CDC339
CLOCK DRIVER
WITH 3-STATE OUTPUTS
SCAS331 – DECEMBER 1992 – REVISED MARCH 1994
D
D
D
D
D
D
D
Low Output Skew, Low Pulse Skew for
Clock-Distribution and Clock-Generation
Applications
TTL-Compatible Inputs and Outputs
Distributes One Clock Input to Eight
Outputs
– Four Same-Frequency Outputs
– Four Half-Frequency Outputs
Distributed V
CC
and Ground Pins Reduce
Switching Noise
High-Drive Outputs (– 48-mA I
OH
,
48-mA I
OL
)
State-of-the-Art EPIC-
ΙΙ
B
™
BiCMOS Design
Significantly Reduces Power Dissipation
Package Options Include Plastic
Small-Outline (DW) and Shrink
Small-Outline (DB) Packages
DB OR DW PACKAGE
(TOP VIEW)
Y3
GND
Y4
V
CC
OE
CLR
V
CC
Q4
GND
Q3
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
Y2
GND
Y1
V
CC
CLK
GND
V
CC
Q1
GND
Q2
description
The CDC339 is a high-performance, low-skew clock driver. It is specifically designed for applications requiring
synchronized output signals at both the primary clock frequency and one-half the primary clock frequency. The
four Y outputs switch in phase and at the same frequency as the clock (CLK) input. The four Q outputs switch
at one-half the frequency of CLK.
When the output-enable (OE) input is low and the clear (CLR) input is high, the Y outputs follow CLK and the
Q outputs toggle on low-to-high transitions of CLK. Taking CLR low asynchronously resets the Q outputs to the
low level. When OE is high, the outputs are in the high-impedance state.
The CDC339 is characterized for operation from – 40°C to 85°C.
FUNCTION TABLE
INPUTS
OE
H
L
L
L
L
CLR
X
L
L
H
H
CLK
X
L
H
L
↑
OUTPUTS
Y1–Y4
Z
L
H
L
H
Q1– Q4
Z
L
L
Q0†
Q0†
† The level of the Q outputs before the
indicated steady-state input conditions were
established.
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.
EPIC-ΙΙB is a trademark of 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.
Copyright
©
1994, Texas Instruments Incorporated
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
1
TI [ TEXAS INSTRUMENTS ]
