ICS9248-192 Datasheet, PDF (1/12 Pages) Integrated Circuit Systems – Frequency Timing Generator for Transmeta Systems

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
1
X1
2
X2
3
PD#
4
PCICLK0
5
PCICLK1
6
PCICLK2
7
GNDPCI
8
VDDPCI
9
PCICLK3 ¹⁰
PCICLK4 ¹¹
PCICLK5 ¹²
SDATA 13
SCLK 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