CDC319 Datasheet, PDF (1/11 Pages) Texas Instruments – 1-LINE TO 10-LINE CLOCK DRIVER WITH I2C CONTROL INTERFACE

D High-Speed, Low-Skew 1-to-10 Clock Buffer
for SDRAM (Synchronous DRAM) Clock
Buffering Applications
D Output Skew, t_sk(o), Less Than 250 ps
D Pulse Skew, t_sk(p), Less Than 500 ps
D Supports up to Two Unbuffered SDRAM
DIMMs (Dual Inline Memory Modules)
D I²C Serial Interface Provides Individual
Enable Control for Each Output
D Operates at 3.3 V
D Distributed V_CC and Ground Pins Reduce
Switching Noise
D ESD Protection Exceeds 2000 V Per
MIL-STD-883, Method 3015
D Packaged in 28-Pin Shrink Small Outline
(DB) Package
CDC319
1-LINE TO 10-LINE CLOCK DRIVER
WITH I²C CONTROL INTERFACE
SCAS590 – DECEMBER 1997
DB PACKAGE
(TOP VIEW)
V_CC
1
1Y0
2
1Y1
3
GND
4
V_CC
5
1Y2
6
1Y3
7
GND
8
A
9
V_CC
10
3Y0
11
GND
12
V_CC
13
SDATA
14
28
V_CC
27
2Y3
26
2Y2
25
GND
24
V_CC
23
2Y1
22
2Y0
21
GND
20
OE
19
V_CC
18
3Y1
17
GND
16
GND
15
SCLOCK
description
The CDC319 is a high-performance clock buffer that distributes one input (A) to 10 outputs (Y) with minimum
skew for clock distribution. The CDC319 operates from a 3.3-V power supply, and is characterized for operation
from 0°C to 70°C.
The device provides a standard mode (100K-bits/s) I²C serial interface for device control. The implementation
is as a slave/receiver. The device address is specified in the I²C device address table. Both of the I²C inputs
(SDATA and SCLOCK) provide integrated pullup resistors (typically 140 kΩ) and are 5-V tolerant.
Three 8-bit I²C 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 CDC319 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
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.
Copyright © 1997, Texas Instruments Incorporated
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