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PDF ICS9148-13 Data sheet ( Hoja de datos )
| Número de pieza | ICS9148-13 | |
| Descripción | Frequency Generator & Integrated Buffers | |
| Fabricantes | Integrated Circuit Systems | |
| Logotipo |  |
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Integrated
Circuit
Systems, Inc.
ICS9148 - 13
Frequency Generator & Integrated Buffers for PENTIUMTM
General Description
The ICS9148-13 generates all clocks required for high speed
RISC or CISC microprocessor systems such as Intel Pentium
and PentiumPro. An output enable is provided for testability.
Spread Spectrum is available to modulate the CPU and BUS
PLL (leaving the REF, 24, 48 MHz operating normally). The
SS_EN# pin enables the spreading when low. The SS_TYPE
pin choses ±0.5% (nominally) center spread or +0, -2%
(nominally) downspread modulation.
High drive BUS outputs typically provide greater than 1V/ns
slew rate into 30 pF loads. CPU outputs typically provide
better than 1V/ns slew rate into 20 pF loads while maintaining
50 ±5% duty cycle. The REF clock outputs typically provide
better than 0.8/ns slew rates.
Block Diagram
Features
Generates twelve processor, six bus, two
14.31818MHz, 24MHz and one 48MHz clock for
USB support.
Synchronous clocks skew matched to 250 ps window
on CPUs and 500 ps window on BUSs
• CPU to BUS skew, 3.0 to 5.0ns (CPU Early)
3.0V - 3.7V supply range
48-pin SSOP package
Pin Configuration
48-Pin SSOP
Output Enable
OE
REF
24 48
(MHz) (MHz)
CPU
BUS
VCO
OSC
1 Runs Runs Runs Runs Runs Runs Runs
0
Tri-
state
Tri-
state
Tri-
state
Tri-
state
Tri-
state
Runs Runs
30K pullup resistor to VDD on OE, FS(0:2), SS_EN#, SS_TYPE
Functionality
FS2 FS1 FS0
000
00 1
0 10
0 11
10 0
10 1
1 10
111
CPU (1:12) in
MHz
75
100
75
83.3
50
60
66.67
55
BUS (1:6)
MHz
37.5
33.3
30.0
41.65
25
30
33.33
27.5
in
Pentium is a trademark of Intel Corporation
9148-13 Rev A 020398
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 current and accurate.
1 page  
Electrical Characteristics - BUS
TA = 0 - 70C; VDD = 3.3 V +/-5%; CL = 30 pF (unless otherwise stated)
PARAMETER
SYMBOL
CONDITIONS
Output Impedance
RDSP
1
1
VO = VDD*(0.5)
Output Impedance
RDSN11 VO = VDD*(0.5)
Output High Voltage
VOH1 IOH = -11 mA
Output Low Voltage
VOL1 IOL = 9.4 mA
Output High Current
IOH1 VOH = 2.0 V
Output Low Current
IOL1 VOL = 0.8 V
Rise Time
Fall Time
Duty Cycle
Skew
Jitter
tr11
tf11
dt
1
1
tsk11
tj1s11
tjabs11
VOL = 0.8 V, VOH = 2.4 V
VOH = 2.4 V, VOL = 0.8 V
VT = 1.5 V
VT = 1.5 V
VT = 1.5 V
VT = 1.5 V
1Guarenteed by design, not 100% tested in production.
ICS9148 - 13
MIN TYP MAX UNITS
12 55 Ω
12 55 Ω
2.4 3
V
0.2 0.4 V
-60 -22 mA
16 46
mA
1.7 2 ns
1.5 2 ns
45 51 55 %
200 500 ps
30 150 ps
-250 110 250 ps
5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet ICS9148-13.PDF ] | |
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