CDC318ADLR [TI]

具有 I2C 控制接口的 1 线路至 18 线路时钟驱动器 | DL | 48 | 0 to 70;
CDC318ADLR
型号: CDC318ADLR
厂家: TEXAS INSTRUMENTS    TEXAS INSTRUMENTS
描述:

具有 I2C 控制接口的 1 线路至 18 线路时钟驱动器 | DL | 48 | 0 to 70

时钟 驱动 时钟驱动器
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中文:  中文翻译
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CDC318A  
1-LINE TO 18-LINE CLOCK DRIVER  
2
WITH I C CONTROL INTERFACE  
SCAS614 – SEPTEMBER 1998  
DL PACKAGE  
(TOP VIEW)  
High-Speed, Low-Skew 1-to-18 Clock Buffer  
for Synchronous DRAM (SDRAM) Clock  
Buffering Applications  
1
2
3
4
5
6
7
8
9
48  
47  
46  
NC  
NC  
NC  
NC  
Output Skew, t  
, Less Than 250 ps  
sk(o)  
Pulse Skew, t  
, Less Than 500 ps  
sk(p)  
V
V
CC  
CC  
Supports up to Four Unbuffered SDRAM  
Dual Inline Memory Modules (DIMMs)  
1Y0  
1Y1  
GND  
45 4Y3  
44 4Y2  
43 GND  
2
I C Serial Interface Provides Individual  
Enable Control for Each Output  
V
42  
V
CC  
CC  
1Y2  
1Y3  
41 4Y1  
40 4Y0  
39 GND  
38 OE  
Operates at 3.3 V  
Distributed V  
Switching Noise  
and Ground Pins Reduce  
CC  
GND 10  
A
11  
12  
100-MHz Operation  
V
V
37  
36 3Y3  
CC  
CC  
ESD Protection Exceeds 2000 V Per  
MIL-STD-883, Method 3015  
2Y0 13  
2Y1  
GND  
3Y2  
GND  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
35  
34  
33  
32  
31  
30  
29  
28  
27  
26  
25  
Packaged in 48-Pin Shrink Small Outline  
(DL) Package  
V
V
CC  
CC  
2Y2  
2Y3  
GND  
3Y1  
3Y0  
GND  
description  
The CDC318A is a high-performance clock buffer  
designed to distribute high-speed clocks in PC  
applications. This device distributes one input (A)  
to 18 outputs (Y) with minimum skew for clock  
distribution. The CDC318A operates from a 3.3-V  
power supply. It is characterized for operation  
from 0°C to 70°C.  
V
V
CC  
CC  
5Y0  
GND  
5Y1  
GND  
GND  
SCLOCK  
V
CC  
SDATA  
NC – No internal connection  
This device has been designed with consideration  
foroptimizedEMIperformance. Dependingonthe  
application layout, damping resistors in series to  
the clock outputs (like proposed in the PC100  
specification) may not be needed in most cases.  
2
The device provides a standard mode (100K-bits/s) I C serial interface for device control. The implementation  
2
2
is as a slave/receiver. The device address is specified in the I C device address table. Both of the I C inputs  
(SDATA and SCLOCK) are 5-V tolerant and provide integrated pullup resistors (typically 140 k).  
2
Three 8-bit I C registers provide individual enable control for each of the outputs. All outputs default to enabled  
at powerup. Each output can be placed in a disabled mode with a low-level output when a low-level control bit  
is written to the control register. The registers are write only and must be accessed in sequential order (i.e.,  
random access of the registers is not supported).  
The CDC318A provides 3-state outputs for testing and debugging purposes. The outputs can be placed in a  
high-impedance state via the output-enable (OE) input. When OE is high, all outputs are in the operational state.  
When OE is low, the outputs are placed in a high-impedance state. OE provides an integrated pullup resistor.  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
Intel is a trademark of Intel Corporation  
Copyright 1998, Texas Instruments Incorporated  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of Texas Instruments  
standard warranty. Production processing does not necessarily include  
testing of all parameters.  
