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PDF ICS9248-192 Data sheet ( Hoja de datos )

Número de pieza ICS9248-192
Descripción Frequency Timing Generator for Transmeta Systems
Fabricantes Integrated Circuit Systems 
Logotipo Integrated Circuit Systems Logotipo



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No Preview Available ! ICS9248-192 Hoja de datos, Descripción, Manual

Integrated
Circuit
Systems, Inc.
ICS9248-192
Frequency Timing Generator for Transmeta Systems
Recommended Application:
Transmeta
Output Features:
• 1CPU(2.5V or 3.3V selectable) up to 66.6MHz &
overclocking of 66MHz.
• 6 PCI (3.3V) @ 33.3MHz (all are free running
selectable).
• 1 REF (3.3V) at 14.318MHz.
• 1 48MHz (3.3V).
• 1 24_48MHz selectable output.
Features:
• Supports Spread Spectrum modulation for CPU and
PCI clocks, default -0.4 downspread.
• Efficient Power management scheme through stop
clocks and power down modes.
• Uses external 14.318MHz crystal, no external load
cap required for CL=18pF crystal.
• 28-pin TSSOP package, 4.40mm (173mil).
Skew Characteristics:
• CPU – CPU <175ps
• PCI – PCI < 500ps
• CPU(early) – PCI = 1.5ns – 4ns.
Block Diagram
Pin Configuration
GNDREF
X1
X2
PD#
PCICLK0
PCICLK1
PCICLK2
GNDPCI
VDDPCI
PCICLK3
PCICLK4
PCICLK5
SDATA
SCLK
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28 VDDREF
27 REF
26 CPU_STOP#
25 VDDLCPU
24 GNDLCPU
23 CPUCLK0
22 PCI_STOP#
21 GND_Core
20 VDD_Core
19 SEL66/60#
18 VDD48
17 GND48
16 48MHz/CPU3.3v_2.5V#sel
15 24-48MHz/Sel48_24#
28-Pin TSSOP
PLL2
X1 XTAL
X2 OSC
PLL1
Spread
Spectrum
/2
CPU
DIVDER
Stop
48MHz
24_48MHz
REF
CPUCLK0
SEL48_24#
CPU3.3V_2.5V#sel
SEL66/60#
PD#
PCI_STOP#
CPU_STOP#
SDATA
SCLK
Control
Logic
Config.
Reg.
PCI
DIVDER
Stop
PCICLK (5:0)
6
Power Groups
VDD_Core, GND_Core = PLL core
VDDREF, GNDREF = REF, X1, X2
VDDPCI, GNDPCI = PCICLK (5:0)
VDD48, GND48 = 48MHz (1:0)
0540E—08/20/03

1 page




ICS9248-192 pdf
ICS9248-192
Serial Configuration Command Bitmap
Byte0: Functionality and Frequency Select Register (default = 0)
Bit
Bit
2,7:4
Bit3
Bit1
Bit0
Bit2 Bit7 Bit6 Bit5 Bit4
FS4 FS3 FS2 FS1 FS0
0000 0
0000 1
0001 0
0001 1
0010 0
0010 1
0011 0
0011 1
0100 0
0100 1
0101 0
0101 1
0110 0
0110 1
0111 0
0111 1
1000 0
CPU
60
60
60
60
66.6
66.6
66.6
66.6
67.32
68.64
69.96
72.6
61.5
63
64
65
60
PCI
30
30
30
30
33.3
33.3
33.3
33.3
33.66
34.32
34.98
36.3
30.75
31.5
32
32.5
30
Spread %
-0.4 % down spread
-0.6 % down spread
-0.8 % down spread
-1.0 % down spread
-0.4 % down spread
-0.6 % down spread
-0.8 % down spread
-1.0 % down spread
2% over-clocking
4% over-clocking
6% over-clocking
10% over-clocking
over-clocking
over-clocking
over-clocking
over-clocking
+/- 0.5% center spread
1 0 0 0 1 66.6
33.3 +/- 0.5% center spread
1001 0
50
1001 1
48
1 0 1 0 0 58.8
1 0 1 0 1 57.6
1 0 1 1 0 56.4
1011 1
54
25
24
29.4
28.8
28.2
27
under-clocking
under-clocking
2% under-clock
4% under-clock
6% under-clock
10% under-clock
1100 0
60
30 -1.4 % down spread
1100 1
1101 0
1101 1
60
60
60
30 -1.6 % down spread
30 -1.8 % down spread
30 -2.0 % down spread
1 1 1 0 0 66.6 33.3 -1.4 % down spread
1 1 1 0 1 66.6 33.3 -1.6 % down spread
1 1 1 1 0 66.6 33.3 -1.8 % down spread
1 1 1 1 1 66.6 33.3 -2.0 % down spread
Hardware latch inputs can only access these frequencies
0-Frequency is seleced by hardware select. Latched input
1-Frequency is seleced by Bit 2, 7:4
0-Normal 1-Spread spectrun Enabled
0-Running 1-Tristate all outputs
Note: PWD = Power-Up Default
PWD
00000
0
0
0
0540E—08/20/03
5

5 Page





ICS9248-192 arduino
ICS9248-192
Electrical Characteristics - 48MHz
TA = 0 - 70°C; VDD = 3.3 V , VDDL = 2.5V, +/-5%; CL = 10 - 20 pF (unless otherwise stated)
PARAMETER SYMBOL
CONDITIONS
MIN TYP
Output High Voltage VOH5 IOH = -12 mA
2.6
Output Low Voltage VOL5 IOL = 9 mA
Output High Current
IOH5 VOH = 2.0 V
Output Low Current
Rise Time1
Fall Time1
Duty Cycle1
IOL5 VOL = 0.8 V
tr5 VOL = 0.4 V, VOH = 2.4 V
tf5 VOH = 2.4 V, VOL = 0.4 V
dt5 VT = 1.5 V
16
45
Jitter1
tjcyc-cyc5 VT = 1.5 V, REF
tjabs5 VT = 1.5 V, REF
Jitter1
tjcyc-cyc5 VT = 1.5 V, 48 MHz
tjabs5 VT = 1.5 V, 48 MHz
MAX UNITS
V
0.4 V
-22 mA
mA
1.2 ns
1.2 ns
55 %
1000 ps
800 ps
500 ps
800 ps
Electrical Characteristics - PCICLK
TA = 0 - 70°C; VDD = 3.3 V, VDDL = 2.5V +/-5%; CL = 30 pF
PARAMETER SYMBOL
CONDITIONS
Output High Voltage VOH1 IOH = -18 mA
Output Low Voltage VOL1 IOL = 9.4 mA
Output High Current
IOH1 VOH = 2.0 V
Output Low Current
Rise Time1
Fall Time1
Duty Cycle1
Skew1
Jitter
IOL1
tr1
tf1
dt1
tsk1
tjcyc-cyc1
tjabs1
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 = 1.5 V
VT = 1.5 V
1Guaranteed by design, not 100% tested in production.
MIN TYP MAX UNITS
2.1 V
0.4 V
-22 mA
16 57 mA
2 ns
2 ns
45 55 %
500 ps
500 ps
500 ps
0540E—08/20/03
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