Integrated
Circuit
Systems, Inc.
ICS9248-101
Frequency Generator & Integrated Buffers for PENTIUM/ProTM & K6
General Description
The ICS9248-101 is the single chip clock solution for
Notebook designs using the 440BX or the VIA Apollo Pro 133
style chipset. It provides all necessary clock signals for such a
system.
Features
Spread spectrum may be enabled through I2C programming.
Spread spectrum typically reduces system EMI by 8dB to
10dB. This simplifies EMI qualification without resorting to
board design iterations or costly shielding. The ICS9248-101
employs a proprietary closed loop design, which tightly
controls the percentage of spreading over process and
temperature variations.
Up to 137MHz frequency support
Spread Spectrum for EMI control
Serial I2C interface for Power Management,
Frequency Select, Spread Spectrum.
Provides the following system clocks
- 4-CPUs @ 2.5/3.3V, up to 137MHz.
(including CPUCLK_F)
- 9-SDRAMs @3.3V, up to 137MHz
(including SDRAM_F)
- 8-PCI @3.3V, CPU/2 or CPU/3
(including 1 free running PCICLK_F)
- 1-24/48MHz @3.3V
- 1-48MHz @3.3V fixed
- 2-REF @3.3V, 14.318MHz.
Efficient Power management scheme through PCI
and STOP CLOCKS
Spread Spectrum ± .25%, & 0 to -0.5% down spread
Block Diagram
VDDREF
REF0
GNDREF
X1
X2
VDDPCI
*CPU2.5_3.3#/PCICLK_F
*FS3/PCICLK0
GNDPCI
*SEL24_48#/PCICLK1
PCICLK2
PCICLK3
PCICLK4
VDDPCI
BUFFER IN
GNDPCI
PCICLK5
PCICLK6
VDDCOR
PCI_STOP#
*PD#
GND48
SDATA
2
I C
SCLK
{
Power Groups
VDDLCPU, GNDLCPU = CPUCLK [2:0], CPUCLK_F
VDDSDR, GNDSDR = SDRAMCLKS [7:0], SDRAM_F
VDDPCI, GNDPCI = PCICLKS [6:0], PCICLK_F
VDD48, GND48 = 48MHz, 24MHz
VDDREF, GNDREF = REF, X1, X2
VDDCOR = PLL CORE
9248-101 Rev C 2/29/00
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
ICS9248-101
Pin Configuration
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
REF1/FS2*
VDDLCPU
CPUCLK_F
CPUCLK0
GNDLCPU
CPUCLK1
CPUCLK2
CLK_STOP#
GNDSDR
SDRAM_F
SDRAM0
SDRAM1
VDDSDR
SDRAM2
SDRAM3
GNDSDR
SDRAM4
SDRAM5
VDDSDR
SDRAM6
SDRAM7
VDD48
48MHz/FS0*
24_48MHz/FS1*
48-Pin SSOP and TSSOP
* Internal Pull-up Resistor of 120K to VDD
Pentium is a trademark of Intel Corporation
I2C is a trademark of Philips Corporation
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.
ICS9248-101
Pin Descriptions
PIN
NUMBER
1
2
20
3, 9, 16,
33, 40, 44
4
5
6,14
7
8
10
18, 17, 13,
12, 11,
15
19
21
22
28, 29, 31, 32,
34, 35, 37, 38
30, 36
23
24
25
26
27
39
41
42, 43, 45
46
47
48
P I N NA M E
VDDREF
REF0
PCI_STOP#
GND
X1
TYPE
PWR
OUT
IN
PWR
IN
X2
VDDPCI
C P U 2 . 5 _ 3 . 3 # 1,2
PCICLK_F
FS31,2
OUT
PWR
IN
OUT
IN
DESCRIPTION
Ref, XTAL power supply, nominal 3.3V
14.318 Mhz reference clock.This REF output is the STRONGER buffer for ISA BUS loads
Halts PCICLK [6:0]clocks at logic 0 level, when input low (In mobile mode, MODE=0)
Ground
Crystal input, has internal load cap (36pF) and feedback
resistor from X2
Crystal output, nominally 14.318MHz.