1
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
CDC318A  
1-LINE TO 18-LINE CLOCK DRIVER  
2
WITH I C CONTROL INTERFACE  
SCAS614 – SEPTEMBER 1998  
FUNCTION TABLE  
OUTPUTS  
INPUTS  
OE  
L
A
X
L
1Y0–1Y3  
2Y0–2Y3  
3Y0–3Y3  
4Y0–4Y3  
5Y0–5Y1  
Hi-Z  
L
Hi-Z  
L
Hi-Z  
L
Hi-Z  
L
Hi-Z  
L
H
H
H
H
H
H
H
H
2
The function table assumes that all outputs are enabled via the appropriate I C configuration register bit. If the output is disabled  
via the appropriate configuration bit, then the output is driven to a low state, regardless of the state of the A input.  
logic diagram (positive logic)  
38  
OE  
24  
SDATA  
2
I C  
18  
Register  
Space  
2
I C  
/
4, 5, 8, 9  
13, 14, 17, 18  
31, 32, 35, 36  
25  
11  
1Y0–1Y3  
SCLOCK  
2Y0–2Y3  
3Y0–3Y3  
4Y0–4Y3  
5Y0–5Y1  
A
40, 41, 44, 45  
21, 28  
2
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
CDC318A  
1-LINE TO 18-LINE CLOCK DRIVER  
2
WITH I C CONTROL INTERFACE  
SCAS614 – SEPTEMBER 1998  
Terminal Functions  
TERMINAL  
NO.  
I/O  
DESCRIPTION  
NAME  
1Y0–1Y3  
2Y0–2Y3  
3Y0–3Y3  
4Y0–4Y3  
5Y0–5Y1  
A
4, 5, 8, 9  
13, 14, 17, 18  
31, 32, 35, 36  
40, 41, 44, 45  
21, 28  
O
O
O
O
O
I
3.3-V SDRAM byte 0 clock outputs  
3.3-V SDRAM byte 1 clock outputs  
3.3-V SDRAM byte 2 clock outputs  
3.3-V SDRAM byte 3 clock outputs  
3.3-V clock outputs provided for feedback control of external phase-locked loops (PLLs)  
Clock input  
11  
Output enable. When asserted, OE puts all outputs in a high-impedance state. A nominal  
140-kpullup resistor is internally integrated.  
38  
25  
24  
I
I
OE  
2
I C serial clock input. A nominal 140-kpullup resistor is internally integrated.  
SCLOCK  
SDATA  
2
Bidirectional I C serial data input/output. A nominal 140-kpullup resistor is internally  
I/O  
integrated.  
6, 10, 15, 19, 22, 26,  
27, 30, 34, 39, 43  
Ground  
GND  
NC  
1, 2, 47, 48  
No internal connection. Reserved for future use.  
3.3-V power supply  
3, 7, 12, 16, 20, 23,  
29, 33, 37, 42, 46  
V
CC  
2
I C DEVICE ADDRESS  
A7  
A6  
A5  
A4  
A3  
A2  
A1  
A0 (R/W)  
H
H
L
H
L
L
H
2
I C BYTE 0-BIT DEFINITION  
BIT  
7
DEFINITION  
DEFAULT VALUE  
2Y3 enable (pin 18)  
2Y2 enable (pin 17)  
2Y1 enable (pin 14)  
2Y0 enable (pin 13)  
1Y3 enable (pin 9)  
1Y2 enable (pin 8)  
1Y1 enable (pin 5)  
1Y0 enable (pin 4)  
H
H
H
H
H
H
H
H
6
5
4
3
2
1
0
When the value of the bit is high, the output is enabled.  
When the value of the bit is low, the output is forced to a  
low state. The default value of all bits is high.  
3
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
CDC318A  
1-LINE TO 18-LINE CLOCK DRIVER  
2
WITH I C CONTROL INTERFACE  
SCAS614 – SEPTEMBER 1998  
2
I C BYTE 1-BIT DEFINITION  
BIT  
7
DEFINITION  
DEFAULT VALUE  
4Y3 enable (pin 45)  
4Y2 enable (pin 44)  
4Y1 enable (pin 41)  
4Y0 enable (pin 40)  
3Y3 enable (pin 36)  
3Y2 enable (pin 35)  
3Y1 enable (pin 32)  
3Y0 enable (pin 31)  
H
H
H
H
H
H
H
H
6
5
4
3
2
1
0
When the value of the bit is high, the output is enabled.  
When the value of the bit is low, the output is forced to a  
low state. The default value of all bits is high.  
2
I C BYTE 2-BIT DEFINITION  
BIT  
7
DEFINITION  
5Y1 enable (pin 28)  
5Y0 enable (pin 21)  
Reserved  
DEFAULT VALUE  
H
H
H
H
H
H
H
H
6
5
4
Reserved  
3
Reserved  
2
Reserved  
1
Reserved  
0
Reserved  
When the value of the bit is high, the output is enabled.  
