN
Output High Voltage
VOH2B IOH = -12.0 mA
Output Low Voltage
VOL2B IOL = 12 mA
Output High Current
IOH2B
VOH = 1.7 V
Output Low Current
IOL2B
VOL = 0.7 V
Rise Time
tr2B1 VOL = 0.4 V, VOH = 2.0 V
Fall Time
tf2B1 VOH = 2.0 V, VOL = 0.4 V
Duty Cycle
dt2B1
VT = 1.25 V
Skew
tsk2B1
VT = 1.25 V
Jitter, Cycle-to-cycle tjcyc-cyc2B1 VT = 1.25 V
Jitter, One Sigma
Jitter, Absolute
tj1s2B1
tjabs2B1
VT = 1.25 V
VT = 1.25 V
1Guaranteed by design, not 100% tested in production.
2
19
45
-250
TYP
2.3
0.2
-41
37
0.99
1.05
50.3
34
203
MAX
0.4
-19
1.6
1.6
55
175
250
150
+250
UNITS
V
V
mA
mA
ns
ns
%
ps
ps
ps
ps
Electrical Characteristics - PCICLK
TA = 0 - 70C; VDD = 3.3 V +/-5% VDDL = 2.5 V +/-5%; CL = 30 pF
PARAMETER
SYMBOL
CONDITIONS
Output High Voltage
Output Low Voltage
Output High Current
Output Low Current
Rise Time1
Fall Time1
Duty Cycle1
Skew1
Jitter, Cycle-to-cycle
Jitter, One Sigma1
Jitter, Absolute1
VOH1
VOL1
IOH1
IOL1
tr1
tf1
dt1
tsk1
tjcyc-cyc1
tj1s1
tjabs1
IOH = -11 mA
IOL = 9.4 mA
VOH = 2.0 V
VOL = 0.8 V
VOL = 0.4 V, VOH = 2.4 V
VOH = 2.4 V, VOL = 0.4 V
VT = 1.5 V
VT = 1.5 V
VT = 1.25 V
VT = 1.5 V
VT = 1.5 V
1Guaranteed by design, not 100% tested in production.
MIN
2.4
16
45
-250
TYP MAX UNITS
3.1 V
0.1 0.4 V
-62 -22 mA
57 mA
1.5 2 ns
1.1 2 ns
50 55 %
290 500
200 500
ps
ps
150 ps
250 ps
Third party brands and names are the property of their respective owners.
5
5 Page 
ICS9248-157
SY MBOL
A
A1
A2
b
c
D
E
E1
e
L
N
α
In Millimeters
COMMON DIMENSIONS
MIN MA X
- 2.00
0.05
-
1.65
1.85
0.22
0.38
0.09
0.25
SEE V A RIA TIONS
7.40
8.20
5.00
5.60
0.65 BA SIC
0.55
0.95
SEE V A RIA TIONS
0° 8°
In Inches
COMMON DIMENSIONS
MIN MA X
- .079
.002
-
.065
.073
.009
.015
.0035
.010
SEE V A RIA TIONS
.291
.323
.197
.220
0.0256 BA SIC
.022
.037
SEE V A RIA TIONS
0° 8°
V A RIA TIONS
N
28
D mm.
MIN MA X
9.90
10.50
D (inch)
MIN MA X
.390
M O-150 JE DE C
Doc.# 10-0033
.413
6/ 1/ 00 Rev B
Ordering Information
ICS9248yF-157-T
Example:
ICS XXXX y F - PPP - T
Designation for tape and reel packaging
Pattern Number (2 or 3 digit number for parts with ROM code patterns)
Package Type
F=SSOP
Revision Designator (will not correlate with datasheet revision)
Device Type (consists of 3 or 4 digit numbers)
Prefix
ICS, AV = Standard Device
Third party brands and names are the property of their respective owners.
11
ICS reserves the right to make changes in the device data
identified in this publication without further notice. ICS advises
its customers to obtain the latest version of all device data to
verify that any information being relied upon by the customer is
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet ICS9248-157.PDF ] | |
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