Supply for PCICLK_F and PCICLK [6:0], nominal 3.3V
Indicates whether VDDLCPU is 2.5 or 3.3V. High=2.5V CPU, LOW=3.3V CPU. Latched Input.
Free running PCI clock not affected by PCI_STOP# for power management.
Frequency select pin. Latched Input.
PCICLK0
OUT
PCI clock output. Synchronous to CPU clocks with 1-4ns skew (CPU early)
SEL24_48#1,2
PCICLK1
IN
OUT
Selects either 24 or 48MHz when Low =48 MHz
PCI clock output. Synchronous to CPU clocks with 1-4ns skew (CPU early)
PCICLK [6:2]
OUT
PCI clock outputs. Synchronous to CPU clocks with 1-4ns skew (CPU early)
BUFFER IN
VDDCOR
IN
PWR
GND48
PWR
Input to Fanout Buffers for SDRAM outputs.
Power pin for the PLL core. 3.3V
Asynchronous active low input pin used to power down the device into a low power state. The
internal clocks are disabled and the VCO and the crystal are stopped. The latency of the power
down will not be greater than 4ms.
Ground pin for the 24 & 48MHz output buffers & fixed PLL core.
SDRAM [7:0]
OUT
SDRAM clock outputs, Fanout Buffer outputs from BUFFER IN pin (controlled by chipset).
VDDSDR
SDATA
SCLK
24_48MHz
FS11, 2
48MHz
FS01, 2
VDD48
SDRAM_F
CLK_STOP#
CPUCLK [2:0]
CPUCLK_F
VDDLCPU
REF1
FS21, 2
PWR
IN
IN
OUT
IN
OUT
IN
PWR
OUT
IN
OUT
OUT
PWR
OUT
IN
Supply for SDRAM [7:0] and CPU PLL Core, nominal 3.3V.
Data input for I2C serial input, 5V tolerant input
Clock input of I2C input, 5V tolerant input
24MHz or 48MHz output clock selectable by pin 10
Frequency select pin. Latched Input.
48MHz output clock
Frequency select pin. Latched Input
Power for 24 & 48MHz output buffers and fixed PLL core.
Free running SDRAM clock output. Not affected by CPU_STOP#
This asynchronous input halts CPUCLK(0:2), & SDRAM (0:7) at logic "0" level when driven low.
CPU clock outputs, powered by VDDLCPU
Free running CPU clock. Not affected by the CPU_STOP#
Supply for CPU clocks 2.5V
14.318 MHz reference clock.
Frequency select pin. Latched Input
PD#1
IN
Notes:
1: Internal Pull-up Resistor of 120K to 3.3V on indicated inputs
2: Bidirectional input/output pins, input logic levels are latched at internal power-on-reset. Use 10Kohm resistor
to program logic Hi to VDD or GND for logic low.
2
ICS9248-101
General I2C serial interface information
The information in this section assumes familiarity with I2C programming.
For more information, contact ICS for an I2C programming application note.
How to Write:
How to Read:
Controller (host) sends a start bit.
Controller (host) sends the write address D2 (H)
ICS clock will acknowledge
Controller (host) sends a dummy command code
ICS clock will acknowledge
Controller (host) sends a dummy byte count
ICS clock will acknowledge
Controller (host) starts sending first byte (Byte 0)
through byte 5
ICS clock will acknowledge each byte one at a time.
Controller (host) sends a Stop bit
Controller (host) will send start bit.