When the value of the bit is low, the output is forced to a  
low state. The default value of all bits is high.  
4
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
CDC318A  
1-LINE TO 18-LINE CLOCK DRIVER  
2
WITH I C CONTROL INTERFACE  
SCAS614 – SEPTEMBER 1998  
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)  
Supply voltage range, V  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 4.6 V  
CC  
Input voltage range, V (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 4.6 V  
I
Input voltage range, V (SCLOCK, SDATA) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 6.5 V  
I
Output voltage range, V (SDATA) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 6.5 V  
O
Voltage range applied to any output in the high or power-off state, V  
. . . . . . . . . . . . . –0.5 V to V  
+0.5 V  
O
CC  
Current into any output in the low state (except SDATA), I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 mA  
Current into SDATA in the low state, I  
O
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 mA  
O
Input clamp current, I (V < 0) (SCLOCK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –50 mA  
IK  
I
Output clamp current, I  
(V < 0) (SDATA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –50 mA  
OK  
O
Package thermal impedance, θ (see Notes 2 and 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84°C/W  
Storage temperature range, T  
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260 C  
JA  
stg  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C  
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and  
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not  
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.  
NOTES: 1. The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed.  
2. The package thermal impedance is calculated in accordance with EIA/JEDEC Std JESD51, except for through-hole packages,  
which use a trace length of zero. The absolute maximum power dissipation allowed at T = 55°C (in still air) is 1.2 W.  
A
3. Thermal impedance (Θ ) can be considerably lower if the device is soldered on the PCB board with a copper layer underneath the  
JA  
package. A simulation on a PCB board (3 in. × 3 in.) with two internal copper planes (1 oz. cu, 0.036 mm thick) and 0.071 mm cu  
(202) in area underneath the package, resulted in Θ = 60°C/W. This would allow 1.2 W total power dissipation at TA = 70°C.  
JA  
recommended operating conditions (see Note 4)  
MIN  
3.135  
2
TYP  
MAX  
UNIT  
V
V
3.3-V core supply voltage  
High-level input voltage  
3.465  
CC  
IH  
A, OE  
V
+0.3  
V
CC  
V
SDATA, SCLOCK  
(see Note 3)  
2.2  
–0.3  
0
5.5  
V
V
V
A, OE  
0.8  
V
IL  
Low-level input voltage  
SDATA, SCLOCK  
(see Note 3)  
1.04  
I
I
High-level output current  
Low-level output current  
Y outputs  
Y outputs  
–36  
24  
mA  
mA  
OH  
OL  
SDATA, SCLOCK  
(see Note 3)  
r
i
Input resistance to V  
140  
kΩ  
CC  
f
t
t
t
t
t
t
t
t
t
t
SCLOCK frequency  
Bus free time  
100  
kHz  
µs  
µs  
µs  
µs  
µs  
ns  
ns  
ns  
ns  
µs  
°C  
(SCL)  
4.7  
4.7  
4
(BUS)  
START setup time  
START hold time  
su(START)  
h(START)  
w(SCLL)  
w(SCLH)  
r(SDATA)  
f(SDATA)  
su(SDATA)  
h(SDATA)  
su(STOP)  
SCLOCK low pulse duration  
SCLOCK high pulse duration  
SDATA input rise time  
SDATA input fall time  
SDATA setup time  
4.7  
4
1000  
300  
250  
20  
4
SDATA hold time  
STOP setup time  
T
Operating free-air temperature  
0
70  
A
NOTE 4: The CMOS-level inputs fall within these limits: V min = 0.7 × V  
IH  
and V max = 0.3 × V  
IL  
.