Controller (host) sends the read address D3 (H)
ICS clock will acknowledge
ICS clock will send the byte count
Controller (host) acknowledges
ICS clock sends first byte (Byte 0) through byte 5
Controller (host) will need to acknowledge each byte
Controller (host) will send a stop bit
How to Write:
Controller (Host)
Start Bit
Address
D2(H)
ICS (Slave/Receiver)
How to Read:
Controller (Host)
Start Bit
Address
D3(H)
ACK
Dummy Command Code
ACK
ACK
Byte Count
Dummy Byte Count
ACK
ACK
ACK
ACK
ACK
ACK
ACK
ACK
ACK
ACK
ACK
ACK
ACK
ACK
Stop Bit
Byte 0
Byte 0
Byte 1
Byte 1
Byte 2
Byte 2
Byte 3
Byte 3
Byte 4
Byte 4
Byte 5
Byte 5
Stop Bit
Notes:
1.
2.
3.
4.
5.
6.
ICS (Slave/Receiver)
The ICS clock generator is a slave/receiver, I2C component. It can read back the data stored in the latches for verification.
Read-Back will support Intel PIIX4 "Block-Read" protocol.
The data transfer rate supported by this clock generator is 100K bits/sec or less (standard mode)
The input is operating at 3.3V logic levels.
The data byte format is 8 bit bytes.
To simplify the clock generator I2C interface, the protocol is set to use only "Block-Writes" from the controller. The
bytes must be accessed in sequential order from lowest to highest byte with the ability to stop after any complete byte
has been transferred. The Command code and Byte count shown above must be sent, but the data is ignored for those
two bytes. The data is loaded until a Stop sequence is issued.
At power-on, all registers are set to a default condition, as shown.
3
ICS9248-101
Functionality
VDD = 3.3V±5%, VDDL= 2.5V±5% or 3.3±5%, TA=0 to 70°C
Crystal (X1, X2) = 14.31818MHz
FS3
FS2
FS1
FS0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
CPU
(MHz)
124.00
120.00
114.99
109.99
105.00
83.31
137.00
75.00
100.00
95.00
83.31
133.33
90.00
96.22
66.82
91.5
PCI
(MHz)
41.33
40.00
38.33
36.66
35.00
41.65
34.25
37.50
33.33
31.67
27.77
33.33
30.00
32.07
33.41
30.5
Serial Configuration Command Bitmap
Byte0: Functionality and Frequency Select Register (default = 0)
Bit
Bit 7
Bit
[2, 6:4]
Bit 3
Bit 1
Bit 0
Description
0 - ±0.25% Spread Spectrum Modulation, Center Spread
1 - 0 to -0.5% Down Spread
CPUCLK
PCICLK
Bit [2, 6:4]
(MHz)
(MHz)
0000
124.00
41.33
0001
120.00
40.00
0010
114.99
38.33
0011
109.99
36.66
0100
105.00
35.00
0101
83.31
41.65
0110
137.00
34.25
0111
75.00
37.50
1000
100.00
33.33
1001
95.00
31.67
1010
83.31
27.77
1011
133.33
33.33
1100
90.00
30.00
1101
96.22
32.07
1110
66.82
33.41
1111
91.5
30.5
0 - Frequency is selected by hardware select, latched inputs
1 - Frequency is selected by Bit [2, 6:4]
0 - Normal
1 - Spread Spectrum Enabled
0 - Running
1- Tristate all outputs
4
PWD
1
Note1
0
1
0
Notes:
1, Default at Power-up will be for latched
logic inputs to define frequency. Bit [2,
6:4] are default to 0010.
2, PWD = Power-Up Default
3, When disabling spread spectrum bit7
needs to be set to 0 to maintain nominal
frequency.
ICS9248-101
Byte 1: CPU, Active/Inactive Register (1 = enable, 0 = disable)
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Pin #
46
39
42
43
45
PWD
1
1
1
1
1
1
1
1
Description
(Reserved)
CPUCLK_F (Act/Inact)
(Reserved)
(Reserved)
SDRAM_F (Act/Inact)
CPUCLK2 (Act/Inact)
CPUCLK1 (Act/Inact)
CPUCLK0 (Act/Inact)
Byte 2: PCI Active/Inactive Register (1 = enable, 0 = disable)
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Pin #
7
18
17
13
12
11
10
8
PWD
1
1
1
1
1
1
1
1
Description
PCICLK_F (Act/Inact)
PCICLK6 (Act/Inact)
PCICLK5 (Act/Inact)
PCICLK4 (Act/Inact)
PCICLK3 (Act/Inact)
PCICLK2 (Act/Inact)
PCICLK1 (Act/Inact)
PCICLK0 (Act/Inact)
Byte 3: SDRAM Active/Inactive Register (1 = enable, 0 = disable)
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Pin #
28
29
31
32
PWD
1
1
1
1
1
1
1
1
Description
(Reserved)
(Reserved)
(Reserved)
(Reserved)
SDRAM7 (Active/Inactive)
SDRAM6 (Active/Inactive)
SDRAM5 (Active/Inactive)
SDRAM4 (Active/Inactive)
Notes:
1. Inactive means outputs are held LOW and are disabled from switching.
2. Latched Frequency Selects (FS#) will be inverted logic load of the input frequency select pin conditions.
5
ICS9248-101
Byte 4: Reserved Active/Inactive Register (1 = enable, 0 = disable)
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Pin #
-
PWD
1
1
1
1
X
1
X
1
Description
(Reserved)
(Reserved)
(SEL24_48)#
(Reserved)
Latched FS1#
(Reserved)
Latched FS3#
(Reserved)
Byte 5: Peripheral Active/Inactive Register (1 = enable, 0 = disable)
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Pin #
34
35
37
38
26
25
48
2
PWD
1
1
1
1
1
1
1
1
Description
SDRAM3 (Act/Inact)
SDRAM2 (Act/Inact)
SDRAM1 (Act/Inact)
SDRAM0 (Act/Inact)
48MHz (Act/Inact)
24MHz (Act/Inact)
REF1 (Act/Inact)
REF0 (Act/Inact)
Notes:
1. Inactive means outputs are held LOW and are disabled from switching.
2. Latched Frequency Selects (FS#) will be inverted logic load of the input frequency select pin conditions.
6
ICS9248-101
CLK_STOP# Timing Diagram
CLK_STOP# is an asychronous input to the clock synthesizer. It is used to turn off the CPU clocks for low power operation.
CLK_STOP# is synchronized by the ICS9248-101. The minimum that the CPU clock is enabled (CLK_STOP# high pulse) is 100
CPU clocks. All other clocks will continue to run while the CPU clocks are disabled. The CPU clocks will always be stopped in
a low state and start in such a manner that guarantees the high pulse width is a full pulse. CPU clock on latency is less than 4
CPU clocks and CPU clock off latency is less than 4 CPU clocks.
INTERNAL
CPUCLK
PCICLK [6:0]
CLK_STOP#
PCI_STOP# (High)
SDRAM [7:0]
CPUCLK [2:0]
CPUCLK _F
SDRAM_F
Notes:
1. All timing is referenced to the internal CPU clock.
2. CLK_STOP# is an asynchronous input and metastable conditions may exist. This signal is synchronized
to the CPU clocks inside the ICS9248-101.
3. SDRAM-F output is controlled by Buffer in signal, not affected by the ICS9248-101
CLK_STOP# signal. SDRAM [7:0] are controlled as shown.
4. All other clocks continue to run undisturbed.
7
ICS9248-101
PD# Timing Diagram
The power down selection is used to put the part into a very low power state without turning off the power to the part. PD# is
an asynchronous active low input. This signal needs to be synchronized internal to the device prior to powering down the clock
synthesizer.
Internal clocks are not running after the device is put in power down. When PD# is active low all clocks need to be driven to a
low value and held prior to turning off the VCOs and crystal. The power up latency needs to be less than 4 mS. The power down
latency should be as short as possible but conforming to the sequence requirements shown below. PCI_STOP# and CLK_STOP#
are considered to be don't cares during the power down operations. The REF and 48MHz clocks are expected to be stopped in
the LOW state as soon as possible. Due to the state of the internal logic, stopping and holding the REF clock outputs in the
LOW state may require more than one clock cycle to complete.