CC  
CC  
5
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
CDC318A  
1-LINE TO 18-LINE CLOCK DRIVER  
2
WITH I C CONTROL INTERFACE  
SCAS614 – SEPTEMBER 1998  
electrical characteristics over recommended operating free-air temperature range (unless  
otherwise noted)  
PARAMETER  
TEST CONDITIONS  
MIN  
TYP  
MAX  
UNIT  
V
Input clamp voltage  
V
V
= 3.135 V,  
I = –18 mA  
–1.2  
V
IK  
CC  
I
V
0.1 V  
CC  
= Min to Max,  
I
= –1 mA  
CC  
OH  
V
OH  
High-level output voltage  
Low-level output voltage  
Y outputs  
Y outputs  
V
V
V
CC  
V
CC  
V
CC  
= 3.135 V,  
I
I
I
I
I
= –36 mA  
= 1 mA  
2.4  
OH  
OL  
OL  
OL  
OL  
= Min to Max,  
= 3.135 V,  
0.1  
0.4  
= 24 mA  
= 3 mA  
V
OL  
0.4  
SDATA  
SDATA  
V
CC  
= 3.135 V  
= 6 mA  
0.6  
V
CC  
V
CC  
V
CC  
V
CC  
V
CC  
V
CC  
V
CC  
= 3.135 V,  
= 3.135 V,  
= 3.3 V,  
V
O
V
O
V
O
V
O
V
O
V
O
V
O
= V  
MAX  
20  
µA  
CC  
= 2 V  
54  
–126  
I
High-level output current  
OH  
Y outputs  
Y outputs  
= 1.65 V  
= 3.135 V  
= 1 V  
92  
93  
mA  
= 3.465 V,  
= 3.135 V,  
= 3.3 V,  
21  
49  
46  
118  
I
I
I
Low-level output current  
High-level input current  
Low-level input current  
= 1.65 V  
= 0.4 V  
mA  
µA  
µA  
OL  
IH  
IL  
= 3.465 V,  
24  
53  
5
A
OE  
V
= 3.465 V,  
= 3.465 V,  
V = V  
I CC  
20  
CC  
CC  
SCLOCK, SDATA  
20  
A
–5  
50  
50  
±10  
50  
OE  
V
V = GND  
I
–10  
10  
SCLOCK, SDATA  
I
I
I
High-impedance-state output current  
V
CC  
V
CC  
V
CC  
V
CC  
= 3.465 V,  
= 0,  
V = 3.465 V or 0  
O
µA  
µA  
OZ  
Off-state current  
Supply current  
SCLOCK, SDATA  
V = 0 V to 5.5 V  
I
off  
= 3.465 V,  
I
O
= 0  
0.2  
0.5  
mA  
CC  
= 3.135 V to 3.465 V,  
– 0.6 V,  
I  
CC  
Change in supply current  
One input at V  
CC  
All other inputs at V  
500  
µA  
or GND  
CC  
Dynamic I  
at 100 MHz  
V
= 3.465 V,  
C
= 20 pF,  
230  
4
mA  
pF  
pF  
CC  
CC  
V = V  
L
C
C
C
Input capacitance  
or GND,  
V
V
V
= 3.3 V  
= 3.3 V  
= 3.3 V  
I
I
CC  
= V  
CC  
CC  
Output capacitance  
SDATA I/O capacitance  
V
O
or GND,  
6
O
CC  
= V  
V
I/O  
or GND,  
7
pF  
I/O  
CC  
CC  
6
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
CDC318A  
1-LINE TO 18-LINE CLOCK DRIVER  
2
WITH I C CONTROL INTERFACE  
SCAS614 – SEPTEMBER 1998  
switching characteristics over recommended operating conditions  
PARAMETER  
FROM  
TO  
TEST CONDITIONS  
MIN  
MAX  
UNIT  
A
Y
1.2  
4.5  
ns  
t
t
t
t
Low-to-high level propagation delay time  
SDATA  
valid  
V
= 3.3 V ±0.165 V,  
PLH  
PLH  
PHL  
PHL  
CC  
SCLOCK↓  
2
µs  
See Figure 3  
V
= 3.3 V ±0.165 V,  
CC  
See Figure 3  
Low-to-high level propagation delay time  
High-to-low level propagation delay time  
High-to-low level propagation delay time  
SDATA↑  
A
Y
Y
150  
4.5  
2
ns  
ns  
µs  
1.2  
SDATA  
valid  
V
= 3.3 V ±0.165 V,  
CC  
See Figure 3  
SCLOCK↓  
V
= 3.3 V ±0.165 V,  
CC  
See Figure 3  
SDATA↑  
Y
Y
150  
ns  
ns  
t
t
t
t
t
t
t
t
Enable time to the high level  
Enable time to the low level  
Disable time from the high level  
Disable time from the low level  
Skew time  
1
1
1
1
7
7
PZH  
PZL  
PHZ  
PLZ  
sk(o)  
sk(p)  
sk(pr)  
r
OE  
7
OE  
Y
ns  
7
A
A
A
Y
Y
Y
Y
250  
500  
1
ps  
ps  
ns  
ns  
Skew time  
Skew time  
Rise time  
0.5  
6
2.2  
C
C
= 10 pF  
Rise time (see Note 5 and  
Figure 3)  
L
L
t
r
t
f
t
f
SDATA  
ns  
ns  
ns  
= 400 pF  
950  
2.3  
Fall time  
Y
0.5  
20  
C
C
= 10 pF  
Fall time (see Note 5 and  
Figure 3)  
L
L
SDATA  
= 400 pF  
250  
NOTE 5: This parameter has a lower limit than BUS specification. This allows use of series resistors for current spike protection.  