PD#
CPUCLK
PCICLK
VCO
Crystal
Notes:
1. All timing is referenced to the Internal CPUCLK (defined as inside the ICS9248 device).
2. As shown, the outputs Stop Low on the next falling edge after PD# goes low.
3. PD# is an asynchronous input and metastable conditions may exist. This signal is synchronized inside this part.
4. The shaded sections on the VCO and the Crystal signals indicate an active clock.
5. Diagrams shown with respect to 133MHz. Similar operation when CPU is 100MHz.
8
ICS9248-101
PCI_STOP# Timing Diagram
PCI_STOP# is an asynchronous input to the ICS9248-101. It is used to turn off the PCICLK [6:0] clocks for low power
operation. PCI_STOP# is synchronized by the ICS9248-101 internally. The minimum that the PCICLK [6:0] clocks are enabled
(PCI_STOP# high pulse) is at least 10 PCICLK [6:0] clocks. PCICLK [6:0] clocks are stopped in a low state and started with a full
high pulse width guaranteed. PCICLK [6:0] clock on latency cycles are only three rising PCICLK clocks, off latency is one
PCICLK clock.
CPUCLK
(Internal)
PCICLK_F
(Internal)
PCICLK_F
(Free-running)
CLK_STOP#
PCI_STOP#
PCICLK [6:0]
Notes:
1. All timing is referenced to the Internal CPUCLK (defined as inside the ICS9248 device.)
2. PCI_STOP# is an asynchronous input, and metastable conditions may exist. This signal is required to be synchronized
inside the ICS9248.
3. All other clocks continue to run undisturbed.
4. CLK_STOP# is shown in a high (true) state.
9
ICS9248-101
Shared Pin Operation Input/Output Pins
These figures illustrate the optimal PCB physical layout
options. These configuration resistors are of such a large
ohmic value that they do not effect the low impedance clock
signals. The layouts have been optimized to provide as little
impedance transition to the clock signal as possible, as it
passes through the programming resistor pad(s).
The I/O pins designated by (input/output) on the ICS9248101 serve as dual signal functions to the device. During
initial power-up, they act as input pins. The logic level
(voltage) that is present on these pins at this time is read and
stored into a 4-bit internal data latch. At the end of Power-On
reset, (see AC characteristics for timing values), the device
changes the mode of operations for these pins to an output
function. In this mode the pins produce the specified buffered
clocks to external loads.
To program (load) the internal configuration register for these
pins, a resistor is connected to either the VDD (logic 1)
power supply or the GND (logic 0) voltage potential. A 10
Kilohm(10K) resistor is used to provide both the solid CMOS
programming voltage needed during the power-up
programming period and to provide an insignificant load on
the output clock during the subsequent operating period.
Figs. 1 and 2 show the recommended means of implementing
this function. In Fig. 1 either one of the resistors is loaded
onto the board (selective stuffing) to configure the devices
internal logic. Figs. 2a and b provide a single resistor loading
option where either solder spot tabs or a physical jumper
header may be used.
Fig. 1
10
ICS9248-101
Fig. 2a
Fig. 2b
11
ICS9248-101
Absolute Maximum Ratings
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . .
Logic Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ambient Operating Temperature . . . . . . . . . . . .
Case Temperature . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature . . . . . . . . . . . . . . . . . . . . . .
7.0 V
GND 0.5 V to VDD +0.5 V
0°C to +70°C
115°C
65°C to +150°C
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are stress
specifications only and functional operation of the device at these or any other conditions above those listed in the operational
sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
product reliability.
Electrical Characte ristics - Input/Supply/Com m on Output Param ete rs
T A = 0 - 70C; Supply Voltage VD D = VD D L = 3.3 V +/-5% (unles s otherwis e s tated)
PA RA M ETER
Input High Voltage
Input Low Voltage
SYM BOL
VIH
VIL
Operating Supply
Current
IDD3.3 OP
Powerdown Current
Input Frequency
ID D P D
Fi
CL = 0 pF; Input address VDD or GND
VD D = 3.3 V
CIN
CIN X
Logic Inputs
X1 & X2 pins
T STA B
From VD D = 3.3 V to 1% target Freq.
Input Capacitance
Clk Stabilization
Skew
1
1
1
1
t CP U -P CI1
CONDITIONS
M IN
2
VSS -0.3
UNITS
V
V
90
120
151
MAX
VD D +0.3
0.8
150
170
180
12
250
14.318
600
16
µA
M Hz
27
36
5
45
pF
pF
5.5
ms
4
ns
C L = 0 pF; Select @ 66M Hz
C L = 0 pF; Select @ 100M Hz
C L = 0 pF; Select @ 133M Hz
VT = 1.5 V
1
TYP
2.8
mA
Guaranteed by des ign, not 100% tes ted in production.
Ele ctrical Characte ristics - Input/Supply /Com m on Output Param e te rs
T A = 0 - 70º C; Supply Voltage VD D = 3.3 V +/-5%, VD D L = 2.5 V +/-5% (unles s otherwis e s tated)
PA RA M ETER
SYMBOL
Operating SupplyCurrent
ID D L 2 .5
Powerdown Current
Skew
1
1
ID D L P D
t CP U -P CI2
CONDITIONS
CL = 0 pF; Select @ 66.8 M Hz
CL = 0 pF; Select @ 100 M Hz
CL = 0 pF; Select @ 133 M Hz
M IN
CL = 0 pF; Input address VDD or GN D
VT = 1.5 V; VTL = 1.25 V
Guaranteed by des ign, not 100% tes ted in production.
12
1
TYP
8
11
17
UNITS
<1
MAX
15
18
20
10
2.4
4
ns
mA
µA
ICS9248-101
Electrical Characteristics - CPU
TA = 0 - 70C; VDD = 3.3 V +/-5%; CL = 20 pF
PARAMETER
SYMBOL
IOH = -20 mA
Output High Voltage
VOH2A
Output Low Voltage
VOL2A
IOL = 12 mA
Output High Current
IOH2A
VOH = 2.0 V
VOL = 0.8 V
Output Low Current
IOL2A
tr2A
VOL = 0.4 V, VOH = 2.4 V
Fall Time1
tf2A
dt2A
VOH = 2.4 V, VOL = 0.4 V
tsk2A
VT = 1.5 V
tjcyc-cyc2A
VT = 1.5 V
Duty Cycle
1
Skew window
Jitter, Cycle-to-cycle1
MIN
2.4
22
Rise Time1
1
1
CONDITIONS
VT = 1.5 V
TYP
2.85
0.31
-45
29
1.5
1.4
MAX UNITS
V
0.4
V
-27
mA
mA
2
ns
2
ns
55
%
80
175
ps
200
250
ps
45
Guaranteed by design, not 100% tested in production.
Electrical Characteristics - CPU
TA = 0 - 70C; VDDL = 2.5 V +/-5%; CL = 20 pF
PARAMETER
SYMBOL
Output High Voltage
VOH2B
IOH = -12 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
Fall Time
1
1
1
CONDITIONS
MIN
2
22
tr2B
VOL = 0.4 V, VOH = 2.0 V
tf2B
VOH = 2.0 V, VOL = 0.4 V
VT = 1.25 V, < 133 MHz
VT = 1.25 V, >= 133 MHz
45
42
TYP
2.3
0.31
-39
26
MAX UNITS
V
0.4
V
-21
mA
mA
1.3
1.6
ns
1.4
47.5
47
1.6
55
52
ns
Duty Cycle1
dt2B
Skew window1
Jitter, Cycle-to-cycle1
tsk2B
VT = 1.25 V
70
175
ps
tjcyc-cyc2B
VT = 1.25 V
200
300
ps
Guaranteed by design, not 100% tested in production.