7
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
CDC318A  
1-LINE TO 18-LINE CLOCK DRIVER  
2
WITH I C CONTROL INTERFACE  
SCAS614 – SEPTEMBER 1998  
PARAMETER MEASUREMENT INFORMATION  
6 V  
S1  
TEST  
/t  
S1  
Open  
6 V  
500 Ω  
Open  
GND  
From Output  
Under Test  
t
t
t
PLH PHL  
/t  
PLZ PZL  
C
= 30 pF  
/t  
GND  
L
PHZ PZH  
500 Ω  
(see Note A)  
t
w
LOAD CIRCUIT FOR t AND t  
pd  
sk  
3 V  
0 V  
Input  
1.5 V  
1.5 V  
From Output  
Under Test  
VOLTAGE WAVEFORMS  
C
= 30 pF  
L
(see Note A)  
V
CC  
Output  
Enable  
(high-level  
enabling)  
LOAD CIRCUIT FOR t AND t  
r
f
1.5 V  
1.5 V  
0 V  
t
PZL  
3 V  
0 V  
t
PLZ  
Input  
1.5 V  
1.5 V  
3 V  
Output  
Waveform 1  
S1 at 6 V  
1.5 V  
t
PLH  
V
V
+ 0.3 V  
OL  
t
PHL  
V
OL  
OH  
(see Note B)  
t
V
V
PHZ  
OH  
2.4 V  
0.4 V  
2.4 V  
t
PZH  
Output  
1.5 V  
Output  
Waveform 2  
S1 at GND  
0.4 V  
V
OL  
– 0.3 V  
OH  
1.5 V  
t
r
t
f
(see Note B)  
0 V  
VOLTAGE WAVEFORMS  
C includes probe and jig capacitance.  
L
VOLTAGE WAVEFORMS  
NOTES: A.  
B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.  
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.  
C. All input pulses are supplied by generators having the following characteristics: PRR 10 MHz, Z = 50 , t 2.5 ns, t 2.5 ns.  
O
r
f
D. The outputs are measured one at a time with one transition per measurement.  
Figure 1. Load Circuit and Voltage Waveforms  
8
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
CDC318A  
1-LINE TO 18-LINE CLOCK DRIVER  
2
WITH I C CONTROL INTERFACE  
SCAS614 – SEPTEMBER 1998  
PARAMETER MEASUREMENT INFORMATION  
A
1Y0  
t
t
t
t
t
t
t
t
t
t
t
PHL1  
1Y1  
PLH1  
PHL2  
1Y2  
PLH2  
t
t
t
t
t
t
t
PHL3  
1Y3  
PLH3  
PLH4  
PLH5  
PLH6  
PLH7  
PLH8  
PLH9  
PHL4  
2Y0  
PHL5  
2Y1  
PHL6  
2Y2  
PHL7  
2Y3  
PHL8  
3Y0  
PHL9  
3Y1  
t
t
PLH10  
PHL10  
3Y2  
t
t
PHL11  
3Y3  
PLH11  
PLH12  
PLH13  
PLH14  
PLH15  
PLH16  
PLH17  
PLH18  
t
t
t
t
t
t
t
t
t
t
t
t
t
t
PHL12  
4Y0  
PHL13  
4Y1  
PHL14  
4Y2  
PHL15  
4Y3  
PHL16  
5Y0  
PHL17  
5Y1  
PHL18  
NOTES: A. Output skew, t , is calculated as the greater of:  
sk(o)  
– The difference between the fastest and slowest of t  
– The difference between the fastest and slowest of t  
(n = 1:18)  
(n = 1:18)  
PLHn  
PHLn  
B. Pulse skew, t  
, is calculated as the greater of |t  
– t  
| (n = 1:18)  
sk(p)  
PLHn PHLn  
, is calculated as the greater of:  
C. Process skew, t  
sk(pr)  
– Thedifferencebetweenthefastestandslowestoft  
– Thedifferencebetweenthefastestandslowestoft  
(n=1:18)acrossmultipledevicesunderidenticaloperatingconditions  
(n=1:18)acrossmultipledevicesunderidenticaloperatingconditions  
PLHn  
PHLn  
Figure 2. Waveforms for Calculation of t  
, t  
, t  
sk(o) sk(p) sk(pr)  
9
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
CDC318A  
1-LINE TO 18-LINE CLOCK DRIVER  
2
WITH I C CONTROL INTERFACE  
SCAS614 – SEPTEMBER 1998  
PARAMETER MEASUREMENT INFORMATION  
V
= 3.3 V  
O
R
= 1 kΩ  
L
DUT  
C
C
= 10 pF or  
L
= 400 pF  
L
GND  
TEST CIRCUIT  
4 to 6 Bytes for Complete Device  
Programming  
Bit 0  
LSB  
(R/W)  
Stop  
Condition  
(P)  
Start  
Condition  
(S)  
Bit 7  
MSB  
Acknowledge  
(A)  
Bit 6  
t
t
t
w(SCLH)  
su(START)  
w(SCLL)  
SCLOCK  
0.7 V  
0.3 V  
CC  
CC  
t
su(START)  
t
r
t
PHL  
t
f
t
t
PLH  
(BUS)  
0.7 V  
0.3 V  
CC  
CC  
SDATA  
t
t
r(SDATA)  
f(SDATA)  
t
t
h(SDATA)  
su(STOP)  
t
h(START)  
t
Repeat Start  
su(SDATA)  
Condition  
(see Note A)  
Stop Condition  
Start or  
Repeat Start  
Condition  
VOLTAGE WAVEFORMS  
DESCRIPTION  
BYTE  
2
I C address  
1
2
3
4
5
6
Command (dummy value, ignored)  
Byte count (dummy value, ignored)  
2
I C data byte 0  
2
I C data byte 1  
2
I C data byte 2  
NOTES: A. The repeat start condition is not supported.  
B. All input pulses are supplied by generators having the following characteristics: PRR 100 kHz, Z = 50 , t 10 ns, t 10 ns.  
O
r
f
Figure 3. Propagation Delay Times, t and t  
r
f
10  
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
CDC318A  
1-LINE TO 18-LINE CLOCK DRIVER  
2
WITH I C CONTROL INTERFACE  
SCAS614 – SEPTEMBER 1998  
MECHANICAL INFORMATION  
DL (R-PDSO-G**)  
PLASTIC SMALL-OUTLINE PACKAGE  
48 PIN SHOWN  
0.025 (0,635)  
0.012 (0,305)  
0.008 (0,203)  
0.005 (0,13)  
25  
M
48  
0.006 (0,15) NOM  
0.299 (7,59)  
0.291 (7,39)  
0.420 (10,67)  
0.395 (10,03)  
Gage Plane  
0.010 (0,25)  
0°8°  
1
24  
0.040 (1,02)  
A
0.020 (0,51)  
Seating Plane  
0.004 (0,10)  
0.008 (0,20) MIN  
PINS **  
0.110 (2,79) MAX  
28  
48  
0.630  
56  
DIM  
0.380  
(9,65)  
0.730  
A MAX  
A MIN  
(16,00) (18,54)  
0.370  
(9,40)  
0.620  
0.720  
(15,75) (18,29)  
4040048/C 03/97  
NOTES: A. All linear dimensions are in inches (millimeters).  
B. This drawing is subject to change without notice.  
C. Body dimensions do not include mold flash or protrusion not to exceed 0.006 (0,15).  
D. Falls within JEDEC MO-118  
11  
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
IMPORTANT NOTICE  
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue  
any product or service without notice, and advise customers to obtain the latest version of relevant information  
to verify, before placing orders, that information being relied on is current and complete. All products are sold  
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those  
pertaining to warranty, patent infringement, and limitation of liability.  
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in  
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent  
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily  
performed, except those mandated by government requirements.  
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF  
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL  
APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR  
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER  
CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO  
BE FULLY AT THE CUSTOMER’S RISK.  
In order to minimize risks associated with the customer’s applications, adequate design and operating  
safeguards must be provided by the customer to minimize inherent or procedural hazards.  
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent  
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other  
intellectual property right of TI covering or relating to any combination, machine, or process in which such  
semiconductor products or services might be or are used. TI’s publication of information regarding any third  
party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.  
Copyright 1998, Texas Instruments Incorporated  

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