13
%
ICS9248-101
Electrical Characteristics - PCI
TA = 0 - 70C; VDD = VDDL = 3.3 V +/-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
IOL1
VOL = 0.8 V
Rise Time
Fall Time
1
1
1
Duty Cycle
1
Skew window
1
Jitter, One Sigma
Jitter, Absolute1
1
MIN
2.4
38
TYP
3
0.2
-62
43
MAX UNITS
V
0.4
V
-33
mA
mA
tr1
VOL = 0.4 V, VOH = 2.4 V
1.5
2
ns
tf1
VOH = 2.4 V, VOL = 0.4 V
1.5
2
ns
dt1
VT = 1.5 V
50
55
%
tsk1
VT = 1.5 V
180
500
ps
tj1s1
VT = 1.5 V
15
150
ps
tjabs1
VT = 1.5 V
-250
75
250
ps
MIN
2.4
TYP
3
0.3
-69
42
1
45
Guaranteed by design, not 100% tested in production.
Electrical Characteristics - SDRAM
TA = 0 - 70C; VDD = VDDL = 3.3 V +/-5%; CL = 30 pF
PARAMETER
Output High Voltage
Output Low Voltage
Output High Current
Output Low Current
Rise Time1
SYMBOL
VOH3
VOL3
IOH3
IOL3
Tr3
Fall Time1
Tf3
VOH = 2.4 V, VOL = 0.4 V
Duty Cycle
1
1
Skew window
CONDITIONS
IOH = -28 mA
IOL = 19 mA
VOH = 2.0 V
VOL = 0.8 V
VOL = 0.4 V, VOH = 2.4 V
32
MAX UNITS
V
0.4
V
-46
mA
mA
1.3
ns
1.3
2
ns
Dt3
VT = 1.5 V
50
55
%
Tsk3
VT = 1.5 V
185
250
ps
Tsk3
VT = 1.5 V
4
5
ns
45
1
Propagation Time
(Buffer In to output)
1
Guaranteed by design, not 100% tested in production.
14
ICS9248-101
Electrical Characteristics - 24,48MHz, REF(0:1)
TA = 0 - 70C; VDD = VDDL = 3.3 V +/-5%; CL = 10 - 20 pF (unless otherwise stated)
PARAMETER
SYMBOL
CONDITIONS
Output High Voltage
VOH5
IOH = -14 mA
IOL = 6 mA
Output Low Voltage
VOL5
VOH = 2.0 V
Output High Current
IOH5
VOL = 0.8 V
Output Low Current
IOL5
Rise Time
Fall Time
1
1
1
Duty Cycle
1
Jitter, One Sigma
Jitter, Absolute1
1
MIN
2.4
16
TYP
2.6
0.22
-32
22
MAX UNITS
V
0.4
V
-20
mA
mA
tr5
VOL = 0.4 V, VOH = 2.4 V
2
4
ns
tf5
VOH = 2.4 V, VOL = 0.4 V
2
4
ns
dt5
VT = 1.5 V
1
55
%
tj1s5
VT = 1.5 V
150
250
ps
tjabs5
VT = 1.5 V
600
ps
45
-600
Guaranteed by design, not 100% tested in production.
15
ICS9248-101
Ordering Information
ICS9248yF-101-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
16
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.
ICS9248-101
Ordering Information
ICS9248yG-101-T
Example:
ICS XXXX y G - PPP - T
Designation for tape and reel packaging
Pattern Number (2 or 3 digit number for parts with ROM code patterns)
Package Type
G=TSSOP
Revision Designator (will not correlate with datasheet revision)
Device Type (consists of 3 or 4 digit numbers)
Prefix
ICS, AV = Standard Device
17